Implementation method of intelligent low-voltage power distribution system

Abstract

The invention discloses an intelligent low-voltage power distribution system implementation method, and the method comprises the steps: enabling a low-voltage power distribution system not to need a UPS backup power supply when one or two power supplies disappear through designing the internal functions of an integrated or split type low-voltage spare power automatic switching device and an integration scheme of the integrated or split type low-voltage spare power automatic switching device and the low-voltage power distribution system; or the low-voltage circuit breaker generates a displacement signal, and the emergency power supply can actively report the displacement signal through a wireless signal in the self-switching and self-resetting action state, so that visual configuration and short message, voice and mail alarm reminding are formed on a system platform; through a one-master and two-slave or one-slave split spare power automatic switching device composition form and a design of setting a test button, a power supply and a communication line are laid to replace traditional N groups of wire harnesses, the problems of low field construction efficiency and tedious inspection, operation and maintenance are solved, and the construction efficiency is improved while the intelligentization of a low-voltage power distribution system is improved.

Description

Technical Field

[0001] The present invention belongs to the field of low-voltage power distribution, and in particular, relates to a method for realizing an intelligent low-voltage power distribution system. Background Art

[0002] The low-voltage distribution system has flexible and varied design schemes and a wide range of applications. It is the most widely used terminal system in power system distribution links, industrial users in industrial parks, urban residential areas and other places. At present, with the continuous advancement of the intelligent technology of complete sets of equipment in the power system main grid and 10kV high-voltage distribution network system, as an indispensable part of the power system application link, requirements are put forward for the intelligence of low-voltage distribution systems and their core equipment: how to ensure the reliability and continuous supply and distribution of low-voltage distribution systems to terminal users has become the focus of common concern of power equipment manufacturers and power operation and maintenance companies.

[0003] The current low-voltage power distribution system with a stock of ≥5 years is basically composed of 2 or 3 low-voltage frame circuit breakers plus N outgoing line circuits and compensation circuits. The 2 or 3 low-voltage frame circuit breakers are electrically interlocked to form a single busbar segmented system or a single busbar non-segmented system with dual power supply, thereby providing the main power supply for the N outgoing line circuits. The current incremental low-voltage power distribution system is based on the above-mentioned stock low-voltage power distribution system. A set of low-voltage busbar backup system has been added. The backup system includes a backup automatic device, UPS backup power supply, power switching device and N groups of control cables. Through the integrated design of the above-mentioned backup system and low-voltage frame circuit breakers, the low-voltage power distribution system can be automatically powered by another power supply after one power supply disappears.

[0004] However, no matter whether it is the existing or currently incremental low-voltage distribution system, there are still problems such as the failure to actively report power outages, the failure to promptly remind low-voltage circuit breaker action changes, the failure to visualize the operation of the distribution system, the need for regular manual maintenance of the UPS backup power supply, and the troublesome on-site wiring construction. Overall, the current low-voltage distribution system is not intelligent enough and cannot reach the same level of intelligence as the main grid and 10kV distribution network system; second, the wiring construction is troublesome and time-consuming and labor-intensive to implement.

[0005] In view of this, the present invention is proposed. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, provide an implementation method of an intelligent low-voltage power distribution system, and solve the problems raised in the above-mentioned background technology.

[0007] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0008] A method for realizing an intelligent low-voltage power distribution system includes a host and at least two slaves based on a split structure, and combines a voltage acquisition and switching module, a device power module, an input and output module, a liquid crystal display module, a video acquisition module, a 4G communication module, and an MCU main control unit to realize real-time monitoring and intelligent control of a low-voltage power distribution system, specifically including the following steps:

[0009] Collect the voltage signals of the two incoming power supplies as the input signals of the device, determine the power supply status through the voltage detection circuit, and switch to the backup power supply or start the backup power supply device according to the voltage status; generate voltage control signals to drive the operation of the circuit breaker and provide power support for the internal modules and external devices of the device;

[0010] Establish a communication connection between the host and the slave. The host processes the circuit breaker status information collected by the slave, including voltage signals, current signals and switch signals, and generates circuit breaker operation instructions to pass to the slave to realize the opening and closing control of the circuit breaker;

[0011] Monitor the system operation status, upload the operation parameters to the remote management platform through the data communication module, support real-time status monitoring and abnormal status alarm, and upload the data regularly or according to the operation requirements;

[0012] The power status change is simulated by operating the test button to verify the functional logic and operational reliability of the system, including power status detection, power switching, circuit breaker operation and operation monitoring functions.

