Comprehensive protection device for mining low-voltage starter

Abstract

The utility model provides a comprehensive protection device for a mining low-voltage starter, and belongs to the technical field of starter protection. The problems that a conventional motor control mode is adopted for water pump control of a drainage point under a mine, safety is poor, and the control mode is not flexible are solved. Comprising a shell, a display screen and a plurality of indicator lamps are arranged on the front face of the shell, a control circuit board of an integrated controller is arranged in the shell, a 32-bit single-chip microcomputer serves as the core of the circuit board, an industrial-grade peripheral chip is supplemented, and three control modes including local control, network control and water level control are achieved; a complete hardware self-checking function and a hardware fault automatic locking protection function enable the device to be in a normal working state all the time; the high-reliability memory is used for storing important data such as protection constant values, system parameters and event records to ensure that the important data are not lost during power failure; the circuit board adopts a multi-layer surface mounting technology, so that the circuit volume is reduced, the heating is reduced, and the reliability of the device is improved; the utility model is applied to the low-voltage starter.

Description

Technical Field

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

[0002] In the power supply of mine drainage points, due to the harsh working environment underground, humid air, large load fluctuations, and easy aging of electrical equipment and power supply line insulation, leakage, short circuit, overload, phase loss, overvoltage, undervoltage and other phenomena will occur. If not discovered and handled in time, serious accidents will occur. Considering the safe operation of coal mines, the power supply equipment currently used underground generally provides a protector to protect various equipment. The low-voltage starter is a device used to control the start and stop of the three-phase asynchronous motor in the mine. At present, the protection device for the low-voltage starter can generally only realize the detection of leakage, short circuit, overload, phase loss, overvoltage, and undervoltage, and cannot realize its remote operation. Especially for the water pump control of the drainage point, the conventional motor control method is still used, which has poor safety and inflexible control method. Utility Model Content

[0003] In response to the above technical problems, the utility model provides an improvement in the hardware structure of a comprehensive protection device for a low-voltage starter for mining, which can operate safely, reliably and stably and can send the electrical parameters, operating parameters, power information, equipment operating conditions and fault information of the water pump motor at the underground drainage point to the dispatching center, and can also receive remote control, set value setting and other commands issued by the dispatching center to realize remote operation.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a comprehensive protection device for a low-voltage starter for mining, comprising a shell, a display screen and a plurality of indicator lights are arranged on the front of the shell, a control circuit board of an integrated controller is arranged inside the shell, the input end of the circuit board is connected to the AC33V output end of the transformer T1, the AC33V output end of the transformer T1 is also connected in parallel with ports 14 and 15 of an intrinsically safe plug-in to power the intrinsically safe plug-in, the AC36V neutral line of the transformer T1 is connected in series with the fuse FU2 and then connected to port 12 of the intrinsically safe plug-in, the AC36V live line of the transformer T1 is connected in parallel with one end of the emergency stop button and one end of the coil KA, the other end of the emergency stop button is connected in series with the coil KM1, the locking contact, and the communication closing contact and then connected to port 12 of the intrinsically safe plug-in, the other end of the coil KA is connected in parallel with the wire connected to the locking contact and the start button and then connected to port 11 of the intrinsically safe plug-in; port 1 of the intrinsically safe plug-in is connected in series with one end of the button SY1, port 2 of the intrinsically safe plug-in is connected in series with one end of the button SB1, and port 3 of the intrinsically safe plug-in is connected in series with the auxiliary normally open contact KM 1-3Then connect the other end of button SB1, one end of button SB2, the other end of button SY1, and one end of button SY2 in parallel. The other end of button SB2 is connected to port 8 of the intrinsically safe plug-in. The other end of button SY2 is connected to port 7 of the intrinsically safe plug-in after connecting a diode in series.

