CN203798949U - Online monitoring device for grounding states of iron core of power transformer - Google Patents

Abstract

An online monitoring device for the iron core grounding of a power transformer, in which a hall sensor is cascaded in sequence with a signal processing circuit, an A/D conversion circuit, a CPU central signal processing system, and an alarm circuit, and a keyboard is sequentially cascaded with an integrated receiving processor and a CPU central signal In the processing system, the LCD liquid crystal display screen is connected with the CPU central signal processing system; the acquisition signal processing circuit is composed of a voltage amplification circuit and a comparison and judgment circuit. This device selects Hall sensors and ±15V DC power supply, and sets 0V as the comparison judgment value of the comparison judgment circuit, which greatly improves the sampling sensitivity and test accuracy. The device can monitor the grounding fault of the transformer iron core on-line in real time, and has the characteristics of simple circuit, applicable, timely and accurate fault finding, and the like.

Description

Power transformer core grounding online monitoring device

technical field

The utility model relates to a transformer iron core grounding state monitoring device, in particular to a power transformer iron core multi-point grounding fault on-line monitoring device.

Background technique

Transformer is the main equipment for power transmission, and its performance directly affects the safe operation of the power grid. However, due to load impact, harmonic interference, and aging of equipment itself, it is more common to have multi-point grounding of the iron core. According to statistics, this type of failure rate accounts for more than 30%, so it must be highly valued.

To analyze the source of the grounding of the iron core, it is because there is a dense magnetic flux between the inner coil of the transformer and the iron core, and between the iron core and the fuel tank, and there is a parasitic capacitance. Potential, when the floating potential difference reaches the point where the insulation can be broken down, intermittent discharge will occur, which will cause failure in the long run. The way to deal with this is to set the transformer to ground a little in advance, so as to release the potential difference and eliminate the source of discharge, thereby improving safety performance.

However, after one point is grounded, another point or even more points are grounded, and the potential difference will form a loop through the earth, thereby generating a circulating current. If it is not discovered and eliminated in time, an eddy current will be generated in the iron core, which will increase the no-load loss and cause Local heating occurs between the iron core and the winding, which causes the insulation layer to age and fall off, the oil quality to deteriorate, the chromatogram to exceed the standard, and even cause the transformer to burn out.

To sum up, it can be seen that the transformer needs to be grounded at one point, but it is never allowed to be grounded at multiple points!

Transformer core multi-point grounding faults can be divided into two categories according to their nature: dynamic grounding and stable grounding.

Dynamic grounding means that the grounding point is not firm, and the grounding current changes greatly, mostly due to the grounding fault caused by the small conductive bridge formed by the transformer oil sludge and metal powder under the action of the electromagnetic field.

Stable grounding means that the grounding point is stable and reliable, and the grounding resistance does not change. It is mostly due to the internal insulation defect of the transformer or improper transportation and installation, which causes the silicon steel sheet to be impacted and deformed, such as the grounding fault caused by the clip touching the fuel tank.

If the above situation occurs, the data of the temperature gauge on the main control panel may rise, and if it is serious, the gas relay and related protection devices will be activated, alarmed, and tripped.

Therefore, operators should regularly and irregularly check and test the grounding state of the transformer core to prevent problems before they occur. There are mainly the following methods for detecting multi-point grounding faults of the transformer core:

1. Measure the installed ground wire with a clamp meter to see if the current value exceeds 0.1A;

2. Use a megohmmeter to measure the resistance of the iron core to the ground, and observe whether the insulation value meets the requirements;

3. Carry out gas chromatographic detection of the gas content in the transformer oil to see whether ethylene, methane, and acetylene exceed the standard?

In the above three tests, if any one or more items have abnormal data, it can be judged that there is multi-point grounding in the transformer core, and further testing and analysis are needed to find out and eliminate the fault as soon as possible.

At present, the above detection and search are mainly carried out manually, and the occurrence of multi-point grounding faults in transformer iron cores cannot be found in time and accurately.

Utility model content

The purpose of the utility model is to provide an on-line monitoring device for the iron core grounding of a power transformer in view of the problems in the prior art, so as to automatically monitor multi-point grounding faults of the iron core of the transformer in real time.

