Mining low-voltage feed comprehensive protection device

Abstract

The utility model provides a mining low-voltage feed comprehensive protection device, and belongs to the technical field of low-voltage feed protection. The problem that when an existing feed protection device is applied to a coal mine underground power supply system, safety is poor is solved. Comprising a shell, a display part is arranged on the front face of the shell, a comprehensive protector ZB is arranged in the shell, the comprehensive protector ZB adopts a PCB integrated with a controller, a storage, a power module, an AD module and a communication module, a 32-bit single-chip microcomputer serves as a core, an industrial-grade peripheral chip is supplemented, and the comprehensive protector ZB serves as a CPU unit for data acquisition, operation, processing and command output; a liquid crystal display screen, an LED indicating lamp, an external button and the like are used as a man-machine interaction unit to realize the functions of closing, opening, ascending, descending, short test and leakage test, the functions of detection, control, communication, protection, alarm and the like are integrated, various real-time data can be monitored, and reliable protection of the switch is realized; the utility model is applied to a low-voltage feed switch with the voltage class of 380V / 660V / 1140V and the rated current of 1000A.

Description

Technical Field

[0001] The utility model provides a low-voltage feeder comprehensive protection device for mining, belonging to the technical field of low-voltage feeder protection. Background Art

[0002] The feeder switch is a complete set of switchgear used in mines to connect and disconnect the normal current of the carrying line, and can connect and disconnect the abnormal current within a certain period of time under specified abnormal circuit conditions (such as short circuit), and has a clear break in the primary circuit. It is generally used as a distribution main switch, feeder switch or branch switch in power grids with a rated voltage of 1140V and below, and can also control large-capacity motors to start infrequently. The correct operation of the feeder switch is the key to ensuring the safe and stable operation of various electrical equipment in the mine. Therefore, a comprehensive protection device is generally provided to detect and control the working voltage, current, opening and closing of the feeder switch. However, this protection device cannot take into account the problems of overload, short circuit, undervoltage, overvoltage, etc. in the underground power supply system of coal mines, resulting in its poor safety. Utility Model Content

[0003] In order to solve the problem of poor safety when the current feeder protection device is applied to the coal mine underground power supply system, the utility model proposes a mine-used low-voltage feeder comprehensive protection device, the purpose of which is to achieve safe and stable operation of the coal mine underground power supply system and the feeder switch through hardware improvement or improvement of the combined connection of hardware modules and / or circuits.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a low-voltage feeder integrated protection device for mining, comprising a shell, a display part is arranged on the front of the shell, and a comprehensive protector ZB is arranged inside the shell. The comprehensive protector ZB adopts a PCB circuit board integrated with a controller, a memory, a power module, an AD module, and a communication module. The circuit structure of the periphery of the comprehensive protector ZB is as follows:

[0005] After the U, V, W three-phase outgoing terminals of the three-phase power supply are connected in series with the circuit breaker QF, current transformers CT1, CT2, and CT3 are connected in series to each phase line respectively. One end of the current transformers CT1, CT2, and CT3 is connected to the IN terminal of the integrated protector ZB, and the other end of the current transformers CT1, CT2, and CT3 is connected to the IA, IB, and IC terminals of the integrated protector ZB respectively. A zero-sequence transformer 0H is also connected to the U, V, and W three-phase lines after the circuit breaker QF. The signal end of the zero-sequence transformer 0H is connected to the zero-sequence The current signal input terminal is used to detect the zero-sequence current in the power supply system. At the same time, the three-phase reactor SK is also connected in parallel to the U, V, and W three-phase lines after the circuit breaker QF. The neutral point of the three-phase reactor SK is connected to the zero-sequence voltage transformer TB. The signal ends of the three-phase reactor SK and the zero-sequence voltage transformer TB are respectively connected to the signal input terminals of the integrated protector ZB. The negative pole of the zero-sequence voltage transformer TB is connected in series with the capacitor C1 and then grounded. A wire is connected to the line connecting the capacitor C1 and the zero-sequence voltage transformer TB and connected to the leakage detection terminal of the integrated protector ZB;

[0006] The U, V, and W three-phase lines after the circuit breaker QF are also connected in parallel with RC resistor-capacitor absorbers, wherein the W phase line after the circuit breaker QF is also connected in series with a leakage test resistor R2 and the normally open contact of the leakage test relay K1 is grounded;