[0005] The input end of the transformer T1 is connected to the U and W phase lines of the output end of the isolation phase-changing switch QS, wherein the neutral line of the multi-winding transformer T1 is connected in series with the fuse FU1 and then connected to the W phase of the output end of the isolation phase-changing switch QS, and the U phase of the output end of the isolation phase-changing switch QS can be switched to input 380V, 660V, and 1140V AC, the input end of the isolation phase-changing switch QS is connected to a three-phase power supply, and the three-phase power supply of the output end of the isolation phase-changing switch QS is connected in series with the vacuum contactor KM1 and the current transformer TA, and the three-phase current signal output ends of the current transformer TA are respectively connected to the three-phase current acquisition signal terminals on the circuit board;

[0006] The three-phase power line at the output end of the isolating phase-changing switch QS is connected in parallel with an RC resistor-capacitor absorption device;

[0007] The positive electrode of the diode D1 is connected in parallel to the output terminal W of the isolating phase-changing switch QS, and the negative electrode of the diode D1 is connected in series to the auxiliary normally closed contact KM. 1-2 , Auxiliary normally closed contact KA 1-2 , Auxiliary normally closed contact KA 1-4 Then connect to the leakage input terminal of the circuit board;

[0008] The circuit board is also provided with a short circuit test port and a leakage test port;

[0009] The operating status 1 port on the circuit board is connected in series with the normally open auxiliary contact KM 1-1 , normally open auxiliary contact KM 1-1 The other end is connected to the common end of the circuit board, and the circuit board is also connected with four buttons: up, down, confirm, and reset;

[0010] The circuit board is also provided with an RS485 communication port and an infrared remote control receiving module, and is also provided with a temperature detection port, an analog input port, a water flow switch port, a high and low water level control port, a wind power interlock port, a gas interlock port and a far and near control status port.

[0011] The controller on the circuit board uses a 32-bit single-chip microcomputer, specifically a STM32F103RCT6 controller, and its circuit connection is as follows:

[0012] Pin 14 of the controller is connected to the motor temperature detection sensor circuit, pin 15 of the controller is connected to the infrared module, pins 16 / 17 / 20 of the controller are respectively connected to the A, B, and C three-phase current output terminals of the current transformer TA through the operational amplifier circuit, pin 23 of the controller is connected to the liquid level sensor circuit, wherein the liquid level sensor is arranged at the drainage point for detecting the water level at the drainage point, pin 50 of the controller is connected to the ambient temperature and humidity sensor circuit for detecting the ambient temperature and humidity in the mine, pin 8 of the controller is connected to the water pressure sensor circuit, and the water pressure sensor is used to detect the pressure in the drainage pipe, and pins 9 / 10 / 11 / 24 of the controller are respectively connected to the closing indicator light, the opening indicator light, the communication indicator light, and the fault indicator light through the photoelectric coupler and the electronic circuit. The 25 / 37 / 38 pins of the controller are respectively connected to the forward control relay, the reverse control relay, and the leakage input relay through the electronic circuit, the 39 / 40 / 51 / 52 pins of the controller are respectively connected to the short-circuit test relay, the leakage test relay, the leakage lockout relay and the online output relay circuit, the 55 pin of the controller is connected to the flow switch circuit, the 56 / 57 / 58 / 59 pins of the controller are respectively connected to the far and near state feedback, the operation state 1 feedback, the operation state 2 feedback, and the online input lockout signal circuit, the 61 / 62 / 29 / 30 pins of the controller are respectively connected to the wind power lockout input, the gas lockout input, the high water level and the low water level signal circuit, the 33-36 pins of the controller are respectively connected to the down, up, confirmation and reset buttons through the photoelectric coupler and the electronic circuit pins.

[0013] Buttons SB1 and SB2 are the start and stop buttons for local control, and buttons SY1 and SY2 are the start and stop buttons for remote control.

