Intelligent smoke temperature detection linkage power-off system and distribution box thereof

Abstract

The application discloses an intelligent smoke temperature detection linkage power-off system and a distribution box thereof. The distribution box is internally provided with flame-retardant sensing subareas corresponding to outgoing line loops, each flame-retardant sensing subarea is provided with a temperature node and a smoke sampling port; a controller determines branch power-off conditions and limit power-off conditions according to unique subarea identifiers and subarea loop mapping tables, in combination with temperature detection values, smoke detection values and loop currents, and drives corresponding outgoing line switches to selectively trip. After tripping, actual power-off is verified through auxiliary contacts, loop currents and load side voltages; when power-off verification fails, two or more flame-retardant sensing subareas corresponding to different outgoing line switches respectively reach the branch power-off conditions or any flame-retardant sensing subarea reaches the limit power-off condition, an independent hardware tripping assembly drives an incoming line main switch to trip. The system continues to monitor and keeps the closing lock after power-off, and can take into account selective removal of faulty loops and power-off failure escalation disposal.

Description

Technical Field

[0001] This invention relates to the field of safety monitoring and control technology for power supply or distribution boxes, specifically to an intelligent smoke and temperature detection-linked power-off system and its distribution box. Background Technology

[0002] Distribution boxes typically contain incoming switches, multiple outgoing switches, busbars, terminals, and cables. During long-term operation, loose terminals, contact oxidation, overload, insulation aging, or localized arcing can cause abnormal heating at conductive connections, further generating pyrolysis fumes. Existing distribution boxes generally use overall smoke detection, cabinet ambient temperature detection, or electrical parameter protection for alarms and power outages. However, overall detection struggles to pinpoint the specific outgoing circuit corresponding to the anomaly, easily expanding the outage area. Changes in cabinet ventilation, load temperature rise, and smoke transmission paths can also affect the stability of fixed threshold judgments. Furthermore, existing linkage controls usually use trip commands or switch auxiliary contacts as the power-off result, making it difficult to identify contact adhesion, mechanism jamming, reverse power supply, and actual uninterrupted power states caused by detected circuit anomalies. When the controller, communication link, or normal auxiliary power supply are simultaneously affected by faults, trip functions relying on the same control path may also fail. Therefore, it is necessary to establish a fixed correspondence between flame-retardant sensing zones and outgoing circuits, verify actual power outages after selective disconnection, and retain an independent main switch tripping path in case of verification failure or anomaly expansion. Summary of the Invention

[0003] This invention provides an intelligent smoke temperature detection and linkage power-off system and its distribution box to solve the problems of existing distribution boxes that make it difficult to accurately associate smoke temperature abnormalities with specific outgoing circuits, lack of actual power-off verification after selective tripping, and insufficient reliability of the main switch upgrade tripping path when the controller or normal auxiliary power supply is abnormal.

[0004] One aspect of this invention provides an intelligent smoke and temperature detection-linked power-off system, including a zoned smoke and temperature acquisition component, a controller, a branch circuit power-off and feedback component, and an independent hardware tripping component. The zoned smoke and temperature acquisition component includes a flame-retardant sensing zone with a unique zone identifier corresponding to the outgoing circuit, and temperature nodes and smoke sampling ports located in each flame-retardant sensing zone, used to output temperature detection values ​​and smoke detection values ​​associated with the unique zone identifier. The controller has a zone circuit mapping table that records the unique zone identifier and the corresponding outgoing switch number. Based on the temperature detection value, smoke detection value, and circuit current associated with the unique zone identifier, the controller determines whether the corresponding flame-retardant sensing zone has reached the branch circuit power-off condition or the ultimate power-off condition.

[0005] The branch circuit power-off condition is when the temperature and smoke detection values ​​of the same flame-retardant sensing zone reach their respective branch circuit power-off thresholds, or when the temperature detection value reaches the temperature branch circuit power-off threshold and the loop current exceeds the preset abnormal current threshold. The extreme power-off condition is when the temperature detection value reaches the extreme temperature threshold, or when the temperature and smoke detection values ​​continue to rise after the outgoing switch receives a trip command. The branch circuit power-off and feedback component drives the corresponding outgoing switch to trip when the flame-retardant sensing zone reaches the branch circuit power-off condition. It outputs a verified power-off signal only when the auxiliary contact is in the open state, the loop current is not higher than the power-off current threshold, and the load-side voltage is not higher than the power-off voltage threshold; otherwise, it outputs a power-off verification failure signal. The independent hardware tripping component is electrically isolated from the controller. It drives the incoming main switch to trip when the power-off verification failure signal is valid, two or more flame-retardant sensing zones corresponding to different outgoing switches reach the branch circuit power-off condition, or any flame-retardant sensing zone reaches the extreme power-off condition.

[0006] Specifically, the flame-retardant sensing zone is defined by flame-retardant partitions, mounting plates within the distribution box, cable tray walls, and the inner wall of the box, covering the conductive connection points of the corresponding outgoing circuit. Flame-retardant partitions are spaced apart along the arrangement direction of the outgoing switches, forming a maintenance passage between the partition near the box door and the door itself. The flame-retardant partitions restrict the lateral diffusion of smoke between adjacent flame-retardant sensing zones. Temperature nodes are located near the conductive connection points, and smoke sampling ports are positioned at the hot air convergence point above the flame-retardant sensing zone, ensuring that smoke generated at the conductive connection points preferentially enters the corresponding smoke sampling port. A unique zone identifier is fixedly set in the corresponding flame-retardant sensing zone. When two or more flame-retardant sensing zones are set for the same outgoing circuit, each unique zone identifier is associated with the outgoing switch number of that outgoing circuit.

[0007] Furthermore, the zoned smoke and temperature acquisition component also includes sampling branch pipes, smoke detection chambers, a common sampling pipe, an extraction unit, and a flow detection device. Each smoke sampling port is connected in series with a smoke detection chamber via a sampling branch pipe. The outlets of all smoke detection chambers converge at the common sampling pipe, which is connected to the extraction unit. Each sampling branch pipe is equipped with a fixed throttling device and a check valve. The length, inner diameter, and flow cross-section of the fixed throttling device of the sampling branch pipes are set to ensure that the sampling flow rate of each sampling branch pipe is within the same preset sampling flow rate range. The check valve prevents the smoke in the common sampling pipe from flowing back into the flame-retardant sensing zone after the extraction unit stops. The output of each smoke detection chamber is associated with a corresponding unique zone identifier. The flow detection device sends the sampling flow rate of each sampling branch pipe to the controller. When the sampling flow rate of a sampling branch pipe exceeds the preset sampling flow rate range, the controller outputs the corresponding unique zone identifier and a sampling channel maintenance alarm. The maintenance alarm is prevented from triggering the outgoing switch to trip when the branch power-off condition of the flame-retardant sensing zone is not met.

[0008] Furthermore, the controller includes a baseline storage unit, a smoke and temperature correction unit, and a power outage condition determination unit. The baseline storage unit stores temperature reference values ​​and smoke baselines according to load range and ventilation status during historical periods when the outgoing circuit is operating normally, the sampled flow rate is within a preset sampling flow rate range, and there are no fire alarms. The smoke and temperature correction unit, based on the correspondence between the current current of the corresponding outgoing circuit and the current and temperature rise calibrated during normal operation, subtracts the temperature rise caused by normal load from the current temperature detection value of the corresponding flame-retardant sensing zone, and corrects the smoke detection value of the flame-retardant sensing zone according to the current ventilation status by selecting the corresponding smoke baseline. The power outage condition determination unit determines whether the corresponding flame-retardant sensing zone has reached the warning condition, branch power outage condition, or extreme power outage condition based on the corrected temperature detection value, smoke detection value, corresponding circuit current, and the changing trends of temperature and smoke detection values ​​after tripping. If historical data matching the current load range and ventilation status is insufficient, the controller outputs a baseline insufficiency flag and prohibits the baseline insufficiency flag from triggering a trip independently.

[0009] Furthermore, the warning condition is that the corrected temperature or smoke detection value reaches the corresponding warning threshold within a preset number of consecutive samplings. The branch power failure condition is that the corrected temperature and smoke detection values ​​of the same flame-retardant sensing zone reach the corresponding branch power failure threshold within a preset association time, or the corrected temperature detection value reaches the temperature branch power failure threshold and the current of the corresponding outgoing circuit exceeds the preset abnormal current threshold. The extreme power failure condition is that the temperature detection value reaches the extreme temperature threshold, or after the outgoing switch receives a trip command, the temperature and smoke detection values ​​of the corresponding flame-retardant sensing zone continue to rise within a preset observation time. When a flame-retardant sensing zone reaches the warning condition, the controller outputs a unique zone identifier, the corresponding outgoing switch number, and temperature or smoke warning information and increases the sampling frequency. When it reaches the branch power failure condition, it only drives the outgoing switch indicated by the zone circuit mapping table. When two or more flame-retardant sensing zones are associated with the same outgoing switch, the controller merges them into one branch power failure event, and the remaining outgoing circuits remain powered.

[0010] Furthermore, the branch power-off and feedback component includes a branch trip driver connected to each outgoing switch, auxiliary contacts connected to the mechanical opening and closing mechanism of each outgoing switch, current sensors installed in each outgoing circuit, and an isolation voltage sampling circuit installed on the load side of each outgoing switch. The controller sets a power-off verification time window from the moment the trip command is issued, continuously reading the corresponding auxiliary contact status, circuit current, and load-side voltage. When the auxiliary contacts remain open within the power-off verification time window, the circuit current is not higher than the power-off current threshold, and the load-side voltage is not higher than the power-off voltage threshold, the branch power-off and feedback component outputs a verified power-off signal. If any of the aforementioned verification conditions are not met, the branch power-off and feedback component outputs a power-off verification failure signal and generates a verification failure record containing a unique partition identifier, the time the trip command was issued, and the verification conditions not met.

[0011] Furthermore, the independent hardware tripping component includes a temperature comparator, a linkage tripping input circuit, a verification failure input circuit, a logic trigger circuit, a latching circuit, and a main switch tripping driver. The temperature comparator outputs a limit temperature signal when the detected temperature value at any temperature node reaches the limit temperature threshold. The controller outputs a main switch tripping signal to the linkage tripping input circuit when two or more flame-retardant sensing zones corresponding to different outgoing switches reach branch power-off conditions, or when any flame-retardant sensing zone reaches the limit power-off condition. The verification failure input circuit receives a power-off verification failure signal. The logic trigger circuit drives the main switch tripping driver via the latching circuit based on any of the aforementioned signals.

[0012] Furthermore, the system also includes an energy storage power supply component and an event recording and reset control component. The energy storage power supply component is charged through an isolated charging circuit and supplies power to the independent hardware tripping component, the zone smoke and temperature acquisition component, and the event recording and reset control component after the distribution box is powered off. The controller periodically checks the terminal voltage and discharge capacity of the energy storage power supply component. If the detection results are insufficient to complete the main switch trip and post-power-off monitoring, an energy storage maintenance alarm is output. The event recording and reset control component only releases the closing interlock when the temperature and smoke detection values ​​of each flame-retardant sensing zone are lower than the corresponding reset threshold, the load-side voltage of each outgoing switch is not higher than the maintenance allowable voltage threshold, and a manual reset signal is received on-site.

[0013] Another aspect of the present invention provides a distribution box, including a box body, a mounting plate, an incoming main switch, a busbar, multiple outgoing switches, a flame-retardant partition, a temperature node, a flue gas sampling component, a controller, a branch circuit power-off and feedback component, and an independent hardware tripping component. The incoming main switch, busbar, and outgoing switches are sequentially connected and installed on the mounting plate. The flame-retardant partition, together with the mounting plate, the cable tray wall, and the inner wall of the box, forms a flame-retardant sensing zone corresponding to the outgoing circuit. Each flame-retardant sensing zone has a unique zone identifier. A temperature node is located near the conductive connection part within the flame-retardant sensing zone, and a flue gas sampling port is located at the hot airflow convergence position above it. Each outgoing switch has auxiliary contacts, and each outgoing circuit has a current sampling terminal and a load-side voltage sampling terminal.

[0014] The controller in the distribution box is equipped with a zone circuit mapping table, which records the unique zone identifier, outgoing switch number, auxiliary contact address, current sampling terminal address, and load-side voltage sampling terminal address. The controller determines whether each flame-retardant sensing zone has reached the branch circuit de-energization condition or the ultimate de-energization condition based on the temperature detection value output by the temperature node, the smoke detection value output by the smoke sampling component, and the circuit current. The branch circuit de-energization and feedback component drives the corresponding outgoing switch to trip. A verified de-energization signal is output only when the auxiliary contact is in the open state and both the circuit current and the load-side voltage are not higher than the corresponding de-energization threshold; otherwise, a de-energization verification failure signal is output. An independent hardware tripping component is located in a safety control area isolated from the busbar and outgoing switches, and is connected to the tripping driver of the incoming main switch. When the de-energization verification failure signal is valid, two or more flame-retardant sensing zones corresponding to different outgoing switches have reached the branch circuit de-energization condition, or any flame-retardant sensing zone has reached the ultimate de-energization condition, the independent hardware tripping component drives the incoming main switch to trip.

[0015] Furthermore, flame-retardant partitions are spaced apart along the arrangement direction of the outgoing switches. The smoke sampling assembly includes sampling branch pipes, smoke detection chambers connected in series with the sampling branch pipes, a common sampling pipe, an extraction unit, and a flow detection device. The outlets of each smoke detection chamber are connected to the common sampling pipe, which is connected to the extraction unit. Each sampling branch pipe is equipped with a fixed throttling device and a check valve, and is configured to keep the sampling flow rate within a preset sampling flow rate range. Each smoke detection chamber sends a smoke detection value containing a corresponding unique zone identifier to the controller, and the flow detection device sends the sampling flow rate of each sampling branch pipe to the controller. The sampling branch pipes maintain an insulating distance from exposed conductive parts. The extraction unit, controller, independent hardware tripping assembly, and energy storage power supply assembly are installed in the safety control area, and a flame-retardant partition is provided between the safety control area and the primary power distribution area. The sampling branch pipes, temperature node detection lines, and smoke detection chamber signal lines enter the safety control area through the flame-retardant sealed wiring section on the flame-retardant partition. The energy storage power supply component supplies power to the air extraction unit, independent hardware tripping component, and controller after the power distribution box is de-energized.

[0016] Furthermore, the distribution box also includes an event recording and reset control component, a ventilation execution component, and a communication interface. The event recording and reset control component includes a non-volatile memory, an energy storage status detection circuit, a field reset input, and a reset interlock output. The energy storage status detection circuit is connected to the energy storage power supply component. The non-volatile memory is used to record unique zone identifiers, temperature detection values, smoke detection values, loop current, load-side voltage, trip commands, and power outage verification results. When the temperature or smoke detection value of any flame-retardant sensing zone is not lower than the corresponding reset threshold, the temperature detection value of any flame-retardant sensing zone does not show a downward trend, the load-side voltage is higher than the maintenance allowable voltage threshold, or no field manual reset signal is received, the reset interlock output locks the closing control circuit of the incoming main switch and the outgoing switch. The ventilation actuator includes a cooling fan and controlled vents. When the temperature and smoke detection values ​​in the same flame-retardant sensing zone reach their respective branch power-off thresholds, the controller stops the cooling fan and closes the controlled vents. Simultaneously, the extraction unit continues to operate under energy storage power at a monitoring flow rate lower than the sampling flow rate before the branch power-off but not lower than the minimum detection flow rate of the smoke detection chamber. The communication interface is used to send alarms and event logs to external monitoring equipment and is electrically isolated from the independent hardware tripping component.