The purpose of this utility model is achieved as follows: an online monitoring device for the iron core of a power transformer, which is characterized in that the Hall sensor is cascaded in sequence with a signal processing circuit, an A/D conversion circuit, a CPU central signal processing system and an alarm circuit , the keyboard is sequentially cascaded to integrate the receiving processor and the CPU central signal processing system, and the LCD liquid crystal display is connected to the CPU central signal processing system; the ground wire of the transformer core passes through the threading hole on the body of the above-mentioned Hall sensor The above signal processing circuit is as follows: one end of the resistor R1 is connected to the sampling signal output end of the Hall sensor, the other end of the resistor R1 is connected to the non-inverting input end of the first integrated operational amplifier IC1, and the -15V end of the Hall sensor is connected in series with a resistor After R3 is connected to the inverting input terminal of the first integrated operational amplifier IC1, the -15V terminal of the Hall sensor is connected to the 4 pin of the first integrated operational amplifier IC1 at the same time, and the +15V terminal of the Hall sensor is connected to the first integrated On pin 7 of the operational amplifier IC1, the resistor R2 is connected in series between the non-inverting input terminal of the first integrated operational amplifier IC1 and the signal output terminal, and the signal output terminal of the first integrated operational amplifier IC1 is connected to the non-inverting input terminal of the second integrated operational amplifier IC2 terminal, the inverting input terminal of the second integrated operational amplifier IC2 is connected in series with the resistor R5 and then connected to the -15V terminal of the Hall sensor, a fixed pin of the first potentiometer W1 and one end of the resistor R4 are both connected to the first integrated operational amplifier The signal output end of the amplifier IC1, the other end of the resistor R4 is connected to the -15V end of the working power supply, a fixed pin of the second potentiometer W2 and one end of the resistor R5 are connected to the inverting input end of the second integrated operational amplifier IC2, and the resistor R5 The other end is connected to the -15V end of the working power supply, the sliding arm of the first potentiometer W1 and the sliding arm of the second potentiometer W2 are both connected to the +15V end of the working power supply, the 7 pins and 4 pins of the second integrated operational amplifier IC2 Connect to the +15V terminal and -15V terminal of the working power supply respectively, and the +15V terminal and -15V terminal of the working power supply are respectively connected to the +15V and -15V terminal of the Hall sensor; the above-mentioned first and second integrated operational amplifiers IC1 and The model number of IC2 is F007.

It also has a crystal clock; the crystal clock is connected to the CPU central signal processing system.

It also has an upper computer and a system network, the upper computer is connected with the system network through the RS232 or 485 interface, and the upper computer is connected with the CPU central signal processing system at the same time.

The CPU central signal processing system is composed of MCS-96 single-chip microcomputer, the model of the integrated receiving processor is JCDL8279, the model of the Hall sensor is CS800FA, the model of the crystal hour hand is DS12887, and the model of the A/D converter is MAX125.

The beneficial effects of the utility model are: when a grounding phenomenon occurs, the device can give an alarm in time, facilitate maintenance and repair as soon as possible, and ensure safe, normal and stable operation of the transformer.

The people in the utility model grasp the characteristics of the ground fault as the current change, select the Hall sensor for sampling, and use the positive and negative power supply zero-crossing essentials to set 0V as the comparison judgment value, which greatly improves the sampling sensitivity and testing accuracy. At the same time, single-chip microcomputer technology is introduced to establish a mathematical model to realize calculation, storage, signal remote transmission and directly give the current limiting resistance value. This device has high technical content, complete functions, advanced and perfect, and can automatically monitor the ground fault of the transformer core in real time. , Real-time alarm for timely processing.

The features and advantages of the present utility model will be further elaborated in conjunction with specific embodiments.

Description of drawings

Figure 1 is a block diagram of the circuit principle of the device.

FIG. 2 is a schematic diagram of threading sampling of the Hall sensor HR shown in FIG. 1 .

FIG. 3 is a signal processing circuit diagram shown in FIG. 1 .

Figure 4 is a flowchart of the on-line monitoring program for the transformer core grounding.

Detailed ways

Research and Design of Intelligent On-line Monitoring Device

1. CPU hardware design

The hardware circuit structure is shown in Figure 1. From this figure, it can be seen that the device is separated by a dotted line and consists of an analog part and an intelligent part.

1), Hall sampling technology

Outside the dotted line box in Figure 1 is the analog processing part of the transformer core grounding current monitoring device. First, the Hall technology HR is used for signal acquisition, as shown in Figure 2.

