Coal mine power supply line fault positioning device

Abstract

The utility model discloses a coal mine power supply line fault positioning device, and relates to the technical field of circuit fault diagnosis. Based on the electromagnetic induction theory and the thermoelectric effect, a voltage and current sensor and a temperature sensor are installed on a coal mine power supply line, measured data are uploaded to a single-chip microcomputer, the fault type and position are judged according to whether the data are abnormal or not, and the problem that coal mine line faults are difficult to diagnose is solved. When a fault occurs at a certain point of the line, voltage, current and temperature parameters can change, the single-chip microcomputer can judge the fault type according to parameter values, the single-chip microcomputer can calculate the fault position according to address codes of the sensors, and the fault position can be found and the fault type can be judged directly according to serial numbers of the sensors by arranging a plurality of sets of devices. The temperature sensor is added, so that the detection result is more accurate and reliable, and the problem that coal mine power supply line faults are difficult to detect is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit fault diagnosis, in particular to a coal mine power supply line fault locating device. Background Art

[0002] With the development of science and technology, the automation level of industrial production has been continuously improved, electrical appliances have been widely used in human life, and the demand for electric energy has been increasing. The application and maintenance of power engineering have also been paid more and more attention. Analyzing the common faults in coal mine power supply lines and sorting out the measures to deal with the faults in order to further improve the quality of coal mine power supply lines has become an important issue that needs to be solved urgently.

[0003] During the power transportation process, the damage to coal mine power supply lines is mostly caused by the direct action of external forces, and some are affected by natural disasters, which cause the coal mine power supply lines to be broken, etc., and cannot provide normal power supply. Because the coal mine power supply lines are overloaded, the vertical pressure on the wires increases, causing the external insulation layer to rupture. In addition, there are also some human factors, such as the materials purchased by the construction team not meeting the construction design regulations, or the construction workers not performing the construction according to the standards, which will cause damage to the coal mine power supply lines.

[0004] There are two main types of existing power supply line fault location technologies: fault analysis method and traveling wave method. Fault analysis method requires the establishment of a mathematical model of the transmission line to collect voltage and current signals during a fault, and to obtain the location of the fault point by solving equations. The traveling wave method is a method of fault distance measurement for transmission lines based on the traveling wave transmission theory: when a transmission line fails, a transient traveling wave propagating along the transmission line will be generated at the fault point, and its propagation speed is close to the speed of light. The time difference between the traveling wave and the measuring device and the speed of light or the approximate speed of light are used to obtain the location of the fault point. With the development and introduction of technologies such as sensors, high-speed data acquisition, and wavelet analysis and processing of signals, many new theories and methods have been applied. Regardless of the fault analysis method or the traveling wave method, the accurate positioning of the positioning system is based on the ability to accurately obtain the primary side signal, and the electrical signal required for the accurate positioning system of the transmission line is through voltage, current transformers and sensors, and fault positioning is performed through sampling calculation. However, the practical application of these technologies in fault detection of coal mine power supply lines is not ideal. Utility Model Content

[0005] In view of the shortcomings of the prior art, the utility model provides a coal mine power supply line fault locating device. The device is based on electromagnetic induction theory and thermoelectric effect. Voltage and current sensors and temperature sensors are installed on the coal mine power supply line. The measured data is uploaded to a single-chip microcomputer to judge the fault type and location based on whether the data is abnormal, so as to solve the problem that coal mine line faults are difficult to diagnose.

[0006] The utility model discloses a coal mine power supply line fault location device, which comprises a plurality of fault location submodules connected in parallel, each of which comprises a temperature sensor module, a voltage sensor module, a current sensor module, a first analog-to-digital conversion module, a single-chip computer module and a display module;

[0007] The temperature sensor module is used to measure the temperature of the terminal resistance of the coal mine power supply line, and generate a voltage according to the temperature and send it to the first analog-to-digital conversion module;

[0008] The voltage sensor module is used to measure the voltage of the coal mine power supply line, generate a first analog signal and send it to the single chip computer module;

[0009] The current sensor module is used to measure the current of the coal mine power supply line, generate a second analog signal and send it to the single chip microcomputer module;