[0017] In summary, this invention establishes a fixed association between temperature nodes and smoke sampling ports at conductive connection points and corresponding outgoing switches through flame-retardant sensing zones, unique zone identifiers, and zone circuit mapping tables. The controller uses temperature detection values, smoke detection values, and circuit current to form graded power-off conditions. First, it selectively trips outgoing circuits that meet the branch power-off conditions, and then verifies the actual power-off using auxiliary contacts, circuit current, and load-side voltage. If the power-off verification fails, two or more flame-retardant sensing zones corresponding to different outgoing switches meet the branch power-off conditions, or any flame-retardant sensing zone meets the ultimate power-off conditions, an electrically isolated independent hardware tripping component drives the incoming main switch to trip, and the energy storage power supply component maintains post-power-off monitoring, event recording, and reset interlocking.

[0018] The above technical solution enables smoke temperature anomalies to be located along the flame-retardant sensing zone, unique zone identifier, and outgoing switch number to the corresponding outgoing circuit. It also reduces the impact of installation location, circuit load, and ventilation changes on the judgment results through sampling flow constraints, load temperature rise correction, and smoke baseline correction under ventilation conditions. When a single outgoing circuit reaches the branch power-off condition, only the outgoing switch associated with that event is disconnected, thus preventing unrelated outgoing circuits from simultaneously losing power due to local anomalies.

[0019] The above technical solution also utilizes auxiliary contacts, circuit current, and load-side voltage to jointly confirm the actual power outage, transforming the non-power-out state caused by contact adhesion, mechanism jamming, reverse power supply, or invalid feedback channels into a power outage verification failure signal; the independent hardware tripping component completes the tripping of the main incoming switch when the power outage verification fails, two or more flame-retardant sensing zones corresponding to different outgoing switches reach the branch power outage condition, or any flame-retardant sensing zone reaches the extreme power outage condition, and the energy storage power supply component maintains the necessary post-power outage monitoring and latching, thus retaining the upgrade power outage and reset lockout capabilities when the normal auxiliary power supply disappears or the control path is abnormal. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the intelligent smoke temperature detection and linkage power-off system of the present invention.

[0021] Figure 2 This is a flowchart illustrating the workflow of the intelligent smoke temperature detection and linkage power-off system of the present invention.

[0022] Figure 3 This is a schematic diagram of the internal structure of the distribution box of the present invention.

[0023] Figure 4 This is a schematic diagram of the sampling flow balance structure of the flue gas sampling component of the present invention.

[0024] Figure 5 This is a schematic diagram illustrating the tripping relationship between power outage verification and independent hardware upgrade in this invention.

[0025] Figure 6 This is a schematic diagram illustrating the application scenario of the present invention in low-voltage power distribution in industrial plants. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that the following specific embodiments are used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention; in the absence of conflict, the technical features in the following specific embodiments can be combined with each other.

[0027] Example 1 This embodiment combines Figure 1 and Figure 2 This document describes the overall composition of an intelligent smoke and temperature detection-linked power-off system, the connections between its components, and the system's workflow for smoke and temperature detection, circuit location, selective power-off, power-off result verification, and escalation of power-off. This embodiment is applicable to low-voltage distribution boxes with one incoming circuit and multiple outgoing circuits, as well as distribution cabinets, power distribution boxes, or complete switchgear where multiple outgoing circuits are divided into several individually disconnectable units.

[0028] like Figure 1As shown, the intelligent smoke temperature detection and linkage power-off system includes a zoned smoke temperature acquisition component, a controller 50, a branch power-off and feedback component, an independent hardware tripping component 70, an energy storage power supply component 80, and an event recording and reset control component 81. The zoned smoke temperature acquisition component, controller 50, and branch power-off and feedback component constitute the zone identification and selective power-off path under normal operating conditions. The independent hardware tripping component 70 constitutes an upgraded power-off path used when branch power-off verification fails, two or more flame-retardant sensing zones 30 corresponding to different outgoing switches 22 reach the branch power-off condition, or any flame-retardant sensing zone 30 reaches the extreme power-off condition. The energy storage power supply component 80 maintains smoke temperature monitoring, hardware tripping, and event recording after the normal auxiliary power supply to the distribution box disappears. The event recording and reset control component 81 is used to save detection data, control commands, and verification results before and after the anomaly occurs, and blocks the closing control circuit of the incoming main switch 20 and the outgoing switch 22 when the reset condition is not met.

[0029] Figure 1 In the process, the zoned smoke and temperature acquisition component outputs temperature detection value, smoke detection value and sampling flow rate with unique zone identifier to the controller 50. The controller 50 outputs the corresponding outgoing switch 22 trip command to the branch power-off and feedback component according to the zoned loop mapping table 51. The branch power-off and feedback component returns the verification results of auxiliary contact status, loop current and load side voltage to the controller 50. The controller 50 sends the event data to the event recording and reset control component 81. Figure 1 The multi-zone or extreme power outage conditions shown are a graphical abbreviation for upgraded power outage conditions. Specifically, it refers to two or more flame-retardant sensing zones 30 corresponding to different outgoing switches 22 reaching the branch power outage condition, or any flame-retardant sensing zone 30 reaching the extreme power outage condition. Figure 1 Solid arrows indicate the direction of transmission of sampling, control, or tripping signals, while dashed arrows indicate backup power supply, isolated communication, or closing interlocking relationships. The tripping circuit from the independent hardware tripping component 70 to the incoming main switch 20 does not pass through the event recording and reset control component 81.

[0030] Multiple flame-retardant sensing zones 30 are set up inside the distribution box according to the outgoing circuits. Each flame-retardant sensing zone 30 covers the terminals, copper busbar joints, cable crimps, or other conductive connections that need to be monitored of the corresponding outgoing switch 22, and restricts the lateral diffusion of local hot air and smoke to adjacent flame-retardant sensing zones through flame-retardant partitions 31. The flame-retardant sensing zone 30 does not need to form an airtight chamber; its structure only needs to ensure that the hot air and smoke generated by the conductive connections within the zone preferentially reach the temperature node 32 and smoke sampling port 33 of the zone. A maintenance passage is left between the side of the flame-retardant partition 31 near the box door and the box door, allowing maintenance personnel to access the outgoing switch 22 and its terminals without removing all the flame-retardant partitions 31.

[0031] Each flame-retardant sensing zone 30 is assigned a unique zone identifier. This unique identifier can be a pre-written numerical number on the controller 50, or a machine-readable identifier fixed to the flame-retardant partition 31, temperature node 32, or smoke sampling branch pipe. The unique zone identifier is used to establish a definite correspondence between the smoke and temperature detection results within the physical space and the outgoing circuit; it is not itself used as a fire detection parameter. If only one flame-retardant sensing zone 30 is set up for an outgoing circuit, the unique zone identifier is directly associated with the number of the corresponding outgoing switch 22. If flame-retardant sensing zones 30 are set up at the incoming end, outgoing end, or different phase conductive connection points of an outgoing circuit, each unique zone identifier is associated with the number of the same outgoing switch 22.

[0032] The controller 50 contains a zone circuit mapping table 51. The zone circuit mapping table 51 records at least the unique zone identifier, corresponding outgoing switch number, temperature node address, smoke detection chamber address, branch trip driver address, auxiliary contact address, current sampling terminal address, and load-side voltage sampling terminal address. The mapping table can be written during the factory configuration of the distribution box, or configured item by item by the commissioning terminal after on-site wiring is completed. After configuration, the controller 50 verifies the mapping relationship by reading a temperature node 32, driving the corresponding outgoing switch 22 to perform test actions, and reading changes in the auxiliary contact 61. To avoid the test actions affecting the load, on-site verification can be performed when the outgoing circuit is not in operation and the load side is confirmed to be de-energized. The controller 50 saves the verification information in the mapping table. If the mapping table content is modified or the verification information is inconsistent, a configuration fault is output, and the automatic branch tripping that depends on the incorrect mapping relationship is stopped. The extreme temperature input and main switch tripping function of the independent hardware tripping component 70 are not affected by this configuration fault.

[0033] Temperature node 32 is located adjacent to the conductive connection point within the corresponding flame-retardant sensing zone 30, and is used to output temperature detection values ​​with a unique zone identifier. Temperature node 32 can be a contact temperature sensor, an infrared temperature sensor, or a fiber optic temperature sensor. When using a contact temperature sensor, the sensing part can be fixed to a predetermined temperature measurement position on the outside of the conductor insulation layer, near the terminal, or on the switch housing, so that it can reflect the temperature rise of the conductive connection point without changing the creepage distance and clearance of the primary conductor. Smoke sampling port 33 is located at the upper hot airflow convergence position of the corresponding flame-retardant sensing zone 30 and is connected to smoke detection chamber 43 through sampling branch pipe 40. The detection output of smoke detection chamber 43 is associated with the corresponding unique zone identifier, so the temperature detection value and smoke detection value received by controller 50 can be traced back to the specific flame-retardant sensing zone 30.

[0034] The branch circuit de-energization and feedback assembly includes a branch circuit trip driver 60, an auxiliary contact 61, a current sensor 62, and an isolation voltage sampling circuit 63. The branch circuit trip driver 60 is connected to the shunt trip unit, undervoltage trip unit, electric operating mechanism, or contactor located in the outgoing circuit of the outgoing switch 22. The auxiliary contact 61 is connected to the mechanical opening and closing mechanism of the outgoing switch 22 to reflect the position of the switch mechanism; the current sensor 62 is located in the outgoing circuit to determine whether current still flows after tripping; the isolation voltage sampling circuit 63 is connected to the load side of the outgoing switch 22 to determine whether voltage still exists on the load side due to contact sticking, bypass connection, or reverse current feeding. The auxiliary contact 61, the circuit current, and the load-side voltage reflect the mechanical state, the conductive state, and the energized state of the load side, respectively, and all three are used together to determine whether the outgoing circuit has completed the actual de-energization.

[0035] The independent hardware trip component 70 is electrically isolated from the controller 50. It includes a temperature comparator 71, a trip-linkage input circuit 72, a verification failure input circuit 73, a logic trigger circuit 74, a latch circuit 75, and a main switch trip driver 76. The temperature comparator 71 directly receives the extreme temperature detection channel from the temperature node 32. The trip-linkage input circuit 72 receives the main switch trip signal output by the controller 50. The verification failure input circuit 73 receives the power failure verification signal output by the branch power-off and feedback components. When any of the above signals is valid, the logic trigger circuit 74 keeps the latch circuit 75 in a triggered state, and the main switch trip driver 76 drives the incoming main switch 20 to trip. When the controller 50 experiences a program stop, communication interruption, or reset, the temperature comparator 71, the verification failure input circuit 73, the latch circuit 75, and the main switch trip driver 76 maintain their hardware connection.

[0036] like Figure 2 As shown, the system operation process in this embodiment includes the following steps. Figure 2 When a single zone reaches the branch power outage condition, it means that only one branch power outage event is formed corresponding to one outgoing switch 22; when two or more flame-retardant sensing zones 30 associated with the same outgoing switch 22 simultaneously reach the branch power outage condition, they are still merged into one branch power outage event. Figure 2 The multiple zones or extreme conditions refer to two or more flame-retardant sensing zones 30 corresponding to different outgoing switches 22 reaching the branch power-off condition, or any flame-retardant sensing zone 30 reaching the extreme power-off condition. Figure 2 The term "no dangerous voltage on the load side" means that the load side voltage is not higher than the power-off voltage threshold. When all three conditions are met simultaneously, the branch enters the power-off verification successful branch. If any one of these conditions is not met or the signal is invalid, the branch enters the power-off verification failed branch.

[0037] Step S1: The system performs a power-on self-test and configuration verification. Controller 50 reads the partition circuit mapping table 51, checking the unique partition identifier, outgoing switch number, and sampling address for completeness. It also reads the initial states of temperature node 32, smoke detection chamber 43, flow detection element 46, auxiliary contact 61, current sensor 62, and isolation voltage sampling circuit 63, and checks the terminal voltage and discharge capacity of energy storage power supply component 80. The extraction unit 45 operates briefly, and controller 50 determines whether the sampling flow rate of each sampling branch pipe 40 falls within the preset sampling flow rate range. If the flow rate of a sampling branch pipe 40 is outside the preset sampling flow rate range, controller 50 outputs a sampling channel maintenance alarm containing the unique partition identifier. This maintenance alarm does not trigger outgoing switch 22 to trip independently if the corresponding flame-retardant sensing partition 30 does not meet the branch power-off condition.

[0038] In step S1, the controller 50 also checks whether the auxiliary contact status of the main incoming switch 20 and each outgoing switch 22 matches the current and voltage detection results. For example, if the auxiliary contact indicates that the outgoing switch 22 is in the open state, but the corresponding circuit still detects a current exceeding the power-off current threshold or a load-side voltage exceeding the power-off voltage threshold, the controller 50 records this state as a switch feedback anomaly. The switch feedback anomaly is output as maintenance information during normal operation; when the system has issued a trip command to the outgoing switch 22, the same state is treated as a power-off verification failure. Thus, the same detection result is used for daily self-inspection and post-trip safety verification according to its occurrence sequence.

[0039] Step S2: The system establishes a normal operating baseline and performs zoned data acquisition. During periods when no fire alarm occurs in the outgoing circuit, the sampled flow rate is within the preset sampled flow rate range, and the sensor status is valid, the controller 50 saves temperature reference values ​​and smoke baselines according to the load zone and distribution box ventilation status of the corresponding outgoing circuit. The load zone can be divided into several consecutive segments based on the rated current, and the ventilation status should at least distinguish between the cooling fan being stopped, the cooling fan running, and the controlled ventilation opening being closed. In subsequent operation, the controller 50 periodically acquires the temperature and smoke detection values ​​of each flame-retardant sensing zone 30, and simultaneously reads the current of the corresponding outgoing circuit, the auxiliary contact status of the outgoing switch 22, and the load-side voltage.

[0040] When establishing a baseline, data during early warning, branch power outage, or extreme power outage processes are not used, nor is smoke data during sampling channel maintenance alarm periods, nor is transient data that has not yet stabilized after switch operation. If historical data matching the current load range and ventilation status is insufficient, the controller 50 outputs a baseline insufficiency flag, using factory reference values ​​or conservative reference values ​​from adjacent load ranges to maintain monitoring. However, the baseline insufficiency flag itself does not trigger the tripping of the outgoing switch 22 or the incoming main switch 20. Once subsequent valid data reaches a predetermined amount, the controller 50 updates the reference values ​​for the corresponding load range and ventilation status and removes the baseline insufficiency flag.

[0041] In step S3, the controller 50 performs operational status correction on the temperature and smoke detection values. For the temperature detection value, the controller 50 identifies the expected temperature rise caused by normal load based on the current loop current and the current-temperature rise correspondence calibrated during normal operation, and separates the portion of the temperature rise exceeding the normal load from the current temperature change. For the smoke detection value, the controller 50 selects the appropriate smoke baseline based on the current status of the cooling fan and controlled vents to reduce the impact of changes in ventilation status, slow accumulation of ambient dust, or slow changes in the sensor zero point. The correction process retains the original detection values, which are used for extreme temperature hardware comparison and event tracing, while the corrected detection values ​​are used to determine early warning conditions and branch power failure conditions.

[0042] In step S4, the controller 50 determines the warning condition, branch power failure condition, and extreme power failure condition. The warning condition is that the corrected temperature detection value or the corrected smoke detection value reaches the corresponding warning threshold in a preset number of consecutive samplings. When the warning condition is met, the controller 50 outputs a unique zone identifier, the corresponding outgoing switch number, and temperature or smoke warning information, increases the sampling frequency of the flame-retardant sensing zone 30, and begins to save continuous data before and after the warning. A single temperature warning or a single smoke warning is not directly equivalent to a branch power failure condition, thus reserving time for verification of transient changes caused by load changes, short-term dust, or external smoke.