[0014] The protection device has three control modes: local, remote and water level. The local control mode is controlled by local start and stop buttons. The remote control mode receives signals from the host computer through the RS485 interface to control the remote start and stop buttons to achieve remote control, or receives infrared signals emitted by an infrared remote controller to control the remote start and stop buttons to achieve remote control. The water level control mode is used to automatically start and stop the water pump at the drainage point. When the water level sensor detects a high water level, the motor is automatically started to drain the water. When the water level sensor detects a low water level, the motor is automatically stopped to stop draining the water.

[0015] The U-phase incoming line terminal of the three-phase power supply is connected in parallel to one end of the capacitor, the other end of the capacitor is connected to the positive pole of the power line coupler, the negative pole of the power line coupler is connected in parallel to the W-phase incoming line terminal of the three-phase power supply, and the output end of the power line coupler is directly connected to the carrier communication port on the circuit board.

[0016] The intrinsically safe plug-in adopts a JAXD-3 pilot module.

[0017] The infrared module adopts the infrared receiving tube of the F5PT333-3B model.

[0018] Compared with the prior art, the utility model has the following beneficial effects: the utility model takes a 32-bit single-chip microcomputer as the core, supplemented by an industrial-grade peripheral chip, with reliable and sensitive protection and high measurement accuracy; the complete hardware self-check function and hardware fault automatic locking protection function keep the device in normal working state, improving the reliability and safety of protection; it has three control modes: local control, remote (network) control and water level control. In order to facilitate user operation, it can achieve unattended operation around the clock. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The utility model is further described below in conjunction with the accompanying drawings:

[0020] Figure 1 This is a schematic diagram of the housing structure of the protection device of the utility model;

[0021] Figure 2 This is the peripheral wiring diagram of the protection device of the utility model;

[0022] Figure 3 This is the circuit schematic diagram of the CPU part in the protection device of the utility model;

[0023] In the figure: 1 is a housing, 2 is a display screen, and 3 is an indicator light. DETAILED DESCRIPTION

[0024] like Figure 1-3 As shown, the utility model provides a comprehensive protection device for a low-voltage starter for mining, comprising a shell 1, a display screen 2 and five indicator lights 3 of fault, opening, infrared, closing and power supply are arranged on the front of the shell 1, and the protection device is installed in the flameproof cavity of the flameproof feeder switch when in use, and only the 485 communication line needs to be connected to the outside of the flameproof feeder switch, and at the same time, a flameproof window and eight buttons of "closing", "opening", "pass test", "leak test", "up", "down", "confirm" and "reset" led out from the protection device are arranged on the front of the flameproof shell of the switch, and the display screen 2 and the indicator lights 3 of the protection device can be observed through the flameproof window; the display screen 2 can adopt a 4.3-inch LCD screen.

[0025] A control circuit board with an integrated controller is arranged inside the housing 1 of the protection device, supplemented by industrial-grade peripheral chips, with high measurement accuracy; the circuit board adopts multi-layer surface mounting technology, which reduces the circuit volume, reduces heat, and improves the reliability of the device; the circuit board is also integrated with a high-reliability memory for storing important data such as protection settings, system parameters and event records to ensure that power is not lost; the protection device is equipped with a complete hardware self-test function and a hardware fault automatic locking protection function, so that the explosion-proof switch is always in normal working condition; and the control circuit board has passed three-proof paint and high-temperature treatment, and has significant advantages in vibration resistance, interference resistance, corrosion resistance, safety, stability, low power consumption and other aspects.