[0010] The first analog-to-digital conversion module is used to convert the voltage output by the temperature sensor module into a first digital signal and send it to the single-chip microcomputer;

[0011] The single chip microcomputer module is used to perform analog-to-digital conversion on the first analog signal and the second analog signal to obtain a second digital signal and a third digital signal, and convert the received first digital signal, second digital signal and third digital signal into corresponding voltage values ​​and current values ​​and then send them to the display module;

[0012] The display module is used to display voltage, current and temperature according to the received voltage value and current value;

[0013] Furthermore, the single-chip microcomputer module performs analog-to-digital conversion on the first analog signal and the second analog signal respectively through a second analog-to-digital conversion module in the single-chip microcomputer STM32F103R6 to obtain a second digital signal and a third digital signal;

[0014] Further, the temperature sensor module includes: a temperature sensor LM35D, an operational amplifier LM358, a resistor R4, a resistor R5, a resistor R6, a resistor R7 and a sliding rheostat; wherein pin 8 of the temperature sensor LM35D is connected to the VCC terminal, pin 4 is connected to the ground terminal, pin 1 is connected to resistor R4, the other end of resistor R4 is connected to pin 3 of the operational amplifier, pin 2 of the operational amplifier is connected to pin 5 of the operational amplifier through resistors R5 and R6 connected in series in sequence, pin 6 of the operational amplifier is connected to the ground terminal through resistor R7, the sliding end of the sliding rheostat is connected to pin 7 of the operational amplifier, and the fixed end is connected to pin 6 and pin 7 respectively;

[0015] The current sensor module includes: a current sensor ACS712ELCTR and a capacitor C1; wherein, pin 1 and pin 2 of the current sensor ACS712ELCTR are connected to the phase line through a resistor R3, pin 3 and pin 4 of the current sensor ACS712ELCTR are connected to the ground line, pin 8 of the current sensor ACS712ELCTR is connected to the VCC terminal, pin 5 is connected to the ground terminal, pin 6 is connected to the ground terminal through a capacitor C1, and pin 7 is connected to the single-chip microcomputer module;

[0016] The voltage sensor module is a ZMPT101B voltage transformer module, the pin L and the pin N of the ZMPT101B voltage transformer module are respectively connected to the phase line and the neutral line of the cable, the pin VCC of the ZMPT101B voltage transformer module is connected to the VCC terminal, the pin GND is connected to the ground terminal, and the pin VOUT is connected to the single-chip computer module;

[0017] The first analog-to-digital conversion module includes: an analog-to-digital converter TLC549 and a capacitor C2; wherein pin 1 and pin 8 of the analog-to-digital converter TLC549 are connected to the VCC terminal, and pin 8 is connected to the ground terminal through the capacitor C2, pin 3 and pin 4 are connected to the ground terminal, pin 2 is connected to pin 7 of the operational amplifier, and pin 5, pin 6 and pin 7 are all connected to the single-chip microcomputer module;

[0018] The single-chip microcomputer module includes a single-chip microcomputer STM32F103R6, a clock circuit and a reset circuit; Pin 60 of the single-chip microcomputer STM32F103R6 is connected to the ground terminal, Pin 16 is connected to Pin 7 of the current sensor ACS712ELCTR, Pin 17 of the single-chip microcomputer STM32F103R6 is connected to Pin OUT of the ZMPT101B voltage transformer module, Pin 61 and Pin 62 of the single-chip microcomputer STM32F103R6 are both connected to the display module, Pin 8, Pin 9 and Pin 10 of the single-chip microcomputer STM32F103R6 are connected to Pin 7, Pin 10 of the analog-to-digital converter TLC549 in sequence. 6 and pin 5; wherein the reset circuit comprises: a button K1, a resistor R8 and a capacitor C3, one end of the button K1 is connected to pin 7 of the single-chip computer STM32F103R6, and the other end is connected to the ground terminal, the capacitor C3 is connected to both ends of the button K1, and the pin 7 of the single-chip computer STM32F103R6 is simultaneously connected to the VCC terminal through the resistor R8; the reset circuit comprises: a crystal oscillator Y1, a capacitor C4 and a capacitor C5, the two ends of the crystal oscillator Y1 are respectively connected to pin 5 and pin 6 of the single-chip computer STM32F103R6, and the pin 5 and pin 6 of the single-chip computer STM32F103R6 are respectively connected to the ground terminal through the capacitor C4 and the capacitor C5;