[0043] The branch power outage conditions are determined using either a smoke-temperature correlation or a temperature-abnormal current correlation method. The first branch power outage condition occurs when the corrected temperature detection value and the corrected smoke detection value in the same flame-retardant sensing zone 30 reach their respective branch power outage thresholds within a preset correlation time. This preset correlation time allows for a transmission delay between temperature rise and smoke arrival at the smoke detection chamber 43, but does not merge two unrelated exceedances that are too far apart into the same power outage event. The second branch power outage condition occurs when the corrected temperature detection value reaches the temperature branch power outage threshold, and the current in the corresponding outgoing circuit exceeds a preset abnormal current threshold. If either of these two branch power outage conditions is met, the selective branch power outage process can be initiated.

[0044] The extreme power outage condition is that the original temperature detection value output by any temperature node 32 reaches the extreme temperature threshold, or after the outgoing switch 22 receives a trip command, the temperature detection value and smoke detection value of the corresponding flame-retardant sensing zone 30 continue to rise within a preset observation time. The extreme temperature threshold is higher than the temperature branch power outage threshold, and the temperature comparator 71 retains an independent hardware judgment path. If the smoke temperature continues to rise after the trip, it indicates that the branch power outage failed to prevent the heat source from developing, the abnormality is maintained by other power supply paths, or the fire has moved out of the control range of a single branch, so it no longer waits for the normal branch to be dealt with.

[0045] In step S5, if a flame-retardant sensing zone 30 reaches the branch power-off condition, and no more than two flame-retardant sensing zones 30 corresponding to different outgoing switches 22 have reached the branch power-off condition or any flame-retardant sensing zone 30 has reached the extreme power-off condition, the controller 50 reads the unique zone identifier of the flame-retardant sensing zone 30, obtains the corresponding outgoing switch number and branch trip driver address from the zone circuit mapping table 51, and outputs a trip command to the branch trip driver 60. The branch trip driver 60 drives the corresponding outgoing switch 22 to trip, and the remaining outgoing circuits not associated with this branch power-off event maintain their original power supply status. When an outgoing circuit is equipped with two or more flame-retardant sensing zones 30, as long as one of the flame-retardant sensing zones 30 reaches the branch power-off condition, the controller 50 will merge the zone information associated with the same outgoing switch number into one branch power-off event to avoid repeatedly outputting overlapping trip commands to the same outgoing switch 22.

[0046] While executing step S5, controller 50 stops the cooling fan and closes the controlled ventilation opening to reduce the diffusion of smoke outside the enclosure and the continuous entry of outside air into the abnormal area. The extraction unit 45 does not stop immediately, but, with the support of the energy storage power supply component 80, switches to a monitoring flow rate lower than the sampling flow rate before the branch power failure and not lower than the minimum detection flow rate of the smoke detection chamber 43, to continue acquiring smoke changes after the power failure. The ventilation execution action, sampling flow rate switching, and branch tripping use independent output interfaces; failure of the ventilation execution component does not block the branch tripping command.

[0047] Step S6: From the moment the trip command is issued, the controller 50 sets a power-off verification time window and continuously reads the auxiliary contact 61, the circuit current, and the load-side voltage within this time window. The branch power-off and feedback component only outputs a verified power-off signal when the auxiliary contact 61 remains open, the circuit current is not higher than the power-off current threshold, and the load-side voltage is not higher than the power-off voltage threshold. If any of the three verification conditions is not met, the branch power-off and feedback component outputs a power-off verification failure signal. The event logging and reset control component 81 stores the unique partition identifier, outgoing switch number, the moment the trip command was issued, the power-off verification time window, the three verification results, and the verification conditions that were not met.

[0048] When auxiliary contact 61 is in the open state but the circuit current is still higher than the power-off current threshold, there may be a false indication of the auxiliary contact, bypass conduction, or abnormal wiring of the detection circuit. When auxiliary contact 61 is in the open state and the circuit current decreases, but the load-side voltage is still higher than the power-off voltage threshold, there may be reverse power feeding or other power coupling. When auxiliary contact 61 does not switch to the open state, there may be a failure of the trip drive or jamming of the switching mechanism. The system does not need to distinguish the above causes during the emergency handling phase. As long as any verification condition is not met, the system will proceed to the upgraded power-off process as if the power-off verification has failed, and the specific conditions that were not met will be left for maintenance personnel to analyze.

[0049] In step S7, the independent hardware trip component 70 trips the incoming main switch 20 based on the upgrade power-off input. The upgrade power-off input includes a power-off verification failure signal, a main switch trip signal generated when two or more flame-retardant sensing zones 30 corresponding to different outgoing switches 22 reach branch power-off conditions, and a main switch trip signal or extreme temperature signal generated when any flame-retardant sensing zone 30 reaches extreme power-off conditions. The verification failure input circuit 73 isolates and shapes the power-off verification failure signal, the linkage trip input circuit 72 receives the main switch trip signal output by the controller 50, and the temperature comparator 71 directly outputs the extreme temperature signal. Upon receiving any valid input, the logic trigger circuit 74 triggers the latch circuit 75, and the main switch trip driver 76 obtains sufficient electrical energy to drive the incoming main switch 20 to trip in the latched state. Even if the trigger signal subsequently disappears, the latch circuit 75 maintains the main switch tripped and locked state until the on-site manual reset conditions are met.

[0050] In step S8, after the branch power-off verification is passed or the main incoming switch 20 completes tripping, the system enters the post-power-off monitoring process. The energy storage power supply component 80 supplies power to the temperature node 32, smoke detection chamber 43, extraction unit 45, controller 50, independent hardware tripping component 70, and event recording and reset control component 81. The controller 50 continues to collect temperature and smoke detection values ​​from each flame-retardant sensing zone 30 and records whether the temperature has decreased, whether the smoke has dissipated, and whether the load-side voltage has dropped to the maintenance allowable range. The communication interface 86 can send alarms and event records to the external monitoring device 87, but the communication interface 86 is electrically isolated from the independent hardware tripping component 70, and communication interruption does not affect the already established tripping and locking states.

[0051] The event recording and reset control component 81 continuously blocks the closing control circuits of the incoming main switch 20 and the outgoing switch 22 when the temperature or smoke detection value of any flame-retardant sensing zone 30 is not lower than the corresponding reset threshold, the temperature detection value of any flame-retardant sensing zone 30 does not show a downward trend, the voltage on any load side is higher than the maintenance allowable voltage threshold, or no manual reset signal is received on site. Only when the temperature and smoke detection values ​​of each flame-retardant sensing zone 30 are lower than the corresponding reset threshold, the temperature shows a downward trend, the voltage on each load side is not higher than the maintenance allowable voltage threshold, and the maintenance personnel input a manual reset signal after completing the on-site inspection, will the event recording and reset control component 81 release the closing lockout. Releasing the lockout only indicates that subsequent power supply operations are permitted; it does not automatically drive the closing of the incoming main switch 20 or the outgoing switch 22.

[0052] Through the above composition and working process, the system establishes a continuous correspondence between the physical location, unique zone identifier, outgoing switch number, and power failure feedback sampling terminal of the flame-retardant sensing zone 30. When a single flame-retardant sensing zone 30 reaches the branch power failure condition, the system can first cut off the corresponding outgoing circuit and retain other outgoing circuits; when the branch power failure cannot be jointly confirmed by the auxiliary contact 61, the circuit current, and the load-side voltage, or when two or more flame-retardant sensing zones 30 corresponding to different outgoing switches 22 reach the branch power failure condition, or when any flame-retardant sensing zone 30 reaches the ultimate power failure condition, the independent hardware tripping component 70 upgrades and drives the incoming main switch 20 to trip. This working process does not require normal external communication or continuous operation of the main control program as a necessary condition for completing the tripping of the main switch, and continues to retain smoke temperature monitoring, event recording, and on-site reset interlocking after power failure.

[0053] Example 2 This embodiment combines Figure 4 This embodiment describes the specific structure of the flue gas sampling component, the flow balancing method of each sampling channel, the identification method of sampling anomalies, and the process by which the controller 50 establishes and uses temperature reference values ​​and smoke baselines based on the load range and ventilation status. Based on the system composition described in Embodiment 1, this embodiment further explains the baseline storage unit 52, smoke temperature correction unit 53, and power failure condition determination unit 54 in the zoned smoke temperature acquisition component and controller 50.

[0054] like Figure 4As shown, the distribution box is equipped with three flame-retardant sensing zones 30, distinguished by unique zone identifiers Z1, Z2, and Z3. The number of flame-retardant sensing zones 30 is not limited to three; the actual number can be determined based on the number of outgoing circuits and the number of conductive connections to be monitored. Each flame-retardant sensing zone 30 has a smoke sampling port 33 at its upper part, which is connected to the inlet of the corresponding sampling branch pipe 40. The sampling branch pipe 40 is arranged along the inner wall of the distribution box, the back side of the mounting plate, or the dedicated insulated conduit area, and maintains an insulation distance from exposed conductive parts that meets the requirements of the corresponding voltage level. When the sampling branch pipe 40 passes through the flame-retardant isolation plate 15, it enters the safety control area 14 through the flame-retardant sealed wiring part 16, thereby enabling the smoke detection chamber 43, the common sampling pipe 44, and the extraction unit 45 to be flame-retardantly isolated from the primary power distribution area 13.

[0055] Each sampling branch pipe 40 is sequentially equipped with a fixed throttling device 41, a check valve 42, a flow detection point, and a smoke detection chamber 43. Smoke enters the sampling branch pipe 40 through the smoke sampling port 33, flows through the fixed throttling device 41 and the check valve 42, passes through the smoke detection chamber 43, and then merges into the common sampling pipe 44. The outlet of the common sampling pipe 44 is connected to the extraction unit 45. When the extraction unit 45 is working, it creates a negative pressure within the common sampling pipe 44, causing the smoke in each flame-retardant sensing zone 30 to flow directionally into the corresponding smoke detection chamber 43 along the corresponding sampling branch pipe 40. The outlet side of the smoke detection chamber 43 is connected to the common sampling pipe 44, allowing multiple sampling branches to share the extraction unit 45 while maintaining the independent smoke detection output of each flame-retardant sensing zone 30.

[0056] Figure 4 The three flame-retardant sensing zones Z1, Z2 and Z3 at the top correspond to three flue gas sampling branches, and the sampling branches 40 marked as 40-1, 40-2 and 40-3 serve Z1, Z2 and Z3 respectively. The same suffix after the fixed throttling device 41, check valve 42, flow detection device 46 and smoke detection chamber 43 indicates that they belong to the same sampling branch, and different suffixes do not indicate different types of devices. Figure 4 The flow detection points marked in the diagram are the detection positions where the flow detection element 46 obtains the flow of the corresponding sampling branch pipe 40. The solid arrows of each sampling branch indicate the direction in which the flue gas flows from the flame-retardant sensing zone 30 to the common sampling pipe 44 under the negative pressure formed by the extraction unit 45. The dashed arrows pointing from each flow detection element 46 and smoke detection chamber 43 to the controller 50 indicate the direction of detection signal transmission. Figure 4 Abnormal sampling flow will only generate a maintenance alarm with a corresponding unique partition identifier. It will not trigger the outgoing switch 22 to trip separately if the corresponding flame-retardant sensing partition 30 does not meet the branch power-off conditions.

[0057] The flue gas sampling port 33 is preferably located within the flame-retardant sensing zone 30 where natural hot airflow easily converges, and its direction is coordinated with the flow direction formed by the flame-retardant partition 31. The flue gas sampling port 33 can have a flared structure facing upwards towards the conductive connection part, or a flame-retardant dustproof net can be installed at the flared part. The dustproof net is used to prevent larger fibers, insects, or construction debris from entering the sampling branch pipe 40. Its flow area is larger than the effective flow area of ​​the sampling branch pipe 40 to prevent the dustproof net from becoming a major flow-blocking point under normal clean conditions. The dustproof net can be removed from one side of the maintenance passage 17, allowing maintenance personnel to clean it without entering between live conductors.

[0058] The sampling branch pipe 40 is made of flame-retardant and insulated tubing with a continuous inner wall. Smooth bends or elbows are used at pipe turns to reduce localized dust accumulation. The actual length of each sampling branch pipe 40 varies depending on the distance between the flue gas sampling port 33 and the safety control area 14. If each sampling branch pipe 40 is directly connected to the common sampling pipe 44, the sampling branch closer to the extraction unit 45 may have a larger flow rate, while the sampling branch farther from the extraction unit 45 may have a smaller flow rate, resulting in inconsistent flue gas transmission time and detection sensitivity in different flame-retardant sensing zones 30. Therefore, in this embodiment, the equivalent flow resistance of each sampling branch pipe is set by the length, inner diameter, and flow cross-section of the fixed throttling element 41, ensuring that the sampling flow rate of each sampling branch pipe 40 falls within the same preset sampling flow rate range.

[0059] The fixed throttling element 41 can be a flame-retardant throttling plate with a calibration through-hole, a fixed-diameter connector, or a flow-limiting structure that cannot be arbitrarily changed by ordinary operators. For sampling branch pipes 40 with shorter lengths and lower natural flow resistance, a fixed throttling element 41 with a smaller flow cross-section is configured; for sampling branch pipes 40 with longer lengths and higher natural flow resistance, a fixed throttling element 41 with a larger flow cross-section is configured. The fixed throttling element 41 remains fixed after assembly and calibration to prevent changes in channel flow rate due to vibration or misoperation during operation. When readjustment is required, it is accomplished by replacing the fixed throttling element 41 with a fixed through-hole with a different calibration, without relying on the controller 50 to compensate for severe flow deviations through software.

[0060] The permissible flow direction of the check valve 42 is from the flue gas sampling port 33 to the common sampling pipe 44. When the extraction unit 45 is running, the check valve 42 opens under negative pressure; when the extraction unit 45 stops or the pressure inside the common sampling pipe 44 is higher than the pressure at the inlet side of the sampling branch pipe 40, the check valve 42 closes to reduce the backflow of residual flue gas in the common sampling pipe 44 to other flame-retardant sensing zones 30. The opening pressure difference of the check valve 42 is lower than the pressure difference that the corresponding sampling branch can provide under normal sampling conditions, and it maintains airtightness to meet the purpose of flue gas detection after closing. By setting the check valve 42, the flue gas generated in a certain flame-retardant sensing zone 30 is less likely to enter the adjacent flame-retardant sensing zone 30 through the common sampling pipe 44 after the extraction stops, thereby reducing the possibility of abnormal increases in the smoke detection value of adjacent zones after the event ends.

[0061] Each sampling branch 40 is equipped with a flow detection element 46. The flow detection element 46 can be directly installed on the sampling branch 40, or the sampling flow rate of the sampling branch can be obtained through the branch pressure difference and a pre-calibrated flow rate correspondence. The output of the flow detection element 46 is associated with a unique zone identifier, enabling the controller 50 to determine the specific sampling branch where an abnormal flow occurs. The smoke detection chamber 43 is located downstream of the flow detection point. The smoke detection chamber 43 can adopt a photoelectric scattering detection structure, with its inlet and outlet connected in series with the sampling branch 40. The detection circuit outputs the smoke detection value corresponding to this sampling branch. The smoke detection chamber 43 does not directly contact the primary conductive parts, and its power supply and signal lines are processed by isolation or current limiting protection circuits before entering the controller 50.

[0062] During the assembly and calibration phase, the distribution box is placed in a smoke-free environment, and the box door, cooling fan, and controlled ventilation openings are kept in the predetermined calibration state. The extraction unit 45 is started, and the pressure in the common sampling pipe 44 is allowed to stabilize. The controller 50 sequentially reads the output of each flow detection element 46 and compares the current sampling flow rate of each sampling branch 40 with the preset sampling flow rate range. For sampling branches with a sampling flow rate higher than the preset sampling flow rate range, the flow resistance is increased by replacing the fixed throttling element 41 with one having a smaller flow cross-section. For sampling branches with a sampling flow rate lower than the preset sampling flow rate range, the pipe bends, joint seals, dust screen blockages, and check valve 42 opening status are checked first. After confirming that there are no pipe faults, the fixed throttling element 41 with a larger flow cross-section is then replaced. The testing and adjustment are repeated until the flow rate of all sampling branches is within the preset sampling flow rate range.