The outline structure and connection mode of the Hall sensor are drawn in Figure 2, in which 1 is the body of the Hall sensor, 2 is the threading hole, 3 is the ground wire to be tested, and 4 is the connecting terminal block, where a is +15V and b is -15V, c is the sampling signal output terminal, d is the common ground, 5 is the fixed orifice plate, 6 is the zero potential and output signal accuracy regulator.

The Hall sensor is a semiconductor device, which is in a stable state when no current passes through it; when the transformer core is grounded at two or more points, because most of the metal powder is lapped to form a small conductive bridge, the resistance is very small, and the current change caused It is very large, but the induced potential is small, and the change rate of the two is more than 10 times different. Therefore, the conventional electromagnetic transformer method is less sensitive, and we use the current-based Hall sensor for collection. It is very suitable, and the sensitivity is greatly improved. .

Since the grounding wire generally adopts a flat metal sheet with a thickness and width of 5х50mm, we choose the CS800FA Hall sensor, with a strip-shaped square hole of 13х51mm in the middle, which is suitable for the grounding metal sheet to pass through.

When the Hall sensor is connected to the line and powered on, it will be put into work and collect the ground current signal.

2) Analog circuit design

a. Sampling input

As can be seen from Figure 3, the hall sensor terminals correspond to the pins of the socket CZ1 one by one, a is connected to the +15V power supply, b is connected to the -15V power supply, c is the acquisition signal transmission end, and d is the common ground. If there is an iron core grounding current, the Hall sensor will collect it and convert it into a voltage signal and connect it to the subsequent circuit from C and D pins for processing.

b. Enlargement and shaping

The middle part of Figure 3 is centered on the integrated block IC1 to form a voltage amplifier. This is because at the initial stage of the fault, the ground current of the iron core is very small, and the signal collected by the Hall sensor is extremely weak, which cannot promote the subsequent alarm circuit to work, so this design is made . We take the resistor R1 as 10KΩ, and the feedback resistor R2 as 500KΩ, so the magnification is:

A=1+R3/R2=1+(500÷10)≈50

That is to say, the signal gain is increased by 50 times through this circuit, so even for the sensed millivolt level voltage signal, it will be amplified to close to 1V, which is enough to promote the subsequent circuit work.

c. Comparative judgment

In Fig. 3, the comparison judger is constituted centering on the operational amplifier IC2. Among them, the potentiometer W1 and the resistor R4 form the working point of the 3-pin of the non-inverting input terminal, and the potentiometer W2 and the resistor R5 form the working point of the 2-pin of the inverting input terminal.

What is more distinctive is that according to the working requirements of the Hall sensor and related components, we design the DC power supply to be ±15V and ±5V respectively, and there is a cross-zero point available. Specifically, adjust the inverting input terminals of W2 and R4 to 0V, as compare value. In this way, when there is a very small iron core grounding current, it will also be collected by the Hall sensor. After being amplified by IC1, the signal is connected to pin 3, and U3>U2 will appear, and the operational amplifier IC2 will flip, thus greatly Improved monitoring sensitivity.

3) Intelligent structure design

In Figure 3, the analog signal that has been reshaped and amplified and output by the 6-terminal of IC2 is introduced into the dotted line box in Figure 1, and a series of intelligent processing will be performed.

a. A/D conversion

Because the 6 terminal sends an analog signal, and the microcomputer chip responds to a digital signal, so A/D conversion processing is required first. This device specifically uses the AD0804 A/D converter, which converts the collected analog signal into a digital signal, and then transmits it to the CPU central signal processor through the data bus and address bus, and compares and judges with the keyboard setting signal. .

b. Clock design

There are quartz crystal oscillators, frequency dividers, counters, etc. inside the device to generate clock signals such as year, month, day, hour, minute, and second. and analysis processing.

c. Keyboard settings

On the right side of Figure 1, there is a keyboard and an IOP (I/O Processor) integrated receiving processor, which is the command center of the RAID controller, and realizes command processing, PCI and SCSI bus data transmission, etc. In cooperation with each other, the man-machine dialogue is completed, and it can be set for the monitored grounding line, sensor number, voltage threshold, alarm start value, time correction, communication protocol, etc.; it can also be combined with the LCD liquid crystal display to set the monitored grounding line number, grounding Check and query the current value and fault time.

d. CPU central signal processing system

According to the needs of information processing, we chose the MCS-96 single-chip microcomputer chip with more powerful functions than the 51 series to carry out the follow-up work.