[0007] The U and W phase power supply ends of the three-phase power supply inlet are connected to the power carrier communication port of the integrated protector ZB through the power line coupler. The V and W phase power supply ends of the three-phase power supply inlet are connected to the reversing switch ZK and then connected to one end of the transformer TV. The other end of the transformer TV outputs AC36V, AC127V, AC24V and AC7.5V voltages respectively. The line connecting the reversing switch ZK and the transformer TV is connected in series with a fuse FU0. The input end of the transformer TV can select AC660V or AC1140V power supply;

[0008] The live wire of the AC36V output voltage is connected in series with the fuse FU1 and then connected to the positive pole of the power supply of the pilot module XD. The neutral wire of the AC36V output voltage is connected to the negative pole of the power supply of the pilot module XD. The live wire after the fuse FU1 is connected to the leakage test button LS and the coil of the leakage test relay K1 and then connected to the neutral wire of the AC36V output voltage. The live wire of the AC127V output voltage is connected in series with the fuse FU2 and then connected to the positive pole of the power supply of the permanent magnet switch controller KZQ. The neutral wire of the AC127V output voltage is connected to the permanent magnet The negative pole of the power supply of the switch controller KZQ; the live wire of the AC24V output voltage is connected in series with the fuse FU3 and then connected to the positive pole of the 24V power supply of the integrated protector ZB, and the neutral wire of the AC24V output voltage is connected to the negative pole of the 24V power supply of the integrated protector ZB; the live wire of the AC7.5V output voltage is connected in series with the fuse FU4, the overcurrent test resistor R1, and the overcurrent test button GS and then connected to the NC terminal of the integrated protector ZB, and the neutral wire of the AC7.5V output voltage is connected to the grounding terminal of the integrated protector ZB;

[0009] The integrated protector ZB is also connected with wind power input, gas input, switch status, remote shunt signal, reset, confirm, up, down buttons, communication closing signal and control output signal;

[0010] The permanent magnet switch controller KZQ is also connected to the communication closing switch and the control output switch to realize remote communication closing and control output;

[0011] The pilot module XD is also connected to the opening and closing buttons of the low-voltage feeder switch and the remote opening and closing buttons.

[0012] The display part includes an LCD display screen and a fault indicator light, a power indicator light, an opening indicator light, a closing indicator light and a communication indicator light.

[0013] The comprehensive protector ZB is used in conjunction with a low-voltage feeder switch with a voltage level of 380V / 660V / 1140V and a rated current of 1000A.

[0014] The CPU of the integrated protector ZB adopts a 32-bit single-chip microcomputer, specifically a STM32F103RBT6 model controller. Pins 14-17 of the controller are respectively connected to the output voltage terminals A, B, C, and N of the three-phase reactor SK, pins 20-22 of the controller are respectively connected to the output current terminals of the current transformers connected in series on the U, V, and W three-phase power lines, pins 51-53 of the controller are respectively connected to the communication closing, protection control, and remote leakage switch signals, pin 26 of the controller is connected to the remote shunt switch signal, pin 27 of the controller is connected to the switch status signal, pins 56-59 of the controller are respectively connected to the opening indicator light, the closing indicator light, the fault indicator light, and the communication indicator light, pin 61 of the controller is connected to the control power supply abnormality indicator light, pins 29-30 of the controller are respectively connected to the gas lockout input and the wind power lockout signal, and pins 33-36 of the controller are respectively connected to the down, up, confirmation, and reset buttons.

[0015] The LCD display screen adopts a 4×8 Chinese character type liquid crystal display screen, and the model is CH12864.