[0063] After achieving flow balancing, calibration aerosols that will not contaminate the distribution box are introduced near each flue gas sampling port 33, while maintaining a clean air environment for the other flue gas sampling ports 33. The controller 50 checks whether the output of the corresponding smoke detection chamber 43 rises before other smoke detection chambers 43, and checks whether the unique partition identifier carried by this output matches the current calibration position. If a non-corresponding smoke detection chamber 43 responds first, the controller checks whether the sampling branch pipe 40 is cross-connected, whether the smoke detection chamber address is configured incorrectly, and whether there are errors in the partition loop mapping table 51. This calibration process verifies the physical continuity between the flue gas sampling ports 33, sampling branch pipes 40, smoke detection chambers 43, and unique partition identifiers, and does not write the data formed by the calibration aerosol into the normal operating smoke baseline.

[0064] After the system is put into operation, the controller 50 periodically reads the sampling flow rate of each sampling branch under normal sampling conditions. When the sampling flow rate of a sampling branch is lower than the preset sampling flow rate range, the controller 50 outputs a low flow rate maintenance alarm and records the corresponding unique partition identifier. Low flow rate may be caused by dust accumulation on the dustproof screen, bending of the sampling branch pipe 40, blockage of the fixed throttling device 41, insufficient opening of the check valve 42, or obstruction of the joint by foreign objects. When the sampling flow rate of a sampling branch is higher than the preset sampling flow rate range, the controller 50 outputs a high flow rate maintenance alarm. High flow rate may be caused by damage to the sampling branch pipe 40, detachment of the joint, missing fixed throttling device 41, or abnormal pressure status of the common sampling pipe 44.

[0065] If multiple sampling branches experience flow changes in the same direction simultaneously, the controller 50 further checks the operating status of the extraction unit 45 and the pressure status of the common sampling tube 44. When the flow of all sampling branches decreases simultaneously, a maintenance alarm for the extraction unit or the common sampling tube is output first; when only one sampling branch has an abnormal flow, a branch maintenance alarm containing that unique zone identifier is output. The maintenance alarm indicates that the transmission status of the corresponding sampling channel deviates from the calibration status, but the maintenance alarm itself is not equivalent to the smoke detection value reaching the branch power-off threshold. Therefore, if the corresponding flame-retardant sensing zone 30 does not meet the branch power-off condition, the outgoing switch 22 will not be tripped separately due to the maintenance alarm.

[0066] Abnormal sampling flow rate is not used to cancel power-off conditions already established by other valid detection results. For example, if the temperature detection value of a flame-retardant sensing zone 30 reaches the temperature branch power-off threshold, and the current of the corresponding outgoing circuit exceeds the preset abnormal current threshold, even if a low flow maintenance alarm exists for the sampling branch in that zone, the controller 50 will still selectively power off according to the branch power-off condition formed by the correlation between temperature and abnormal current. Similarly, if the smoke detection value has already reached the smoke branch power-off threshold before the flow abnormality occurs, and satisfies the smoke-temperature correlation condition together with the temperature detection value within a preset correlation time, then the flow maintenance alarm will not block the already established branch power-off event. Therefore, the flow detection element 46 is used to identify whether the sampling channel needs maintenance, rather than forming a rejection condition that covers the smoke-temperature power-off determination.

[0067] Baseline storage unit 52 stores the temperature reference value and smoke baseline of each flame-retardant sensing zone 30 according to a unique partition identifier. The temperature reference value is associated with the load range of the corresponding outgoing circuit, and the smoke baseline is associated with the ventilation status of the distribution box. In one possible implementation, the normal operating current range of the outgoing circuit is divided into a low load range, a medium load range, and a high load range, and each load range stores the temperature reference value of the flame-retardant sensing zone 30 under normal operating conditions. The boundaries of the load ranges are set based on the rated current of the outgoing switch 22, the cross-section of the connecting conductor, and the actual load variation range, and it is not required that different outgoing circuits use the same current boundaries.

[0068] The temperature reference value is derived from historical periods when the corresponding outgoing circuit is operating normally, the sampled flow rate is within the preset sampled flow rate range, the temperature node 32 is in a valid state, and there is no fire alarm. The baseline storage unit 52 performs stability screening on continuously acquired normal temperature detection values ​​within the same load range, excluding transient data after the circuit breaker has just closed, the load has suddenly changed, the cabinet door has been opened, or the cooling fan has been switched, and then obtains the reference value that can represent the normal temperature rise level of the load range from the remaining data. After the outgoing terminal is tightened, the outgoing switch 22 is replaced, or the conductor cross-section is changed, the original temperature reference value is marked as pending update, and the controller 50 re-accumulates the normal operating data after maintenance to avoid continuing to use historical reference values ​​that are inconsistent with the current connection status.

[0069] The smoke baseline is stored separately for at least three ventilation states: cooling fan stopped, cooling fan running, and controlled vent closed. When the cooling fan is running, airflow within the chamber may alter the background response of ambient dust in the smoke detection chamber 43; when the controlled vent is closed, the pressure conditions at the sampling branch inlet may also change. Therefore, the baseline storage unit 52 does not directly mix smoke detection values ​​from different ventilation states into a single baseline. After a ventilation state switch, the controller 50 sets a transition period, during which the original smoke detection values ​​and the ventilation states before and after the switch are retained. Data from this transition period is not used to update the smoke baseline to avoid writing short-term fluctuations caused by ventilation switching into the long-term baseline.

[0070] The flue gas temperature correction unit 53 determines the corresponding load range based on the current loop current, reads the temperature reference value for that load range, and identifies the portion of the current temperature detection value that exceeds the normal load temperature rise level. When the current loop current is near the boundary between two load ranges, the flue gas temperature correction unit 53 can use a transition value between the reference values ​​of adjacent load ranges, or use a pre-set hysteresis range, to avoid frequent switching of the temperature reference value when the current fluctuates slightly near the range boundary. The temperature correction does not change the original temperature detection value; the original temperature detection value is still sent to the temperature comparator 71 and written to the event log.

[0071] For smoke detection values, the smoke temperature correction unit 53 reads the smoke baseline corresponding to the current ventilation status and subtracts the stable background response from the current smoke detection value. When the current smoke detection value is lower than the smoke baseline, the corrected smoke detection value is treated as a smoke-free increment, without generating a negative smoke amount. The slow update of the smoke baseline only uses data that has not reached the warning conditions, has normal sampling flow, and has a stable ventilation status; when the smoke detection value has been rising continuously or adjacent temperature nodes 32 have experienced synchronous temperature increases, the update of the smoke baseline of the corresponding flame-retardant sensing zone 30 is paused to avoid absorbing developing abnormal changes into the baseline.

[0072] If historical data matching the current load range and ventilation status is insufficient, the baseline storage unit 52 outputs a baseline insufficiency flag. Newly installed distribution boxes can initially be monitored using factory reference values ​​determined based on similar outgoing switches, conductor specifications, and smoke detection chambers 43, while gradually accumulating normal operation data for the distribution box. The baseline insufficiency flag indicates that the current correction basis has not yet been adapted to the field; it is not itself a warning condition, branch power outage condition, or extreme power outage condition. If the original temperature detection value reaches the extreme temperature threshold, the temperature comparator 71 can directly trigger the independent hardware trip component 70 regardless of whether a baseline insufficiency flag exists.

[0073] The power outage condition determination unit 54 receives the corrected temperature detection value and the corrected smoke detection value, and performs condition determination in conjunction with the current of the corresponding outgoing circuit. When a single corrected detection value continuously reaches the warning threshold, the power outage condition determination unit 54 outputs a warning and increases the sampling frequency; when the corrected temperature detection value and the corrected smoke detection value of the same flame-retardant sensing zone 30 reach the corresponding branch power outage threshold within a preset correlation time, a smoke-temperature correlated branch power outage condition is formed; when the corrected temperature detection value reaches the temperature branch power outage threshold and the corresponding circuit current exceeds the preset abnormal current threshold, a temperature-abnormal current correlated branch power outage condition is formed. When the original temperature detection value reaches the extreme temperature threshold, an extreme power outage input is directly formed without waiting for the baseline correction process to complete.

[0074] Taking the operation of flame-retardant sensing zones Z1, Z2, and Z3 as an example, when the temperature detection value of the outgoing circuit corresponding to Z1 increases due to the increase in normal load, but this temperature rise is consistent with the normal temperature reference value of the corresponding load range, and the smoke detection value of Z1 does not form a continuous increment exceeding the corresponding smoke baseline, the smoke temperature correction unit 53 does not determine this state as a branch power-off condition. When the cooling fan starts, and the smoke detection values ​​of Z1, Z2, and Z3 show background changes in similar directions due to airflow, the controller 50 calls the smoke baseline corresponding to the cooling fan's operating state and suspends baseline updates during the ventilation state transition period, without individually tripping the branch due to this common change.

[0075] When localized abnormal heating occurs at the conductive connection of Z2, the temperature detection value of Z2 continues to increase even after deducting the normal load temperature rise. Subsequently, the flue gas obtained from the flue gas sampling port 33 of Z2 causes the smoke detection chamber 43 of Z2 to output a continuously increasing smoke detection value. If the corrected temperature detection value and the corrected smoke detection value reach the corresponding branch power-off threshold within a preset correlation time, the controller 50 obtains the corresponding outgoing switch number from the partition circuit mapping table 51 according to the unique partition identifier Z2 and performs selective branch power-off. When Z1 and Z3 do not meet the branch power-off conditions, their corresponding outgoing circuits maintain their original power supply status.

[0076] After the branch circuit is de-energized or the main incoming switch 20 is tripped, the extraction unit 45, powered by the energy storage power supply component 80, switches to post-power-off monitoring flow rate. This monitoring flow rate is lower than the sampling flow rate during normal operation to reduce energy consumption, but not lower than the minimum flow rate required for effective detection by the smoke detection chamber 43. The controller 50 maintains an independent flow rate range for the post-power-off monitoring state, preventing intentionally reduced monitoring flow rates from being misinterpreted as a low-flow fault in the sampling channel. The smoke detection values ​​obtained after power-off are used to determine whether the smoke continues to increase or gradually dissipates, and are not used to update the smoke baseline under normal operating conditions.

[0077] Through the above structure and processing, the smoke generated by each flame-retardant sensing zone 30 reaches the smoke detection chamber 43 corresponding to the unique zone identifier via mutually distinguishable sampling branches. The fixed throttling device 41 keeps the flow rate of sampling branches 40 of different lengths within the same preset sampling flow rate range. The check valve 42 reduces backflow between branches after the extraction stops. The flow detection device 46 is used to identify blockages, leaks, or extraction abnormalities. The controller 50 then corrects the normal load temperature rise according to the load range and corrects the smoke background response according to the ventilation status, so that the branch power-off condition is established between the temperature detection value, smoke detection value, and loop current that have a zone source and have been corrected for the operating status.

[0078] Example 3 This embodiment combines Figure 5 This document describes the specific implementation of the branch power outage and feedback components, the signal processing within the power outage verification time window, the formation of the power outage verification failure signal, and the working process of the independent hardware tripping component 70 and the energy storage power supply component 80 completing the failure upgrade power outage.

[0079] like Figure 5 As shown, the branch circuit power-off and feedback assembly includes a branch circuit trip driver 60, an auxiliary contact 61, a current sensor 62, and an isolation voltage sampling circuit 63. An output isolation circuit is provided between the controller 50 and the branch circuit trip driver 60. The drive terminal of the branch circuit trip driver 60 is connected to the shunt trip unit, undervoltage trip unit, electric operating mechanism, or contactor coil of the corresponding outgoing switch 22. When a shunt trip unit is used, the branch circuit trip driver 60 outputs a pulse that meets the trip unit's operation requirements after receiving a trip command. When an undervoltage trip unit or contactor is used, the branch circuit trip driver 60 cuts off the holding circuit, causing the outgoing switch 22 or contactor to enter the open state. The branch circuit trip outputs of different outgoing circuits are mutually isolated, so that if a short circuit, open circuit, or device damage occurs in one drive channel, the electrical state of other branch circuit trip channels and the main switch trip channel is not changed.

[0080] Figure 5 The upper part shows the controller 50 sending a trip command to the branch trip driver 60 and receiving three types of verification signals from the auxiliary contact 61, current sensor 62 and isolation voltage sampling circuit 63. The middle part shows that the three verification conditions together form a verified power-off signal or a power-off verification failure signal is formed when any verification condition is not met. The lower part shows that the extreme temperature signal, the main switch linkage trip signal output by the controller 50 and the power-off verification failure signal are acted on the incoming main switch 20 through the logic trigger circuit 74, latching circuit 75 and main switch trip driver 76. Figure 5The two or more zones marked in the lower left corner reach the branch power failure condition, specifically referring to two or more flame-retardant sensing zones 30 corresponding to different outgoing switches 22 reaching the branch power failure condition; two or more flame-retardant sensing zones 30 associated with the same outgoing switch 22 are merged into one branch power failure event. Figure 5 The lower right corner indicates that the flue gas temperature continues to rise after the trip. The controller 50 determines this according to the extreme power-off conditions, and the extreme power-off input is sent to the logic trigger circuit 74 via the linkage trip input circuit 72. Figure 5 The symbol ≤ in the text indicates that it is not higher than the corresponding threshold; the three conditions of the auxiliary contact being in the open state, the circuit current not being higher than the power-off current threshold, and the load side voltage not being higher than the power-off voltage threshold are logically ANDed; the extreme temperature signal, the main switch linkage trip signal, and the power-off verification failure signal are logically ORed. Figure 5 The solid arrows in the diagram indicate the direction of transmission of detection or control signals, while the dashed arrows indicate the backup power supply relationship provided by the energy storage power supply component 80.

[0081] The branch trip driver 60 is equipped with a drive status feedback terminal. This terminal confirms whether the driver has received a trip command and whether a drive output has been generated; however, it is not sufficient evidence of actual power failure. Even if the driver outputs a trip pulse, the circuit may not be cut off due to a broken trip coil, jammed mechanism, stuck contacts, or mechanical transmission failure. Therefore, while recording the branch trip drive status, the controller 50 also needs to read the auxiliary contact 61, loop current, and load-side voltage, which are directly related to the action result of the outgoing switch 22.

[0082] The auxiliary contact 61 is linked to the mechanical opening and closing mechanism of the outgoing switch 22. When the outgoing switch 22 moves from the closed position to the open position, the auxiliary contact 61 outputs the corresponding open state. The detection circuit of the auxiliary contact 61 is connected to the controller 50 after being isolated by opto-isolation, relay isolation, or current limiting protection. The controller 50 can identify whether the auxiliary contact 61 is in the closed state, open state, or abnormal line state. To identify a broken auxiliary contact line, a state resistor can be set in the detection circuit or an auxiliary switch with complementary contacts can be used. When two complementary states are simultaneously effective, simultaneously ineffective, or frequently change when the outgoing switch 22 is not activated, the controller 50 marks this input as an auxiliary contact feedback abnormality.

[0083] A current sensor 62 is installed in the outgoing circuit downstream of the outgoing switch 22. It can be a current transformer, a Hall effect current sensor, or other current detection structure with electrical isolation capabilities. The current sensor 62's range covers the normal operating current of the corresponding outgoing circuit and can distinguish the low current state required for power-off verification. The controller 50 compares the circuit current output by the current sensor 62 with the power-off current threshold. The power-off current threshold is set based on the zero-point deviation of the current sensor 62, electromagnetic interference in the distribution box, and the allowable residual current after the load is disconnected. Its function is to distinguish the measurement fluctuations near the sensor's zero point from the actual conducting current that still exists, rather than resetting the overload protection value of the outgoing circuit.