Through the address bus and data bus, it receives the dual signal of the Hall sensor and the manual setting of the keyboard, enters the working state, and compares, judges, calculates, and stores through the cooperation of software and hardware to determine whether there is multi-point grounding of the transformer core, and Analyze and judge whether it needs to be connected in series and how much current limiting resistor is connected in series.

The processing results made by the central system are sent to the local LCD liquid crystal screen to display the alarm, and the other is sent to the upper computer for classification, arrangement, tabulation, storage, etc. The communication protocol and baud rate adapted to the site, etc., transmit the signal to the system network through the RS232, 485 interface, etc., so that the supervisory personnel of the centralized control center and relevant leaders can understand and grasp the grounding situation of the transformer iron core in a remote place, and timely respond to accidents. Analysis and troubleshooting to ensure the safe and stable operation of the entire transformer.

Figure 1 and Figure 3 show an on-line monitoring device for the iron core grounding of a power transformer, in which the Hall sensors are cascaded in sequence with signal processing circuits, A/D conversion circuits, CPU central signal processing systems and alarm circuits, and the keyboards are cascaded in sequence for integration The receiving processor and the CPU central signal processing system, the LCD liquid crystal display screen is connected with the CPU central signal processing system; the ground wire of the transformer core passes through the threading hole 2 on the body 1 of the above-mentioned Hall sensor; the above-mentioned signal processing circuit It is: one end of the resistor R1 is connected to the sampling signal output end of the Hall sensor, the other end of the resistor R1 is connected to the non-inverting input end of the first integrated operational amplifier IC1, the -15V end of the Hall sensor is connected in series with the resistor R3 and then connected to the second An inverting input terminal of an integrated operational amplifier IC1, the -15V terminal of the Hall sensor is connected to pin 4 of the first integrated operational amplifier IC1 at the same time, and the +15V terminal of the Hall sensor is connected to 7 pins of the first integrated operational amplifier IC1 The resistor R2 is connected in series between the non-inverting input terminal and the signal output terminal of the first integrated operational amplifier IC1, the signal output terminal of the first integrated operational amplifier IC1 is connected to the non-inverting input terminal of the second integrated operational amplifier IC2, and the second integrated The inverting input terminal of the operational amplifier IC2 is connected in series with the resistor R5 and then connected to the -15V terminal of the Hall sensor. A fixed pin of the first potentiometer W1 and one end of the resistor R4 are both connected to the signal output of the first integrated operational amplifier IC1 end, the other end of resistor R4 is connected to the -15V end of the working power supply, a fixed pin of the second potentiometer W2 and one end of resistor R5 are connected to the inverting input end of the second integrated operational amplifier IC2, and the other end of resistor R5 is connected to the working The -15V terminal of the power supply, the sliding arm of the first potentiometer W1 and the sliding arm of the second potentiometer W2 are connected to the +15V terminal of the working power supply, and the 7 pins and 4 pins of the second integrated operational amplifier IC2 are respectively connected to the working power supply The +15V and -15V terminals of the working power supply are respectively connected to the +15V and -15V terminals of the Hall sensor; the models of the above-mentioned first and second integrated operational amplifiers IC1 and IC2 are F007 .

It also has a crystal clock; the crystal clock is connected to the CPU central signal processing system.

It also has an upper computer and a system network, the upper computer is connected with the system network through the RS232 or 485 interface, and the upper computer is connected with the CPU central signal processing system at the same time.

The CPU central signal processing system is composed of MCS-96 single-chip microcomputer, the model of the integrated receiving processor is JCDL8279, the model of the Hall sensor is CS800FA, the model of the crystal hour hand is DS12887, and the model of the A/D converter is MAX125.

2. CPU software design

According to the needs of transformer core grounding monitoring, we designed the relevant software process, as shown in Figure 4.