[0019] The display module includes: OLED, resistor R1, resistor R2, resistor R9, capacitor C6, capacitor C7, capacitor C8, capacitor C9, capacitor C10, capacitor C11, capacitor C12 and diode D1, capacitor C8 is connected between pin 1 and pin 2 of OLED, capacitor C9 is connected between pin 3 and pin 4 of OLED, pin 7 and pin 8 of OLED are connected to VCC terminal, capacitor C11 and capacitor C12 are connected between pin 5 and pin 9 of OLED, pin 5 and pin 9 are connected to VCC terminal, pin 10 of OLED is connected to resistor R1, capacitor C8 is connected between pin 1 and pin 2 of OLED, capacitor C9 is connected between pin 3 and pin 4 of OLED, pin 7 and pin 8 of OLED are connected to VCC terminal, capacitor C11 and capacitor C12 are connected between pin 5 and pin 9 of OLED, pin 5 and pin 9 are connected to VCC terminal, and pin 10 of OLED is connected to resistor R2, capacitor C9 is connected between pin 3 and pin 4 of OLED, pin 7 and pin 8 of OLED are connected to VCC terminal, capacitor C11 and capacitor C12 are connected between pin 5 and pin 9 of OLED, and pin 5 and pin 9 are connected to VCC terminal. 1, the anode of the diode D1 and one end of the capacitor C10, the other end of the resistor R1 and the cathode of the diode D1 are connected to the VCC terminal, the other end of the capacitor C10 is connected to the ground terminal, the pin 11 of the OLED is connected to the resistor R9 and the resistor R2 respectively, wherein the other end of the resistor R9 is connected to the VCC terminal, the other end of the resistor R2 is connected to the ground terminal, the pin 12 of the OLED is connected to the pin 61 of the single-chip microcomputer, the pins 13 and 14 of the OLED are connected together to the pin 62 of the single-chip microcomputer, and the pins 15 and 16 are connected to the ground terminal through the capacitors C7 and C6 respectively.

[0020] The beneficial effects of adopting the above technical solution are:

[0021] When a fault occurs at a certain point in the line, the voltage, current and temperature parameters will change. The single-chip microcomputer can determine the fault type based on the parameter value, and the single-chip microcomputer can calculate the fault location based on the address code of the sensor. By setting up multiple groups of devices, the fault location can be directly found and the fault type can be determined based on the sensor number. The addition of temperature sensors makes the detection results more accurate and reliable, solving the problem of difficult detection of coal mine power supply line faults. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural diagram of a coal mine power supply line fault location device in a specific implementation manner;

[0023] Figure 2 It is a circuit principle diagram of a coal mine power supply line fault location device in a specific implementation manner;

[0024] Figure 3 FIG. 4 is a schematic diagram of a temperature sensor in a specific implementation manner. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0026] This embodiment provides a coal mine power supply line fault location device, such as Figure 1As shown, it includes several fault location submodules connected in parallel, each fault location submodule includes a temperature sensor module, a voltage sensor module, a current sensor module, a first analog-to-digital conversion module, a single-chip computer module and a display module;

[0027] The temperature sensor module is used to measure the temperature of the terminal resistance of the coal mine power supply line, and generate a voltage according to the temperature and send it to the first analog-to-digital conversion module;

[0028] The voltage sensor module is used to measure the voltage of the coal mine power supply line, generate a first analog signal and send it to the single chip computer module;

[0029] The current sensor module is used to measure the current of the coal mine power supply line, generate a second analog signal and send it to the single chip microcomputer module;

[0030] The first analog-to-digital conversion module is used to convert the voltage output by the temperature sensor module into a first digital signal and send it to the single-chip microcomputer;

