CN207181515U - A kind of transformer station's over-voltage monitoring system based on wireless collection technology - Google Patents

Abstract

The utility model belongs to the technical field of electrical automation, in particular to a substation overvoltage monitoring system based on wireless acquisition technology. It consists of two parts: the test probe part and the acceptance probe part. Because the utility model is equipped with an AD conversion circuit, the analog signal quantity is relatively stable into a digital signal quantity, and the details of the original signal are well recorded through the high-speed analog acquisition inside the ARM. Realize the stable sampling of the analog sampling circuit, achieve a good energy-saving effect, can resist the influence from the change of high-voltage electric field parameters, and have good static and dynamic performance. The wireless detection of the test results is realized, the cumbersome coaxial cable wiring at the test site is avoided, and the potential for personal electric shock caused by the wired test of the high-voltage equipment is eliminated, and the test data is accurate and reliable. The original hardware conversion link of the overvoltage signal is simplified, and the flexibility of the whole machine is improved. The device can be widely produced as a product, and the benefit is considerable.

Description

A Substation Overvoltage Monitoring System Based on Wireless Acquisition Technology

technical field

The utility model belongs to the technical field of electrical automation, in particular to a substation overvoltage monitoring system based on wireless acquisition technology.

Background technique

According to the research on power system and its operation and maintenance experience, the insulation performance and overvoltage tolerance level of each link of the power grid play a key role in the healthy operation of the power grid. Once overvoltage occurs, it will cause deterioration of electrical insulation characteristics, and cause grid accidents in severe cases. Therefore, it is necessary to monitor and study the overvoltage of the power system, guide the accident analysis according to the test results, and provide a reasonable basis for further improving the insulation level. At present, the widely used method is to test the overvoltage through the end screen of the bushing, use an external voltage sensor and a capacitive device in series, divide the original overvoltage, and test the attenuated overvoltage, which can well reflect The original waveform, but the fault recorder samples the signal through the coaxial cable. The coaxial cable needs to be matched with an external impedance. The wiring process is cumbersome. Once the capacitive equipment is not well grounded, high voltage signals will be connected to the oscilloscope, threatening the tester's life. Safety. At the same time, the original voltage waveform is attenuated on the long-distance cable when it is collected in a wired manner, resulting in waveform distortion.

Utility model content

The utility model provides a substation overvoltage monitoring system based on wireless acquisition technology aiming at the problems existing in the above-mentioned prior art. The purpose is to solve the cumbersome coaxial cable wiring required on the test site in the past, and eliminate the potential for personal electric shock caused by wired testing of high-voltage equipment. The overvoltage signal acquisition by wireless acquisition is better than traditional wired acquisition. Restore the high frequency part of the original signal while achieving good test accuracy.

The technical scheme that the utility model solves its technical problem adopts is:

A substation overvoltage monitoring system based on wireless acquisition technology, including two parts: the test probe part and the receiving probe part, in which the sensor module is connected with the sampling circuit, the bootstrap circuit, the clamping circuit, and the simultaneous connection amplifier circuit in sequence, and the amplifier circuit It is connected with the ARM core board of the signal sending end; the ARM core board of the signal sending end integrates the CPU of the signal sending end, the AD module of the signal sending end, the SPI module of the signal sending end, and the communication module of the signal sending end; the ARM core board and memory of the signal sending end The circuit is connected, the ARM core board of the signal sending end is connected with the wireless module of the signal sending end, the wireless module of the signal sending end is connected with the antenna of the signal sending end; the antenna of the signal receiving end is connected with the wireless module of the signal receiving end, and the wireless module of the signal receiving end Connect with the ARM core board of the signal receiving end, the ARM core board of the signal receiving end includes the signal receiving end CPU, the signal receiving end AD module, the signal receiving end SPI module, the signal receiving end communication module; the signal receiving end ARM core board and the serial port to USB The circuit is connected, and the serial port to USB circuit is connected with the PC remote monitoring.