[0016] The beneficial effects of the utility model compared to the prior art are as follows: the comprehensive protection device of the utility model can improve the safety and reliability of the power supply system underground in a coal mine, integrates detection, control, communication, protection, alarm and other functions, can monitor various real-time data, realize reliable protection of switches, better adapt to the working environment underground in the mine, and further reduce the risk of underground operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model is further described below in conjunction with the accompanying drawings:

[0018] Figure 1 This is the peripheral wiring diagram of the comprehensive protection device of the utility model;

[0019] Figure 2 This is the circuit schematic diagram of the CPU part of the comprehensive protector of the utility model. DETAILED DESCRIPTION

[0020] like Figure 1-2As shown, the utility model provides a low-voltage feeder integrated protection device for mining, including a housing, a display part is arranged on the front of the housing, and a comprehensive protector ZB with a 32-bit single-chip microcomputer as the core and supplemented by an industrial-grade peripheral chip is arranged inside the housing. The comprehensive protector ZB adopts a PCB circuit board integrated with a controller, a memory, a power module, an AD module, and a communication module, and integrates detection, control, communication, events, protection and other functions. It can be used in conjunction with a low-voltage feeder switch with a voltage level of 380V / 660V / 1140V and a rated current of 1000A. The latest 128 historical fault records can be queried, and the fault information will automatically pop up and the fault light will be lit when a fault occurs. The event data is stored locally and will not be lost when the power is off, and can be queried at any time.

[0021] The integrated protector ZB is equipped with buttons such as "Up", "Down", "Confirm", and "Reset". The "Up", "Down", and "Confirm" buttons are used to select menu items and adjust parameters; the "Confirm" button is used to enter the menu, and is used in conjunction with the "Up" and "Down" buttons to set parameters. The "Reset" button has return and reset functions. The reset function is a function key that restores the low-voltage feeder switch to a normal protection state in the event of a protector failure. The return button is a function key that returns to the main interface in the parameter setting interface. When in use, the above buttons can be connected to the door panel of the explosion-proof housing of the low-voltage feeder switch through wires, and the corresponding operations can be performed on the door panel later.

[0022] The display of the integrated protection device includes a 4×8 Chinese character LCD display with backlight function, 1 yellow fault light, 1 green power light, 1 green opening light, 1 red closing light and 1 green communication indicator light. In normal operation, the display screen will simultaneously display the three-phase working current value and the grid voltage value. During setting, various menus, various setting parameter values, fault parameter values ​​and test results can be displayed by pressing buttons. In normal operation, the fault indicator light is off and the power indicator light is on. If the switch is in the closed state, the closing indicator light is on. When the protector finds a fault (such as undervoltage, overload, etc.), the protector trips and the yellow fault light is on.

[0023] The utility model uses an LCD display screen and LED indicator lights to realize the functions of closing, opening, up, down, short test and leakage test, etc. as a human-machine interaction unit. The LCD display screen can display real-time information such as three-phase voltage and current, insulation resistance, electricity metering, switch status, etc.

[0024] The integrated protector ZB can quickly sample the collected analog and switch quantities and complete various calculations and processing, and display them on the spot in real time; when a fault occurs, it can determine the tripping time according to the nature of the fault, and memorize the relevant parameters of the fault for easy query, and can also communicate with the entire monitoring system through the RS485 or CAN bus communication interface, so as to realize the safe, reliable and stable operation of the integrated protection device.

[0025] The comprehensive protection device of the utility model also provides system communication function, transmitting real-time system three-phase current, system voltage, insulation resistance, switch position and other data; device address: value range 1~255. In order to distinguish different devices, communication rate (baud rate): 0: 1200, 1: 2400, 2: 4800, 3: 9600, 4: 19200, 5: 38400, 6: 57600, 7: 115200 and other adjustable, when communicating with the host computer, select the same baud rate as the host computer, communication check: 0: no check; 1: odd check; 2: even check.

[0026] According to the following Figure 1 The wiring principle of the comprehensive protection device of the utility model is explained.

[0027] like Figure 1 As shown, after the U, V, W three-phase outgoing terminals of the three-phase power supply are connected in series with the circuit breaker QF, current transformers CT1, CT2, CT3 are connected in series to each phase line respectively, one end of the current transformers CT1, CT2, CT3 is connected to the IN terminal of the integrated protector ZB, and the other ends of the current transformers CT1, CT2, CT3 are connected to the IA, IB, IC terminals of the integrated protector respectively. A zero-sequence transformer 0H is also connected to the U, V, W three-phase lines after the circuit breaker QF, and the signal end of the zero-sequence transformer 0H is connected to the zero-sequence current signal input terminal of the integrated protector ZB through a wire. All the live wires pass through the inner hole of the zero-sequence transformer 0H, and the vector sum of the three-phase currents, namely the zero-sequence current, is measured. At the same time, the three-phase reactor SK is also connected in parallel on the U, V, and W three-phase lines after the circuit breaker QF. The neutral point of the three-phase reactor SK is connected to the zero-sequence voltage transformer TB. The signal ends of the three-phase reactor SK and the zero-sequence voltage transformer TB are respectively connected to the signal input terminals of the integrated protector ZB. The negative pole of the zero-sequence voltage transformer TB is connected in series with the capacitor C1 and then grounded. A wire is taken out from the line connecting the capacitor C1 and the zero-sequence voltage transformer TB and connected to the leakage detection terminal of the integrated protector ZB.