[0084] An isolation voltage sampling circuit 63 is connected between the load side and the corresponding reference terminal of the outgoing line switch 22 to obtain the load side voltage. The isolation voltage sampling circuit 63 includes a current-limiting and voltage-reducing section, an isolation conversion section, and an output conditioning section. The current-limiting and voltage-reducing section converts the load side voltage into a signal suitable for isolation conversion. The isolation conversion section electrically isolates the primary side sampling terminal from the low-voltage detection terminal of the controller 50. The output conditioning section rectifies, filters, or performs analog-to-digital conversion on the isolated signal. For multi-phase outgoing line circuits, the load side voltage of each phase can be detected separately, or a multi-phase combined detection can be used while ensuring that residual energization in any phase can be identified. The controller 50 compares the load side voltage with the power-off voltage threshold to identify contact adhesion, bypass power supply, reverse power supply, or other states that keep the load side energized.

[0085] When the controller 50 sends a trip command to the branch trip driver 60, it records the moment the trip command is issued and establishes a power outage verification time window from that moment. The length of the power outage verification time window is based on the specified tripping time of the outgoing switch 22, the time required for the mechanical mechanism to complete the tripping, the inductive load current decay time, the filtering response time of the isolation voltage sampling circuit 63, and the detection cycle setting. This time window is longer than the time required for the outgoing switch 22 to complete tripping and feedback stabilization under normal conditions, and shorter than the allowable time to wait for the branch power outage during fire handling. Different specifications of outgoing switches 22 can use different power outage verification time windows, and the relevant parameters are stored in the configuration data along with the outgoing switch number.

[0086] After the power outage verification time window begins, the controller 50 does not immediately confirm the power outage based on a single sampling result. Instead, it continuously reads the auxiliary contact 61, the loop current, and the load-side voltage. The auxiliary contact 61 needs to transition from a closed state to an open state and remain stable within the time window. The loop current needs to decrease to no higher than the power outage current threshold, and the load-side voltage needs to decrease to no higher than the power outage voltage threshold. To reduce misjudgments caused by contact bounce, current transients, and voltage filtering delays during switch operation, the controller 50 can require all three verification conditions to be met simultaneously in a series of consecutive samplings before outputting a verified power outage signal. The number of consecutive samplings is set based on the sampling period and the operating characteristics of the outgoing switch 22, without changing the maximum allowable range of the power outage verification time window.

[0087] Within the power outage verification time window, when all three verification conditions are met simultaneously, the branch power outage and feedback component outputs a verified power outage signal. The controller 50 marks the corresponding outgoing circuit as verified power outage and stops repeatedly sending regular trip commands to the same branch, but continues to collect temperature and smoke detection values ​​from the flame-retardant sensing zone 30. If the temperature and smoke detection values ​​continue to rise within a preset observation time after the trip, even if the branch has been verified as powered out, the controller 50 still determines that the extreme power outage condition has been met and outputs a main switch trip signal to the independent hardware trip component 70.

[0088] If any of the auxiliary contact 61, the circuit current, or the load-side voltage fails to meet the corresponding verification conditions at the end of the power-off verification time window, the branch power-off and feedback component outputs a power-off verification failure signal. If the auxiliary contact 61 has not switched to the open state, the failure condition in the verification failure record is recorded as "mechanical open state not confirmed." If the auxiliary contact 61 is already in the open state but the circuit current is still higher than the power-off current threshold, the failure condition is recorded as "circuit current not disappeared." If the auxiliary contact 61 is already in the open state and the circuit current is not higher than the power-off current threshold, but the load-side voltage is still higher than the power-off voltage threshold, the failure condition is recorded as "load side still energized." When multiple conditions fail simultaneously, the verification failure record saves each condition separately, avoiding the compression of multiple failure reasons into a single, indistinguishable fault code.

[0089] If the detection circuit of auxiliary contact 61, loop current, or load-side voltage is diagnosed as open circuit, over-range, communication timeout, or invalid signal within the power-off verification time window, controller 50 will not use a default low value to replace the invalid detection result. Since an invalid detection result cannot prove that the outgoing circuit has been de-energized, the branch power-off and feedback component will treat the corresponding verification condition as an invalid condition and output a power-off verification failure signal. For example, if current sensor 62 does not return valid current data after tripping, it cannot output a verified power-off signal simply because auxiliary contact 61 is in the open state; if isolation voltage sampling circuit 63 has no valid output, it cannot be directly interpreted as the load-side voltage having disappeared.

[0090] The event logging and reset control component 81 establishes an event log for each branch power outage. The event log includes a unique partition identifier, corresponding outgoing switch number, the type of branch power outage condition, the time the trip command was issued, the branch trip drive status, the status change of auxiliary contact 61, loop current changes, load-side voltage changes, the power outage verification time window, and the final verification result. When a power outage verification failure signal is generated, the event log also includes the output status of the failed verification condition and the upgraded main switch trip signal. All data is saved using a common time base, enabling maintenance personnel to distinguish between different situations such as trip drive failure, switch mechanism failure, main contacts not fully open, reverse power supply on the load side, and detection channel failure.

[0091] The independent hardware trip component 70 uses isolated input / output interfaces with the controller 50. Its temperature comparator 71, trip linkage input circuit 72, verification failure input circuit 73, logic trigger circuit 74, latch circuit 75, and main switch trip driver 76 form a hardware signal path independent of the controller 50's program execution. The independent hardware trip component 70 can be installed on a separate circuit board or on a different circuit board within the same safety control area 14 as the controller 50. The trip linkage signal is transmitted between the two via an opto-isolator, an isolating relay, or an isolating switch interface. The independent hardware trip component 70 does not obtain the power-off verification failure signal through the controller 50's software communication bus.

[0092] Temperature comparator 71 receives the extreme temperature detection channels from each temperature node 32. When using analog temperature nodes, each temperature detection channel is configured with a corresponding comparison input, and the comparison outputs are hardware-connected to form the extreme temperature signal. When using temperature nodes with independent switch-type over-temperature outputs, the over-temperature outputs are isolated and then connected to the logic trigger circuit 74. The extreme temperature threshold is higher than the temperature branch power-off threshold, and its setting is determined based on the allowable temperature of the outgoing switch 22, conductor insulation material, insulation components near the terminal, and flame-retardant partition 31. Temperature comparator 71 is configured with appropriate hysteresis so that the comparison output does not repeatedly switch on and off when the detected value fluctuates slightly near the extreme temperature threshold.

[0093] The linkage trip input circuit 72 receives the main switch trip signal output by the controller 50. When two or more flame-retardant sensing zones 30 corresponding to different outgoing switches 22 reach the branch circuit power-off condition, or when any flame-retardant sensing zone 30 reaches the extreme power-off condition of continuous rise in smoke temperature after tripping, the controller 50 makes the main switch trip signal valid. When two or more flame-retardant sensing zones 30 are associated with the same outgoing switch 22, the controller 50 first merges them into a single branch circuit power-off event, without repeatedly calculating multiple temperature measurement locations of the same outgoing circuit as multiple independent power-off objects. This processing ensures that a single outgoing circuit is still handled according to the selective branch circuit power-off process, while when two or more different outgoing circuits experience branch circuit power-off conditions, the main switch upgrade power-off process is initiated.

[0094] The verification failure input circuit 73 directly receives the power failure verification signal output by the branch power failure and feedback components. The verification failure input circuit 73 isolates, current-limits, and pulse-broadens the input signal, ensuring that even a valid failure signal shorter than the holding time of the latch circuit 75 can trigger the logic trigger circuit 74. Once the power failure verification signal is generated, there is no need to wait for the controller 50 to further determine the specific cause of the failure, nor is confirmation from the external monitoring device 87 required. Therefore, when the branch power failure result cannot be jointly confirmed by the three feedbacks, the upgraded power failure path can be completed locally.

[0095] The logic trigger circuit 74 executes hardware or logic relationships on the extreme temperature signal, the linkage trip input signal, and the power failure verification signal. When any input is valid, the logic trigger circuit 74 triggers the latch circuit 75. The latch circuit 75 can be a set-hold relay, a bistable trigger circuit, or a safety relay structure with hardware holding function, and its output continues to be held after the trigger input disappears. One latch output is connected to the main switch trip driver 76, and the other is connected to the reset latch output terminal 84, so that after the incoming main switch 20 trips, the latch cannot be automatically released due to a short-term drop in the smoke temperature detection value, the restart of the controller 50, or the restoration of remote communication.

[0096] The main switch trip driver 76 is connected to the shunt trip unit, undervoltage trip unit, or electric operating mechanism of the incoming main switch 20. The power output section of the main switch trip driver 76 is separate from the branch trip driver 60 and is supplied with the necessary power for tripping by the energy storage power supply component 80. The operating power supplies of the logic trigger circuit 74 and latch circuit 75 are isolated from or separately regulated from the operating power supply of the controller 50, ensuring that a short circuit, reset, or program malfunction in the controller 50 will not directly lower the operating voltage of the hardware safety chain. The output lines of the main switch trip driver 76 use conductors capable of withstanding the operating current of the trip coil and are arranged separately from ordinary sensor signal lines.

[0097] The energy storage power supply component 80 includes an energy storage element, an isolated charging circuit, an energy storage status detection circuit, and a controlled power supply output. The energy storage element can be a supercapacitor bank, a rechargeable battery, or other DC energy storage element that can meet the monitoring requirements after tripping and power failure. During normal operation, the isolated charging circuit obtains power from the auxiliary power supply of the distribution box and charges the energy storage element; after the voltage of the auxiliary power supply of the distribution box drops or the main incoming switch 20 trips, the controlled power supply output prevents the stored energy from flowing back into the de-energized auxiliary power bus and supplies power to the independent hardware tripping component 70, the zoned smoke and temperature acquisition component, the controller 50, and the event recording and reset control component 81.

[0098] The energy storage capacity is set to ensure that at least one trip of the main incoming switch 20 is completed, the current event record is saved, and the monitoring period after the preset power outage is maintained. The energy storage status detection circuit periodically reads the terminal voltage of the energy storage element and checks the voltage holding capability of the energy storage element under load by using a controlled detection load. Detecting only the no-load terminal voltage may not detect an increase in the internal resistance of the energy storage element. Therefore, the controller 50 briefly connects the detection load without affecting the normal trip reserve to determine whether the energy storage power supply component 80 has the ability to release trip energy and maintain monitoring. If the detection result is insufficient, the system outputs an energy storage maintenance alarm and writes the energy storage status into the event log.

[0099] The energy storage maintenance alarm does not actively consume remaining energy storage, nor does it prevent the independent hardware tripping component 70 from attempting to trip the incoming main switch 20 when an anomaly occurs. When extreme temperatures occur, power outage verification fails, or two or more flame-retardant sensing zones 30 corresponding to different outgoing switches 22 reach branch power outage conditions, the energy storage power supply component 80 prioritizes supplying power to the logic trigger circuit 74, latching circuit 75, and main switch tripping driver 76, while maintaining smoke temperature acquisition and event recording. The extraction unit 45 switches to a lower monitoring flow rate after power failure to reduce power consumption during continuous monitoring. If the energy storage state drops to a level that only guarantees event preservation, the event recording and reset control component 81 saves the current detection value, tripping input source, and energy storage state before entering a low-power holding state, while the latching circuit 75 continues to maintain the closing lockout in hardware.

[0100] Taking the outgoing switch Q2 corresponding to the unique partition identifier Z2 as an example, when Z2 meets the branch power-off condition, the controller 50 outputs a trip command to the branch trip driver 60 corresponding to Q2 and starts the power-off verification time window. If the auxiliary contact 61 switches to the open state, the Q2 circuit current drops below the power-off current threshold, and the Q2 load side voltage drops below the power-off voltage threshold, the system outputs a verified power-off signal and continues to observe the temperature detection value and smoke detection value of Z2 under energy storage power supply. If the auxiliary contact 61 does not switch, the circuit current does not drop, the load side voltage does not drop, or any verification channel has no valid data, the system outputs a power-off verification failure signal. The verification failure input circuit 73 drives the main switch trip driver 76 through the logic trigger circuit 74 and the latching circuit 75, causing the incoming main switch 20 to trip.

[0101] After the main incoming switch 20 trips, its auxiliary contacts and incoming current detection terminals can be used to further record the main switch's operating status, but this does not change the closing interlocking already formed by the latching circuit 75. If the main incoming switch 20 fails to complete mechanical tripping, the system maintains the latch output and continuously issues local maintenance alarms; if the communication interface 86 is still operational, the abnormal main switch operation is sent to the external monitoring device 87. Since the distribution box itself cannot replace the upstream power disconnection equipment, the maintenance alarm is used to prompt on-site personnel or the upstream control system to perform further isolation; the system does not interpret the lack of feedback from the main switch operation as a completion of safe power disconnection.

[0102] The reset terminal of the latch circuit 75 is connected to the event recording and reset control component 81. Remote communication commands can be used to query the latching reason and request a reset, but cannot directly clear the latching state. Only when the temperature detection value and smoke detection value of each flame-retardant sensing zone 30 are lower than the corresponding reset threshold, the temperature shows a downward trend, the voltage on each load side is not higher than the maintenance allowable voltage threshold, and the field reset input terminal 83 receives a manual reset signal, will the event recording and reset control component 81 output a reset allow signal to the latch circuit 75. The reset allow signal releases the hardware latch and closing lockout, but does not automatically drive the incoming main switch 20 or the outgoing switch 22 to close, thus reserving an independent operation link for maintenance personnel to complete insulation checks, wiring tightening, and faulty component replacement.

[0103] Through the aforementioned power outage verification and independent hardware upgrade process, the auxiliary contact 61 of the outgoing switch 22, the circuit current, and the load-side voltage verify the branch power outage result from three aspects: mechanical position, actual current, and energized state. If any verification condition is not met or the verification data is invalid, the system does not output a verified power outage signal, but instead generates a power outage verification failure signal and triggers the independent hardware tripping component 70. The independent hardware tripping component 70 completes signal latching and main switch tripping without relying on external communication and the software process of the controller 50. The energy storage power supply component 80 provides the tripping energy, the power required for post-power outage monitoring, and event storage after the normal auxiliary power supply disappears.

[0104] Example 4 This embodiment combines Figure 3 This describes the components of the distribution box, the functions of each module, and the specific implementation of each module within the box 10. The distribution box described in this embodiment can be an AC low-voltage distribution box, a power distribution box, a metering distribution box, a low-voltage switchgear, or other complete power distribution equipment with an incoming main switch 20 and multiple outgoing switches 22.

[0105] Enclosure 10 houses primary power distribution devices, smoke and temperature acquisition devices, control devices, and power-off actuators, and provides an installation foundation for the primary power distribution area 13 and the safety control area 14. Enclosure 10 also serves as a protective, grounding, flame-retardant isolation, and maintenance support. A mounting plate is located inside enclosure 10 to secure the main incoming switch 20, busbar 21, outgoing switch 22, cable trays, and flame-retardant partition 31, and to maintain electrical clearances and creepage distances between the primary conductors and the inner wall of the enclosure that meet the corresponding voltage levels.

[0106] The main incoming switch 20, busbar 21, and multiple outgoing switches 22 constitute the primary power distribution module of the distribution box. The main incoming switch 20 is used to connect or disconnect the main incoming power supply to the distribution box, and disconnects all outgoing circuits when the independent hardware trip component 70 outputs a main switch trip signal. The busbar 21 is used to distribute the electrical energy output from the main incoming switch 20 to each outgoing switch 22. Each outgoing switch 22 corresponds to an outgoing circuit that can be controlled individually. When the corresponding flame-retardant sensing zone 30 reaches the branch power-off condition, the branch trip driver 60 drives the outgoing switch 22 to trip.