[0031] The single chip microcomputer module is used to perform analog-to-digital conversion on the first analog signal and the second analog signal to obtain a second digital signal and a third digital signal, and convert the received first digital signal, second digital signal and third digital signal into corresponding voltage values ​​and current values ​​and then send them to the display module;

[0032] The display module is used to display voltage, current and temperature according to the received voltage value and current value;

[0033] Furthermore, the single-chip microcomputer module performs analog-to-digital conversion on the first analog signal and the second analog signal respectively through a second analog-to-digital conversion module in the single-chip microcomputer STM32F103R6 to obtain a second digital signal and a third digital signal;

[0034] Furthermore, if Figure 2 The temperature sensor module shown includes: a temperature sensor LM35D, an operational amplifier LM358, a resistor R4, a resistor R5, a resistor R6, a resistor R7 and a sliding rheostat; wherein pin 8 of the temperature sensor LM35D is connected to the VCC terminal, pin 4 is connected to the ground terminal, pin 1 is connected to resistor R4, the other end of resistor R4 is connected to pin 3 of the operational amplifier, pin 2 of the operational amplifier is connected to pin 5 of the operational amplifier through resistors R5 and R6 connected in series in sequence, pin 6 of the operational amplifier is connected to the ground terminal through resistor R7, the sliding end of the sliding rheostat is connected to pin 7 of the operational amplifier, and the fixed end is connected to pin 6 and pin 7 respectively;

[0035] The schematic diagram of the LM35D temperature sensor is as follows Figure 3As shown in the figure, its sensing temperature range is 0-100℃, accuracy is ±0.6℃, power supply voltage is 4V~30V, and the LM35D sensor can generate different voltages with different temperature changes, which is a linear relationship. The output is 0V at 0℃, and the output voltage increases by 10mV for every 1℃ increase. Since it uses internal compensation, the output can start from 0℃. At normal temperature, LM35 can achieve an accuracy of ±1 / 4℃ without additional calibration.

[0036] The current sensor module includes: a current sensor ACS712ELCTR and a capacitor C1; wherein, pin 1 and pin 2 of the current sensor ACS712ELCTR are connected to the phase line through a resistor R3, pin 3 and pin 4 of the current sensor ACS712ELCTR are connected to the ground line, pin 8 of the current sensor ACS712ELCTR is connected to the VCC terminal, pin 5 is connected to the ground terminal, pin 6 is connected to the ground terminal through a capacitor C1, and pin 7 is connected to the single-chip microcomputer module;

[0037] The voltage sensor module is a ZMPT101B voltage transformer module, the pin L and the pin N of the ZMPT101B voltage transformer module are respectively connected to the phase line and the neutral line of the cable, the pin VCC of the ZMPT101B voltage transformer module is connected to the VCC terminal, the pin GND is connected to the ground terminal, and the pin VOUT is connected to the single-chip computer module;

[0038] The first analog-to-digital conversion module includes: an analog-to-digital converter TLC549 and a capacitor C2; wherein pin 1 and pin 8 of the analog-to-digital converter TLC549 are connected to the VCC terminal, and pin 8 is connected to the ground terminal through the capacitor C2, pin 3 and pin 4 are connected to the ground terminal, pin 2 is connected to pin 7 of the operational amplifier, and pin 5, pin 6 and pin 7 are all connected to the single-chip microcomputer module;