[0013] Optionally, one end of the slave 1 is provided with 4 voltage sampling lines UA1-1, UB1-1, UC1-1, UN1-1, 2 RS485 communication lines A1, B1, 2 12-24 volt power lines L1 (+), L2 (-), and 2 control lines A1, C1, which are used to connect to the host; the other end is provided with 4 voltage sampling lines UA1, UB1, UC1, UN1, 4 current sampling lines IA1, IAN1, IC1, ICN1, 3 switch quantity sampling lines 1DLH, 1DLF, COM1, and 3 relay output lines 1HDL, 1FDL, COM2, which are respectively electrically connected to the A / B / C / N phase voltage, A / C phase current transformer, circuit breaker position and circuit breaker opening and closing coil of the 1# incoming line breaker of the low-voltage power distribution system;

[0014] One end of the slave 2 is provided with 4 voltage sampling lines UA2-1, UB2-1, UC2-1, UN2-1, 2 RS485 communication lines A2, B2, 2 12-24 volt power lines L3 (+), L4 (-), and 2 control lines A2, C2, which are used to connect with the host; the other end is provided with 4 voltage sampling lines UA2, UB2, UC2, UN2, 4 current sampling lines IA2, IAN2, IC2, ICN2, 3 switch quantity sampling lines 2DLH, 2DLF, COM3, and 3 relay output lines 2HDL, 2FDL, COM4, ​​which are respectively electrically connected to the A / B / C / N phase voltage, A / C phase current transformer, circuit breaker position and circuit breaker opening and closing coil of the 2# incoming line breaker of the low-voltage distribution system.

[0015] Optionally, a voltage sampling application circuit is used to collect the voltage signals of the two incoming power supplies, which includes:

[0016] Two voltage sampling lines, the two voltage sampling lines respectively collect the A-phase, B-phase, C-phase and neutral line voltage signals of the two incoming power supplies. The first power supply collects signals through the voltage sampling lines UA1, UB1, UC1, and UN1, and the second power supply collects signals through the voltage sampling lines UA2, UB2, UC2, and UN2;

[0017] A resistor voltage divider circuit, which is connected to the voltage sampling line and is used to divide the collected high voltage signal to ensure that the output signal is within a voltage range acceptable to the MCU;

[0018] A voltage switching module is connected to two voltage sampling lines and is used to switch the sampling signal path according to the power supply status. When one power supply fails, it switches to another power supply. When both power supplies fail, it switches to the backup power supply.

[0019] Two rectifier circuits, the two rectifier circuits are respectively connected to the two voltage signals and are used to rectify the voltage signals into direct current to supply power to subsequent circuits;

[0020] Two step-down circuits, which are connected to the rectifier circuit and are used to step down the rectified DC voltage into a working voltage suitable for powering the MCU main control circuit and peripheral modules;

[0021] A lithium battery charging and discharging module, which is connected to the rectifier circuit and the step-down circuit, is in a charging state when both power supplies are normal, and provides backup power for the MCU main control circuit and peripheral modules when both power supplies fail;

[0022] The signal output module is used to output the voltage signal after the resistor voltage division process to the MCU, so as to judge whether the two power supplies are in the voltage or not voltage state.

[0023] Optionally, the voltage signals of the two incoming power supplies are collected as the input signals of the device, the power supply status is determined by the voltage detection circuit, and the steps of switching to the backup power supply or starting the backup power supply device according to the voltage status are as follows:

[0024] The voltage signals UA1 / UB1 / UC1 / UN1 and UA2 / UB2 / UC2 / UN2 of the two incoming power sources are collected through the voltage sampling lines, and the collected voltage signals are transmitted to the resistor voltage divider network to reduce the signal voltage to the adaptation range;

[0025] After voltage division, the voltage signal is input to the voltage detection circuit, which transmits the signal to the MCU, which determines whether each power supply is in a voltage or no voltage state.

[0026] When both power supplies are under pressure, the system maintains the current power supply state, one power supply provides power to the device, the backup power supply is in standby state, and the lithium battery is in charging state;

[0027] When one power supply fails, the MCU sends a control signal, and the voltage switching module switches to another power supply. The backup power supply continues to power the system to ensure the operation of the equipment.