[0028] The U, V, and W three-phase lines after the circuit breaker QF are also connected in parallel with RC resistor-capacitor absorbers, and the W-phase line after the circuit breaker QF is also connected in series with a leakage test resistor R2 and the normally open contact of the leakage test relay K1, which is then grounded. The RC resistor-capacitor absorber can effectively suppress the instantaneous oscillation and high-frequency current of the operating overvoltage, slow down the waveform of the overvoltage, reduce the steepness and amplitude, and with the damping effect of the resistor, the high-frequency oscillation is rapidly attenuated.

[0029] The U and W phase power supply ends of the three-phase power supply incoming line are connected to the power carrier communication port of the integrated protector ZB through the power line coupler. The V and W phase power supply ends of the three-phase power supply incoming line are connected to the reversing switch ZK and then connected to one end of the transformer TV. The other end of the transformer TV outputs AC36V, AC127V, AC24V and AC7.5V voltages respectively. The line connecting the reversing switch ZK and the transformer TV is connected in series with a fuse FU0. The input end of the transformer TV can select AC660V or AC1140V power supply.

[0030] The live wire of the AC36V output voltage is connected in series with the fuse FU1 and then connected to the positive pole of the power supply of the pilot module XD. The neutral wire of the AC36V output voltage is connected to the negative pole of the power supply of the pilot module XD. The live wire after the fuse FU1 is connected to the leakage test button LS and the coil of the leakage test relay K1 and then connected to the neutral wire of the AC36V output voltage. The live wire of the AC127V output voltage is connected in series with the fuse FU2 and then connected to the positive pole of the power supply of the permanent magnet switch controller KZQ. The neutral wire of the AC127V output voltage is connected to the permanent magnet The negative pole of the power supply of the switch controller KZQ; the live wire of the AC24V output voltage is connected in series with the fuse FU3 and then connected to the positive pole of the 24V power supply of the integrated protector ZB, and the neutral wire of the AC24V output voltage is connected to the negative pole of the 24V power supply of the integrated protector ZB; the live wire of the AC7.5V output voltage is connected in series with the fuse FU4, the overcurrent test resistor R1, and the overcurrent test button GS and then connected to the NC terminal of the integrated protector ZB, and the neutral wire of the AC7.5V output voltage is connected to the grounding terminal of the integrated protector ZB.

[0031] Among them, the overcurrent test resistor R2 has a current limiting function. When the overcurrent test button GS is closed, the current increases, and the integrated protector ZB fails and trips, thereby simulating an overcurrent test; the leakage test resistor R1 has a current limiting function. When the leakage test button LS is closed, the coil of the leakage test relay K1 is energized, the normally open contact of the leakage test relay K1 is normally closed, the main circuit is grounded, and the integrated protector ZB detects a decrease in the insulation resistance value between the circuits and reports leakage protection, thereby simulating a leakage test.

[0032] The integrated protector ZB is also connected with wind power input, gas input, switch status, remote shunt signal, reset, confirm, up and down buttons, communication closing signal and control output signal.

[0033] The permanent magnet switch controller KZQ is also connected to the communication closing switch and the control output switch to realize remote communication closing and control output.

[0034] The pilot module XD is also connected with the opening and closing buttons of the low-voltage feeder switch as well as the remote opening and remote closing buttons.