[0039] The single-chip microcomputer module includes a single-chip microcomputer STM32F103R6, a clock circuit and a reset circuit; Pin 60 of the single-chip microcomputer STM32F103R6 is connected to the ground terminal, Pin 16 is connected to Pin 7 of the current sensor ACS712ELCTR, Pin 17 of the single-chip microcomputer STM32F103R6 is connected to Pin OUT of the ZMPT101B voltage transformer module, Pin 61 and Pin 62 of the single-chip microcomputer STM32F103R6 are both connected to the display module, Pin 8, Pin 9 and Pin 10 of the single-chip microcomputer STM32F103R6 are connected to Pin 7, Pin 10 of the analog-to-digital converter TLC549 in sequence. 6 and pin 5; wherein the reset circuit comprises: a button K1, a resistor R8 and a capacitor C3, one end of the button K1 is connected to pin 7 of the single-chip computer STM32F103R6, and the other end is connected to the ground terminal, the capacitor C3 is connected to both ends of the button K1, and the pin 7 of the single-chip computer STM32F103R6 is simultaneously connected to the VCC terminal through the resistor R8; the reset circuit comprises: a crystal oscillator Y1, a capacitor C4 and a capacitor C5, the two ends of the crystal oscillator Y1 are respectively connected to pin 5 and pin 6 of the single-chip computer STM32F103R6, and the pin 5 and pin 6 of the single-chip computer STM32F103R6 are respectively connected to the ground terminal through the capacitor C4 and the capacitor C5;

[0040] The display module includes: OLED, resistor R1, resistor R2, resistor R9, capacitor C6, capacitor C7, capacitor C8, capacitor C9, capacitor C10, capacitor C11, capacitor C12 and diode D1, capacitor C8 is connected between pin 1 and pin 2 of OLED, capacitor C9 is connected between pin 3 and pin 4 of OLED, pin 7 and pin 8 of OLED are connected to VCC terminal, capacitor C11 and capacitor C12 are connected between pin 5 and pin 9 of OLED, pin 5 and pin 9 are connected to VCC terminal, pin 10 of OLED is connected to resistor R1, capacitor C8 is connected between pin 1 and pin 2 of OLED, capacitor C9 is connected between pin 3 and pin 4 of OLED, pin 7 and pin 8 of OLED are connected to VCC terminal, capacitor C11 and capacitor C12 are connected between pin 5 and pin 9 of OLED, pin 5 and pin 9 are connected to VCC terminal, and pin 10 of OLED is connected to resistor R2, capacitor C9 is connected between pin 3 and pin 4 of OLED, pin 7 and pin 8 of OLED are connected to VCC terminal, capacitor C11 and capacitor C12 are connected between pin 5 and pin 9 of OLED, and pin 5 and pin 9 are connected to VCC terminal. 1, the anode of the diode D1 and one end of the capacitor C10, the other end of the resistor R1 and the cathode of the diode D1 are connected to the VCC terminal, the other end of the capacitor C10 is connected to the ground terminal, the pin 11 of the OLED is connected to the resistor R9 and the resistor R2 respectively, wherein the other end of the resistor R9 is connected to the VCC terminal, the other end of the resistor R2 is connected to the ground terminal, the pin 12 of the OLED is connected to the pin 61 of the single-chip microcomputer, the pin 13 and the pin 14 of the OLED are connected together to the pin 62 of the single-chip microcomputer, and the pin 15 and the pin 16 are connected to the ground terminal through the capacitor C7 and the capacitor C6 respectively;

[0041] The following is a description of the one-time use process of the utility model in conjunction with the accompanying drawings:

[0042] The illustrated devices are connected to the cable to be tested in sequence, and the temperature, voltage and current are respectively collected in real time by using the temperature sensor module, voltage sensor module and current sensor module in each fault location submodule in a coal mine power supply line fault location device, and then converted into digital signals through the analog-to-digital conversion module and the second analog-to-digital conversion module inside the single-chip microcomputer STM32F103R6 in the single-chip microcomputer module. The single-chip microcomputer STM32F103R6 sends the digital signals corresponding to the generated voltage, current and temperature to the display module and displays the measured voltage, current and temperature in the display module. When the current values ​​in all fault location submodules before a certain fault location submodule exceed the maximum threshold value, it is judged that the fault location is the circuit between the voltage sensor in the fault location submodule and the voltage sensor in the previous fault location submodule, and the fault type is short circuit. This is because when the circuit between the voltage sensors is short-circuited, the current in the circuit will increase and affect the current sensor connected to the voltage sensor;

[0043] When the voltage values ​​in all fault location submodules after a certain fault location submodule are all 0, it is judged that the fault location is the circuit between the voltage sensor in the fault location submodule and the voltage sensor in the next fault location submodule, and the fault type is open circuit. This is because when a circuit break occurs between voltage sensors, the voltage sensors after the circuit break point stop working;

[0044] When the temperature in the fault location submodule is higher than normal temperature, the fault location is judged to be the terminal resistance of the coal mine power supply line, and the fault type is poor contact. This is because when the terminal resistance of the coal mine power supply line is abnormal, it will cause abnormal temperature at the abnormal point. At this time, the temperature sensor senses the temperature change and outputs different voltages, which are sent to the microcontroller after analog-to-digital conversion.