[0028] When both power supplies fail, the MCU determines that both power supplies are in a no-voltage state, and the host provides device power to slave 1 and slave 2 through L1(+) / L2(-) and L3(+) / L4(-) respectively.

[0029] Optionally, it also includes a video acquisition module, one end of which is connected to a camera for real-time acquisition of operating status video signals of two incoming circuit breakers and one connecting circuit breaker in the low-voltage power distribution system, and the other end of which communicates with the MCU for transmission of video processing results;

[0030] The video acquisition module will record video in a loop at a 1-minute interval during normal operation, and overwrite the previous video data after 1 minute.

[0031] When the MCU detects that the circuit breaker has a position change signal change, the video acquisition module marks the moment of position change as "time point 0", cuts the video information 1-10 seconds before and 1-10 seconds after the position change occurs, and generates a new video file with the cut video;

[0032] The newly generated video file is uploaded to the remote system through the 4G communication module as one of the criteria for the change of the state of the low-voltage power distribution system, and triggers an alarm signal to notify the system manager.

[0033] Optionally, the steps of switching to a backup power supply or starting a backup power supply device according to a voltage state; generating a voltage control signal for driving the operation of a circuit breaker, and providing power support for internal modules of the device and external devices are:

[0034] The switched voltage signal is processed by the rectifier circuit and the step-down circuit to generate a DC voltage, which provides working power for the main control unit, 4G communication module, video acquisition module, and LCD display module of the device;

[0035] The switched voltage passes through the voltage switching module at the same time to generate AC220V and AC380V control power supply signals, which are used to drive the operating coils of the incoming circuit breaker and the connecting circuit breaker to realize the opening and closing operations of the circuit breaker.

[0036] Optionally, the test button is electrically connected to the coils of the voltage relays KV1 and KV2 respectively; the voltage signals UA1 / UB1 / UC1 / UN1 and UA2 / UB2 / UC2 / UN2 of the two incoming power supplies are connected in series with the contacts of the two voltage relays after being connected from the device terminals, and are used as voltage sampling signals, device power supply and control power supply respectively;

[0037] After the device is installed, swing the incoming frame circuit breaker and the contact frame circuit breaker out to the test position for testing operations;

[0038] When the test button is pressed, the voltage relay cuts off the input voltage signal to simulate the power failure state; when the test button is released, the voltage signal is restored to simulate the power recovery state;

[0039] By operating the test button, verify the action logic of the low-voltage standby automatic transfer device under power failure and restoration conditions, including voltage switching and circuit breaker opening and closing operations.

[0040] Optionally, each slave independently collects status information of its corresponding circuit breaker, including:

[0041] Voltage signal acquisition: The A-phase voltage, B-phase voltage, C-phase voltage and neutral line voltage signals UA, UB, UC, and UN on the power supply side of the circuit breaker are collected through the voltage sampling line, and the collected signals are transmitted to the voltage detection circuit of the slave for subsequent voltage status judgment and processing;

[0042] Current signal acquisition: The A-phase and C-phase current signals IA and IC of the circuit breaker are respectively acquired through the current sampling line, and the acquired signals are input into the current detection circuit of the slave machine to monitor the working current status of the circuit breaker;

[0043] Switching signal acquisition: The mechanical position signal of the circuit breaker is collected through the switching sampling line, including the opening, closing and position status information of the circuit breaker, and the collected signal is transmitted to the signal processing module of the slave machine to reflect the operating status of the circuit breaker in real time.

[0044] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art. Of course, any product implementing the present invention does not necessarily need to achieve all the advantages described below at the same time:

[0045] By designing the internal functions of the integrated or split low-voltage backup automatic transfer device and its integration with the low-voltage power distribution system, the low-voltage power distribution system can actively report through wireless signals when one or two power supplies disappear, or when the low-voltage circuit breaker has a position change signal or the backup power supply is in automatic transfer and recovery state without the need for UPS backup power supply, and form a visual configuration and SMS, voice, and email alarm reminders on the system platform; through the design of one-master-two-slave or one-slave split backup automatic transfer device and the setting of test buttons, it is possible to lay power and communication lines instead of traditional N groups of wiring harnesses, improve the problems of low on-site construction efficiency and cumbersome inspection and operation and maintenance, and improve the intelligence of the low-voltage distribution system while improving construction efficiency.