The sensor module is a capacitive probe component, which is connected to the sampling circuit after attenuating the overvoltage of the system, corresponding to R3 in the test probe part circuit, and one end of R3 is connected to the bootstrap circuit, corresponding to the 1.2V reference source circuit in the test probe part circuit R1, the other end is connected to the clamping circuit, which corresponds to R2 in the test probe part of the circuit; among them, DW1 and DW2 are connected in series, one end is connected to the output end of R2, and the other end is connected to the output end of R1; one end of R1 is connected to the system power supply, The other one is connected to the output of the reference source chip REF1; the other end of the reference source REF1 is grounded; the output of R2 is connected to the output of R5, and at the same time connected to the amplifier circuit, that is, the inverting proportional input terminal of the operational amplifier circuit; the non-inverting input terminal of U1 The proportional input terminal is connected to R6, and the other end of R6 is grounded; the two ends of R9 are respectively connected to the inverse proportional input terminal pin IN- of U1A and the output terminal pin OUT, and the same phase proportional input terminal pin IN+ of U1A passes through R6 Grounding; the output end is connected to the ARM core board of the signal sending end, that is, the microcontroller of the sending end; the ARM core board of the signal sending end integrates the CPU7 of the signal sending end, the AD module of the signal sending end, the SPI module of the signal sending end, and the communication of the signal sending end Module; connect the converted analog signal to the pin PA0 of the signal sending end CPU; the signal sending end ARM core board is connected with the memory circuit, that is, the ferroelectric memory chip; wherein the pin PB8 of the CPU and the pin of the ferroelectric memory core CS is connected; the pin PB9 of the CPU is connected with the pin SO of the ferroelectric memory core; the pin PB13 of the CPU is connected with the pin SI of the ferroelectric memory core; the pin PB14 of the CPU is connected with the pin SCK of the ferroelectric memory core Connection; the pin PB15 of the CPU is connected to the pin HOLD of the ferroelectric memory core; the ARM core board of the signal sending end is connected to the wireless module of the signal sending end, that is, the wifi circuit of the sending end; the pin PA9 of the CPU is connected to the wireless module of the sending end The RXD pins are connected; the pin PA10 of the CPU is connected to the TXD pin of the wireless module at the sending end; the wireless module at the signal sending end is connected to the antenna at the signal sending end.

The antenna of the signal receiving end is connected with the wireless module of the signal receiving end, that is, the receiving end wifi circuit, and the wireless module of the signal receiving end is connected with the ARM core board of the signal receiving end, that is, the receiving end microcontroller, wherein the TXD pin of the receiving end wifi circuit It is connected to the PA10 pin of the receiving end microcontroller, and the RXD pin of the receiving end wifi circuit is connected to the PA9 pin of the receiving end microcontroller; the ARM core board of the signal receiving end is the receiving end microcontroller including the signal receiving end CPU, AD module at the signal receiving end, SPI module at the signal receiving end, communication module at the signal receiving end; the ARM core board at the signal receiving end is connected to the serial port to USB circuit, and the pin PA2 of the receiving end microcontroller is connected to the RXD of the USB to serial port circuit The pins are connected, the pin PA3 of the receiving microcontroller is connected to the TXD pin of the USB-to-serial port circuit, the pins XI and XO of the USB-to-serial port circuit are respectively connected to the crystal oscillator CY1, and two capacitors are connected C1 and C4 are grounded; the pins UD- and UD+ of the USB-to-serial port circuit are connected to the USB interface and connected to the computer.

The test probe part: take the signal sending end ARM core board as the control core, the signal sending end ARM core board is composed of the signal sending end CPU7, the signal sending end AD module, the signal sending end SPI module, the signal sending end communication module, the signal sending end It is composed of wireless module and signal transmitting antenna; the test probe part is based on the wireless wifi networking form to form the field bus structure.