[0045] Finally, it should be noted that the solutions in the embodiments are not intended to limit the patent protection scope of the utility model. All equivalent implementations or changes that do not deviate from the utility model are included in the patent scope of this case.

Claims

1. A coal mine power supply line fault location device, characterized in that: It includes several fault location submodules connected in parallel, each of which includes a temperature sensor module, a voltage sensor module, a current sensor module, a first analog-to-digital conversion module, a single-chip computer module and a display module; The temperature sensor module is used to measure the temperature of the terminal resistance of the coal mine power supply line, and generate a voltage according to the temperature and send it to the first analog-to-digital conversion module; The voltage sensor module is used to measure the voltage of the coal mine power supply line, generate a first analog signal and send it to the single chip computer module; The current sensor module is used to measure the current of the coal mine power supply line, generate a second analog signal and send it to the single chip microcomputer module; The first analog-to-digital conversion module is used to convert the voltage output by the temperature sensor module into a first digital signal and send it to the single-chip microcomputer; The single chip microcomputer module is used to perform analog-to-digital conversion on the first analog signal and the second analog signal to obtain a second digital signal and a third digital signal, and convert the received first digital signal, second digital signal and third digital signal into corresponding voltage values ​​and current values ​​and then send them to the display module; The display module is used to display voltage, current and temperature according to the received voltage value and current value.

2. A coal mine power supply line fault location device according to claim 1, characterized in that: The single-chip microcomputer module performs analog-to-digital conversion on the first analog signal and the second analog signal respectively through the second analog-to-digital conversion module in the single-chip microcomputer STM32F103R6 to obtain the second digital signal and the third digital signal.

3. A coal mine power supply line fault location device according to claim 1, characterized in that: The temperature sensor module includes: a temperature sensor LM35D, an operational amplifier LM358, a resistor R4, a resistor R5, a resistor R6, a resistor R7 and a sliding rheostat; wherein pin 8 of the temperature sensor LM35D is connected to the VCC terminal, pin 4 is connected to the ground terminal, pin 1 is connected to resistor R4, the other end of resistor R4 is connected to pin 3 of the operational amplifier, pin 2 of the operational amplifier is connected to pin 5 of the operational amplifier through resistors R5 and R6 connected in series in sequence, pin 6 of the operational amplifier is connected to the ground terminal through resistor R7, the sliding end of the sliding rheostat is connected to pin 7 of the operational amplifier, and the fixed end is connected to pin 6 and pin 7 respectively.

4. A coal mine power supply line fault location device according to claim 1, characterized in that: The current sensor module includes: a current sensor ACS712ELCTR and a capacitor C1; wherein, pin 1 and pin 2 of the current sensor ACS712ELCTR are connected to the phase line through a resistor R3, pin 3 and pin 4 of the current sensor ACS712ELCTR are connected to the ground line, pin 8 of the current sensor ACS712ELCTR is connected to the VCC terminal, pin 5 is connected to the ground terminal, pin 6 is connected to the ground terminal through the capacitor C1, and pin 7 is connected to the single-chip computer module.

5. A coal mine power supply line fault location device according to claim 1, characterized in that: The voltage sensor module is a ZMPT101B voltage transformer module, and the pin L and pin N of the ZMPT101B voltage transformer module are respectively connected to the phase line and the neutral line of the cable, the pin VCC of the ZMPT101B voltage transformer module is connected to the VCC terminal, the pin GND is connected to the ground terminal, and the pin VOUT is connected to the single-chip computer module.