[0026] like Figure 2 As shown, the peripheral wiring circuit of the protection device proposed by the utility model is as follows:

[0027] The power input end of the circuit board is connected to the AC33V output end of the multi-winding transformer T1. The AC33V output end of the multi-winding transformer T1 is also connected in parallel with the 14th and 15th ports of the intrinsically safe plug-in to power the intrinsically safe plug-in. The AC36V neutral line of the multi-winding transformer T1 is connected in series with the fuse FU2 and then connected to the 12th port of the intrinsically safe plug-in. The AC36V live line of the multi-winding transformer T1 is connected in parallel with one end of the emergency stop button and one end of the coil KA. The other end of the emergency stop button is connected in series with the coil KM1, the locking contact, and the starting contact (communication closing contact) and then connected to the 12th port of the intrinsically safe plug-in. The other end of the coil KA is connected in parallel with the wire connected to the locking contact and the starting contact (communication closing contact) and then connected to the 11th port of the intrinsically safe plug-in. Port 1 of the intrinsically safe plug-in is connected in series with one end of the button SY1, port 2 of the intrinsically safe plug-in is connected in series with one end of the button SB1, and port 3 of the intrinsically safe plug-in is connected in series with the auxiliary normally open contact KM1. 1-3 Then connect the other end of button SB1, one end of button SB2, the other end of button SY1, and one end of button SY2 in parallel. The other end of button SB2 is connected to port 8 of the intrinsically safe plug-in. The other end of button SY2 is connected in series with a diode and then connected to port 7 of the intrinsically safe plug-in. Among them, buttons SB1 and SB2 are the start and stop buttons for local control, and buttons SY1 and SY2 are the start and stop buttons for remote control.

[0028] The input end of the multi-winding transformer T1 is connected to the U and W phase lines of the output end of the isolation phase-changing switch QS, wherein the neutral line of the multi-winding transformer T1 is connected in series with the fuse FU1 and then connected to the W phase of the output end of the isolation phase-changing switch QS. The U phase of the output end of the isolation phase-changing switch QS can switch to input 380V, 660V, and 1140V AC. The input end of the isolation phase-changing switch QS is connected to a three-phase power supply, and the three-phase power supply of the output end of the isolation phase-changing switch QS is connected in series with a vacuum contactor KM1 and a current transformer TA. The three-phase current signal output ends of the current transformer TA are respectively connected to the three-phase current acquisition signal terminals on the circuit board; an RC resistor-capacitor absorption device is connected in parallel to the three-phase power supply line of the output end of the isolation phase-changing switch QS; the positive electrode of the diode D1 is connected in parallel to the W phase line of the output end of the isolation phase-changing switch QS, and the negative electrode of the diode D1 is connected in series with the auxiliary normally closed contact KM 1-2 , Auxiliary normally closed contact KA 1-2 , Auxiliary normally closed contact KA 1-4 Then connect it to the leakage input terminal of the circuit board.

[0029] The coil KA is used for main circuit leakage lockout. After the starter is closed, the coil KA is energized, making the auxiliary normally closed contact KA 1-2 , Auxiliary normally closed contact KA 1-4 After the starter is disconnected, the coil KA loses power, causing the auxiliary normally closed contact KA 1-2 , Auxiliary normally closed contact KA 1-4 In the closed and open states, the insulation resistance between the three-phase power supply line and the motor winding to ground is detected. When the insulation resistance value drops to the specified value, the starter is locked so that it cannot be closed and power is supplied.

[0030] The U-phase incoming line terminal of the three-phase power supply is connected in parallel to one end of the capacitor, the other end of the capacitor is connected to the positive pole of the power line coupler, the negative pole of the power line coupler is connected in parallel to the W-phase incoming line terminal of the three-phase power supply, and the output end of the power line coupler is directly connected to the carrier communication port on the circuit board.

[0031] The circuit board is also equipped with a short circuit test port and a leakage test port; the operation status 1 port on the circuit board is connected in series with a normally open auxiliary contact KM 1-1 , normally open auxiliary contact KM 1-1 The other end is connected to the common end of the circuit board, and the circuit board is also connected to four buttons: "Up", "Down", "Confirm" and "Reset".

[0032] The circuit board is also equipped with an RS485 communication port and an infrared remote control receiving module, which can realize infrared remote control remote operation; and the circuit board is also equipped with a temperature detection port, an analog input port, a water flow switch port, a high and low water level control port, a wind power interlock port, a gas interlock port and a far and near control status port.

