Method for detecting insulation faults in a power distribution circuit of a fire emergency lighting and evacuation indication system

Abstract

The application discloses a fire emergency lighting and evacuation indication system distribution circuit insulation fault detection method, which comprises the following steps: an emergency lighting controller of a fire emergency lighting and evacuation indication system automatically sends an insulation fault detection signal to a subordinate emergency lighting centralized power supply; after receiving the insulation fault detection signal, the emergency lighting centralized power supply executes an insulation fault detection process; an insulation detection module transmits an insulation fault type and an insulation fault occurrence position to the fire emergency lighting and evacuation indication system; the fire emergency lighting and evacuation indication system automatically resets an emergency lighting centralized power supply main / backup power switch and an insulation good topology structure, and informs an operation and maintenance personnel to carry out maintenance. The application adopts an insulation detection module to control the connection and disconnection of each trunk and branch node of a distribution circuit, changes a circuit topology, analyzes insulation resistance detection values and insulation fault characteristics of different circuit topologies, automatically judges and locates an insulation fault, quickly processes the insulation fault and restores normal working states of each component of the system.

Description

Technical Field

[0001] This invention pertains to system fault detection and system fault location technology, and particularly relates to a method for detecting insulation faults in the power distribution circuit of a fire emergency lighting and evacuation guidance system. Background Technology

[0002] Fire emergency lighting and evacuation guidance systems provide lighting and evacuation guidance for personnel evacuation and for areas where work must continue during a fire. Their safe and reliable operation is crucial for ensuring safe operation in specific fire emergencies. When an insulation fault occurs in the power distribution circuit of a fire emergency lighting and evacuation guidance system, quickly identifying the fault location is of great significance for mitigating potentially significant hazards.

[0003] Currently, there is a lack of automated detection methods for insulation faults in the power distribution circuits of fire emergency lighting and evacuation guidance systems. This results in poor timeliness of fault detection, relying solely on manual fault detection and location, which is time-consuming, inefficient, and highly dependent on the experience of maintenance personnel. If insulation faults are not detected and addressed promptly, they can damage components after a period of operation. Disconnecting the power supply to the faulty circuit will prevent the system from functioning properly in the event of a building fire or other emergencies, potentially endangering personal safety. Therefore, timely detection and rapid handling of insulation faults are crucial for the long-term safe and stable operation of the system. Summary of the Invention

[0004] The purpose of this invention is to provide a method for detecting insulation faults in the power distribution circuit of a fire emergency lighting and evacuation guidance system that can quickly determine the location of the fault.

[0005] The objective of this invention is achieved through the following technical solution: a method for detecting insulation faults in the power distribution circuit of a fire emergency lighting and evacuation guidance system, characterized by comprising the following steps:

[0006] S1. The emergency lighting controller of the fire emergency lighting and evacuation guidance system automatically sends insulation fault detection signals to the centralized emergency lighting power supply under its jurisdiction.

[0007] S2. After receiving the insulation fault detection signal, the emergency lighting centralized power supply executes the following insulation fault detection procedure:

[0008] (1) Emergency lighting centralized power supply disconnects main and backup power;

[0009] (2) The insulation detection module installed in the emergency lighting centralized power supply reads the power distribution circuit topology of the emergency lighting centralized power supply and executes the following load-bearing power distribution circuit insulation resistance detection process: The insulation detection module tests the insulation resistance to ground of a single circuit in the order of circuit 1 to circuit N, that is, it inputs a test voltage of 500V, records the insulation resistance value at least 3 times, and then calculates the average value Rxd of the measured insulation resistance value to determine whether an insulation fault has occurred in the power distribution circuit:

[0010] If the average value Rxd ≥ the reference value 50MΩ, the insulation detection module marks the power distribution circuit of this category as a circuit with good insulation and uploads the power supply number and circuit number information to the emergency lighting controller of the fire emergency lighting and evacuation indication system.

[0011] If the average value Rxd < the reference value 50MΩ, the insulation detection module marks the distribution circuit of this category as an insulation fault circuit and proceeds to step (3).

[0012] (3) The insulation detection module performs the following unloaded power distribution circuit conductor insulation resistance detection process for the insulation fault circuit: The insulation detection module tests the insulation resistance of the unloaded conductor of the insulation fault circuit to ground, that is, inputs a test voltage of 500V, records the insulation resistance value at least 3 times, calculates the average value Rxk of each measured insulation resistance value, and combines the average value Rxk, the reference value of 50MΩ and the average value Rxd to comprehensively determine the type of insulation fault in the power distribution circuit.

