A fault location device and system for high voltage overhead lines

Abstract

The utility model relates to a kind of fault location device and system of high-voltage overhead line, belong to fault detection technical field, solve how to locate the problem of high-voltage overhead line fault, including monitoring terminal, background host station and client;The monitoring terminal is directly installed on the wire of high-voltage line, the monitoring terminal includes main control unit, data processing unit and fault sampling unit, fault sampling unit acquires electric signal on high-voltage line, data processing unit transmits to main control unit with the signal of collection, main control unit is sent to background host station by wireless mode, the utility model is based on the propagation characteristic of fault current traveling wave on transmission line, by the fault phase of high-voltage instantaneous effect in measured cable, make fault click wear, record the time required for current signal to and fro between test point and fault point, to calculate and determine the distance of test point from fault point, realize fault point positioning.

Description

Technical Field

[0001] This utility model belongs to the field of fault detection technology, and relates to a fault location device and system for high-voltage overhead lines. Background Technology

[0002] The power lines of the railway transportation company are deployed in complex geographical environments with harsh conditions. The towers are widely distributed, the lines span long distances, and the terrain along the corridors is varied. Exposed to the elements for extended periods, they are not only vulnerable to severe weather but also increasingly susceptible to line tripping and forced power outages caused by human-induced damage, seriously threatening power supply reliability. Traditional fault location technologies are limited by low detection accuracy and slow response times, making it difficult to accurately determine the location and cause of faults in a timely manner. This results in low fault diagnosis efficiency and high maintenance costs. Utility Model Content

[0003] The technical solution of this utility model is used to solve the problem of how to locate faults in high-voltage overhead lines.

[0004] This utility model solves the above-mentioned technical problems through the following technical solution:

[0005] A fault location device for high-voltage overhead lines includes a monitoring terminal, a back-end master station, and a client. The monitoring terminal is directly installed on the conductor of the high-voltage line. The monitoring terminal includes a main control unit, a data processing unit, and a fault sampling unit. The fault sampling unit collects electrical signals on the high-voltage line. The data processing unit transmits the collected signals to the main control unit. The main control unit transmits the signals wirelessly to the back-end master station. The back-end master station plots the electrical signals as waveforms for analysis. The user queries the analysis results from the back-end master station through the client.

[0006] Furthermore, the fault sampling unit includes an air switch QF, a current-limiting resistor R, a voltage regulator T1, a voltmeter V, a step-up transformer T2, a high-voltage rectifier silicon stack VD, a high-voltage pulse capacitor C, a sampler B, a discharge gap J, and a waveform display M; the two ends of the air switch QF are connected to the two ends of the power supply, the input end of the voltage regulator T1 is connected to one end of the current-limiting resistor R, the other end of the current-limiting resistor R is connected to the first end of the air switch QF, the output end of the voltage regulator T1 is connected to the second end of the air switch QF, the control end of the voltage regulator T1 is connected to one end of the voltmeter V, the other end of the voltmeter V is connected to the output end of the voltage regulator T1, and the two ends of the voltmeter V are connected in parallel with the low-voltage side of the step-up transformer T2;

[0007] One end of the high-voltage side of the step-up transformer T2 is connected to the cathode of the high-voltage rectifier silicon stack VD. The anode of the high-voltage rectifier silicon stack VD is connected to one end of the discharge gap J. The other end of the discharge gap J is connected to the core wire of the cable under test. The anode of the high-voltage rectifier silicon stack VD is connected to one end of the high-voltage pulse capacitor C. The other end of the high-voltage pulse capacitor C is connected to one end of the sampler B. The other end of the sampler B, the other end of the high-voltage side of the step-up transformer T2, and the armor of the cable under test are all grounded. The output end of the sampler B is connected to the waveform display M through a coaxial cable.

[0008] Furthermore, the power supply is a 220V AC power supply.

[0009] Furthermore, the discharge gap J is specifically a ball gap pressure gauge.

[0010] Furthermore, the sampler B is one of a current sampler, a CT sensor, or a PT sensor.