[0033] The controller on the circuit board uses a 32-bit single-chip microcomputer, which realizes the signal processing and calculation judgment of the collected opening quantity or analog quantity. Figure 3 As shown, a controller of the STM32F103RCT6 model is specifically used, the 14th pin of the controller is connected to the motor temperature detection sensor circuit, the 15th pin of the controller is connected to the infrared module, the 16th / 17th / 20th pins of the controller are respectively connected to the A, B, and C three-phase current output terminals of the current transformer TA through the operational amplifier circuit and various electronic circuits, the 23rd pin of the controller is connected to the liquid level sensor circuit, wherein the liquid level sensor is provided at a drainage point for detecting the water level at the drainage point, the 50th pin of the controller is connected to the ambient temperature and humidity sensor circuit for detecting the ambient temperature and humidity in the mine, the 8th pin of the controller is connected to the water pressure sensor circuit, and the water pressure sensor is used to detect the pressure in the drainage pipe, and the 9th / 10th / 11th / 24th pins of the controller are respectively connected to the closing indicator light, The trip indicator light, communication indicator light and fault indicator light, the 25 / 37 / 38 pins of the controller are connected to the forward control relay, reverse control relay and leakage input relay through the electronic circuit, the 39 / 40 / 51 / 52 pins of the controller are connected to the short-circuit test relay, leakage test relay, leakage lockout relay and online output relay circuit, the 55 pin of the controller is connected to the flow switch circuit, the 56 / 57 / 58 / 59 pins of the controller are connected to the far and near status feedback, operation status 1 feedback, operation status 2 feedback, and online input lockout signal circuit, the 61 / 62 / 29 / 30 pins of the controller are connected to the wind power lockout input, gas lockout input, high water level and low water level signal circuits, and the 33-36 pins of the controller are connected to the down, up, confirmation and reset buttons through the photoelectric coupler and the electronic circuit pins.

[0034] Among them, wind power and gas interlocks are connected to the normally open or normally closed contacts of the protection device. The protection device can set the "wind power gas normally closed" control word selection and can trip after a delay (the fixed value setting methods include: method one: setting through LCD operation; method two: setting through the RS485 communication interface through the communication management machine). The delay time is generally set to 0.50~10.00 seconds. The protection signal is triggered when the switch is open and then locked and closed, and the fault trip is triggered when the switch is closed. If the wind power gas signal returns to normal, it needs to be reset. The water flow switch is used to detect whether there is a water flow signal flowing within the set time after the water pump motor is started, and send a signal for tripping or alarming.

[0035] The protection device provided by the utility model can realize three control modes: local, remote and water level. The local control mode realizes control through local start and stop buttons, the remote control mode receives signals from the host computer through the RS485 interface to control the remote start and stop buttons to realize remote control, or receives infrared signals emitted by an infrared remote controller to control the remote start and stop buttons to realize remote control, and the water level control mode is mainly used for automatic start and stop of water pumps at drainage points. When the water level sensor detects that the water level is high, the motor is automatically started to drain water, and when the water level sensor detects that the water level is low, the motor is automatically stopped to stop drainage.

[0036] Set to local mode, local button opening and closing control.

[0037] Set to network control mode, allowing remote and local buttons (local buttons open the quantity to introduce comprehensive protection) for opening and closing control. Remote (remote control) control is supported in network control mode.

[0038] Set to water level mode to allow opening and closing control based on high / low water level signals.

[0039] The principle of the utility model is as follows:

[0040] After the protection device is installed in the flameproof starter switch, the isolation phase-changing switch QS is manually closed, and then the transformer T1 is energized, and T1 outputs two sets of power supplies, AC33V and AC36V. The AC33V power supply is used as the power supply for the protection device, and the AC36V power supply is used for the vacuum contactor KM1 and the intrinsically safe plug-in. After the protection device is energized, it first performs a self-check. If there is no fault, the locking points 25 and 26 are closed and enter the state of waiting for starting.