[0013] (4) The insulation detection module performs a fault location process for lamp insulation faults, mixed wire and lamp insulation faults, and wire insulation faults according to the type of insulation fault in the power distribution circuit: the control logic set by the binary discard algorithm for the corresponding fault changes the network topology of the emergency lighting centralized power supply to determine the specific location of the insulation fault.

[0014] S3. The insulation detection module uploads the insulation fault type and location information to the fire emergency lighting and evacuation guidance system. The fire emergency lighting and evacuation guidance system automatically resets the main and backup power switches of the emergency lighting centralized power supply and the insulation good topology, and notifies the operation and maintenance personnel to carry out maintenance.

[0015] This invention employs an insulation detection module to automatically control the switching of each main and branch node in a power distribution circuit, thereby altering the circuit topology. Based on the analysis of insulation resistance detection values ​​and the characteristics of insulation faults in different circuit topologies, it achieves automatic judgment and location of insulation faults. This allows for rapid handling of insulation faults and restoration of normal operation of all system components, solving the problem of excessive reliance on manual methods in traditional insulation fault judgment and location, and is of significant importance.

[0016] The insulation fault types described in this invention refer to lamp insulation faults, mixed insulation faults of wires and lamps, and wire insulation faults. The wire insulation faults include positive insulation faults and negative insulation faults.

[0017] The steps of this invention for comprehensively determining the insulation fault type of a power distribution circuit are as follows:

[0018] When the average insulation resistance Rxk is less than the reference value of 50MΩ, the insulation detection module calculates the variation rate of insulation resistance value of the power distribution circuit under load and no-load conditions, P = (Rxd-Rxk) / Rxd×100%.

[0019] When P < 10%, the insulation detection module determines the insulation fault type of the power distribution circuit as a conductor insulation fault.

[0020] When P ≥ 10%, the insulation detection module determines the insulation fault type of the power distribution circuit as a mixed insulation fault of the conductor and the lamp.

[0021] When the average insulation resistance Rxk is greater than or equal to the reference value of 50MΩ, the insulation detection module determines that the insulation fault type of the power distribution circuit is a lighting insulation fault.

[0022] In the test of the insulation resistance detection process of the power distribution circuit under load, the present invention performs 3 to 5 tests on the insulation resistance of the positive and negative poles to ground for each circuit, with each test lasting 15 to 30 seconds.

[0023] In the test process of the insulation resistance detection procedure of the unloaded power distribution circuit conductor, the present invention performs 3 to 5 tests on the insulation resistance of the positive and negative poles to ground for each circuit, with each test lasting 15 to 30 seconds.

[0024] Compared with the prior art, the present invention has the following significant effects:

[0025] This invention employs an insulation detection module to automatically control the switching of each main and branch node in a power distribution circuit, thereby altering the circuit topology. Based on the analysis of insulation resistance detection values ​​and the characteristics of insulation faults in different circuit topologies, it achieves automatic judgment and location of insulation faults. This allows for rapid handling of insulation faults and restoration of normal operation of all system components, solving the problem of excessive reliance on manual methods in traditional insulation fault judgment and location, which is of great significance. Attached Figure Description

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0027] Figure 1 This is a flowchart of the present invention;

[0028] Figure 2 This is a schematic diagram of an insulation fault in a lamp according to the present invention (the lamp in the dashed box is the one that has failed). Detailed Implementation

[0029] like Figure 1 As shown, the present invention provides a method for detecting insulation faults in the power distribution circuit of a fire emergency lighting and evacuation guidance system, comprising the following steps:

[0030] S1. The fire emergency lighting and evacuation guidance system automatically sends insulation fault detection signals to the subordinate emergency lighting centralized power supply through the daily insulation inspection program in the emergency lighting controller. The daily inspection time can be set as needed.

[0031] The fire emergency lighting and evacuation guidance system is a centralized power supply and centralized control system, consisting of an emergency lighting controller, a centralized emergency lighting power supply, power distribution circuit conductors, and emergency lighting fixtures. The centralized emergency lighting power supply is equipped with remotely controlled main and backup intelligent circuit breakers and insulation detection modules. The emergency lighting fixtures are equipped with intelligent fixture drivers and intelligent circuit breakers. The insulation detection module and intelligent fixture drivers transmit real-time collected information to the fire emergency lighting and evacuation guidance system backend via messages.