The receiving probe part: the signal receiving end antenna accepts the wireless signal of the 2.4G frequency band sent by the test probe signal sending end antenna, and connects to the ARM core board of the signal receiving end, and performs asynchronous communication signal transmission through the signal receiving end communication module Decode to get the original waveform of the tested overvoltage signal, and convert the waveform into a standard USB signal through the serial port to USB circuit and connect it with PC for remote monitoring.

The PC remote monitoring refers to a computer.

Advantage and beneficial effect of the present utility model are:

1. The AD conversion circuit makes the analog signal become a digital signal more stably, and the details of the original signal are well recorded through the high-speed analog acquisition inside the ARM.

2. The introduction of high-precision reference source and PID control better realizes the stable sampling of the analog sampling circuit. Although the system is powered by a battery, the voltage varies with the power consumption of the system at any time, but the voltage waveform obtained by sampling is always stable at the real value.

3. The voltage trigger principle is used for detection. When the system does not produce a voltage signal, the system enters the sleep mode to achieve a good energy-saving effect.

4. The control system has better anti-interference ability, can better resist the influence from the change of high-voltage electric field parameters, and has better static and dynamic performance.

5. Realized the wireless detection of test results, avoided the cumbersome coaxial cable wiring at the test site, and eliminated the potential for personal electric shock caused by wired testing of high-voltage equipment, and the test data is accurate and reliable.

6. Most of the functions are realized by software programming, which simplifies the original hardware conversion link of the overvoltage signal and improves the flexibility of the whole machine.

7. The system is based on high-speed ARM microprocessor, portable single-chip microcomputer sampling, wireless Internet of Things technology, big data analysis and other means, according to the typical overvoltage waveform samples tested in substations, it provides lightning protection for subsequent transmission lines and overvoltage protection for substations , The scientific planning and design of the power system provides an analysis basis.

8. The device can be widely produced as a product with considerable benefits.

Description of drawings

The utility model will be further described in detail below in conjunction with specific embodiments of the utility model and accompanying drawings. The embodiments described in the utility model are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

Fig. 1 is a partial structural representation of the test probe in the utility model system;

Fig. 2 is a schematic diagram of the structure of the receiving probe part in the system of the present invention;

Fig. 3 is a schematic diagram of the circuit structure principle of the test probe part of the utility model;

Fig. 4 is a schematic diagram of the circuit structure principle of the receiving probe part of the utility model;

Fig. 5 is the monitoring graph of the overvoltage signal detected by the utility model system;

Fig. 6 is the working flowchart of the utility model system.

In the figure: sensor module 1, sampling circuit 2, bootstrap circuit 3, clamping circuit 4, amplifier circuit 5, signal sending end ARM core board 6, signal sending end CPU7, signal sending end AD module 8, signal sending end SPI module 9. Signal sending end communication module 10, signal sending end wireless module 11, signal sending end antenna 12, signal receiving end ARM core board 13, signal receiving end CPU14, signal receiving end AD module 15, signal receiving end SPI module 16, signal receiving end Receiver communication module 17, signal receiver wireless module 18, signal receiver antenna 19, power supply circuit 20, memory circuit 21, serial port to USB circuit 22, PC remote monitoring 23, sampling resistor 24, bidirectional voltage regulator circuit 25, 1.2V Reference source circuit 26, operational amplifier circuit 27, sending end wifi circuit 28, sending end microcontroller 29, ferroelectric memory chip 30, sending end voltage regulator circuit 31, USB interface 32, USB to serial port circuit 33, receiving end wifi circuit 34 , a microcontroller 35 at the receiving end, and a voltage stabilizing circuit 36 at the receiving end.