[0035] The CPU of the integrated protector ZB adopts a 32-bit single-chip microcomputer, specifically a STM32F103RBT6 controller. Pins 14-17 of the controller are respectively connected to the output voltage terminals A, B, C, and N of the three-phase reactor SK, pins 20-22 of the controller are respectively connected to the output current terminals of the current transformers connected in series on the U, V, and W three-phase power lines, pins 51-53 of the controller are respectively connected to the communication closing, protection control, and remote leakage switch signals, pin 26 of the controller is connected to the remote shunt switch signal, pin 27 of the controller is connected to the switch status signal, pins 56-59 of the controller are respectively connected to the opening indicator light, closing indicator light, fault indicator light, and communication indicator light, pin 61 of the controller is connected to the control power supply abnormality indicator light, pins 29-30 of the controller are respectively connected to the gas interlock and wind power interlock signals, and pins 33-36 of the controller are respectively connected to the down, up, confirmation, and reset buttons.

[0036] The main components used in this utility model are selected as follows:

[0037] Pilot module XD model: JAXD-3; zero-sequence transformer 0H model: LZZBJ9L-35 / 50; zero-sequence voltage transformer TB model: KBZ zero-sequence voltage transformer; permanent magnet vacuum circuit breaker QF model: ZN7-1.14 / 400Y3; three-phase reactor SK model: SK-100G 1140V / Y-100V / Y; current transformer CT1-CT3 model: BH-0.66 40I 400 / 5A; reversing switch ZK model: LW5-16 / 1G; transformer TV model: BKC-320VA model; permanent magnet switch controller KZQ model: JT430 model.

[0038] The utility model is mainly used in the power grid of industrial system with AC 50Hz and rated voltage of 380V / 660V / 1140V. There are two control modes: local control through button operation; and remote control through RS485 and CAN communication to check and adjust various data.

[0039] The comprehensive protection device of the utility model has reliable and sensitive protection and high measurement accuracy; the PCB circuit board of the comprehensive protector ZB has been treated with three-proof paint and high temperature, so that the comprehensive protector ZB has extremely high anti-interference ability; standardized and modular hardware design, high-precision A / D conversion; RS485 and power carrier communication technology are adopted; high-reliability memory is used to store important data such as protection settings, system parameters and event records to ensure that power is not lost; the utility model organically integrates automation technology and mining power supply equipment technology to ensure the reliable, safe and efficient realization of the above functions.