[0032] The insulation detection module includes a logic control submodule, an execution submodule, a storage submodule, and a communication submodule. Each module has insulation detection logic judgment and control functions, insulation detection process execution functions, insulation resistance and topology storage functions, and communication functions with the emergency lighting controller.

[0033] The remotely controlled main and backup power intelligent circuit breaker is remotely controlled by the emergency lighting controller program background. The insulation detection module uploads the collected circuit information to the emergency lighting controller system. The collected circuit information includes the opening and closing status and communication status of the power distribution trunk output contacts of the intelligent lighting driver node module, and the opening and closing status and communication status of the power distribution branch output contacts. The topology of each centralized power distribution network in the system is updated periodically, and the local topology is read by receiving messages from the emergency lighting controller system.

[0034] S2. After receiving the insulation fault detection signal, the emergency lighting centralized power supply executes the following insulation fault detection procedure:

[0035] (1) Emergency lighting centralized power supply disconnects main and backup power;

[0036] (2) The insulation detection module installed in the centralized power supply for emergency lighting reads the topology of the power distribution circuit of the centralized power supply for emergency lighting and executes the following load-bearing power distribution circuit insulation resistance detection process (the load-bearing power distribution circuit insulation resistance detection process is the ground insulation detection process under the condition that the topology of the power distribution circuit network under test is not changed at this time): The insulation detection module tests the ground insulation resistance of a single circuit in the order of circuit 1 to circuit N, that is, inputs a test voltage of 500V, records 3 to 5 times (3 to 5 positive and negative ground insulation resistance tests are performed for each single circuit), and the insulation resistance value is tested for 15 to 30 seconds. Then, the average value Rxd of the insulation resistance values ​​measured is calculated to determine whether an insulation fault has occurred in the power distribution circuit.

[0037] If the average value Rxd is greater than or equal to the reference value of 50MΩ, the insulation detection module marks the power distribution circuit of this category as a circuit with good insulation and uploads the power supply number and circuit number information to the emergency lighting controller of the fire emergency lighting and evacuation indication system.

[0038] If the average value Rxd < the reference value 50MΩ, the insulation detection module marks the distribution circuit of this category as an insulation fault circuit and proceeds to step (3).

[0039] After executing the insulation resistance detection process for the under-load power distribution circuit, the insulation resistance detection module classifies, marks, and stores all tested power distribution circuits locally. The first category is circuits with positive or negative insulation faults, in which a fault type judgment subroutine is executed. The second category is circuits with good positive and negative insulation, in which insulation information is uploaded to the emergency lighting controller system database for storage and interface display. The uploaded insulation information includes the emergency lighting centralized power supply number and the positive and negative circuit numbers of the well-insulated power distribution circuits.

[0040] (3) The following insulation resistance testing procedure is performed on the unloaded distribution circuit conductors of the insulation fault circuit: The insulation detection module tests the insulation resistance of the unloaded conductors to ground of the insulation fault circuit by sending a control signal to disconnect the normally closed contact of the distribution branch line of the distribution circuit. That is, the insulation detection module inputs a 500V test voltage and records 3 to 5 times (three positive and three negative insulation resistance tests to ground for each circuit). The insulation resistance value is tested for 15 to 30 seconds, and then the average value Rxk of each measured insulation resistance value is calculated. Combined with the average value Rxk, the reference value of 50MΩ, and the average value Rxd, the insulation fault type of the distribution circuit is comprehensively judged. Specifically:

[0041] When the average value Rxk is less than the reference value of 50MΩ, the insulation detection module calculates the variation rate of the insulation resistance value of the power distribution circuit under load and no-load conditions, P = (Rxd - Rxk) / Rxd × 100%.

[0042] When P < 10%, the insulation detection module determines the insulation fault type of the power distribution circuit as a conductor insulation fault.

[0043] When P ≥ 10%, the insulation detection module determines the insulation fault type of the power distribution circuit as a mixed insulation fault of the conductor and the lamp.

[0044] When the average value Rxk is greater than or equal to the reference value of 50MΩ, the insulation detection module determines that the insulation fault type of the power distribution circuit is a lighting insulation fault.