[0046] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The drawings described below are only some embodiments. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0048] In the figure:

[0049] Figure 1 Schematic diagram of the voltage sampling application circuit of the present invention

[0050] Figure 2 This is the connection diagram of the split type automatic switching device

[0051] Figure 3 This is a diagram of the integrated self-throwing device of the present invention.

[0052] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0053] The present invention will now be described in further detail with reference to the accompanying drawings.

[0054] See also Figure 1-3 As shown, in this embodiment, a method for realizing an intelligent low-voltage power distribution system is provided, which is based on a host and at least two slaves of a split structure, and is combined with a voltage acquisition and switching module, a device power module, an input and output module, a liquid crystal display module, a video acquisition module, a 4G communication module, and an MCU main control unit to realize real-time monitoring and intelligent control of a low-voltage power distribution system, specifically including the following steps:

[0055] Collect the voltage signals of the two incoming power supplies as the input signals of the device, determine the power supply status through the voltage detection circuit, and switch to the backup power supply or start the backup power supply device according to the voltage status; generate voltage control signals to drive the operation of the circuit breaker and provide power support for the internal modules and external devices of the device;

[0056] Establish a communication connection between the host and the slave. The host processes the circuit breaker status information collected by the slave, including voltage signals, current signals and switch signals, and generates circuit breaker operation instructions to pass to the slave to realize the opening and closing control of the circuit breaker;

[0057] Monitor the system operation status, upload the operation parameters to the remote management platform through the data communication module, support real-time status monitoring and abnormal status alarm, and upload the data regularly or according to the operation requirements;

[0058] The power status change is simulated by operating the test button 1 to verify the functional logic and operation reliability of the system, including power status detection, power switching, circuit breaker operation and operation monitoring functions.

[0059] In this embodiment, one end of the slave 1 is provided with 4 voltage sampling lines UA1-1, UB1-1, UC1-1, UN1-1, 2 RS485 communication lines A1, B1, 2 12-24 volt power lines L1 (+), L2 (-), 2 control lines A1, C1, for connecting with the host; the other end is provided with 4 voltage sampling lines UA1, UB1, UC1, UN1, 4 current sampling lines IA1, IAN1, IC1, ICN1, 3 switch quantity sampling lines 1DLH, 1DLF, COM1, 3 relay output lines 1HDL, 1FDL, COM2, which are respectively electrically connected with the A / B / C / N phase voltage, A / C phase current transformer, circuit breaker position and circuit breaker opening and closing coil of the 1# incoming line circuit breaker of the low-voltage power distribution system;

[0060] One end of the slave 2 is provided with 4 voltage sampling lines UA2-1, UB2-1, UC2-1, UN2-1, 2 RS485 communication lines A2, B2, 2 12-24 volt power lines L3 (+), L4 (-), and 2 control lines A2, C2, which are used to connect with the host; the other end is provided with 4 voltage sampling lines UA2, UB2, UC2, UN2, 4 current sampling lines IA2, IAN2, IC2, ICN2, 3 switch quantity sampling lines 2DLH, 2DLF, COM3, and 3 relay output lines 2HDL, 2FDL, COM4, ​​which are respectively electrically connected to the A / B / C / N phase voltage, A / C phase current transformer, circuit breaker position and circuit breaker opening and closing coil of the 2# incoming line breaker of the low-voltage distribution system.

[0061] In this embodiment, a voltage sampling application circuit is used to collect voltage signals of two incoming power sources, which includes:

[0062] Two voltage sampling lines, the two voltage sampling lines respectively collect the A-phase, B-phase, C-phase and neutral line voltage signals of the two incoming power supplies. The first power supply collects signals through the voltage sampling lines UA1, UB1, UC1, and UN1, and the second power supply collects signals through the voltage sampling lines UA2, UB2, UC2, and UN2;

[0063] A resistor voltage divider circuit, which is connected to the voltage sampling line and is used to divide the collected high voltage signal to ensure that the output signal is within a voltage range acceptable to the MCU;

[0064] A voltage switching module is connected to two voltage sampling lines and is used to switch the sampling signal path according to the power supply status. When one power supply fails, it switches to another power supply. When both power supplies fail, it switches to the backup power supply.