Detailed ways

The utility model is a substation overvoltage monitoring system based on wireless acquisition technology. The utility model is based on wireless acquisition technology. Overvoltage is an important index for evaluating grid insulation and determines the safe and stable operation of electrical equipment. The research on the overvoltage of the power system is the key factor for selecting the electrical insulation strength, but the traditional detection methods are all based on the waveform acquisition in the wired way. Based on high-speed ARM microprocessor, portable single-chip microcomputer sampling, wireless Internet of Things technology, big data analysis and other means, the utility model has successfully developed an overvoltage monitoring and analysis system based on wireless acquisition technology. It avoids the cumbersome coaxial cable wiring at the test site, and eliminates the potential for personal electric shock caused by wired testing of high-voltage equipment, and the test data is accurate and reliable. According to the typical overvoltage waveform samples tested in substations, it provides an analysis basis for subsequent lightning protection of transmission lines, overvoltage protection of substations, and scientific planning and design of power systems.

Research on the overvoltage of the power system is the key factor in selecting the electrical insulation strength, but the traditional detection methods are all based on the waveform acquisition in the wired way. However, the utility model is based on the wireless acquisition technology, and the overvoltage is an important index for evaluating the insulation of the power grid, which determines the safe and stable operation of the electrical equipment.

The structure of the system of the utility model is shown in Figure 1 and Figure 2, Figure 1 is a schematic diagram of the structure of the test probe in the system of the utility model, and Figure 2 is a schematic diagram of the structure of the receiving probe in the system of the utility model. The system of the utility model includes two parts: a testing probe part and a receiving probe part.

The sensor module 1 in the system of the utility model is a capacitive probe component, which is connected to the sampling circuit 2 after attenuating the overvoltage of the system, corresponding to R3 in the part circuit of the test probe, and one end of R3 is connected to the bootstrap circuit 3, corresponding to part circuit 1.2 of the test probe The other end of R1 in the V reference source circuit 26 is connected to the clamping circuit 4 , corresponding to R2 in the part circuit 25 of the test probe. DW1 and DW2 are relatively connected in series, one end is connected to the output end of R2 , and the other end is connected to the output of the 1.2V reference source circuit 26 . One end of R1 is connected to the system power supply, and the other end is connected to the output of the reference source chip REF1. The other end of the reference source REF1 is grounded. The output of R2 is connected with the output of R5, and is connected with the amplifier circuit 5, that is, the inverse proportional input terminal of the operational amplifier circuit 27 at the same time. The same-phase ratio input terminal of U1 is connected with R6, and the other end of R6 is grounded. Both ends of R9 are respectively connected to the inverse ratio input pin IN- of U1A and the output pin OUT, and the same phase ratio input pin IN+ of U1A is grounded through R6. The output end is connected to the ARM core board 6 at the signal sending end, that is, the microcontroller 29 at the sending end. The signal sending end ARM core board 6 integrates the signal sending end CPU 7 , the signal sending end AD module 8 , the signal sending end SPI module 9 , and the signal sending end communication module 10 . Connect the converted analog signal to the pin PA0 of the signal sending end CPU7, and process it inside the CPU7. The ARM core board 6 at the signal sending end is connected with the memory circuit 21 , that is, the ferroelectric memory chip 30 . Wherein the pin PB8 of the CPU is connected with the pin CS of the ferroelectric memory core; the pin PB9 of the CPU is connected with the pin SO of the ferroelectric memory core; the pin PB13 of the CPU is connected with the pin SI of the ferroelectric memory core; The pin PB14 of the CPU is connected with the pin SCK of the ferroelectric memory core; the pin PB15 of the CPU is connected with the pin HOLD of the ferroelectric memory core; Circuit 28 is connected. The pin PA9 of the CPU is connected to the RXD pin of the wireless module at the sending end; the pin PA10 of the CPU is connected to the TXD pin of the wireless module at the sending end. The wireless module 11 of the signal sending end is connected with the antenna 12 of the signal sending end.