[0045] (4) The insulation detection module performs a fault location process for lamp insulation faults, mixed wire and lamp insulation faults, and wire insulation faults according to the type of insulation fault in the power distribution circuit: the control logic set by the binary discard algorithm for the corresponding fault changes the network topology of the emergency lighting centralized power supply to determine the specific location of the insulation fault.

[0046] S3. The insulation detection module uploads the insulation fault type and location information to the fire emergency lighting and evacuation guidance system. The fire emergency lighting and evacuation guidance system automatically resets the main and backup power switches of the emergency lighting centralized power supply and the insulation good topology, and notifies the operation and maintenance personnel to carry out maintenance.

[0047] The workflow of the system implementing the detection method of the present invention is described in detail below:

[0048] The fire emergency lighting and evacuation guidance system monitors the operation information of power distribution circuits, automatically updates the topology, and performs daily insulation resistance checks. The system monitors information including the centralized power supply number for emergency lighting, the location information of the primary equipment of the main and backup circuit breakers, electrical quantities such as current (I), voltage (U), and power (P), and remote signaling quantities such as the sub-topology information of the centralized power supply. This monitored information is stored in a database. When the system's background clock reaches the set time, the system initiates an insulation detection program. The insulation detection interval is 24 hours. The system automatically reads the current power distribution circuit topology and triggers all centralized power supplies within the system to disconnect their main and backup circuit breakers. The insulation detection module performs the tests. After the insulation tests of all centralized power supply distribution circuits are completed, the insulation information is collected, and a daily insulation detection report is generated and sent to maintenance personnel.

[0049] The centralized power supply for emergency lighting enables automatic identification and updating of the local power distribution circuit topology, generation of insulation detection algorithm execution strategies, and identification and location of insulation faults. The insulation detection module configured in the centralized power supply can monitor the operating status of each power distribution circuit in real time. It can generate different detection strategies based on the differences in the topology of each power distribution circuit before insulation testing, automatically control the detection of the power distribution circuit topology according to the strategy, automatically analyze the detection data, integrate the insulation detection information of all power distribution circuits, generate a daily insulation detection report, and automatically upload it to the system backend after the insulation detection process is completed. The insulation detection module monitors information including the number of emergency lighting fixtures in each power distribution circuit, the communication status of the intelligent lighting fixture driver, the location information of normally closed output points of the power distribution trunk line and power distribution branch line, and electrical quantities such as current (I), voltage (U), and power (P). The insulation detection data includes the average resistance value after three to five tests lasting 15 to 30 seconds when a 500V test voltage is input to the positive and negative poles of each loaded power distribution circuit, the average resistance value after three to five tests lasting 15 to 30 seconds when a 500V test voltage is input to the positive and negative poles of each unloaded power distribution circuit, and the average resistance value of the sub-circuit generated by the detection strategy.

[0050] The insulation detection module uses a built-in algorithm to intelligently analyze the insulation status of each power distribution circuit based on the insulation resistance characteristics, and determines whether an insulation fault has occurred in each circuit, the type of insulation fault, and the location of the insulation fault.

[0051] like Figure 2 As shown, the fire emergency lighting and evacuation guidance system in this embodiment is a centralized power supply and centralized control type A system, consisting of one emergency lighting controller and one centralized emergency lighting power supply. The centralized power supply has two load-carrying circuits, with the remaining six circuits serving as backup circuits. The centralized power supply powers distribution circuits 01 and 02. Distribution circuit 01 carries 15 emergency lighting fixtures, and distribution circuit 02 carries 14 emergency lighting fixtures. The centralized power supply is equipped with main and backup intelligent circuit breakers and insulation detection modules, and all emergency lighting fixtures are equipped with intelligent lighting fixture drivers.

[0052] During normal operation, the insulation detection module of the centralized power supply collects the operating status information of the 01 power distribution circuit as follows:

[0053] 1) The 01 power distribution circuit carries 15 intelligent lighting drivers, with corresponding numbers 0101 to 0115;

[0054] 2) The communication status of the intelligent lighting fixture driver from 0101 to 0115 is good;

[0055] 3) The normally closed output points of the power distribution trunk line and power distribution branch line of the 0101~0115 intelligent lighting driver are all in the closed position.