[0011] Further, the data processing unit includes an external interface J1, bidirectional diodes D23-D25, emitter resistor RS9, diodes D1-D5, resistors R1-R6, and capacitors C1-C4. The external interface J1 is mounted on the waveform display M and connected to the sampling coil. The two ends of the bidirectional diode D25 are connected to the two output terminals of the external interface J1. The emitter resistor RS9 is connected in parallel with the bidirectional diode D25. Diodes D1, D2, D3, and D4 are connected sequentially to form a bridge rectifier circuit. The common connection point of diodes D1 and D2 is connected to one end of the emitter resistor RS9, and the other end of the emitter resistor RS9 is connected to the diode D25. At the common connection point of diode D3 and diode D4, the common connection point of diode D1 and diode D4 is grounded, the common connection point of diode D2 and diode D3 is connected to the anode of diode D5, capacitor C1 and capacitor C2 are connected in parallel, one end of capacitor C1 is grounded, and the other end of capacitor C1 is connected to the cathode of diode D5, resistors R1, R2 and R3 are connected in series, the non-series end of resistor R1 is connected to the anode of diode D5, and the non-series end of resistor R3 is grounded, one end of bidirectional diode D23 is connected to the series end of resistor R1, and the other end of bidirectional diode D23 is grounded, and the common connection point of resistors R2 and R3 is connected to the main control unit as the first analog input channel AD0;

[0012] Resistors R4, R5, and R6 are connected in series. The non-series terminal of resistor R4 is connected to the cathode of diode D5, and the non-series terminal of resistor R6 is grounded. One end of bidirectional diode D24 is connected to the series terminal of resistor R4, and the other end of bidirectional diode D24 is grounded. The common connection point of resistors R5 and R6 is connected to one end of resistor R19. The other end of resistor R19 is connected to the main control unit as the second analog input channel AD1. The two ends of resistor R19 are connected to capacitors C3 and C4, respectively, and the other ends of capacitors C3 and C4 are grounded.

[0013] Furthermore, the main control unit includes a microcontroller and an analog-to-digital converter; the analog-to-digital converter receives analog input signals from the first analog input channel AD0 and the second analog input channel AD1, and sends the digital signals to the microcontroller after analog-to-digital conversion, and the microcontroller sends the signals to the backend main station wirelessly.

[0014] A fault location system for a high-voltage overhead line includes a circuit breaker and the fault location device. Two monitoring terminals are respectively set at the starting point and the ending point of the high-voltage line, and multiple circuit breakers are respectively set on multiple high-voltage line poles.

[0015] Furthermore, the circuit breaker is a pole-mounted AC vacuum circuit breaker.

[0016] The advantages of this utility model are:

[0017] (1) This invention is based on the propagation characteristics of fault current traveling waves on transmission lines. By applying high voltage instantaneously to the fault phase in the cable under test, the fault point is punctured. The time required for the current signal to travel back and forth between the test point and the fault point is recorded. This time is used to calculate and determine the distance between the test point and the fault point to locate the fault point. The high voltage signal is attenuated to the input range of the ADC by the data processing unit and transmitted to the microcontroller via the bus to realize high-frequency sampling and rapid waveform recording of fault traveling waves, reflected traveling waves, and other signals. The transient characteristics of the fault signal are captured, and the fault point is located at the meter level based on the traveling wave velocity and time difference. The location of the fault point is quickly and accurately analyzed, shortening the fault investigation time. This invention also wirelessly sends the waveform signal to the back-end main station for fault type analysis, and the fault type result can be queried through the client. This invention can detect line faults in a timely manner, accurately locate the fault location, reduce the difficulty and cost of manual fault investigation, shorten the fault search time, and improve the safety and reliability of power supply. It is suitable for the maintenance of high-voltage overhead lines and has good application prospects.

[0018] (2) This utility model proposes a distributed fault location system for high-voltage overhead lines, which realizes distributed fault testing on high-voltage overhead lines. By using circuit breakers to control long lines in sections, the fault point is located between two circuit breakers, reducing the scope of the fault impact. It can only cut off power in the fault section and quickly locate the fault point, reducing the scope of the power outage impact. It is also simple to install and use, has low design cost, and reduces the direct and indirect economic losses caused by power outage accidents. Attached Figure Description

[0019] Figure 1 This is a structural diagram of a fault location device for a high-voltage overhead line according to Embodiment 1 of this utility model;

[0020] Figure 2 This is a circuit diagram of the fault sampling unit according to Embodiment 1 of this utility model;