It can be seen from Figure 4 that the device works according to the following procedures:

1), initialization

At the beginning of the work, first perform initialization processing such as clearing and resetting the monitoring system;

2), man-machine dialogue

Enter a series of signals and data from the keyboard, which are:

a. The serial number of the monitored transformer, that is, the core grounding wire (the device is suitable for monitoring multiple main transformers);

b. Test and insert the open circuit voltage Uk and initial current I0. Because the ground current is less than 0.1A under normal circumstances, the measured open circuit voltage will be very small. The initial resistance can be obtained by Ohm's law:

R0=Uk/I0

This R0 is also equivalent to the internal resistance, which is basically unchanged.

c. Set the scan time t. In order to avoid instantaneous impact and subtract signal operation time, etc., to confirm the authenticity of the fault, this device takes t as 10 seconds.

3) Compare and judge

When the parameter setting is completed, the internal data conversion process is performed to form a binary code that can be recognized by the single-chip computer; on the other side, the Hall sensor HR samples the current of each monitored iron core grounding wire, and converts it into a digital signal through A/D , and send it to the CPU to compare and judge Vd and Vs (the subscript letters d and s represent "ground" and "setting" respectively).

Normally, the collected signal Vd is close to 0, which must be lower than the internal reference signal voltage Vs, that is, in the inquiry of "Vd>Vs?", a negative answer is obtained, so the signal is output from the N terminal of the comparator, and the "circular scanning" is continued. ".

In Figure 4, when two or more points of the monitored transformer core are grounded, a grounding current will be generated. After the current is collected by online monitoring, converted and processed, it will be sent to the single-chip microcomputer for comparison and judgment, and the result of Vd>Vs will appear. , at this time the signal will be output from the Y terminal of the comparator.

The signal output from the Y terminal is recorded and stored by the smart chip when the fault occurs, the transformer number, etc., and the signal is transmitted to the LCD screen for display and alarm.

In Figure 1 and Figure 4, it can be seen that the other side of the process is for troubleshooting: output commands from the CPU control line I/O port to control the start and stop of the relay J. Normally, the common terminal of the normally closed node J2 of the relay is connected to the iron core through the ground wire of the Hall sensor, and the other end is connected to the ground; when a ground fault occurs, the normally closed node J2 is disconnected, the normally open node J1 is closed, and J1 The common terminal connects the iron core to pass through the ground wire of the Hall sensor, and the other end is connected to one end of the current limiting resistor Rc, and the other end of the current limiting resistor Rc is connected to the ground. The starting voltage of the relay is 12V, the control current is 30A, and the model is 4115 (T99).

The online monitoring method and fault handling method also have the following steps: when a multi-point grounding fault occurs in the iron core of the monitored transformer, the fault processing is performed according to the following method: the I/O port of the CPU control line is connected to the relay J start-stop coil, The common terminal iron core of the normally closed node J2 of the relay passes through the ground wire of the Hall sensor, and the other end is connected to the earth; the common terminal iron core of the normally open node J1 passes through the ground wire of the Hall sensor, and the other end is connected to the current limiting resistor One end of Rc, the other end of the current-limiting resistor Rc is connected to the ground; the current-limiting resistance is determined by the formula Rc=R0·Id/I0, the value of Rc is generally 100Ω～1000Ω, and the model of the relay is 4115 (T99).

The reason for the above treatment method is that when the ground current increases and the main transformer cannot be immediately shut down, a current-limiting resistor Rc needs to be connected in series in the ground wire, and the multiple relationship between the ground current Id and I0 measured by the test is multiplied by The initial resistance R0 is used to determine the value of the serial resistance Rc, and its calculation method is:

Rc=R0·Id/I0

The calculation formula of Rc is a mathematical model created based on work experience, which not only avoids the problem that it is impossible to measure the open circuit voltage during the operation of the online monitoring instrument, but also finds a way for the determination of the series resistance value. The calculated Rc is generally between 100 and 1000Ω. Connecting it in series to the grounding wire can reduce the multi-point grounding circulation, alleviate the heat generation of the iron core and the damage to the insulating material. Therefore, the coordinated design of software and hardware is both characteristic and effective treatment measures.

4), information transmission

When the core grounding signal is processed by the CPU, the alarm is displayed on the LCD screen, and at the same time, it is transmitted to the host computer for wider integration and classification to make it more standardized and serialized. Then through the RS232 or 485 interface, the commonly used TCP/IP communication protocol is used to transmit it to the system network, so that the personnel of the centralized control center and relevant leaders can understand the grounding situation of the iron core in a remote place, so as to make timely response and maintenance treatment, so that Avoid the spread and expansion of accidents, which will greatly improve the safety factor of the system.