[0041] Press the start button (communication closing button), the intrinsically safe plug-ins 11 and 12 are turned on, KM1 is energized and closed, and the normally open auxiliary contact KM 1-1 Self-protection. When you need to stop, press the emergency stop button, the vacuum contactor KM1 loses power and releases, the motor stops, and the switch returns to the initial state.

[0042] The protection device proposed by the utility model can quickly sample the collected analog quantity and switch quantity and complete various calculations and processing, and can display system voltage, three-phase current, insulation resistance and other parameters on the display screen 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 bus communication interface when necessary. The protection function of the protection device can be adjusted at any time through simple operations, and various information on the display screen can be observed through the flameproof window. The buttons on the switch body can also complete the adjustment and testing of various protection functions of the protector without opening the switch shell on site, so as to realize the safe, reliable and stable operation of the comprehensive protection device.

[0043] 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.

[0044] 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 comprehensive protection device for low-voltage starter for mining, characterized in that: The invention comprises a shell, a display screen and a plurality of indicator lights are arranged on the front of the shell, a control circuit board of an integrated controller is arranged inside the shell, an input end of the circuit board is connected to an AC33V output end of a transformer T1, and the AC33V output end of the transformer T1 is also connected in parallel with ports 14 and 15 of an intrinsically safe plug-in to supply power to the intrinsically safe plug-in, an AC36V neutral line of the transformer T1 is connected in series with a fuse FU2 and then connected to port 12 of the intrinsically safe plug-in, an AC36V live line of the transformer T1 is connected in parallel with one end of an emergency stop button and one end of a coil KA, the other end of the emergency stop button is connected in series with a coil KM1, a locking contact, and a communication closing contact and then connected to port 12 of the intrinsically safe plug-in, the other end of the coil KA is connected in parallel with a wire connected to the locking contact and a start button and then connected to port 11 of the intrinsically safe plug-in; port 1 of the intrinsically safe plug-in is connected in series with one end of a button SY1, port 2 of the intrinsically safe plug-in is connected in series with one end of a button SB1, and port 3 of the intrinsically safe plug-in is connected in series with an auxiliary normally open contact KM 1-3 Then connect the other end of button SB1, one end of button SB2, the other end of button SY1, and one end of button SY2 in parallel. The other end of button SB2 is connected to port 8 of the intrinsically safe plug-in. The other end of button SY2 is connected to port 7 of the intrinsically safe plug-in after connecting a diode in series. The input end of the transformer T1 is connected to the U and W phase lines of the output end of the isolation phase-changing switch QS, wherein the neutral line of the multi-winding transformer T1 is connected in series with the fuse FU1 and then connected to the W phase of the output end of the isolation phase-changing switch QS, and the U phase of the output end of the isolation phase-changing switch QS can be switched to input 380V, 660V, and 1140V AC, the input end of the isolation phase-changing switch QS is connected to a three-phase power supply, and the three-phase power supply of the output end of the isolation phase-changing switch QS is connected in series with the vacuum contactor KM1 and the current transformer TA, and the three-phase current signal output ends of the current transformer TA are respectively connected to the three-phase current acquisition signal terminals on the circuit board; The three-phase power line at the output end of the isolating phase-changing switch QS is connected in parallel with an RC resistor-capacitor absorption device; The positive electrode of the diode D1 is connected in parallel to the output terminal W of the isolating phase-changing switch QS, and the negative electrode of the diode D1 is connected in series to the auxiliary normally closed contact KM. 1-2 , Auxiliary normally closed contact KA 1-2 , Auxiliary normally closed contact KA 1-4 Then connect to the leakage input terminal of the circuit board; The circuit board is also provided with a short circuit test port and a leakage test port; The operating status 1 port on the circuit board is connected in series with the normally open auxiliary contact KM 1-1 , normally open auxiliary contact KM 1-1 The other end is connected to the common end of the circuit board, and the circuit board is also connected with four buttons: up, down, confirm, and reset; The circuit board is also provided with an RS485 communication port and an infrared remote control receiving module, and is also provided with a temperature detection port, an analog input port, a water flow switch port, a high and low water level control port, a wind power interlock port, a gas interlock port and a far and near control status port.