[0065] Two rectifier circuits, the two rectifier circuits are respectively connected to the two voltage signals and are used to rectify the voltage signals into direct current to supply power to subsequent circuits;

[0066] Two step-down circuits, which are connected to the rectifier circuit and are used to step down the rectified DC voltage into a working voltage suitable for powering the MCU main control circuit and peripheral modules;

[0067] A lithium battery charging and discharging module, which is connected to the rectifier circuit and the step-down circuit, is in a charging state when both power supplies are normal, and provides backup power for the MCU main control circuit and peripheral modules when both power supplies fail;

[0068] The signal output module is used to output the voltage signal after the resistor voltage division process to the MCU, so as to judge whether the two power supplies are in the voltage or not voltage state.

[0069] In this embodiment, the voltage signals of the two incoming power sources are collected as the input signals of the device, the power supply status is determined by the voltage detection circuit, and the steps of switching to the backup power supply or starting the backup power supply device according to the voltage status are as follows:

[0070] The voltage signals UA1 / UB1 / UC1 / UN1 and UA2 / UB2 / UC2 / UN2 of the two incoming power sources are collected through the voltage sampling lines, and the collected voltage signals are transmitted to the resistor voltage divider network to reduce the signal voltage to the adaptation range;

[0071] After voltage division, the voltage signal is input to the voltage detection circuit, which transmits the signal to the MCU, which determines whether each power supply is in a voltage or no voltage state.

[0072] When both power supplies are under pressure, the system maintains the current power supply state, one power supply provides power to the device, the backup power supply is in standby state, and the lithium battery is in charging state;

[0073] When one power supply fails, the MCU sends a control signal, and the voltage switching module switches to another power supply. The backup power supply continues to power the system to ensure the operation of the equipment.

[0074] When both power supplies fail, the MCU determines that both power supplies are in a no-voltage state, and the host provides device power to slave 1 and slave 2 through L1(+) / L2(-) and L3(+) / L4(-) respectively.

[0075] The present embodiment also includes a video acquisition module, one end of which is connected to a camera and is used to collect real-time video signals of the operating status of two incoming circuit breakers and one connecting circuit breaker in the low-voltage power distribution system, and the other end of which communicates with the MCU and is used to transmit video processing results;

[0076] The video acquisition module will record video in a loop at a 1-minute interval during normal operation, and overwrite the previous video data after 1 minute.

[0077] When the MCU detects that the circuit breaker has a position change signal change, the video acquisition module marks the moment of position change as "time point 0", cuts the video information 1-10 seconds before and 1-10 seconds after the position change occurs, and generates a new video file with the cut video;

[0078] The newly generated video file is uploaded to the remote system through the 4G communication module as one of the criteria for the change of the state of the low-voltage power distribution system, and triggers an alarm signal to notify the system manager.

[0079] In this embodiment, the steps of switching to a backup power supply or starting a backup power supply device according to a voltage state; generating a voltage control signal for driving the operation of a circuit breaker, and providing power supply support for internal modules of the device and external devices are as follows:

[0080] The switched voltage signal is processed by the rectifier circuit and the step-down circuit to generate a DC voltage, which provides working power for the main control unit, 4G communication module, video acquisition module, and LCD display module of the device;

[0081] The switched voltage passes through the voltage switching module at the same time to generate AC220V and AC380V control power supply signals, which are used to drive the operating coils of the incoming circuit breaker and the connecting circuit breaker to realize the opening and closing operations of the circuit breaker.

[0082] In this embodiment, the test button 1 is electrically connected to the coils of the voltage relays KV1 and KV2 respectively; the voltage signals UA1 / UB1 / UC1 / UN1 and UA2 / UB2 / UC2 / UN2 of the two incoming power supplies are connected in series with the contacts of the two voltage relays after being connected from the device terminals, and are used as voltage sampling signals, device power supply and control power supply respectively;

[0083] After the device is installed, swing the incoming frame circuit breaker and the contact frame circuit breaker out to the test position for testing operations;

[0084] When the test button 1 is pressed, the voltage relay cuts off the input voltage signal, simulating the power failure state; when the test button 1 is released, the voltage signal is restored, simulating the power recovery state;

[0085] By operating the test button 1, the action logic of the low-voltage standby automatic transfer device under power failure and restoration conditions is verified, including voltage switching and circuit breaker opening and closing operations.