The signal receiving end antenna 19 is connected with the signal receiving end wireless module 18, that is, the receiving end wifi circuit 34, and the signal receiving end wireless module 18 is connected with the signal receiving end ARM core board 13, that is, the receiving end microcontroller 35, wherein the receiving end wifi circuit The TXD pin of 34 is connected with the PA10 pin of the microcontroller 35 at the receiving end, and the RXD pin of the wifi circuit 34 at the receiving end is connected with the PA9 pin of the microcontroller 35 at the receiving end. The ARM core board 13 at the signal receiving end, that is, the receiving end microcontroller 35 includes a signal receiving end CPU 14 , an AD module 15 at the signal receiving end, an SPI module 16 at the signal receiving end, and a communication module 17 at the signal receiving end. The signal receiving end ARM core board 13 is connected with the serial port to USB circuit 22, the pin PA2 of the receiving end microcontroller 35 is connected with the RXD pin of the USB converting serial port circuit 33, and the pin PA3 of the receiving end microcontroller 35 is connected with the The TXD pin of the USB-to-serial port circuit 33 is connected, and the pins XI and XO of the USB-to-serial port circuit 33 are connected to the crystal oscillator CY1 respectively, and two capacitors C1 and C4 are connected to ground. The pins UD- and UD+ of the USB-to-serial port circuit 33 are connected to the USB interface 32 and connected to the computer. And communicate with PC remote monitoring 23 according to the collected data received.

(1) Test probe part: take the ARM core board 6 of the signal sending end as the control core, and the ARM core board 6 of the signal sending end is composed of the signal sending end CPU7, the signal sending end AD module 8, the signal sending end SPI module 9, and the signal sending end communication The module 10, the wireless module 11 of the signal sending end, and the antenna 12 of the signal sending end are composed. The test probe part is based on the wireless wifi networking form to form a field bus structure. The sampling resistor 2 transmits the collected analog signal to the bootstrap circuit 3 . The bootstrap circuit plays the role of shifting the reference level, shifting the zero reference level of the whole machine to the specified fixed positive reference level to achieve the purpose of AC signal acquisition. At the same time, the input voltage of the system passes through the clamping circuit 4, which has the effect of short-circuiting the input signal, so as to protect subsequent circuits from being damaged due to exceeding the rated voltage. Afterwards, the signal is connected to the operational amplifier 5 to amplify the input signal, so that the input signal is amplified to a reasonable amplitude value. Then the input data is calculated, processed, and stored; then according to the size of the overvoltage signal collected, the asynchronous communication signal is output by the sending end communication module 10 of the signal sending end ARM core board 6, and the control signal sending end wireless module 11 Send the wireless signal in the 2.4G frequency band and send it out through the antenna 12 at the signal sending end.

(2) Receiving probe part: the antenna 19 at the signal receiving end accepts the wireless signal in the 2.4G frequency band sent by the antenna 12 at the test probe signal sending end, and connects to the ARM core board 13 at the signal receiving end, and passes through the communication module 17 at the signal receiving end Decode the asynchronous communication signal to obtain the original waveform of the overvoltage signal, and convert the waveform into a standard USB signal through the serial port to USB circuit 22 and connect it to the PC remote monitoring 23, and display it on the PC remote monitoring 23 The collected original waveform signal is convenient for remote monitoring.

The PC remote monitoring 23 refers to a computer that can directly issue manipulation commands. Various acquisition signal changes and calculation results are displayed on the screen in real time, and historical data can also be stored. In order to increase the depth of data storage, the ARM core board stores the current overvoltage data into the memory circuit 21, and sends the stored data to the program in the host computer through the serial port to USB circuit 22 for calculation and processing, and draws it as The curve of the graph can be intuitively reflected on the screen of the host computer.

Described PC remote monitoring 23 has two functions, and one is to compile, transmit the program, and the program that has compiled is passed on to the signal sending end ARM core board 6 of the test probe; The screen displays the operating conditions of the system, the list of accident alarms, and the query and display of historical parameters.