2. A comprehensive protection device for low-voltage starter for mining according to claim 1, characterized in that: The controller on the circuit board uses a 32-bit single-chip microcomputer, specifically a STM32F103RCT6 controller, and its circuit connection is as follows: Pin 14 of the controller is connected to the motor temperature detection sensor circuit, pin 15 of the controller is connected to the infrared module, pins 16 / 17 / 20 of the controller are respectively connected to the A, B, and C three-phase current output terminals of the current transformer TA through the operational amplifier circuit, pin 23 of the controller is connected to the liquid level sensor circuit, wherein the liquid level sensor is arranged at the drainage point for detecting the water level at the drainage point, pin 50 of the controller is connected to the ambient temperature and humidity sensor circuit for detecting the ambient temperature and humidity in the mine, pin 8 of the controller is connected to the water pressure sensor circuit, and the water pressure sensor is used to detect the pressure in the drainage pipe, and pins 9 / 10 / 11 / 24 of the controller are respectively connected to the closing indicator light, the opening indicator light, the communication indicator light, and the fault indicator light through the photoelectric coupler and the electronic circuit. The 25 / 37 / 38 pins of the controller are respectively connected to the forward control relay, the reverse control relay, and the leakage input relay through the electronic circuit, the 39 / 40 / 51 / 52 pins of the controller are respectively connected to the short-circuit test relay, the leakage test relay, the leakage lockout relay and the online output relay circuit, the 55 pin of the controller is connected to the flow switch circuit, the 56 / 57 / 58 / 59 pins of the controller are respectively connected to the far and near state feedback, the operation state 1 feedback, the operation state 2 feedback, and the online input lockout signal circuit, the 61 / 62 / 29 / 30 pins of the controller are respectively connected to the wind power lockout input, the gas lockout input, the high water level and the low water level signal circuit, the 33-36 pins of the controller are respectively connected to the down, up, confirmation and reset buttons through the photoelectric coupler and the electronic circuit pins.

3. A comprehensive protection device for low-voltage starter for mining according to claim 2, characterized in that: Buttons SB1 and SB2 are the start and stop buttons for local control, and buttons SY1 and SY2 are the start and stop buttons for remote control.

4. A comprehensive protection device for low-voltage starter for mining according to claim 3, characterized in that: The protection device has three control modes: local, remote and water level. The local control mode is controlled by local start and stop buttons. The remote control mode receives signals from the host computer through the RS485 interface to control the remote start and stop buttons to achieve remote control, or receives infrared signals emitted by an infrared remote controller to control the remote start and stop buttons to achieve remote control. The water level control mode is used to automatically start and stop the water pump at the drainage point. When the water level sensor detects a high water level, the motor is automatically started to drain the water. When the water level sensor detects a low water level, the motor is automatically stopped to stop draining the water.

5. A comprehensive protection device for a low-voltage starter for mining according to any one of claims 1 to 4, characterized in that: The U-phase incoming line terminal of the three-phase power supply is connected in parallel to one end of the capacitor, the other end of the capacitor is connected to the positive pole of the power line coupler, the negative pole of the power line coupler is connected in parallel to the W-phase incoming line terminal of the three-phase power supply, and the output end of the power line coupler is directly connected to the carrier communication port on the circuit board.

6. A comprehensive protection device for low-voltage starter for mining according to claim 5, characterized in that: The intrinsically safe plug-in adopts a JAXD-3 pilot module.

7. A comprehensive protection device for low-voltage starter for mining according to claim 4, characterized in that: The infrared module adopts the infrared receiving tube of the F5PT333-3B model.

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