[0086] In this embodiment, each slave independently collects status information of its corresponding circuit breaker, including:

[0087] Voltage signal acquisition: The A-phase voltage, B-phase voltage, C-phase voltage and neutral line voltage signals UA, UB, UC, and UN on the power supply side of the circuit breaker are collected through the voltage sampling line, and the collected signals are transmitted to the voltage detection circuit of the slave for subsequent voltage status judgment and processing;

[0088] Current signal acquisition: The A-phase and C-phase current signals IA and IC of the circuit breaker are respectively acquired through the current sampling line, and the acquired signals are input into the current detection circuit of the slave machine to monitor the working current status of the circuit breaker;

[0089] Switching signal acquisition: The mechanical position signal of the circuit breaker is collected through the switching sampling line, including the opening, closing and position status information of the circuit breaker, and the collected signal is transmitted to the signal processing module of the slave machine to reflect the operating status of the circuit breaker in real time.

[0090] It should be noted that: 1. By designing a fast switch switching device and a lithium battery inside the low-voltage backup automatic transfer device, the low-voltage backup automatic transfer device can still work normally after one or two power supplies fail, without the need for UPS backup power assistance under the traditional solution;

[0091] 2 By setting up a 4G communication module inside the low-voltage standby automatic transfer device, the 4G communication module interacts with the device MCU data, and also actively reports the power failure and power restoration status of one power supply and two power supplies to the remote visualization management platform in two modes: scheduled reporting and change reporting; 2 single-bus unsegmented and 3 single-bus segmented frame circuit breaker position change signals; standby automatic transfer device automatic transfer and automatic recovery action signals; as well as conventional power supply voltage values, operating current values, etc.

[0092] 3. By uploading the backup automatic switching device to the cloud and actively reporting data, a real-time visual display of the low-voltage power distribution system is formed; and the video signal of 10 seconds before and after the state change of the low-voltage power distribution system is obtained through the network camera and the frame circuit breaker position change signal;

[0093] 4 The video signal of 10 seconds before and after the state change of the low-voltage power distribution system further refers to the video of 10 seconds before and after 10 seconds after the switch position change signal of the frame circuit breaker collected by the backup automatic transfer device, with the position change signal as time point 0, cutting the video of 10 seconds before and after as one of the bases for the state change of the low-voltage power distribution system;

[0094] The test button 1 is arranged inside the integrated or split low-voltage standby automatic transfer device. When the test button 1 is pressed and triggered, the voltage relay in the device cuts off the voltage signal on the power supply side, simulating the power supply voltage loss test standby automatic transfer device to trip the frame circuit breaker on the voltage loss side and close the busbar tie frame circuit breaker; when the test button 1 pops up and recovers, the voltage relay in the device connects the voltage signal on the power supply side, simulating the power supply recovery test standby automatic transfer device to trip the bus tie frame circuit breaker and close the power supply side frame circuit breaker, which is convenient for on-site testing; in the integrated automatic transfer device, the button 1 is arranged at the front end, and the wiring terminal 2 is arranged at the rear, and the liquid crystal display screen 3 is also arranged at the front.

[0095] The 6-way automatic switching device is equipped with two voltage sampling channels, which can quickly switch the two voltage sampling channels to supply power to the inside of the device and provide AC / DC power to the control circuit of the external low-voltage frame circuit breaker.

[0096] 7 The above-mentioned split-type automatic standby device consists of three parts, including a host installed in the low-voltage distribution system contact circuit breaker cabinet, and two slaves installed in the low-voltage distribution system incoming circuit breaker cabinet; one end of the slave is provided with 4 voltage sampling lines, 2 RS485 communication lines, and 2 12-24V power lines, which are electrically connected to the host; the other end is provided with 4 voltage sampling lines, 4 current sampling lines, 3 switch quantity sampling lines, and 3 relay output lines, which are respectively electrically connected to the A / B / C / N phase voltage, A / C current transformer, circuit breaker position, and circuit breaker opening and closing coil on the power supply side of the low-voltage distribution system incoming circuit breaker

[0097] The present invention is not limited to the above-mentioned embodiments. Anyone should be aware that any structural changes made under the enlightenment of the present invention, and any technical solutions that are the same or similar to the present invention, fall within the protection scope of the present invention. The technology, shape, and structural parts not described in detail in the present invention are all well-known technologies.