[0040] Regarding the specific structure of the utility model, it should be explained that the connection relationship between the various component modules adopted in the utility model is definite and feasible. Except for special instructions in the embodiments, the specific connection relationship can bring corresponding technical effects and solve the technical problems raised by the utility model without relying on the execution of corresponding software programs. The components, modules, models of specific components and the connection methods between each other appearing in the utility model, as well as the conventional use methods and expected technical effects brought about by the above-mentioned technical features, except for specific instructions, all belong to the disclosed contents in patents, journal articles, technical manuals, technical dictionaries, and textbooks that can be obtained by technical personnel in this field before the application date, or belong to the existing technologies such as conventional technologies and common knowledge in this field, and there is no need to elaborate, so that the technical solution provided in this case is clear, complete and feasible, and the corresponding physical products can be reproduced or obtained according to the technical means.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A low-voltage feeder integrated protection device for mines, characterized in that: It includes a housing, a display part is arranged on the front of the housing, a comprehensive protector ZB is arranged inside the housing, and the comprehensive protector ZB adopts a PCB circuit board integrated with a controller, a memory, a power module, an AD module, and a communication module. The circuit structure of the periphery of the comprehensive protector ZB is as follows: After the U, V, W three-phase outgoing terminals of the three-phase power supply are connected in series with the circuit breaker QF, current transformers CT1, CT2, and CT3 are connected in series to each phase line respectively. One end of the current transformers CT1, CT2, and CT3 is connected to the IN terminal of the integrated protector ZB, and the other end of the current transformers CT1, CT2, and CT3 is connected to the IA, IB, and IC terminals of the integrated protector ZB respectively. A zero-sequence transformer 0H is also connected to the U, V, and W three-phase lines after the circuit breaker QF. The signal end of the zero-sequence transformer 0H is connected to the zero-sequence The current signal input terminal is used to detect the zero-sequence current in the power supply system. At the same time, the three-phase reactor SK is also connected in parallel to the U, V, and W three-phase lines after the circuit breaker QF. The neutral point of the three-phase reactor SK is connected to the zero-sequence voltage transformer TB. The signal ends of the three-phase reactor SK and the zero-sequence voltage transformer TB are respectively connected to the signal input terminals of the integrated protector ZB. The negative pole of the zero-sequence voltage transformer TB is connected in series with the capacitor C1 and then grounded. A wire is connected to the line connecting the capacitor C1 and the zero-sequence voltage transformer TB and connected to the leakage detection terminal of the integrated protector ZB; An RC resistor-capacitor absorber is also connected in parallel on the U, V, and W three-phase lines after the circuit breaker QF, wherein a leakage test resistor R2 is also connected in series on the W phase line after the circuit breaker QF, and the normally open contact of the leakage test relay K1 is then grounded; The U and W phase power supply ends of the three-phase power supply inlet are connected to the power carrier communication port of the integrated protector ZB through the power line coupler. The V and W phase power supply ends of the three-phase power supply inlet are connected to the reversing switch ZK and then connected to one end of the transformer TV. The other end of the transformer TV outputs AC36V, AC127V, AC24V and AC7.5V voltages respectively. The line connecting the reversing switch ZK and the transformer TV is connected in series with a fuse FU0. The input end of the transformer TV can select AC660V or AC1140V power supply; The live wire of the AC36V output voltage is connected in series with the fuse FU1 and then connected to the positive pole of the power supply of the pilot module XD. The neutral wire of the AC36V output voltage is connected to the negative pole of the power supply of the pilot module XD. The live wire after the fuse FU1 is connected to the leakage test button LS and the coil of the leakage test relay K1 and then connected to the neutral wire of the AC36V output voltage. The live wire of the AC127V output voltage is connected in series with the fuse FU2 and then connected to the positive pole of the power supply of the permanent magnet switch controller KZQ. The neutral wire of the AC127V output voltage is connected to the permanent magnet The negative pole of the power supply of the switch controller KZQ; the live wire of the AC24V output voltage is connected in series with the fuse FU3 and then connected to the positive pole of the 24V power supply of the integrated protector ZB, and the neutral wire of the AC24V output voltage is connected to the negative pole of the 24V power supply of the integrated protector ZB; the live wire of the AC7.5V output voltage is connected in series with the fuse FU4, the overcurrent test resistor R1, and the overcurrent test button GS and then connected to the NC terminal of the integrated protector ZB, and the neutral wire of the AC7.5V output voltage is connected to the grounding terminal of the integrated protector ZB; The integrated protector ZB is also connected with wind power input, gas input, switch status, remote shunt signal, reset, confirm, up, down buttons, communication closing signal and control output signal; The permanent magnet switch controller KZQ is also connected to the communication closing switch and the control output switch to realize remote communication closing and control output; The pilot module XD is also connected to the opening and closing buttons of the low-voltage feeder switch and the remote opening and closing buttons.

2. A low-voltage feeder integrated protection device for mines according to claim 1, characterized in that: The display part includes an LCD display screen and a fault indicator light, a power indicator light, an opening indicator light, a closing indicator light and a communication indicator light.

3. A low-voltage feeder integrated protection device for mines according to claim 1, characterized in that: The comprehensive protector ZB is used in conjunction with a low-voltage feeder switch with a voltage level of 380V / 660V / 1140V and a rated current of 1000A.

4. A low-voltage feeder integrated protection device for mines according to claim 1, characterized in that: The CPU of the integrated protector ZB adopts a 32-bit single-chip microcomputer, specifically a STM32F103RBT6 model controller. Pins 14-17 of the controller are respectively connected to the output voltage terminals A, B, C, and N of the three-phase reactor SK, pins 20-22 of the controller are respectively connected to the output current terminals of the current transformers connected in series on the U, V, and W three-phase power lines, pins 51-53 of the controller are respectively connected to the communication closing, protection control, and remote leakage switch signals, pin 26 of the controller is connected to the remote shunt switch signal, pin 27 of the controller is connected to the switch status signal, pins 56-59 of the controller are respectively connected to the opening indicator light, the closing indicator light, the fault indicator light, and the communication indicator light, pin 61 of the controller is connected to the control power supply abnormality indicator light, pins 29-30 of the controller are respectively connected to the gas lockout input and the wind power lockout signal, and pins 33-36 of the controller are respectively connected to the down, up, confirmation, and reset buttons.

5. A low-voltage feeder integrated protection device for mining according to claim 2, characterized in that: The LCD display screen adopts a 4×8 Chinese character type liquid crystal display screen, and the model is CH12864.

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