[0107] The flame-retardant partition 31, mounting plate, cable tray wall, and inner wall of the enclosure together constitute a partitioned structure module. This module is used to form a flame-retardant sensing partition 30 corresponding to the outgoing circuit within the primary power distribution area 13, restricting the lateral diffusion of local hot airflow and smoke along the arrangement direction of the outgoing switches 22, and ensuring that smoke generated at a certain conductive connection 23 preferentially enters the smoke sampling port 33 of this flame-retardant sensing partition 30. The flame-retardant sensing partition 30 also provides a fixed position for a unique partition identifier, ensuring a stable correspondence between the physical space, smoke and temperature detection channel, and outgoing switch number.

[0108] Temperature node 32 performs near-source temperature detection for conductive connection part 23. Temperature node 32 outputs a temperature detection value associated with a unique zone identifier, enabling controller 50 to determine which flame-retardant sensing zone 30 the temperature rise occurred in. Temperature node 32 also provides an extreme temperature detection channel to temperature comparator 71, so that when the original temperature detection value reaches the extreme temperature threshold, a hardware trip input can be generated without relying on controller 50 to complete software determination.

[0109] The flue gas sampling assembly is responsible for the collection, transmission, detection, and sampling channel status monitoring of flue gas in different zones. The assembly includes a flue gas sampling port 33, a sampling branch pipe 40, a fixed throttling device 41, a check valve 42, a smoke detection chamber 43, a common sampling pipe 44, an extraction unit 45, and a flow detection device 46. The assembly directs the flue gas generated in different flame-retardant sensing zones 30 into the smoke detection chamber 43, which is associated with a unique zone identifier. It also identifies blockages, leaks, pipe detachments, or extraction anomalies through sampling flow detection.

[0110] The controller 50 is responsible for zone loop mapping, data acquisition, operating status correction, power outage condition determination, and control command output. The zone loop mapping table 51 within the controller 50 records the unique zone identifier, corresponding outgoing switch number, auxiliary contact address, current sampling terminal address, and load-side voltage sampling terminal address. The baseline storage unit 52 stores temperature reference values ​​and smoke baselines under different load ranges and ventilation conditions. The smoke and temperature correction unit 53 corrects for normal load temperature rise and ventilation background changes. The power outage condition determination unit 54 determines early warning, branch power outage, or extreme power outage handling based on the corrected temperature detection value, smoke detection value, loop current, and smoke and temperature changes after tripping.

[0111] The branch circuit power-off and feedback component performs selective disconnection of outgoing circuits and verification of power-off results. The branch circuit trip driver 60 drives the corresponding outgoing switch 22 to trip according to the trip command output by the controller 50; the auxiliary contact 61 provides feedback on the mechanical open / close position; the current sensor 62 detects whether there is still circuit current after tripping; and the isolation voltage sampling circuit 63 detects whether the load side of the outgoing switch 22 is still energized. A verified power-off signal is output when all three verification conditions are met; a power-off verification failure signal is output when any condition is not met or the corresponding detection data is invalid.

[0112] The independent hardware trip component 70 handles upgraded power-off functions in cases of branch power failure, multiple outgoing circuit abnormalities, and extreme temperature conditions. The temperature comparator 71, the linkage trip input circuit 72, and the verification failure input circuit 73 receive the extreme temperature signal, the main switch linkage trip signal output by the controller 50, and the power-off verification failure signal, respectively. The logic trigger circuit 74 performs hardware triggering on the above inputs, the latch circuit 75 maintains the trigger and closing lockout states, and the main switch trip driver 76 drives the incoming main switch 20 to trip. This component is electrically isolated from the controller 50; its hardware tripping path is not severed by external communication interruption or the controller 50 program stopping.

[0113] The energy storage power supply component 80 provides backup power supply for tripping and continuous monitoring power supply after power failure. During normal operation, the energy storage power supply component 80 obtains power from the auxiliary power supply of the distribution box via an isolated charging circuit. After the main incoming switch 20 trips or the auxiliary power supply disappears, the energy storage power supply component 80 supplies power to the independent hardware tripping component 70, the smoke temperature acquisition device, the extraction unit 45, the controller 50, and the event recording and reset control component 81. The energy storage status detection circuit periodically detects the terminal voltage and load discharge capacity of the energy storage elements. If the detection results are insufficient to complete the main switch tripping and the preset power failure monitoring, an energy storage maintenance alarm is output.

[0114] The event logging and reset control component 81 performs event storage, closing interlock, and on-site reset condition verification functions. The non-volatile memory 82 stores the unique partition identifier, temperature detection value, smoke detection value, loop current, load-side voltage, trip command, and power-off verification results. The on-site reset input terminal 83 receives manual reset signals from the distribution box, and the reset interlock output terminal 84 connects to the closing control circuit of the incoming main switch 20 and the outgoing switch 22. The reset interlock output terminal 84 remains locked if the smoke temperature has not dropped below the reset threshold, the temperature does not show a decreasing trend, the load side still has a voltage higher than the maintenance allowable voltage threshold, or no manual reset signal is received.

[0115] The ventilation actuator 85 performs the functions of normal heat dissipation and limiting air exchange during fire suppression. The ventilation actuator 85 includes a cooling fan and controlled vents. During normal operation, the cooling fan and controlled vents operate according to the internal temperature and conventional ventilation control strategy. When the temperature and smoke detection values ​​of the same flame-retardant sensing zone 30 reach their respective branch power-off thresholds, the controller 50 stops the cooling fan and closes the controlled vents. The extraction unit 45 continues to operate under energy storage power at a monitoring flow rate lower than the sampling flow rate before the branch power-off but not lower than the minimum detection flow rate of the smoke detection chamber 43.

[0116] Communication interface 86 is responsible for transmitting alarms, event logs, and maintenance status externally. Communication interface 86 can connect to external monitoring equipment 87, fire controllers, or on-site maintenance terminals to send unique zone identifiers, outgoing switch numbers, smoke and temperature detection data, power-off commands, and verification results. Communication interface 86 is electrically isolated from the independent hardware tripping component 70; communication status is not a necessary condition for branch tripping or main switch tripping. Remote devices can read events and submit reset requests, but cannot directly release the closing interlock by bypassing the on-site reset input terminal 83.

[0117] Based on the above functional division, the following explanation is provided. Figure 3 The distribution box shown has a specific structure and installation method. The box body 10 uses a metal shell with a protective grounding connection point. The box door is connected to the box body 10 via hinges, forming a protective space that meets the environmental requirements when the door is closed. A mounting plate is vertically fixed to the rear of the box body 10, and the mounting plate is equipped with device mounting rails, busbar supports, and cable trays. The interior of the box body 10 is divided into a primary power distribution area 13 and a safety control area 14 by a flame-retardant isolation plate 15. The flame-retardant isolation plate 15 is connected to the inner wall of the box body 10 and the mounting plate. The pipeline through-holes on the flame-retardant isolation plate 15 are equipped with flame-retardant sealed wiring portions 16 to prevent hot air and smoke generated in the primary power distribution area 13 from directly entering the safety control area 14 without passing through the sampling channel.

[0118] Figure 3 In the enclosure 10, the left side is the primary power distribution area 13, and the right side is the safety control area 14. The two areas are separated by a flame-retardant isolation plate 15 and a flame-retardant sealed wiring section 16. The suffixes -1, -2, and -3 in the attached drawings represent the same type of flame-retardant sensing zone 30, outgoing switch 22, conductive connection part 23, temperature node 32, and flue gas sampling port 33 corresponding to three different outgoing circuits, respectively. Devices with the same suffix belong to the same outgoing circuit. Flue gas and electrical connections are represented by solid lines, while temperature and switch feedback, backup power supply, and closing interlock connections are represented by dashed lines. The independent hardware tripping component 70 is directly connected to the incoming main switch 20 through a separate main switch tripping circuit; the event recording and reset control component 81 is connected to the closing control circuits of the incoming main switch 20 and the outgoing switch 22 via the reset interlock output terminal 84. This interlock connection does not serve as the source of the tripping signal for the incoming main switch 20.

[0119] Within the primary power distribution area 13, the main incoming switch 20 is located on the incoming side of the busbar 21, which is fixed to the mounting plate by an insulated busbar support. Multiple outgoing switches 22 are arranged sequentially along mounting rails and are electrically connected to the main incoming switch 20 via the busbar 21 or branch conductors. The load-side terminals of the outgoing switches 22 are connected to the corresponding outgoing conductors. The conductive connection points 23 include the incoming terminals of the outgoing switches 22, the load-side terminals, the busbar overlap, and the cable crimp terminals. Temperature nodes 32 are installed at appropriate locations based on potential heat generation and maintenance requirements.

[0120] Flame-retardant baffles 31 are installed at intervals along the arrangement direction of the outgoing switch 22. The rear side of each flame-retardant baffle 31 is connected to the mounting plate or the wall of the cable tray, the upper side extends above the corresponding conductive connection part 23, and the lower side extends to a position that can restrict the lateral exchange of air below. The side of the flame-retardant baffle 31 near the box door is spaced apart from the inner surface of the box door when closed, and each flame-retardant sensing zone 30 is connected on the box door side to form a maintenance passage 17. The maintenance passage 17 is used to operate the outgoing switch 22, check the unique zone identification, and disassemble and install the dustproof structure of the smoke sampling port 33, and does not serve as the main smoke flow channel between adjacent flame-retardant sensing zones 30.

[0121] The flame-retardant partition 31 is made of flame-retardant insulating material or metal plate with a continuous insulating layer on its surface. The edges of the flame-retardant partition 31 adjacent to the busbar 21, the terminals of the outgoing switch 22, and exposed conductors are rounded and maintain a specified insulation distance from exposed conductive parts. The flame-retardant partition 31 is fixed to the mounting plate and the cable tray wall by detachable fasteners, allowing maintenance personnel to remove a single flame-retardant partition 31 after the distribution box is de-energized and no dangerous voltage is confirmed, without having to remove the entire partition structure of other outgoing circuits.

[0122] Each flame-retardant sensing zone 30 is equipped with a fixed, unique zone identifier. The unique zone identifier is located on one side of the maintenance passage 17, and its number matches the record in the zone circuit mapping table 51 of the controller 50. The unique zone identifier can also simultaneously indicate the corresponding outgoing switch number, but the unique zone identifier and the outgoing switch number remain separate fields to accommodate installations where one outgoing circuit corresponds to more than two flame-retardant sensing zones 30. After replacing the outgoing switch 22, changing the purpose of the outgoing circuit, or re-dividing the flame-retardant sensing zone 30, the zone circuit mapping table 51 needs to be updated and the address verification re-completed.

[0123] Temperature node 32 is installed adjacent to conductive connection part 23. When using contact temperature node 32, the temperature sensing part is fixed to the temperature measuring position on the outside of the conductor insulation layer, near the terminal, or on the housing of the outgoing switch 22 by flame-retardant insulating clamps. The detection line enters the flame-retardant sealed wiring part 16 along the flame-retardant partition 31 or a dedicated low-voltage wire trough. When using non-contact temperature node 32, its detection direction is towards conductive connection part 23. The mounting bracket limits the detection field of view, making it less likely that high-temperature parts of adjacent outgoing circuits will be misidentified as the temperature of this flame-retardant sensing zone 30. The line or detection output of each temperature node 32 carries an address corresponding to the unique zone identifier.

[0124] The flue gas sampling port 33 is located above the flame-retardant sensing zone 30 and along the natural hot airflow path generated by the conductive connection 23. The flue gas sampling port 33 is connected to the sampling branch pipe 40 via a detachable connector. The sampling branch pipe 40 is arranged along the side of the flame-retardant partition 31 away from the exposed conductor or on the back side of the mounting plate and is fixed with insulating pipe clamps. Multiple sampling branch pipes 40 pass through the flame-retardant sealed wiring section 16 before entering the safety control area 14. The wiring section provides a flame-retardant seal for the gaps around the sampling branch pipes 40 and the detection circuitry. The sampling branch pipes 40 do not contact the exposed terminals of the busbar 21 or the outgoing switch 22, nor do they cross the surface of the main conductor where heat dissipation space is required.

[0125] The safety control area 14 is located on one side, the top, or another location isolated from the primary power distribution area 13 by flame retardant measures. The smoke detection chamber 43, common sampling tube 44, extraction unit 45, controller 50, independent hardware tripping component 70, energy storage power supply component 80, and event recording and reset control component 81 are installed in the safety control area 14. Low-voltage control device mounting rails and low-voltage cable trays are provided within the safety control area 14. The smoke ductwork is separately fixed from the electronic circuitry to prevent the control circuitry from being pulled during maintenance of the smoke detection chamber 43.

[0126] Each sampling branch pipe 40 is sequentially connected within the safety control zone 14 to a fixed throttling device 41, a check valve 42, a flow detection device 46, and a smoke detection chamber 43. The outlets of each smoke detection chamber 43 converge to a common sampling pipe 44, which is connected to the extraction unit 45. The fixed throttling device 41 can be positioned for easy replacement and has an identification mark corresponding to the calibrated flow cross-section. The installation direction mark of the check valve 42 points from the flue gas sampling port 33 to the common sampling pipe 44. The electrical connection terminals of the flow detection device 46 and the smoke detection chamber 43 are respectively connected to the corresponding input interfaces of the controller 50 and associated with the corresponding unique zone identifier in the zone loop mapping table 51.

[0127] Each outgoing switch 22 is equipped with an auxiliary contact 61. The auxiliary contact line is connected to the controller 50 through the control cable tray and flame-retardant sealed wiring section 16 in the primary power distribution area 13. The current sensor 62 is installed on the corresponding outgoing conductor, and its detection output is connected to the controller 50 after isolation conditioning. The primary sampling terminal of the isolation voltage sampling circuit 63 is connected to the load side of the outgoing switch 22, and the isolated low-voltage output terminal is located in the safety control area 14. The addresses of the auxiliary contact 61, the current sensor 62, and the isolation voltage sampling circuit 63 are all associated with the outgoing switch number, so that after the controller 50 issues a trip command for a certain branch, it only reads the three types of feedback corresponding to that branch.

[0128] Branch trip drive 60 is located within the safety control area 14, and its power output line is connected to the trip unit or electric operating mechanism of the outgoing switch 22 via the flame-retardant sealed wiring section 16. Multiple branch trip drive channels are each equipped with output protection and isolation devices. The main switch trip drive 76 is located on the circuit board where the independent hardware trip assembly 70 is located or in an adjacent installation position, and its output line is separately connected to the trip unit of the incoming main switch 20. Branch trip output lines, main switch trip output lines, and ordinary communication lines are arranged separately, and the main switch trip path does not share output devices with the communication interface 86.

[0129] The controller 50, independent hardware trip component 70, and energy storage power supply component 80 are arranged in the signal flow direction within the safety control area 14. The low-voltage outputs of temperature node 32, smoke detection chamber 43, flow detection element 46, auxiliary contact 61, current sensor 62, and isolated voltage sampling circuit 63 first enter the input side of the controller 50; the branch trip driver 60 is located on the control output side of the controller 50; the independent hardware trip component 70 retains only an isolated linkage trip interface with the controller 50 and directly receives power failure verification input and extreme temperature input; the energy storage power supply component 80 is set close to the main switch trip driver 76 to shorten the line providing trip power.

[0130] The event logging and reset control component 81 can be installed on the same low-voltage control board as the controller 50, or on a separate logging board. The non-volatile memory 82 maintains write integrity during switching between normal auxiliary power and the energy storage power supply component 80. The field reset input 83 connects to a reset button or key switch located inside the box door or on the access panel of the safety control area 14, allowing operation only when the distribution box is near in-situ. The reset lockout output 84 is connected in series with an isolating contact having a normally closed safety state in the closing permission circuit of the incoming main switch 20 and the outgoing switch 22; when the control power is lost, the logging board malfunctions, or the lockout signal is valid, the closing permission circuit remains in a state where it cannot automatically close.