Claims

1. A method for realizing an intelligent low-voltage power distribution system, characterized in that: Based on the split-structure host and at least one or two slaves, combined with the voltage acquisition and switching module, device power module, LCD display module, video acquisition module, 4G communication module, and MCU main control unit, real-time monitoring and intelligent control of the low-voltage power distribution system are realized, which specifically includes the following steps: Collect the voltage signals of the two incoming power supplies as the input signals of the device, determine the power supply status through the voltage detection circuit, and switch to the backup power supply or start the backup power supply device according to the voltage status; generate voltage control signals to drive the operation of the circuit breaker and provide power support for the internal modules and external devices of the device; Establish a communication connection between the host and the slave. The host processes the circuit breaker status information collected by the slave, including voltage signals, current signals and switch signals, and generates circuit breaker operation instructions to pass to the slave to realize the opening and closing control of the circuit breaker; Monitor the system operation status, upload the operation parameters to the remote management platform through the data communication module, support real-time status monitoring and abnormal status alarm, and upload the data regularly or according to the operation requirements; The power state change is simulated by operating the test button (1) to verify the functional logic and operational reliability of the system, including power state detection, power switching, circuit breaker operation and operational monitoring functions.

2. The method for realizing an intelligent low-voltage power distribution system according to claim 1, characterized in that: One end of the slave 1 is provided with 4 voltage sampling lines UA1-1, UB1-1, UC1-1, UN1-1, 2 RS485 communication lines A1, B1, 2 12-24 volt power lines L1 (+), L2 (-), 2 control lines A1, C1, for connecting with the host; the other end is provided with 4 voltage sampling lines UA1, UB1, UC1, UN1, 4 current sampling lines IA1, IAN1, IC1, ICN1, 3 switch quantity sampling lines 1DLH, 1DLF, COM1, 3 relay output lines 1HDL, 1FDL, COM2, which are respectively electrically connected with the A / B / C / N phase voltage, A / C phase current transformer, circuit breaker position and circuit breaker opening and closing coil of the 1# incoming line circuit breaker of the low-voltage power distribution system; One end of the slave 2 is provided with 4 voltage sampling lines UA2-1, UB2-1, UC2-1, UN2-1, 2 RS485 communication lines A2, B2, 2 12-24 volt power lines L3 (+), L4 (-), and 2 control lines A2, C2, which are used to connect with the host; the other end is provided with 4 voltage sampling lines UA2, UB2, UC2, UN2, 4 current sampling lines IA2, IAN2, IC2, ICN2, 3 switch quantity sampling lines 2DLH, 2DLF, COM3, and 3 relay output lines 2HDL, 2FDL, COM4, ​​which are respectively electrically connected to the A / B / C / N phase voltage, A / C phase current transformer, circuit breaker position and circuit breaker opening and closing coil of the 2# incoming line breaker of the low-voltage distribution system.

3. The method for realizing an intelligent low-voltage power distribution system according to claim 1, characterized in that: When collecting the voltage signals of the two incoming power supplies, a voltage sampling application circuit is used, which includes: Two voltage sampling lines, the two voltage sampling lines respectively collect the A-phase, B-phase, C-phase and neutral line voltage signals of the two incoming power supplies. The first power supply collects signals through the voltage sampling lines UA1, UB1, UC1, and UN1, and the second power supply collects signals through the voltage sampling lines UA2, UB2, UC2, and UN2; A resistor voltage divider circuit, which is connected to the voltage sampling line and is used to divide the collected high voltage signal to ensure that the output signal is within a voltage range acceptable to the MCU; A voltage switching module is connected to two voltage sampling lines and is used to switch the sampling signal path according to the power supply status. When one power supply fails, it switches to another power supply. When both power supplies fail, it switches to the backup power supply. Two rectifier circuits, the two rectifier circuits are respectively connected to the two voltage signals and are used to rectify the voltage signals into direct current to supply power to subsequent circuits; Two step-down circuits, which are connected to the rectifier circuit and are used to step down the rectified DC voltage into a working voltage suitable for powering the MCU main control circuit and peripheral modules; A lithium battery charging and discharging module, which is connected to the rectifier circuit and the step-down circuit, is in a charging state when both power supplies are normal, and provides backup power for the MCU main control circuit and peripheral modules when both power supplies fail; The signal output module is used to output the voltage signal after the resistor voltage division process to the MCU, so as to judge whether the two power supplies are in the voltage or not voltage state.