The circuit principle of the utility model is shown in Fig. 3 and Fig. 4, Fig. 3 is a schematic diagram of the circuit structure principle of the test probe part of the utility model, and Fig. 4 is a schematic diagram of the circuit structure principle of the receiving probe part of the utility model. The utility model is aimed at the collection of overvoltage signals when the system overvoltage occurs, and designs a technical method based on high-speed microprocessor ARM signal collection, and transmits signals in a wireless manner to realize accurate measurement of overvoltage monitoring.

The circuit structure of the test probe of the utility model is composed of: a sampling resistor 24; a bidirectional voltage stabilizing circuit 25; a 1.2V reference source circuit 26, an operational amplifier circuit 27, a wifi circuit 28, a sending end microcontroller 29, a ferroelectric memory chip 30, The voltage stabilizing circuit 31 at the sending end is composed.

The circuit structure of the signal receiving probe of the utility model is composed of: USB interface 32 ; USB to serial port circuit 33 ; receiving terminal wifi circuit 34 ;

According to the wireless acquisition substation overvoltage monitoring method, the specific implementation process of the entire system and the operation steps for implementing control through PC remote monitoring 23 are as follows:

a. First, the three-phase alternating current is sampled by the sampling resistor 24 .

b. The bidirectional voltage stabilizing circuit 25 is composed of two voltage stabilizing tubes connected in reverse, and can limit any half cycle of the input AC signal. When the input signal of the positive half cycle is too high, the voltage stabilizing diode DW1 The equivalent resistance value of the zener diode DW2 is greatly reduced, and when the negative half-cycle input signal is too high, the equivalent resistance value of the Zener diode DW2 is greatly reduced, which has the effect of short-circuiting the input signal, and then flows through R2 at this time The current of the resistor increases, and the input voltage energy of the excessively high amplitude is shared on R2, so as to protect the subsequent circuit from damage due to exceeding the rated voltage.

c. The 1.2V reference source circuit 26 is composed of R1 and 1.2V reference source LM385-1V2, wherein, one end of R1 is connected to the system power supply, and the other end is connected to the reference source chip, so that the zero reference level of the collected signal is transferred to a stable 1.2V reference level to achieve the purpose of AC signal acquisition.

d. The operational amplifier circuit 27 is composed of OPAMP, R5, R6, and R9 to form an inverse proportional amplifier circuit to amplify the input signal so that the input signal can be amplified to a reasonable amplitude value. The amplification factor of the circuit for the input signal is R9/R5 , where R6 is a balance resistor, which plays a role in balancing the input impedance.

e. The microcontroller 29 at the sending end and the microcontroller 35 at the receiving end are ARM chips STM32, which are rationally programmed through C language to realize real-time cycle chain acquisition of input voltage signals in FIFO first-in-first-out mode, using ferroelectric storage The chip 30 not only greatly increases the storage depth, but also satisfies high-speed signal storage. When the system overvoltage occurs, the system sends an alarm signal, and at the same time sends the overvoltage signal waveform to the wifi circuit 28 at the sending end.

f. The PW chips 662k of the voltage stabilizing circuit 31 at the sending end and the voltage stabilizing circuit 36 at the receiving end stabilize the power supply of the system, and C3 plays the role of filtering the system voltage, greatly improving the stability of the system.

g. Receive the wireless signal sent by the wifi circuit 28 at the receiving end through the wifi circuit 34 at the receiving end, and connect the signal to the microcontroller 35 at the receiving end, distinguish the devices according to the addresses of different devices, and pass the test results of the corresponding probes through After being processed by the PC software, it will be displayed on the LCD.

As shown in Fig. 5, Fig. 5 is a monitoring graph of the overvoltage signal detected by the system of the present invention. As shown in Fig. 6, Fig. 6 is a working flow chart of the utility model system.