[0131] The cooling fan of the ventilation actuator 85 can be installed on the upper or side of the enclosure 10, and the controlled ventilation opening is located on the enclosure wall corresponding to the cooling airflow path. The controlled ventilation opening is equipped with a damper or louver structure that can be driven to close by the controller 50, and a position feedback terminal is provided. After the controller 50 issues a fire linkage signal, it stops the cooling fan and closes the controlled ventilation opening, while keeping the exhaust unit 45 running with flow monitoring after power failure. If the cooling fan or the controlled ventilation opening fails to reach the command state, the controller 50 records a ventilation execution abnormality, but the ventilation execution abnormality does not delay the tripping of the outgoing switch 22 or the incoming main switch 20.

[0132] The communication interface 86 is installed in the safety control area 14 near the external wiring terminal. An isolated transceiver circuit is provided between its communication terminal and the controller 50, and the external communication line is led out separately from the primary power distribution conductor. The communication interface 86 can use a wired bus, industrial Ethernet, switch alarm interface, or wireless communication interface. Regardless of the communication method used, the external monitoring device 87 only receives alarms, event logs, and maintenance information, or sends parameter configuration and reset requests to the controller 50; extreme temperature signals, power failure verification failure signals, and main switch tripping drives do not pass through the external communication link.

[0133] After the distribution box is assembled, the installation continuity of the flame-retardant partition 31, flame-retardant isolation plate 15, flame-retardant sealed wiring part 16, and sampling branch pipe 40 is checked first in the de-energized state of the primary power distribution area 13. Then, the correspondence between the unique zone identifier and the outgoing switch number, temperature node address, smoke detection chamber address, and three types of feedback addresses is checked. Subsequently, the branch trip driver 60 and the main switch trip driver 76 are tested respectively to check whether the auxiliary contact 61, current sensor 62, and isolation voltage sampling circuit 63 can form feedback consistent with the switch action. The flue gas sampling component is calibrated according to the requirement that the flow rate of each sampling branch is within the same preset sampling flow rate range. The energy storage power supply component 80 is confirmed to be able to complete the main switch trip and post-power-off monitoring through load testing.

[0134] After the distribution box is put into operation, the temperature node 32 and the smoke sampling port 33 in the flame-retardant sensing zone 30 perform near-source monitoring of the conductive connection part 23. The controller 50 determines the corresponding outgoing switch 22 according to the zone circuit mapping table 51. When the flame-retardant sensing zone 30 corresponding to a single outgoing circuit reaches the branch power-off condition, the branch trip driver 60 only drives the outgoing switch 22 and verifies the actual power-off through the auxiliary contact 61, circuit current and load side voltage. If the power-off verification fails, two or more flame-retardant sensing zones 30 corresponding to different outgoing switches 22 reach the branch power-off condition, or any flame-retardant sensing zone 30 reaches the extreme power-off condition, the independent hardware trip component 70 drives the incoming main switch 20 to trip. After the power-off, the energy storage power supply component 80 maintains smoke temperature detection and event recording, and the reset lockout output terminal 84 remains locked until the smoke temperature, temperature change trend, load side voltage and on-site manual reset conditions are all met.

[0135] Through the above-described device structure, the primary power distribution devices, zoned smoke and temperature acquisition devices, and safety control devices form a defined spatial and electrical relationship within the enclosure 10. The flame-retardant sensing zone 30 aligns the smoke and temperature source with the outgoing circuit location. The safety control zone 14 provides flame-retardant isolation between the controller 50, the independent hardware tripping component 70, and the energy storage power supply component 80, the busbar 21, and the outgoing switch 22. The branch circuit power failure and feedback component allows the switch action results to be verified. The independent hardware tripping component 70 and the energy storage power supply component 80 provide a local hardware path for the main switch to trip after a branch circuit failure or the main power supply is lost.

[0136] Example 5 This embodiment combines Figure 6 This section describes the specific application of an intelligent smoke and temperature detection-linked power-off system in low-voltage power distribution scenarios in industrial plants. For example... Figure 6 As shown, the factory is equipped with a three-phase AC low-voltage power distribution box. The rated current of the incoming main switch Q0 is 250 A, and the three outgoing switches Q1, Q2, and Q3 supply power to the ventilation equipment, power equipment, and control equipment, respectively. The rated current of Q1 is 63 A, the rated current of Q2 is 100 A, and the rated current of Q3 is 32 A. Both the incoming main switch Q0 and the three outgoing switches are equipped with shunt trip units and auxiliary contacts. The incoming main switch Q0 corresponds to the incoming main switch 20, and Q1, Q2, and Q3 correspond to the outgoing switches 22. The ventilation equipment and control equipment need to maintain power supply when a single power branch is abnormal. Therefore, the distribution box first selectively disconnects the outgoing circuits that meet the branch disconnection conditions. If the branch disconnection verification fails, or if two or more flame-retardant sensing zones 30 corresponding to different outgoing switches 22 meet the branch disconnection conditions, or if any flame-retardant sensing zone 30 meets the ultimate disconnection conditions, then the incoming main switch Q0 is disconnected.

[0137] Figure 6The system consists of three areas: industrial low-voltage power distribution application site, single-zone anomaly and selective power outage, and upgraded handling, recording, and reset. The upper area shows that Q1, Q2, and Q3 supply power to ventilation equipment, power equipment, and control equipment, respectively. The connection line for anomaly is led from the load of power equipment Q2 to its corresponding flame-retardant sensing zone Z2. The middle area shows that the controller 50 identifies Q2 based on Z2 and selectively drives Q2 to trip, and then verifies it through auxiliary contact D2, circuit current A2, and load-side voltage V2. The lower area shows that after verification, Z2 continues to be monitored, and when verification fails or upgraded power outage conditions are met, the independent hardware tripping component 70 drives Q0 to trip, records the event, and maintains closed lockout. Figure 6 The upgraded power outage condition specifically refers to two or more flame-retardant sensing zones corresponding to different outgoing switches reaching the branch power outage condition, or any flame-retardant sensing zone reaching the ultimate power outage condition; this path does not wait for the selective branch power outage verification to be completed. Communication interface 86 sends alarms and event records to external monitoring equipment 87, but external communication does not participate in the formation of local branch tripping, main switch tripping, or field reset interlocking.

[0138] Q1, Q2, and Q3 correspond to flame-retardant sensing zones Z1, Z2, and Z3, respectively. Each flame-retardant sensing zone 30 is defined by a flame-retardant partition 31, a mounting plate, and the cable tray wall. Each flame-retardant sensing zone 30 has a contact-type platinum resistance temperature node 32 near the load-side terminal of the outgoing switch, and a smoke sampling port 33 is located above the terminal. The platinum resistance temperature node 32 is fixed to an insulating support position near the terminal by a flame-retardant insulating clamp, and its initial temperature output is simultaneously connected to the isolation acquisition channel of the controller 50 and the limit temperature detection channel of the temperature comparator 71.

[0139] Each flue gas sampling port 33 is connected to a photoelectric smoke detection chamber 43 via a flame-retardant and insulated sampling branch pipe 40. Each sampling branch pipe 40 is equipped with a fixed throttling device 41, a check valve 42, and a flow detection device 46, and converges to a common sampling pipe 44 and a DC extraction unit 45. In this embodiment, the flow rate of each sampling branch during normal operation is calibrated to be between 0.35 L / min and 0.45 L / min. After power failure, the monitored flow rate is set to 0.15 L / min for each sampling branch. The selected smoke detection chamber 43 can maintain detection at a flow rate of not less than 0.10 L / min. The above flow rate values ​​are the configuration values ​​of the selected pipe diameter, branch pipe length, and smoke detection chamber in this embodiment; when using other sampling structures, the corresponding flow rate range is determined according to the actual pressure loss and detection chamber requirements.

[0140] The outgoing conductors of Q1, Q2, and Q3 are each equipped with a closed-loop Hall current sensor 62, and an isolated voltage sampling circuit 63 is provided on the load side of the outgoing switch. The auxiliary contact 61, current sensor 62, and isolated voltage sampling circuit 63 are all connected to the controller 50 through an isolated input channel. The controller 50 is an industrial controller with non-volatile memory, a watchdog timer, and isolated digital input / output. The independent hardware tripping component 70 consists of a comparator, isolated input devices, hardware logic gates, a holding relay, and a main switch tripping driver, and completes the main switch tripping without using the software communication bus of the controller 50. The energy storage power supply component 80 uses a 24V DC backup power supply and an isolated charging circuit. Its capacity is selected to complete one tripping of the incoming main switch Q0 and maintain three-way smoke temperature detection, controller 50 operation, low-flow air extraction, and event recording for at least a preset monitoring period.

[0141] The partitioned loop mapping table 51 is configured according to Table 1. The addresses in the table are the internal device addresses used to describe the mapping relationships, and are not limited to the actual communication protocol.

[0142] Table 1. Partitioned Loop Mapping Configuration

[0143] Table 1 and Figure 6 In this diagram, Q0 represents the main incoming switch 20, and Q1, Q2, and Q3 represent the three outgoing switches 22 respectively; Z1, Z2, and Z3 represent the flame-retardant sensing zones 30 corresponding to Q1, Q2, and Q3 respectively; T1, T2, and T3 represent the sampling addresses of the corresponding temperature nodes 32; S1, S2, and S3 represent the sampling addresses of the corresponding smoke detection chambers 43; D1, D2, and D3 represent the sampling addresses of the corresponding auxiliary contacts 61; A1, A2, and A3 represent the sampling addresses of the corresponding current sensors 62; and V1, V2, and V3 represent the sampling addresses of the corresponding isolation voltage sampling circuits 63. Identifiers with the same numerical suffix correspond to the same outgoing circuit. The above alphanumeric combinations are all device or address identifiers and do not represent mathematical variables.

[0144] After system installation, establish load zone temperature reference values ​​during periods when all outgoing circuits are operating normally and no fire alarms occur. Q1, Q2, and Q3 are respectively divided into low-load, medium-load, and high-load zones based on their rated current, and do not use the same set of temperature reference values. Smoke baselines are established corresponding to the states of cooling fan stoppage, cooling fan operation, and controlled vent closure. Data from periods of sudden load changes, door opening, fan switching, abnormal sampling flow, and smoke temperature warnings are not used to update the baseline.

[0145] This embodiment uses the control parameters shown in Table 2. The smoke detection value is expressed as a percentage of the full scale of the selected smoke detection chamber, and the temperature correction value represents the portion of the current temperature detection value that exceeds the normal temperature reference value for the corresponding load range. The parameters in Table 2 are used to illustrate the control hierarchy and time relationship. In field applications, these parameters should be re-verified based on sensor accuracy, load type, and switching action time.

[0146] Table 2 Application Scenario Parameter Configuration

[0147] Table 2 Figure 5 and Figure 6 In the table, the symbol ≤ indicates that the value is not higher than the corresponding threshold, and the symbol % indicates the percentage relative to the full scale of the smoke detection chamber 43. Units s represent seconds, A represents amperes, V represents volts, ℃ represents degrees Celsius, and L / min represents liters per minute. Spaces between numbers and units are only used to distinguish numerical values ​​from legal units of measurement and do not indicate multiplication. The thresholds and times listed in Table 2 are the configuration values ​​for this embodiment, and each comparison relationship is executed according to the textual meanings of "reached," "not higher than," or "lower than" in the table.

[0148] During normal operation, Q1 supplies power to the ventilation equipment, Q2 supplies power to a motor-driven power unit, and Q3 supplies power to the control equipment. Controller 50 obtains the temperature and smoke detection values ​​of Z1, Z2, and Z3, along with the corresponding circuit currents, at a 2-second sampling period. When motor Q2 starts, controller 50 identifies the starting current based on a pre-set normal starting period, and does not establish a branch power-off condition based solely on a current exceeding 110 A during that period, thus linking temperature and abnormal current. After startup, the Q2 current enters the normal load range, and controller 50 retrieves the temperature reference value for that load range.

[0149] In the first event scenario, the Q2 load-side wiring becomes loose and generates localized heat, causing the initial temperature reading of Z2 to gradually increase. Initially, the corrected temperature reading reaches 15°C and is maintained for three consecutive samplings, while the corrected smoke reading has not yet reached the smoke warning threshold. Controller 50 outputs a temperature warning including both Z2 and Q2, and shortens the sampling period of Z2 to 0.5 s. Controller 50 saves the smoke temperature, current, auxiliary contact, and load-side voltage data before and after the warning, but does not trip Q2 at this time.

[0150] As the insulating material near the terminal heats up, pyrolysis fumes are generated. These fumes enter the smoke detection chamber S2 through the Z2 smoke sampling port 33 and the corresponding sampling branch pipe 40. The corrected temperature detection value of Z2 reaches 25 ℃, and the corrected smoke detection value reaches 30% of the full scale within a 30-second correlation time, thus satisfying the branch power-off condition related to smoke and temperature. The controller 50 reads the unique partition identifier Z2, determines the corresponding outgoing switch as Q2 through the partition circuit mapping table 51, stops the cooling fan, closes the controlled ventilation port, and outputs a trip command to the Q2 branch trip driver 60. Q1 and Q3 do not meet the branch power-off condition, and their power supply status is not changed due to the Z2 event.

[0151] After the trip command is issued, controller 50 initiates a 2-second power-off verification time window. If auxiliary contact D2 switches to the open state, current sampling A2 is not higher than 0.5 A, and load-side voltage V2 is not higher than AC 36 V, the system outputs the verified power-off signal corresponding to Q2. The extraction unit 45 switches to monitoring flow rate after power-off, and the energy storage power supply component 80 maintains Z2 smoke temperature detection and event writing. If the temperature detection value of Z2 gradually decreases and the smoke detection value gradually fades, the system maintains Q2 closed lockout, waiting for on-site personnel to check for loose terminals, insulation status, and switch contacts.

[0152] In the second event, controller 50 also issues a trip command to Q2, but Q2 fails to trip due to mechanical jamming. At the end of the power outage verification time window, if auxiliary contact D2 remains closed, current sampling A2 is still higher than the power outage current threshold, or load-side voltage V2 is still higher than the power outage voltage threshold, the branch power outage and feedback component outputs a power outage verification failure signal. Verification failure input circuit 73 sends this signal to logic trigger circuit 74, latching circuit 75 maintains the trigger, and main switch trip driver 76, supported by energy storage power supply component 80, drives incoming main switch Q0 to trip. This upgrade process is completed locally in the distribution box without waiting for confirmation from external monitoring equipment 87.

[0153] In the third event process, the outgoing circuits corresponding to Z1 and Z2 respectively reach the branch power-off condition. Since Z1 and Z2 correspond to different outgoing switches Q1 and Q2, the controller 50 outputs a main switch trip signal to the linkage trip input circuit 72, and the independent hardware trip component 70 drives the incoming main switch Q0 to trip. If two flame-retardant sensing zones are set at the incoming end and the load side of an outgoing circuit, and both zones are associated with the same outgoing switch, the controller 50 combines them into a single branch power-off event and does not treat them as two different outgoing circuits simultaneously experiencing anomalies.

[0154] During the fourth event, if the initial temperature detection value of any temperature node 32 reaches 105 ℃, the temperature comparator 71 directly outputs the limit temperature signal. The logic trigger circuit 74 and the latch circuit 75 drive the main switch trip driver 76 without waiting for temperature baseline correction, smoke-temperature correlation time, or external communication. When Q2 has completed the branch power-off verification, but the temperature detection value and smoke detection value of Z2 continue to rise within the 60 s observation time, the controller 50 also outputs a main switch trip signal to the linkage trip input circuit 72 according to the limit power-off condition.

[0155] The deterministic control results under different input states are shown in Table 3. Table 3 is used to illustrate the control output corresponding to the system logic and is not a statistical result of the test response time, failure probability, or detection accuracy.