4. The method for realizing an intelligent low-voltage power distribution system according to claim 1, characterized in that: The voltage signals of the two incoming power supplies are collected as the input signals of the device, the power supply status is judged by the voltage detection circuit, and the steps of switching to the backup power supply or starting the backup power supply device according to the voltage status are as follows: The voltage signals UA1 / UB1 / UC1 / UN1 and UA2 / UB2 / UC2 / UN2 of the two incoming power sources are collected through the voltage sampling lines, and the collected voltage signals are transmitted to the resistor voltage divider network to reduce the signal voltage to the adaptation range; After voltage division, the voltage signal is input to the voltage detection circuit, which transmits the signal to the MCU, which determines whether each power supply is in a voltage or no voltage state. When both power supplies are under pressure, the system maintains the current power supply state, one power supply provides power to the device, the backup power supply is in standby state, and the lithium battery is in charging state; When one power supply fails, the MCU sends a control signal, and the voltage switching module switches to another power supply. The backup power supply continues to power the system to ensure the operation of the equipment. When both power supplies fail, the MCU determines that both power supplies are in a no-voltage state, and the host provides device power to slave 1 and slave 2 through L1(+) / L2(-) and L3(+) / L4(-) respectively.

5. The method for realizing an intelligent low-voltage power distribution system according to claim 1, characterized in that: It also includes a video acquisition module, one end of which is connected to a camera for real-time acquisition of operating status video signals of two incoming circuit breakers and one connecting circuit breaker in the low-voltage power distribution system, and the other end of which communicates with the MCU for transmitting video processing results; The video acquisition module will record video in a loop at a 1-minute interval during normal operation, and overwrite the previous video data after 1 minute. When the MCU detects that the circuit breaker has a position change signal change, the video acquisition module marks the moment of position change as "time point 0", cuts the video information 1-10 seconds before and 1-10 seconds after the position change occurs, and generates a new video file with the cut video; The newly generated video file is uploaded to the remote system through the 4G communication module as one of the criteria for the change of the state of the low-voltage power distribution system, and triggers an alarm signal to notify the system manager.

6. The method for realizing an intelligent low-voltage power distribution system according to claim 1, characterized in that: Switch to the backup power supply or start the backup power supply device according to the voltage status; The steps of generating a voltage control signal for driving the operation of the circuit breaker and providing power support for the internal modules and external devices of the device are: The switched voltage signal is processed by the rectifier circuit and the step-down circuit to generate a DC voltage, which provides working power for the main control unit, 4G communication module, video acquisition module, and LCD display module of the device; The switched voltage passes through the voltage switching module at the same time to generate AC220V and AC380V control power supply signals, which are used to drive the operating coils of the incoming circuit breaker and the connecting circuit breaker to realize the opening and closing operations of the circuit breaker.

7. The method for realizing an intelligent low-voltage power distribution system according to claim 1, characterized in that: The test button (1) is electrically connected to the coils of the voltage relays KV1 and KV2 respectively; the voltage signals UA1 / UB1 / UC1 / UN1 and UA2 / UB2 / UC2 / UN2 of the two incoming power supplies are connected in series with the contacts of the two voltage relays after being connected from the device terminals, and are used as voltage sampling signals, device power supply and control power supply respectively; After the device is installed, swing the incoming frame circuit breaker and the contact frame circuit breaker out to the test position for testing operations; When the test button (1) is pressed, the voltage relay cuts off the input voltage signal, simulating a power failure state; when the test button (1) is released, the voltage signal is restored, simulating a power recovery state; By operating the test button (1), the action logic of the low-voltage standby automatic switching device under power failure and power recovery conditions is verified, including voltage switching and circuit breaker opening and closing operations.

8. The method for realizing an intelligent low-voltage power distribution system according to claim 1, characterized in that: Each slave independently collects the status information of its corresponding circuit breaker, including: Voltage signal acquisition: The A-phase voltage, B-phase voltage, C-phase voltage and neutral line voltage signals UA, UB, UC, and UN on the power supply side of the circuit breaker are collected through the voltage sampling line, and the collected signals are transmitted to the voltage detection circuit of the slave for subsequent voltage status judgment and processing; Current signal acquisition: The A-phase and C-phase current signals IA and IC of the circuit breaker are respectively acquired through the current sampling line, and the acquired signals are input into the current detection circuit of the slave machine to monitor the working current status of the circuit breaker; Switching signal acquisition: The mechanical position signal of the circuit breaker is collected through the switching sampling line, including the opening, closing and position status information of the circuit breaker, and the collected signal is transmitted to the signal processing module of the slave machine to reflect the operating status of the circuit breaker in real time.

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