The working process of a substation overvoltage monitoring system based on wireless acquisition technology of the utility model is as follows:

The initial working state is that the transformer switch is not closed. At this time, the ARM is powered on, and the AD value of the analog input pin is detected, and the AD average value of 64 consecutive acquisitions is used as the reference voltage AD0, and then the AD pin is continuously detected. In the case of the input voltage, once the voltage value exceeds the initialization startup threshold voltage U0, it starts to continuously save the 12-bit precision sampling value to the internal RAM. After the internal RAM is full, send the waveform data of this test to the host through wireless, and write the test results into FRAM. Since the actual test needs to simultaneously detect the three phases A, B, and C at the moment of closing, in order to avoid data transmission conflicts, when the A, B, and C data buffers are full, the data is sent to the host in time-sharing, so that The host performs data processing and waveform display.

Among them, the test probe part: monitor and send the overvoltage signal waveform in the power system in a wireless manner. The overvoltage signal is used for data collection, data storage, data query, data display, collection mode setting and other functions. Send the converted waveform data to the analog input signal terminal of the CPU of the ARM core board; then perform calculation, processing, and storage on the input data; The communication module 10 at the signal sending end outputs an asynchronous communication signal, and the wireless module 11 at the signal sending end is controlled to send a wireless signal in the 2.4G frequency band, which is sent out through the antenna 12 at the signal sending end.

Wherein accepting the probe part: the signal receiving end antenna 19 accepts the wireless signal of the 2.4G frequency band sent by the test probe signal sending end antenna 12, and is connected to the signal receiving end ARM core board 13, and is asynchronously performed by the signal receiving end communication module 17 The decoding of the communication signal obtains the original waveform of the overvoltage signal tested, and converts the waveform into a standard USB signal through the serial port to USB circuit 22 and connects it to the PC remote monitoring 23, and displays the collected signal on the PC remote monitoring 23. original waveform signal.

Claims (6)