[0056] During normal operation, the insulation detection module of the centralized power supply collects the operating status information of the 02 power distribution circuit as follows:

[0057] 1) The 02 power distribution circuit carries 14 intelligent lighting drivers, with corresponding numbers 0201 to 0214;

[0058] 2) The communication status of the intelligent lighting fixture drivers 0201 to 0214 is good;

[0059] 3) The normally closed output points of the power distribution trunk line and power distribution branch line of the 0201~0214 intelligent lighting driver are all in the closed position.

[0060] The insulation detection module collects the operating status information of the 01 and 02 power distribution circuits, generates the local power distribution circuit topology, and uploads it to the system backend. The system backend reads the message and automatically generates the system topology network structure. The operating status information and topology structure information are stored in the database.

[0061] The insulation detection module collects information and updates the local topology network at a time interval of 5 seconds, while the system topology network updates at a time interval of 1 hour.

[0062] Taking the daily insulation test time of the system at 2:00 AM as an example, and the insulation faults of lamps 0101 and 0105 in the centralized power supply 01 distribution circuit, the insulation fault detection method of the distribution circuit of the fire emergency lighting and evacuation indication system of this invention is illustrated with an example:

[0063] When the system clock reaches 2:00, the daily insulation inspection program is automatically started. The system background sends the main and backup power circuit breaker tripping command to the centralized power supply. The centralized power supply disconnects the main and backup power circuit breakers. The centralized power supply insulation detection module reads the local power distribution circuit topology network. The 01 power distribution circuit carries 15 emergency lighting fixtures, and the 02 power distribution circuit carries 14 emergency lighting fixtures.

[0064] The insulation detection module tests the single-circuit insulation resistance to ground under load in the order of circuit 01 and circuit 02. A test voltage of 500V is input, and the insulation resistance value is measured three times for 15 seconds each. The average value and judgment information are calculated as follows:

[0065] 1) The average insulation resistance of the positive and negative poles of the 01 circuit is R1d15 < 50MΩ;

[0066] 2) The average insulation resistance of the positive and negative poles of circuit 02, R2d15, is greater than 50 MΩ;

[0067] The insulation detection module analyzes the average insulation resistance of circuits 01 and 02, determines that circuit 01 has an insulation fault and marks it as an insulation fault circuit, and marks circuit 02 as an insulation good circuit, and stores the results in the insulation detection module database.

[0068] The insulation detection module tests the no-load insulation resistance to ground of circuit 01. The insulation resistance detection module sends a control signal to disconnect all normally closed contacts of the output of the distribution branch of circuit 01, that is, disconnect the normally closed contacts K1011 to K1151 of circuit 01.

[0069] The insulation resistance of circuit 01 under no-load conditions to ground is tested using the insulation testing module. A test voltage of 500V is input, and the insulation resistance is measured three times, each lasting 15 seconds. The average value and judgment information are calculated as follows:

[0070] 1) The average insulation resistance of the positive and negative poles of the 01 circuit is R1k15 > 50MΩ, so we take its value as 50MΩ;

[0071] 2) Based on the combined resistance values ​​of R1d15 and R1k15, the insulation fault type of circuit 01 is determined to be a lamp insulation fault;

[0072] The insulation detection module marks circuit 01 as a lamp insulation fault circuit and determines the fault location of circuit 01.

[0073] 01 Circuit Fault Location Determination:

[0074] 1) The insulation detection module collected the lighting fixture numbering information of circuit 01 from 0101 to 0115, which is 15 emergency lighting fixtures;

[0075] 2) The insulation detection module automatically generates the first-layer topology detection strategy based on the built-in binary discard algorithm. The first layer is divided into Q11 and Q12 sub-circuits. If both the rounding up and rounding down values ​​of the circuit are greater than 1, then the Q11 sub-circuit is determined to be the range of lamps 0101 to 0108, and the Q12 sub-circuit is determined to be the range of lamps 0109 to 0115.

[0076] 3) The insulation detection module automatically generates the Q11 sub-circuit control logic according to the first-layer detection strategy; the insulation detection module executes the Q11 control logic, sends a control signal to close the normally closed contacts K1011~K1081, inputs a 500V test voltage, measures the insulation resistance value three times for 15 seconds each time, and calculates the average value. If the average insulation resistance value of the positive and negative poles of the Q11 sub-circuit is RQ11<50MΩ, the Q11 sub-circuit is determined to be a positive and negative pole insulation fault circuit.