[0021] Figure 3 This is a circuit diagram of the data processing unit in Embodiment 1 of this utility model;

[0022] Figure 4 This is an example diagram of fault location for a high-voltage overhead line according to Embodiment 1 of this utility model. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments:

[0025] Example 1

[0026] like Figures 1-3 Specifically, a fault location device for high-voltage overhead lines is disclosed, comprising a monitoring terminal, a back-end master station, and a client. The monitoring terminal is directly installed on the conductor of the high-voltage line. The monitoring terminal includes a main control unit, a data processing unit, and a fault sampling unit. The fault sampling unit collects electrical signals on the high-voltage line. The data processing unit transmits the collected signals to the main control unit. The main control unit transmits the signals wirelessly to the back-end master station. The back-end master station plots the electrical signals as waveforms for analysis. Users can query the analysis results from the back-end master station through the client.

[0027] The fault sampling unit includes an air switch QF, a current-limiting resistor R, a voltage regulator T1, a voltmeter V, a step-up transformer T2, a high-voltage rectifier silicon stack VD, a high-voltage pulse capacitor C, a sampler B, a discharge gap J, and a waveform display M. The two ends of the air switch QF are connected to the two ends of the power supply. The input end of the voltage regulator T1 is connected to one end of the current-limiting resistor R, and the other end of the current-limiting resistor R is connected to the first end of the air switch QF. The output end of the voltage regulator T1 is connected to the second end of the air switch QF. The control end of the voltage regulator T1 is connected to one end of the voltmeter V, and the other end of the voltmeter V is connected to the output end of the voltage regulator T1. The two ends of the voltmeter V are connected in parallel with the low-voltage side of the step-up transformer T2.

[0028] One end of the high-voltage side of the step-up transformer T2 is connected to the cathode of the high-voltage rectifier silicon stack VD. The anode of the high-voltage rectifier silicon stack VD is connected to one end of the discharge gap J. The other end of the discharge gap J is connected to the core wire of the cable under test. The anode of the high-voltage rectifier silicon stack VD is connected to one end of the high-voltage pulse capacitor C. The other end of the high-voltage pulse capacitor C is connected to one end of the sampler B. The other end of the sampler B, the other end of the high-voltage side of the step-up transformer T2, and the armor of the cable under test are all grounded. The output end of the sampler B is connected to the waveform display M through a coaxial cable.

[0029] Furthermore, the power supply is a 220V AC power supply.

[0030] Furthermore, the discharge gap J is specifically a ball gap voltage gauge used for high voltage measurement; the waveform display M is used to display the high voltage flashover test waveform.

[0031] Furthermore, the voltage regulator T1 is a 0-250V 1-2KVA voltage regulator, the step-up transformer T2 has a power of 1-3KVA, and the high-voltage pulse capacitor C has a capacitance of 1-8uF and a withstand voltage greater than 10KV.

[0032] Furthermore, the sampler B is specifically a current sampler used to collect current; the sampler B can also be a CT sensor or a PT sensor.

[0033] In this embodiment, a voltage regulator T1 is used to regulate the 220V AC power supply. A step-up transformer T2 applies high voltage to the faulty phase and charges the high-voltage pulse capacitor C. Current is sampled through the high-voltage pulse capacitor C. After the voltage regulator T1 continuously boosts the voltage of the faulty cable to a certain value, a flashover discharge occurs at the fault point. The high-voltage signal crosses the fault point and is reflected at the terminal. The two voltages are superimposed, and an impulse voltage is applied to the cable under test through the discharge gap J, causing the fault to break down and form an arc. During the arcing, the high-voltage signal travels back and forth between the cable's beginning and the grounding position several times. Because the pulse width is large during the first breakdown as it crosses the fault position and returns, this embodiment selects to measure the pulse width after the second cycle. This embodiment uses a high-voltage instantaneous application to the faulty phase in the cable under test, causing the fault to break down. A high-precision GPS time synchronization is used to record the time required for the current signal to travel back and forth between the test point and the fault point, thereby calculating the distance between the test point and the fault point.