[0156] Table 3 Comparison of Event Status and Control Results

[0157] After the incoming main switch Q0 or the outgoing switch completes the power-off, the event recording and reset control component 81 continuously reads the temperature and smoke detection values ​​of each flame-retardant sensing zone 30, and reads the voltage of each load side. If the original temperature detection value of any zone is not lower than 45 ℃, the corrected smoke detection value is not lower than 10% of full scale, the temperature does not show a downward trend, the voltage of any load side is higher than AC 36 V, or no manual reset signal is received, the reset lockout output terminal 84 remains locked. The external monitoring device 87 can display event data and reset condition status, but cannot directly release the lockout.

[0158] After confirming that the primary incoming line to the distribution box has been isolated, on-site personnel inspect the conductive connection points 23, outgoing switch contacts, conductor crimping status, sampling branch pipe 40, and smoke detection chamber 43 that meet the branch power-off conditions. After troubleshooting, the system continues to observe whether the smoke temperature is below the reset threshold and whether the temperature continues to decrease, and confirms that the load-side voltage is not higher than the maintenance allowable voltage threshold. When all the above conditions are met, on-site personnel operate the on-site reset input terminal 83, and the event recording and reset control component 81 releases the closing interlock. After the interlock is released, on-site personnel still operate the main incoming switch Q0 and the corresponding outgoing switches in the prescribed sequence; the system does not automatically restore power.

[0159] This embodiment illustrates the coordination between flame-retardant sensing zones, flue gas sampling flow balancing, load and ventilation status correction, selective branch power-off, power-off verification based on auxiliary contact 61, circuit current and load-side voltage, independent hardware upgrade tripping, and post-power-off reset interlocking through a specific configuration. When a single outgoing circuit meets the branch power-off condition and the power-off verification passes, outgoing circuits not associated with this event can maintain power supply; when the branch power-off cannot be confirmed by the three feedbacks, when two or more flame-retardant sensing zones 30 corresponding to different outgoing switches 22 meet the branch power-off condition, or when any flame-retardant sensing zone 30 meets the extreme power-off condition, the system switches to the incoming main switch tripping. The processing result is determined by pre-configured judgment conditions and hardware connection relationships, and does not rely on unexplained model inferences or external platform decisions.

[0160] The present invention has been described above with reference to specific embodiments, but the present invention is not limited to the specific embodiments described above. Equivalent substitutions or modifications made by those skilled in the art without departing from the technical concept of the present invention should fall within the protection scope of the present invention.

Claims

1. An intelligent smoke temperature detection and linkage power-off system, characterized in that, Includes zoned smoke temperature acquisition components, controllers, branch power-off and feedback components, and independent hardware tripping components; The partitioned smoke and temperature acquisition component includes a flame-retardant sensing partition with a unique partition identifier corresponding to the outgoing circuit, and temperature nodes and smoke sampling ports located in each flame-retardant sensing partition, used to output temperature detection values ​​and smoke detection values ​​associated with the unique partition identifier. The controller has a built-in partition circuit mapping table that records unique partition identifiers and corresponding outgoing switch numbers. Based on the temperature detection value, smoke detection value, and circuit current associated with the unique partition identifier, it determines whether the corresponding flame-retardant sensing partition has reached the branch power-off condition or the extreme power-off condition. The branch power-off condition is that the temperature detection value and smoke detection value of the same flame-retardant sensing partition reach their respective branch power-off thresholds, or the temperature detection value reaches the temperature branch power-off threshold and the circuit current exceeds the preset abnormal current threshold. The extreme power-off condition is that the temperature detection value reaches the extreme temperature threshold, or the temperature detection value and smoke detection value continue to rise after the outgoing switch receives a trip command. When the branch power-off and feedback component reaches the branch power-off condition of the flame-retardant sensing zone, it drives the corresponding outgoing switch to trip. It outputs a verified power-off signal only when the auxiliary contact is in the open state, the circuit current is not higher than the power-off current threshold, and the load side voltage is not higher than the power-off voltage threshold. Otherwise, it outputs a power-off verification failure signal. The independent hardware tripping component is electrically isolated from the controller. It drives the main incoming switch to trip when the power failure verification signal is valid, when two or more flame-retardant sensing zones corresponding to different outgoing switches reach the branch power failure condition, or when any flame-retardant sensing zone reaches the extreme power failure condition.

2. The intelligent smoke temperature detection and linkage power-off system according to claim 1, characterized in that, The flame-retardant sensing zone is defined by a flame-retardant partition, the mounting plate inside the distribution box, the cable tray wall, and the inner wall of the box, and covers the conductive connection parts of the corresponding outgoing circuit. The flame-retardant partition is spaced along the arrangement direction of the outgoing switches, and its side near the box door forms a maintenance passage with the box door. The flame-retardant partition restricts the lateral diffusion of smoke between adjacent flame-retardant sensing zones. The temperature node is located near the conductive connection parts, and the smoke sampling port is located at the hot airflow convergence position above the flame-retardant sensing zone, so that the smoke generated at the conductive connection parts preferentially enters the corresponding smoke sampling port. The unique zone identifier is fixedly set in the corresponding flame-retardant sensing zone. When there are two or more flame-retardant sensing zones for the same outgoing circuit, each unique zone identifier is associated with the outgoing switch number of that outgoing circuit.

3. The intelligent smoke temperature detection and linkage power-off system according to claim 2, characterized in that, The zoned smoke temperature acquisition component also includes sampling branch pipes, smoke detection chambers, a common sampling pipe, an extraction unit, and a flow detection device. Each smoke sampling port is connected in series with a smoke detection chamber through a sampling branch pipe. The outlets of each smoke detection chamber are connected to the common sampling pipe, which is connected to the extraction unit. Each sampling branch pipe is equipped with a fixed throttling device and a check valve. The length, inner diameter, and flow cross-section of the sampling branch pipe and the fixed throttling device are set to ensure that the sampling flow rate of each sampling branch pipe is within the same preset sampling flow rate range. The check valve prevents the smoke in the common sampling pipe from flowing back into the flame-retardant sensing zone after the extraction unit stops. The output end of each smoke detection chamber is associated with a corresponding unique zone identifier. The flow detection device sends the sampling flow rate of each sampling branch pipe to the controller. When the sampling flow rate of a sampling branch pipe exceeds the preset sampling flow rate range, the controller outputs the corresponding unique zone identifier and a sampling channel maintenance alarm. The maintenance alarm is prohibited from triggering the outgoing switch to trip when the branch power-off condition of the flame-retardant sensing zone is not met.

4. The intelligent smoke temperature detection and linkage power-off system according to claim 3, characterized in that, The controller includes a baseline storage unit, a smoke and temperature correction unit, and a power failure condition determination unit. The baseline storage unit stores temperature reference values ​​and smoke baselines according to load range and ventilation status during historical periods when the outgoing circuit is operating normally, the sampling flow rate is within the preset sampling flow rate range, and there is no fire alarm. The smoke and temperature correction unit deducts the temperature rise caused by normal load from the current temperature detection value of the corresponding flame-retardant sensing zone based on the correspondence between the current current of the corresponding outgoing circuit and the current and temperature rise calibrated during normal operation, and corrects the smoke detection value of the flame-retardant sensing zone by selecting the corresponding smoke baseline according to the current ventilation status. The power outage condition determination unit determines whether the corresponding flame-retardant sensing zone has reached the warning condition, branch power outage condition, or extreme power outage condition based on the corrected temperature detection value, smoke detection value, corresponding circuit current, and the changing trend of temperature detection value and smoke detection value after tripping. When the historical data of the current load range and ventilation status is insufficient, the controller outputs a baseline insufficient flag and prohibits the baseline insufficient flag from triggering tripping on its own.

5. The intelligent smoke temperature detection and linkage power-off system according to claim 4, characterized in that, The warning condition is that the corrected temperature detection value or smoke detection value reaches the corresponding warning threshold in a preset number of consecutive samplings; the branch power failure condition is that the corrected temperature detection value and the corrected smoke detection value of the same flame-retardant sensing zone reach the corresponding branch power failure threshold within a preset association time, or the corrected temperature detection value reaches the temperature branch power failure threshold and the current of the corresponding outgoing circuit exceeds the preset abnormal current threshold; the extreme power failure condition is that the temperature detection value reaches the extreme temperature threshold, or after the outgoing switch receives a trip command, the temperature detection value and smoke detection value of the corresponding flame-retardant sensing zone continue to rise within a preset observation time; when a flame-retardant sensing zone reaches the warning condition, the controller outputs a unique zone identifier, the corresponding outgoing switch number, and temperature warning or smoke warning information and increases the sampling frequency, and only drives the outgoing switch indicated by the zone circuit mapping table when it reaches the branch power failure condition; when two or more flame-retardant sensing zones are associated with the same outgoing switch, the controller merges them into a branch power failure event, and the remaining outgoing circuits remain powered.

6. The intelligent smoke temperature detection and linkage power-off system according to claim 1, characterized in that, The branch power-off and feedback component includes a branch trip driver connected to each outgoing switch, auxiliary contacts connected to the mechanical opening and closing mechanism of each outgoing switch, current sensors installed in each outgoing circuit, and isolation voltage sampling circuits installed on the load side of each outgoing switch. The controller sets a power-off verification time window from the moment the trip command is issued, and continuously reads the status of the corresponding auxiliary contacts, the circuit current, and the load-side voltage. When the auxiliary contacts remain in the open state within the power-off verification time window, the circuit current is not higher than the power-off current threshold, and the load-side voltage is not higher than the power-off voltage threshold, the branch power-off and feedback component outputs a verified power-off signal. When any of the aforementioned verification conditions are not met, the branch power-off and feedback component outputs a power-off verification failure signal and forms a verification failure record containing a unique partition identifier, the moment the trip command was issued, and the verification conditions not met.

7. The intelligent smoke temperature detection and linkage power-off system according to claim 6, characterized in that, The independent hardware tripping component includes a temperature comparator, a linkage tripping input circuit, a verification failure input circuit, a logic trigger circuit, a latching circuit, and a main switch tripping driver. The temperature comparator outputs a limit temperature signal when the temperature detection value at any temperature node reaches the limit temperature threshold. The controller outputs a main switch tripping signal to the linkage tripping input circuit when two or more flame-retardant sensing zones corresponding to different outgoing switches reach the branch power-off condition or when any flame-retardant sensing zone reaches the limit power-off condition. The verification failure input circuit receives the power-off verification failure signal. The logic triggering circuit drives the main switch tripping driver through the latching circuit according to any of the aforementioned signals. The system also includes an energy storage power supply component and an event recording and reset control component. The energy storage power supply component is charged through an isolated charging circuit and supplies power to the independent hardware tripping component, the zone smoke and temperature acquisition component, and the event recording and reset control component after the power distribution box is de-energized. The controller periodically checks the terminal voltage and discharge capacity of the energy storage power supply component. If the detection results are insufficient to complete the main switch trip and post-power-off monitoring, an energy storage maintenance alarm is output. The event recording and reset control component only releases the closing lockout when the temperature detection value and smoke detection value of each flame-retardant sensing zone are lower than the corresponding reset threshold, the load side voltage of each outgoing switch is not higher than the maintenance allowable voltage threshold, and a manual reset signal is received on site.

8. A distribution box, characterized in that, It includes a cabinet, mounting plate, main incoming switch, busbar, multiple outgoing switches, flame-retardant partition, temperature node, flue gas sampling assembly, controller, branch power-off and feedback assembly, and independent hardware tripping assembly. The incoming main switch, busbar, and outgoing switch are sequentially connected and installed on the mounting plate. The flame-retardant partition, together with the mounting plate, the cable tray wall, and the inner wall of the enclosure, forms a flame-retardant sensing zone corresponding to the outgoing circuit. Each flame-retardant sensing zone has a unique zone identifier. Temperature nodes are set near the conductive connection parts in the flame-retardant sensing zone, and a flue gas sampling port is set at the hot air gathering position above it. Each outgoing switch has auxiliary contacts, and each outgoing circuit has a current sampling terminal and a load-side voltage sampling terminal. The controller has a zoned loop mapping table, which records the unique zone identifier, outgoing switch number, auxiliary contact address, current sampling terminal address, and load-side voltage sampling terminal address. The controller determines whether each flame-retardant sensing zone has reached the branch power-off condition or the extreme power-off condition based on the temperature detection value output by the temperature node, the smoke detection value output by the smoke sampling component, and the loop current. The branch power-off condition is when the temperature detection value and smoke detection value of the same flame-retardant sensing zone reach their respective branch power-off thresholds, or when the temperature detection value reaches the temperature branch power-off threshold and the loop current exceeds the preset abnormal current threshold. The extreme power-off condition is when the temperature detection value reaches the extreme temperature threshold, or when the temperature detection value and smoke detection value continue to rise after the outgoing switch receives a trip command. The branch power outage and feedback component drives the corresponding outgoing switch to trip, and outputs a verified power outage signal only when the auxiliary contact is in the open state and the circuit current and load side voltage are not higher than the corresponding power outage threshold; otherwise, it outputs a power outage verification failure signal. The independent hardware tripping component is located in a safety control area that is flame-retardant isolated from the busbar and outgoing switches, and is connected to the tripping driver of the incoming main switch. When the power failure verification signal is valid, or when two or more flame-retardant sensing zones corresponding to different outgoing switches reach the branch power failure condition, or when any flame-retardant sensing zone reaches the extreme power failure condition, the incoming main switch is driven to trip.

9. The distribution box according to claim 8, characterized in that, The flame-retardant baffles are spaced apart along the arrangement direction of the outgoing switches; the smoke sampling assembly includes a sampling branch pipe, a smoke detection chamber connected in series with the sampling branch pipe, a common sampling pipe, an extraction unit, and a flow detection device. The outlets of each smoke detection chamber are connected to the common sampling pipe, which is connected to the extraction unit. Each sampling branch pipe is equipped with a fixed throttling device and a check valve, and is configured to keep the sampling flow rate within a preset sampling flow rate range. Each smoke detection chamber sends a smoke detection value containing a corresponding unique zone identifier to the controller, and the flow detection device sends the smoke detection value of each sample chamber to the controller. The sampling flow rate of the branch pipe; the sampling branch pipe maintains an insulating distance from exposed conductive parts; the distribution box also includes an energy storage power supply component, the air extraction unit, controller, independent hardware tripping component and energy storage power supply component are installed in the safety control area, a flame-retardant isolation plate is provided between the safety control area and the primary power distribution area, the sampling branch pipe, temperature node detection line and smoke detection chamber signal line enter the safety control area through the flame-retardant sealed wiring part on the flame-retardant isolation plate; the energy storage power supply component supplies power to the air extraction unit, independent hardware tripping component and controller after the power distribution box is de-energized.

10. The distribution box according to claim 9, characterized in that, It also includes an event logging and reset control component, a ventilation execution component, and a communication interface; the event logging and reset control component includes a non-volatile memory, an energy storage status detection circuit, a field reset input terminal, and a reset lockout output terminal. The energy storage status detection circuit is connected to the energy storage power supply component. The non-volatile memory is used to record unique zone identifiers, temperature detection values, smoke detection values, loop current, load-side voltage, trip commands, and power outage verification results; the event logging and reset is performed when the temperature detection value or smoke detection value of any flame-retardant sensing zone is not lower than the corresponding reset threshold, the temperature detection value of any flame-retardant sensing zone does not show a downward trend, and the load-side voltage is higher than the maintenance allowable value. When the voltage threshold is reached or no manual reset signal is received, the reset interlock output terminal locks the closing control circuit of the incoming main switch and the outgoing switch; the ventilation execution component includes a cooling fan and a controlled ventilation opening. When the temperature detection value and smoke detection value of the same flame-retardant sensing zone reach the power-off threshold of their respective branches, the controller stops the cooling fan and closes the controlled ventilation opening, while the extraction unit continues to operate under energy storage power supply at a monitoring flow rate lower than the sampling flow rate before the branch power-off and not lower than the minimum detection flow rate of the smoke detection chamber; the communication interface is used to send alarms and event records to external monitoring equipment and is electrically isolated from the independent hardware tripping component.

Images