[0077] 4) The insulation detection module automatically generates the control logic for the Q12 sub-circuit based on the first-layer detection strategy; the insulation detection module executes the Q11 control logic, sends a control signal to open normally closed contacts K1011 to K1081, closes normally closed contacts K1091 to K1151, inputs a 500V test voltage, measures the insulation resistance value three times for 15 seconds each time, and calculates the average value. The average insulation resistance value of the positive and negative poles of the Q12 sub-circuit is found to be RQ12 > 50MΩ, and the Q12 sub-circuit is judged to be a circuit with good insulation for both positive and negative poles.

[0078] 5) The insulation detection module determines that the Q11 sub-circuit topology has 8 lamps and proceeds to the next step;

[0079] 6) The insulation detection module automatically generates a second-layer topology detection strategy based on the built-in binary discard algorithm. The second layer is divided into Q21 and Q22 sub-circuits. The Q21 sub-circuit is defined as the range of lamps 0101 to 0104, and the Q22 sub-circuit is defined as the range of lamps 0105 to 0108.

[0080] 7) The insulation detection module automatically generates the control logic for the Q21 sub-circuit according to the first-layer detection strategy; the insulation detection module executes the Q21 control logic, sends a control signal to open the normally closed contacts K1091~K1151, closes the normally closed contacts K1011~K1041, inputs a 500V test voltage, measures the insulation resistance value three times for 15 seconds each time, and calculates the average value. The average value of the insulation resistance of the positive and negative poles of the Q21 sub-circuit is RQ21<50MΩ, and the Q21 sub-circuit is determined to be a positive and negative pole insulation fault circuit.

[0081] 8) The insulation detection module automatically generates the control logic for the Q22 sub-circuit according to the first-layer detection strategy; the insulation detection module executes the Q22 control logic, sends a control signal to open the normally closed contacts K1011 to K1041, close the normally closed contacts K1051 to K1081, inputs a 500V test voltage, measures the insulation resistance value three times for 15 seconds each time, and calculates the average value. The average value of the insulation resistance of the positive and negative poles of the Q22 sub-circuit is RQ22 < 50MΩ, and the Q22 sub-circuit is determined to be a positive and negative pole insulation fault circuit.

[0082] 9) The insulation detection module determines that the Q21 and Q22 sub-circuit topology has 4 lamps and proceeds to the next step;

[0083] 10) The insulation detection module automatically generates a third-layer topology detection strategy based on the built-in binary discard algorithm. The third layer is divided into sub-circuits Q31, Q32, Q33, and Q34. If both the rounding up and rounding down values ​​of the circuit are greater than 1, then sub-circuit Q31 is determined to be the range of lamps 0101 and 0102, sub-circuit Q32 is the range of lamps 0103 and 0104, sub-circuit Q33 is the range of lamps 0105 and 0106, and sub-circuit Q34 is the range of lamps 0107 and 0108.

[0084] 11) The insulation detection module automatically generates the control logic for the Q31 sub-circuit according to the first-layer detection strategy; the insulation detection module executes the Q31 control logic and sends a control signal to open the normally closed contacts K1051 to K1081, close the normally closed contacts K1011 and K1012, input a 500V test voltage, measure the insulation resistance value three times for 15 seconds and calculate the average value. The average value of the insulation resistance of the positive and negative poles of the Q31 sub-circuit is RQ31 < 50MΩ, and the Q31 sub-circuit is determined to be a positive and negative pole insulation fault circuit.

[0085] 12) The insulation detection module automatically generates the Q32 sub-circuit control logic according to the first-layer detection strategy; the insulation detection module executes the Q32 control logic and sends a control signal to open the normally closed contacts K1011 and K1012, close the normally closed contacts K1013 and K1014, input a 500V test voltage, measure the insulation resistance value three times for 15 seconds and calculate the average value. The average insulation resistance value of the positive and negative poles of the Q32 sub-circuit is found to be RQ32 > 50MΩ, and the Q32 sub-circuit is judged to be a circuit with good insulation for the positive and negative poles.

[0086] 13) The insulation detection module automatically generates the control logic for the Q33 sub-circuit according to the first-layer detection strategy; the insulation detection module executes the Q33 control logic and sends a control signal to open the normally closed contacts K1013 and K1014, close the normally closed contacts K1015 and K1016, input a 500V test voltage, measure the insulation resistance value three times for 15 seconds and calculate the average value. The average value of the insulation resistance of the positive and negative poles of the Q33 sub-circuit is RQ33 < 50MΩ, and the Q33 sub-circuit is determined to be a positive and negative pole insulation fault circuit.