[0034] The data processing unit includes an external interface J1, bidirectional diodes D23-D25, an emitter resistor RS9, diodes D1-D5, resistors R1-R6, and capacitors C1-C4. The external interface J1 is located on the waveform display M and is connected to the sampling coil. The two ends of the bidirectional diode D25 are connected to the two output terminals of the external interface J1. The emitter resistor RS9 is connected in parallel with the bidirectional diode D25. Diodes D1, D2, D3, and D4 are connected sequentially to form a bridge rectifier circuit. The common connection point of diodes D1 and D2 is connected to one end of the emitter resistor RS9, and the other end of the emitter resistor RS9 is connected to the connection point between diode D3 and D4. At the common connection point of diode D4, the common connection point of diodes D1 and D4 is grounded, the common connection point of diodes D2 and D3 is connected to the anode of diode D5, capacitors C1 and C2 are connected in parallel, one end of capacitor C1 is grounded, and the other end of capacitor C1 is connected to the cathode of diode D5, resistors R1, R2, and R3 are connected in series, the non-series end of resistor R1 is connected to the anode of diode D5, and the non-series end of resistor R3 is grounded, one end of bidirectional diode D23 is connected to the series end of resistor R1, and the other end of bidirectional diode D23 is grounded, and the common connection point of resistors R2 and R3 is connected to the main control unit as the first analog input channel AD0;

[0035] Resistors R4, R5, and R6 are connected in series. The non-series terminal of resistor R4 is connected to the cathode of diode D5, and the non-series terminal of resistor R6 is grounded. One end of bidirectional diode D24 is connected to the series terminal of resistor R4, and the other end of bidirectional diode D24 is grounded. The common connection point of resistors R5 and R6 is connected to one end of resistor R19. The other end of resistor R19 is connected to the main control unit as the second analog input channel AD1. The two ends of resistor R19 are connected to capacitors C3 and C4, respectively, and the other ends of capacitors C3 and C4 are grounded.

[0036] Furthermore, the bidirectional diodes D23 to D25 are bidirectional trigger diodes, possessing bidirectional voltage regulation and bidirectional negative resistance characteristics.

[0037] In this embodiment, the data processing unit implements signal conditioning and current protection in a low-power manner. The external interface J1 is located on the waveform display M for communication with external devices. Transistor D25 controls the power supply to the sensor. The rectifier bridge formed by diodes D1 to D4 provides input protection to prevent reverse voltage or electrostatic discharge (ESD) from damaging downstream devices. Resistors R1 to R6 and resistor R19 form a voltage divider network to adjust the amplitude of the sensor output signal and attenuate the high-voltage signal acquired to the input range of the ADC (analog-to-digital converter). Capacitor C4 is connected in parallel on the power supply or signal path to filter and remove high-frequency noise. Emitter resistor RS9 improves amplification performance through current voltage drop. IDA (current sense amplifier) ​​amplifies the voltage difference across RS9 for real-time monitoring of the sensor's operating current. Analog input channels AD0 and AD1, after passing through the ADC, convert the analog signal conditioned by the data processing unit into a digital signal, which is transmitted to the microcontroller of the main control unit via a bus and then sent to the backend master station via a wireless module.

[0038] The main control unit includes a microcontroller and an analog-to-digital converter (ADC). The ADC receives analog input signals from the first analog input channel AD0 and the second analog input channel AD1, converts them into digital signals, and sends them to the microcontroller. The microcontroller then transmits the signals wirelessly to the backend main station.

[0039] In this embodiment, the monitoring terminal is directly installed on the conductor of the high-voltage overhead power supply line. It monitors electrical signals such as voltage and current signals on the line through a sampler or other sensors. The monitoring terminal collects data at high speed and transmits it to the backend master station wirelessly via GPRS, 4G, or APN private network. The backend master station plots the collected data into waveforms. When a fault occurs in the power supply line, its voltage and current signals will change. The waveform changes of electrical signals are different for different fault types. The monitoring terminal provided in this embodiment collects waveform data under various operating conditions on the power supply line (including but not limited to power frequency current and traveling wave current data under the influence of line lightning strikes, tree obstructions, wind deflection, wildfires, and floating objects). The data is then sent to the backend master station for comparison and analysis with waveforms in the database. The collected waveforms are marked and the causes of waveform faults are analyzed. The backend master station can send the diagnostic results to the user via SMS, and the user can also query the waveform diagnostic results through a web client.