1. A substation overvoltage monitoring system based on wireless acquisition technology is characterized in that it includes two parts: a test probe part and a receiving probe part, wherein the sensor module is connected to the sampling circuit, the bootstrap circuit, the clamping circuit, and the amplifier simultaneously The circuits are connected in sequence, and the amplification circuit is connected to the ARM core board of the signal sending end; the ARM core board of the signal sending end integrates the CPU of the signal sending end, the AD module of the signal sending end, the SPI module of the signal sending end, and the communication module of the signal sending end; The end ARM core board is connected to the memory circuit, the signal sending end ARM core board is connected to the signal sending end wireless module, and the signal sending end wireless module is connected to the signal sending end antenna; The antenna of the signal receiving end is connected to the wireless module of the signal receiving end, and the wireless module of the signal receiving end is connected to the ARM core board of the signal receiving end. The ARM core board of the signal receiving end includes the signal receiving end CPU, the signal receiving end AD module, and the signal receiving end SPI Module, signal receiving end communication module; the signal receiving end ARM core board is connected with the serial port to USB circuit, and the serial port to USB circuit is connected with PC remote monitoring. 2. A substation overvoltage monitoring system based on wireless acquisition technology according to claim 1, characterized in that: the sensor module is a capacitive probe component, which is connected to the sampling circuit after the system overvoltage is attenuated, corresponding to the test R3 in the probe part circuit, one end of R3 is connected to the bootstrap circuit, corresponding to R1 in the 1.2V reference source circuit of the test probe part circuit, and the other end is connected to the clamp circuit, corresponding to R2 in the test probe part circuit; DW1 and DW2 are relatively connected in series , one end is connected to the output end of R2, and the other end is connected to the output of R1; one end of R1 is connected to the system power supply, and the other end is connected to the output of the reference source chip REF1; the other end of the reference source REF1 is grounded; the output of R2 It is connected to the output of R5, and connected to the amplifier circuit at the same time, that is, the inverse proportional input terminal of the operational amplifier circuit; the same phase proportional input terminal of U1 is connected to R6, and the other end of R6 is grounded; the two ends of R9 are respectively connected to the inverting proportional input terminal of U1A. Phase ratio input pin IN- and output pin OUT, U1A’s phase ratio input pin IN+ is grounded through R6; the output terminal is connected to the ARM core board at the signal sending end, that is, the sending microcontroller; the signal sending end ARM The core board integrates the signal sending end CPU7, the signal sending end AD module, the signal sending end SPI module, and the signal sending end communication module; the converted analog signal is connected to the pin PA0 of the signal sending end CPU; the signal sending end ARM core The board is connected with the memory circuit, that is, the ferroelectric memory chip; the pin PB8 of the CPU is connected with the pin CS of the ferroelectric memory core; the pin PB9 of the CPU is connected with the pin SO of the ferroelectric memory core; the pin of the CPU PB13 is connected to the pin SI of the ferroelectric memory core; the pin PB14 of the CPU is connected to the pin SCK of the ferroelectric memory core; the pin PB15 of the CPU is connected to the pin HOLD of the ferroelectric memory core; the signal sending end ARM core board It is connected to the wireless module of the signal sending end, that is, the wifi circuit of the sending end; the pin PA9 of the CPU is connected to the RXD pin of the wireless module of the sending end; the pin PA10 of the CPU is connected to the TXD pin of the wireless module of the sending end; the signal is sent The end wireless module is connected with the signal sending end antenna. 3. A kind of substation overvoltage monitoring system based on wireless acquisition technology according to claim 1, is characterized in that: described signal receiving end antenna is connected with signal receiving end wireless module namely receiving end wifi circuit, and signal receiving end wireless The module is connected to the ARM core board of the signal receiving end, that is, the receiving end microcontroller. The TXD pin of the receiving end wifi circuit is connected to the PA10 pin of the receiving end microcontroller, and the RXD pin of the receiving end wifi circuit is connected to the receiving end microcontroller. The PA9 pins of the microcontroller are connected; the ARM core board of the signal receiving end is the receiving end microcontroller including the signal receiving end CPU, the signal receiving end AD module, the signal receiving end SPI module, the signal receiving end communication module; the signal receiving end ARM The core board is connected to the serial-to-USB circuit, the pin PA2 of the receiving microcontroller is connected to the RXD pin of the USB-to-serial circuit, and the pin PA3 of the receiving-end microcontroller is connected to the TXD pin of the USB-to-serial circuit. Connection, the pins XI and XO of the USB to serial port circuit are connected to the crystal oscillator CY1 respectively, and two capacitors C1 and C4 are connected to the ground; the pins UD- and UD+ of the USB to serial port circuit are connected to the USB interface and connected to the computer connect. 4. a kind of substation overvoltage monitoring system based on wireless acquisition technology according to claim 1 is characterized in that: the test probe part: take the signal sending end ARM core board as the control core, and the signal sending end ARM core board is composed of The signal sending end CPU7, the signal sending end AD module, the signal sending end SPI module, the signal sending end communication module, the signal sending end wireless module, and the signal sending end antenna; the test probe part is based on the wireless wifi networking form to form a field bus structure. 5. A kind of substation overvoltage monitoring system based on wireless acquisition technology according to claim 1, characterized in that: said receiving probe part: the wireless signal of the 2.4G frequency band sent by the antenna of the signal receiving end to the antenna of the transmitting end of the test probe signal The signal is received, and connected to the ARM core board of the signal receiving end, and the asynchronous communication signal is decoded by the communication module of the signal receiving end, and the original waveform of the overvoltage signal is obtained, and the waveform is converted into a standard through the serial port to USB circuit The USB signal is connected with PC remote monitoring. 6. A substation overvoltage monitoring system based on wireless acquisition technology according to claim 1, characterized in that: said PC remote monitoring refers to a computer.