[0087] 14) The insulation detection module automatically generates the control logic for the Q34 sub-circuit according to the first-layer detection strategy; the insulation detection module executes the Q34 control logic and sends a control signal to open the normally closed contacts K1015 and K1016, close the normally closed contacts K1017 and K1018, input a 500V test voltage, measure the insulation resistance value three times for 15 seconds and calculate the average value. The average insulation resistance value of the positive and negative poles of the Q34 sub-circuit is found to be RQ34 > 50MΩ, and the Q34 sub-circuit is judged to be a circuit with good insulation for the positive and negative poles.

[0088] 15) The insulation detection module determines that the Q31 and Q33 sub-circuit topology contains 2 lamps and proceeds to the next step;

[0089] 16) The insulation detection module automatically generates a fourth-layer topology detection strategy based on the built-in binary discard algorithm. The fourth layer is divided into sub-circuits Q41, Q42, Q43, and Q44. If the first rounded-up and rounded-down values ​​of the circuit are 1, then the Q41 sub-circuit is determined to be lamp 0101, the Q42 sub-circuit to be lamp 0102, the Q43 sub-circuit to be lamp 0105, and the Q44 sub-circuit to be lamp 0106.

[0090] 17) The insulation detection module automatically generates the control logic for the Q41 sub-circuit according to the first-layer detection strategy; the insulation detection module executes the Q41 control logic and sends a control signal to open the normally closed contacts K1017 and K1018, close the normally closed contact K1011, input a 500V test voltage, measure the insulation resistance value three times for 15 seconds and calculate the average value. The average value of the insulation resistance of the positive and negative poles of the Q41 sub-circuit is RQ41 < 50MΩ, and the Q41 sub-circuit is determined to be a positive and negative pole insulation fault circuit.

[0091] 18) The insulation detection module automatically generates the control logic for the Q42 sub-circuit according to the first-layer detection strategy; the insulation detection module executes the Q42 control logic, sends a control signal to open the normally closed contact K1011, close the normally closed contact K1012, inputs a 500V test voltage, measures the insulation resistance value three times for 15 seconds each time, and calculates the average value. The average insulation resistance value of the positive and negative poles of the Q42 sub-circuit is found to be RQ42 > 50MΩ, and the Q42 sub-circuit is judged to be a circuit with good insulation for both positive and negative poles.

[0092] 19) The insulation detection module automatically generates the control logic for the Q43 sub-circuit according to the first-layer detection strategy; the insulation detection module executes the Q43 control logic, sends a control signal to open the normally closed contact K1012, close the normally closed contact K1015, inputs a 500V test voltage, measures the insulation resistance value three times for 15 seconds and calculates the average value. The average insulation resistance value of the positive and negative poles of the Q43 sub-circuit is found to be RQ43 < 50MΩ, and the Q43 sub-circuit is determined to be a positive and negative pole insulation fault circuit.

[0093] 20) The insulation detection module automatically generates the control logic for the Q44 sub-circuit according to the first-layer detection strategy; the insulation detection module executes the Q44 control logic, sends a control signal to open the normally closed contact K1015, close the normally closed contact K1016, inputs a 500V test voltage, measures the insulation resistance value three times for 15 seconds each time, and calculates the average value. The average insulation resistance value of the positive and negative poles of the Q44 sub-circuit is found to be RQ44 > 50MΩ, and the Q44 sub-circuit is judged to be a circuit with good insulation for both positive and negative poles.

[0094] 21) The insulation detection module determines that the Q41 and Q43 sub-circuit topology is 1 lamp, terminates the fault location process, and marks the lamps 0101 and 0105 corresponding to the Q41 and Q43 sub-circuit as lamps with insulation faults.

[0095] The emergency lighting centralized power supply insulation fault location process is terminated. The insulation detection module integrates the insulation fault information and uploads it to the system backend. The insulation fault information is as follows:

[0096] 1) An insulation fault occurred in the 01 distribution circuit of the emergency lighting centralized power supply;

[0097] 2) Emergency lighting fixtures at insulation fault locations 0101 and 0105.

[0098] The system automatically resets the main and backup power switches of the emergency lighting centralized power supply and the well-insulated topology, and notifies maintenance personnel to carry out maintenance.