[0040] According to another aspect of the present invention, a fault location system for high-voltage overhead lines is also provided. The fault location system includes a circuit breaker and the aforementioned fault location device. Two monitoring terminals are respectively set at the starting point and the ending point of the high-voltage line, and multiple circuit breakers are respectively set on multiple high-voltage line poles.

[0041] like Figure 4 As shown, this utility model takes the fault location monitoring of a 10.3km long 6kV overhead line from Tangdian to Qianmiao on the Donggang Line as an example. Based on the current status of the Donggang Line, a microcomputer integrated protection device is installed in the high-voltage incoming cabinet at Tangdian Station, and pole-mounted AC vacuum circuit breakers are installed on poles 60 and 89 of the high-voltage line. The pole-mounted AC vacuum circuit breakers can be configured with distribution automation terminals and supporting devices.

[0042] like Figure 4 As shown, S1 is the high-voltage switchgear at Tangdian Station, and S2 and S3 are newly added outdoor dividing pole-mounted AC vacuum circuit breakers. Zero-sequence currents are set for S1, S2, and S3 respectively. The 10.3km long high-voltage line is divided into three sections by the two circuit breakers, with poles 18 to 60 (…). Figure 4 When a ground fault occurs in section A to B of the line, the circuit breaker trips via S1. When poles 60 to 89 ( Figure 4 When a ground fault occurs in section B to C of the line, the circuit breaker trips via S2. When poles 89 to 132 ( Figure 4 When a ground fault occurs in section C to D of the line, the circuit breaker trips via the S3 switch, pinpointing the fault location to between two circuit breakers and thus reducing the scope of the fault's impact.

[0043] To further reduce the impact of faults and quickly locate the fault point, monitoring terminals were installed at the starting point (Tangdian Station, Terminal Pole #18) and the ending point (Qianmiao Station, Terminal Pole #132) of the high-voltage line. Traveling wave monitoring technology was used to collect real-time waveform data of line operation and faults. When a grounding or short-circuit fault occurs, the monitoring terminal is activated instantaneously. Utilizing the terminal's working principle, high voltage is applied instantaneously to the faulty phase of the tested cable, causing the fault to puncture. The time required for the current signal to travel between the test point and the fault point is recorded, and the distance between the test point and the fault point is calculated to locate the fault. The collected electrical signal is then sent to a microcontroller via a data processing unit and wirelessly transmitted to the main station. The online monitoring system platform transforms the line from fault inspection to condition-based maintenance. Compared to traditional high-voltage line fault detection technology, this invention can only de-energize the faulty section, quickly locate the fault point, reduce the impact of the power outage, and is simple to install and use with low design costs. It generates nearly 1 million yuan in direct and indirect economic benefits, demonstrating significant economic and social benefits.

[0044] The fault location system provided by this utility model also integrates multimodal interaction functions, supports real-time data visualization, SMS early warning push and historical record query on the Web platform, and supports multiple methods such as web access, computer graphics display, and SMS reminders. This enables operation and maintenance personnel to quickly obtain relevant information such as the time, type and location of the fault, greatly reducing the intensity and cost of fault inspection work, shortening the fault troubleshooting time, and effectively improving power supply reliability.

[0045] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A fault location device for high-voltage overhead lines, characterized in that, It includes a monitoring terminal, a back-end master station, and a client. The monitoring terminal is directly installed on the conductor of the high-voltage line. The monitoring terminal includes a main control unit, a data processing unit, and a fault sampling unit. The fault sampling unit collects electrical signals on the high-voltage line. The data processing unit transmits the collected signals to the main control unit. The main control unit sends the signals to the back-end master station wirelessly. The back-end master station plots the electrical signals as waveforms for analysis. Users can query the analysis results from the back-end master station through the client.