6. A coal mine power supply line fault location device according to claim 1, characterized in that: The first analog-to-digital conversion module includes: an analog-to-digital converter TLC549 and a capacitor C2; wherein pin 1 and pin 8 of the analog-to-digital converter TLC549 are connected to the VCC terminal, and pin 8 is connected to the ground terminal through capacitor C2, pin 3 and pin 4 are connected to the ground terminal, pin 2 is connected to pin 7 of the operational amplifier, and pin 5, pin 6 and pin 7 are all connected to the single-chip microcomputer module.

7. A coal mine power supply line fault location device according to claim 1, characterized in that: The single-chip microcomputer module includes a single-chip microcomputer STM32F103R6, a clock circuit and a reset circuit; Pin 60 of the single-chip microcomputer STM32F103R6 is connected to the ground terminal, Pin 16 is connected to Pin 7 of the current sensor ACS712ELCTR, Pin 17 of the single-chip microcomputer STM32F103R6 is connected to Pin OUT of the ZMPT101B voltage transformer module, Pin 61 and Pin 62 of the single-chip microcomputer STM32F103R6 are both connected to the display module, Pin 8, Pin 9 and Pin 10 of the single-chip microcomputer STM32F103R6 are connected to Pin 7, Pin 10 of the analog-to-digital converter TLC549 in sequence. 6 and pin 5; wherein the reset circuit includes: a button K1, a resistor R8 and a capacitor C3, one end of the button K1 is connected to pin 7 of the single-chip computer STM32F103R6, and the other end is connected to the ground terminal, the capacitor C3 is connected to both ends of the button K1, and the pin 7 of the single-chip computer STM32F103R6 is simultaneously connected to the VCC terminal through the resistor R8; the reset circuit includes: a crystal oscillator Y1, a capacitor C4 and a capacitor C5, the two ends of the crystal oscillator Y1 are respectively connected to pin 5 and pin 6 of the single-chip computer STM32F103R6, and the pin 5 and pin 6 of the single-chip computer STM32F103R6 are respectively connected to the ground terminal through the capacitor C4 and the capacitor C5.

8. A coal mine power supply line fault location device according to claim 1, characterized in that: The display module includes: OLED, resistor R1, resistor R2, resistor R9, capacitor C6, capacitor C7, capacitor C8, capacitor C9, capacitor C10, capacitor C11, capacitor C12 and diode D1, capacitor C8 is connected between pin 1 and pin 2 of OLED, capacitor C9 is connected between pin 3 and pin 4 of OLED, pin 7 and pin 8 of OLED are connected to VCC terminal, capacitor C11 and capacitor C12 are connected between pin 5 and pin 9 of OLED, pin 5 and pin 9 are connected to VCC terminal, pin 10 of OLED is connected to resistor R1, capacitor C8 is connected between pin 1 and pin 2 of OLED, capacitor C9 is connected between pin 3 and pin 4 of OLED, pin 7 and pin 8 of OLED are connected to VCC terminal, capacitor C11 and capacitor C12 are connected between pin 5 and pin 9 of OLED, pin 5 and pin 9 are connected to VCC terminal, and pin 10 of OLED is connected to resistor R2, capacitor C9 is connected between pin 3 and pin 4 of OLED, pin 7 and pin 8 of OLED are connected to VCC terminal, capacitor C11 and capacitor C12 are connected between pin 5 and pin 9 of OLED, and pin 5 and pin 9 are connected to VCC terminal. 1, the anode of the diode D1 and one end of the capacitor C10, the other end of the resistor R1 and the cathode of the diode D1 are connected to the VCC terminal, the other end of the capacitor C10 is connected to the ground terminal, the pin 11 of the OLED is connected to the resistor R9 and the resistor R2 respectively, wherein the other end of the resistor R9 is connected to the VCC terminal, the other end of the resistor R2 is connected to the ground terminal, the pin 12 of the OLED is connected to the pin 61 of the single-chip microcomputer, the pins 13 and 14 of the OLED are connected together to the pin 62 of the single-chip microcomputer, and the pins 15 and 16 are connected to the ground terminal through the capacitors C7 and C6 respectively.

Images