[0099] In summary, the insulation failure detected in this test was a lighting fixture insulation failure. The fire emergency lighting and evacuation guidance system integrates the information uploaded by the insulation detection module and automatically outputs alarm information indicating that emergency lighting fixtures 0101 and 0105 have insulation failures. This alarm information is displayed on the system interface and pushed to the maintenance personnel so that they can quickly handle the situation and restore the system to normal operation.

Claims

1. A method for detecting insulation faults in the power distribution circuit of a fire emergency lighting and evacuation guidance system, characterized in that... Includes the following steps: S1. The emergency lighting controller of the fire emergency lighting and evacuation guidance system automatically sends insulation fault detection signals to the centralized emergency lighting power supply under its jurisdiction. S2. After receiving the insulation fault detection signal, the emergency lighting centralized power supply executes the following insulation fault detection procedure: (1) Emergency lighting centralized power supply disconnects main and backup power; (2) The insulation detection module installed in the emergency lighting centralized power supply reads the data of the emergency lighting centralized power supply. For a power distribution circuit topology network, the following insulation resistance detection procedure for a loaded power distribution circuit is executed: The insulation detection module tests the insulation resistance to ground of a single circuit in sequence from circuit 1 to circuit N. This involves inputting a 500V test voltage, recording at least three insulation resistance values, and then calculating the average value Rxd of each measured insulation resistance value to determine whether an insulation fault has occurred in the power distribution circuit. If the average value Rxd is greater than or equal to the reference value of 50MΩ, the insulation detection module marks the power distribution circuit of this category as a circuit with good insulation and uploads the power supply number and circuit number information to the emergency lighting controller of the fire emergency lighting and evacuation indication system. If the average value Rxd < the reference value 50MΩ, the insulation detection module marks the distribution circuit of this category as an insulation fault circuit and proceeds to step (3). (3) The insulation detection module performs the following unloaded power distribution circuit conductor insulation resistance detection process for the insulation fault circuit: The insulation detection module tests the insulation resistance of the unloaded conductor of the insulation fault circuit to ground, that is, inputs a test voltage of 500V, records the insulation resistance value at least 3 times, calculates the average value Rxk of each measured insulation resistance value, and combines the average value Rxk, the reference value of 50MΩ and the average value Rxd to comprehensively determine the type of insulation fault in the power distribution circuit. The steps for comprehensively determining the type of insulation fault in a power distribution circuit are as follows: When the average value Rxk is less than the reference value of 50MΩ, the insulation detection module calculates the variation rate of the insulation resistance value of the power distribution circuit under load and no-load conditions, P=(Rxd-Rxk) / Rxd×100%. When P < 10%, the insulation detection module determines the insulation fault type of the power distribution circuit as a conductor insulation fault. When P≥10%, the insulation detection module determines the insulation fault type of the power distribution circuit as a mixed insulation fault of the conductor and the lamp. When the average value Rxk is greater than or equal to the reference value of 50MΩ, the insulation detection module determines the insulation fault type of the power distribution circuit as a lighting insulation fault. (4) The insulation detection module executes the fault location process according to the type of insulation fault in the power distribution circuit: it changes the network topology of the emergency lighting centralized power supply according to the control logic set by the binary discard algorithm for the corresponding fault, and determines the specific location where the insulation fault occurred. S3. The insulation detection module uploads the insulation fault type and location information to the fire emergency lighting and evacuation guidance system. The fire emergency lighting and evacuation guidance system automatically resets the main and backup power switches of the emergency lighting centralized power supply and the insulation good topology, and notifies the operation and maintenance personnel to carry out maintenance.

2. The method for detecting insulation faults in the power distribution circuit of a fire emergency lighting and evacuation guidance system according to claim 1, characterized in that: In the test procedure for insulation resistance detection of power distribution circuits under load, each circuit undergoes 3 to 5 tests for the insulation resistance of the positive and negative poles to ground, with each test lasting 15 to 30 seconds.

3. The method for detecting insulation faults in the power distribution circuit of a fire emergency lighting and evacuation guidance system according to claim 2, characterized in that: In the test procedure for detecting the insulation resistance of conductors in unloaded power distribution circuits, each circuit undergoes 3 to 5 tests for the insulation resistance of the positive and negative poles to ground, with each test lasting 15 to 30 seconds.

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