2. The fault location device for a high-voltage overhead line according to claim 1, characterized in that, The fault sampling unit includes an air switch QF, a current-limiting resistor R, a voltage regulator T1, a voltmeter V, a step-up transformer T2, a high-voltage rectifier silicon stack VD, a high-voltage pulse capacitor C, a sampler B, a discharge gap J, and a waveform display M. The two ends of the air switch QF are connected to the two ends of the power supply. The input end of the voltage regulator T1 is connected to one end of the current-limiting resistor R, and the other end of the current-limiting resistor R is connected to the first end of the air switch QF. The output end of the voltage regulator T1 is connected to the second end of the air switch QF. The control end of the voltage regulator T1 is connected to one end of the voltmeter V, and the other end of the voltmeter V is connected to the output end of the voltage regulator T1. The two ends of the voltmeter V are connected in parallel with the low-voltage side of the step-up transformer T2. One end of the high-voltage side of the step-up transformer T2 is connected to the cathode of the high-voltage rectifier silicon stack VD. The anode of the high-voltage rectifier silicon stack VD is connected to one end of the discharge gap J. The other end of the discharge gap J is connected to the core wire of the cable under test. The anode of the high-voltage rectifier silicon stack VD is connected to one end of the high-voltage pulse capacitor C. The other end of the high-voltage pulse capacitor C is connected to one end of the sampler B. The other end of the sampler B, the other end of the high-voltage side of the step-up transformer T2, and the armor of the cable under test are all grounded. The output end of the sampler B is connected to the waveform display M through a coaxial cable.

3. The fault location device for a high-voltage overhead line according to claim 2, characterized in that, The power supply is a 220V AC power supply.

4. The fault location device for a high-voltage overhead line according to claim 2, characterized in that, The discharge gap J is specifically a ball gap pressure gauge.

5. The fault location device for a high-voltage overhead line according to claim 1, characterized in that, The sampler B is one of a current sampler, a CT sensor, or a PT sensor.

6. The fault location device for a high-voltage overhead line according to claim 1, characterized in that, The data processing unit includes an external interface J1, bidirectional diodes D23-D25, an emitter resistor RS9, diodes D1-D5, resistors R1-R6, and capacitors C1-C4. The external interface J1 is located on the waveform display M and is connected to the sampling coil. The two ends of the bidirectional diode D25 are connected to the two output terminals of the external interface J1. The emitter resistor RS9 is connected in parallel with the bidirectional diode D25. Diodes D1, D2, D3, and D4 are connected sequentially to form a bridge rectifier circuit. The common connection point of diodes D1 and D2 is connected to one end of the emitter resistor RS9, and the other end of the emitter resistor RS9 is connected to the connection point between diode D3 and D4. At the common connection point of diode D4, the common connection point of diodes D1 and D4 is grounded, the common connection point of diodes D2 and D3 is connected to the anode of diode D5, capacitors C1 and C2 are connected in parallel, one end of capacitor C1 is grounded, and the other end of capacitor C1 is connected to the cathode of diode D5, resistors R1, R2, and R3 are connected in series, the non-series end of resistor R1 is connected to the anode of diode D5, and the non-series end of resistor R3 is grounded, one end of bidirectional diode D23 is connected to the series end of resistor R1, and the other end of bidirectional diode D23 is grounded, and the common connection point of resistors R2 and R3 is connected to the main control unit as the first analog input channel AD0; Resistors R4, R5, and R6 are connected in series. The non-series terminal of resistor R4 is connected to the cathode of diode D5, and the non-series terminal of resistor R6 is grounded. One end of bidirectional diode D24 is connected to the series terminal of resistor R4, and the other end of bidirectional diode D24 is grounded. The common connection point of resistors R5 and R6 is connected to one end of resistor R19. The other end of resistor R19 is connected to the main control unit as the second analog input channel AD1. The two ends of resistor R19 are connected to capacitors C3 and C4, respectively, and the other ends of capacitors C3 and C4 are grounded.

7. The fault location device for a high-voltage overhead line according to claim 1, characterized in that, The main control unit includes a microcontroller and an analog-to-digital converter; The analog-to-digital converter receives analog input signals from the first analog input channel AD0 and the second analog input channel AD1, and sends the digital signal to the microcontroller after analog-to-digital conversion. The microcontroller then sends the signal to the backend master station wirelessly.

8. A fault location system for high-voltage overhead lines, characterized in that, The device includes a circuit breaker and a fault location device according to any one of claims 1 to 7, wherein two monitoring terminals are respectively set at the starting point and the ending point of the high-voltage line, and multiple circuit breakers are respectively set on multiple high-voltage line poles.

9. A fault location system for high-voltage overhead lines according to claim 8, characterized in that, The circuit breaker is a pole-mounted AC vacuum circuit breaker.

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