Troubleshooting Examples

The online monitoring device has produced practical effects in operation. In September 2008, the online ground monitoring device installed on the 2# main transformer of Pailou 110kV substation of Sichuan Neijiang Power Supply Company gave an alarm, showing that the ground current was above 15A, and it was 16.2A when tested with a clamp meter. Then the oil sample was taken for testing, and the results are shown in Table 1 :

Gas Chromatography Test Data of Insulating Oil of Pailou Substation 2# Main Transformer

Table I

                                                 

According to the three-ratio method, C2H2/ C2H4<0.1, CH4/H2>2, and C2H4/C2H6>3, compared with the standard values of 0, 2, and 2, it can be seen that the limit is obviously exceeded, so it indicates that the circulation effect has occurred inside the transformer, causing It generates heat at high temperature, so it must be decomposed.

However, due to the heavy load in Neijiang City at that time, the transformer could not be powered off immediately for maintenance, so we decided to use the method of connecting a current-limiting resistor in series for emergency treatment. According to the calculation prompt of the monitoring device, a 500Ω resistor needs to be connected in series. In our implementation, a 570Ω/50W ceramic tube resistor was connected in series to reduce the current to below 1A, and the situation was alleviated. After monitoring and running for more than two years, it was not until October 2010 that the overhaul was implemented. , to completely troubleshoot and restore normal operation.

Claims (4)

1. A power transformer iron core grounding online monitoring device is characterized in that Hall sensors are cascaded in sequence with signal processing circuits, A/D conversion circuits, CPU central signal processing systems and alarm circuits, and keyboards are cascaded in sequence to integrate receiving The processor and the CPU central signal processing system, and the LCD liquid crystal display are connected to the CPU central signal processing system; the ground wire of the transformer core passes through the threading hole (2) on the body (1) of the above-mentioned Hall sensor; the above-mentioned The signal processing circuit is as follows: one end of the resistor R1 is connected to the sampling signal output end of the Hall sensor, the other end of the resistor R1 is connected to the non-inverting input end of the first integrated operational amplifier IC1, and the -15V end of the Hall sensor is connected in series with the resistor R3 Connected to the inverting input terminal of the first integrated operational amplifier IC1, the -15V terminal of the Hall sensor is connected to pin 4 of the first integrated operational amplifier IC1 at the same time, and the +15V terminal of the Hall sensor is connected to the first integrated operational amplifier Pin 7 of IC1, resistor R2 is connected in series between the non-inverting input terminal of the first integrated operational amplifier IC1 and the signal output terminal, the signal output terminal of the first integrated operational amplifier IC1 is connected to the non-inverting input terminal of the second integrated operational amplifier IC2, The inverting input terminal of the second integrated operational amplifier IC2 is connected in series with the resistor R5 and then connected to the -15V terminal of the Hall sensor. A fixed pin of the first potentiometer W1 and one end of the resistor R4 are both connected to the first integrated operational amplifier IC1 The other end of the resistor R4 is connected to the -15V end of the working power supply, a fixed pin of the second potentiometer W2 and one end of the resistor R5 are connected to the inverting input end of the second integrated operational amplifier IC2, and the other end of the resistor R5 Connect to the -15V end of the working power supply, the sliding arm of the first potentiometer W1 and the sliding arm of the second potentiometer W2 are both connected to the +15V end of the working power supply, and the 7 pins and 4 pins of the second integrated operational amplifier IC2 are respectively connected to The +15V and -15V terminals of the working power supply are respectively connected to the +15V and -15V terminals of the Hall sensor; the above-mentioned first and second integrated operational amplifiers IC1 and IC2 The model is F007. 2. The on-line monitoring device for the iron core grounding of a power transformer according to claim 1, further comprising a crystal clock; the crystal clock is connected to the CPU central signal processing system. 3. The on-line monitoring device for the iron core grounding of a power transformer according to claim 2, characterized in that it also has a host computer and a system network, the host computer is connected to the system network via an RS232 or 485 interface, and the host computer is connected to the system network at the same time. CPU central signal processing system connection. 4. A power transformer iron core grounding online monitoring device according to claim 3, characterized in that, the CPU central signal processing system is composed of MCS-96 single-chip microcomputer, and the model of the integrated receiving processor is JCDL8279, Huo The model of the Seoul sensor is CS800FA, the model of the crystal clock is DS12887, and the model of the A/D converter is MAX125.