CN113884747B - Overvoltage measuring device of electronic transformer - Google Patents

Abstract

The invention discloses an electronic transformer overvoltage measuring device, which is composed of a signal extraction module, a signal conditioning module, an analog-to-digital conversion module, a main control module, a redundant control module, a display module and an alarm module. The signal extraction module It is used to extract the output voltage signal of the electronic transformer. The signal conditioning module is used to process and output the voltage signal. The analog-to-digital conversion module is used to perform analog-to-digital conversion. The main control module is used to receive and process signals and output control signals. The redundant The remaining control module is used to replace the main control module. Using a capacitive transformer to extract the voltage signal from the secondary side of the electronic transformer is cheaper and smaller than using a dedicated signal coil. It performs necessary processing on the sampled voltage signal, improves the sampling accuracy of the signal, and has Redundant controller prevents trouble caused by chip damage when the measuring device is working.

Description

An electronic transformer overvoltage measuring device

Technical field

The present application relates to the technical field of electronic transformers, and specifically to an electronic transformer overvoltage measuring device.

Background technique

As the voltage level of the power grid increases, traditional electromagnetic transformers can no longer adapt to the development of the power system. Electronic voltage transformers are the latest step from voltage transformers and current transformers in modern power systems to intelligent, modular, multi-functional, One of the key equipments for the development of less maintenance, it is suitable for metering, measurement, protection, diagnosis and status monitoring of circuit systems. Electronic transformers apply optical fiber technology and have good and reliable insulation properties, adapting to the high voltage levels of power systems and the development direction of automation and digitalization. However, the electronic transformer voltage detection device currently on the market is too complex for the sampling and conditioning of voltage signals, resulting in high cost and large space. Moreover, because the electronic transformer voltage detection device works in the high-voltage side circuit, once a fault occurs, the voltage The chip inside the measuring device is easy to burn out and it is difficult to replace the chip, which delays the detection time and reduces the efficiency of the detection.

Contents of the invention

In order to solve the above problems, this application provides an electronic transformer overvoltage measurement device, which is composed of a signal extraction module, a signal conditioning module, an analog-to-digital conversion module, a main control module, a redundant control module, a display module and an alarm module.

The signal extraction module is used to extract the output voltage signal of the electronic transformer and send the voltage signal to the signal conditioning module;

A signal conditioning module, connected to the signal extraction module, is used to receive the voltage signal output by the signal extraction module, compare the voltage signal with the reference voltage twice; at the same time, amplify and filter the voltage signal, and The analog voltage signal output obtained after processing;

An analog-to-digital conversion module, connected to the signal conditioning module, is used to receive the analog voltage signal output by the signal conditioning module, convert the analog voltage signal into a digital signal and output it;

The main control module is connected to the analog-to-digital conversion module and is used to receive the digital signal output by the signal conditioning module and send an alarm signal when it determines that the digital signal is over-voltage;

The redundant control module is connected to the analog-to-digital conversion module and the main control module, and is used to replace the main control module when the main control module fails;

The display module is connected to the main control module and the redundant control module, and is used to receive and display the data transmitted by the main control module or the redundant control module;

The alarm module is connected to the main control module and the redundant control module, and is used to receive the alarm signal sent by the main control module or the redundant control module and issue an alarm.

Further, the signal extraction module uses capacitive transformer CVT to extract the voltage signal on the high-voltage side of the electronic transformer.

Further, the signal extraction module includes electronic transformer J1, capacitive transformer CVT, third capacitor C3 and fourth capacitor C4;

The first end of the primary side of the capacitive transformer CVT is connected to the third capacitor C3 and the fourth capacitor C4, the second end of the primary side of the capacitive transformer CVT is connected to the other end of the fourth capacitor C4 and the ground end, and the third capacitor C3 The other end is connected to the output end of the secondary side of electronic transformer J1.

Further, the signal conditioning module includes a buffer DC blocking unit, a program-controlled amplification unit, a signal comparison unit and a signal filtering unit; the first end of the buffer DC blocking unit is connected to the signal extraction module, and the second end of the buffer DC blocking unit is connected to the program-controlled The first end of the amplification unit and the second end of the buffer DC-blocking unit are connected to the first end of the signal comparison unit. The second end of the program-controlled amplification unit is connected to the first end of the signal filtering unit. The second end of the signal filtering unit is connected to the signal comparison unit. The second end of the unit is connected to the first end of the analog-to-digital conversion unit;

The buffering and blocking unit is used to prevent the collected analog voltage signal from being affected by the impedance of the program-controlled amplification unit, plays a buffering role, and performs DC blocking processing on the analog voltage signal;

The program-controlled amplification unit is used to perform program-controlled gain amplification processing on the collected analog voltage signals;

The signal comparison unit is used to compare the collected analog voltage signal with the reference voltage;

The signal filtering unit is used to eliminate noise in the analog voltage signal output by the program-controlled amplification unit.

Further, the buffer DC blocking unit includes a second resistor R2, a first operational amplifier A1 and a first capacitor C1;

The first end of the secondary side of the capacitive transformer CVT is connected to the non-inverting end of the first operational amplifier A1, the second end of the secondary side of the capacitive transformer CVT is connected to ground, and the inverting end of the first operational amplifier A1 passes through the second resistor R2. Connect the first terminal of the first capacitor C1 and the output terminal of the first operational amplifier A1.

Further, the program-controlled amplification unit includes a first program-controlled amplifier U2.

Further, the main control module includes a first controller U1;

The fourth terminal of the first program-controlled amplifier U2 is connected to the second terminal of the first capacitor C1, the eighth terminal of the first program-controlled amplifier U2 is connected to the first power supply +12V, the third terminal of the first program-controlled amplifier U2 and the first program-controlled amplifier U2 The sixth terminal of U2 is commonly connected to the ground terminal, and the first terminal and the second terminal of the first program-controlled amplifier U2 are respectively connected to the third IO terminal and the fourth IO terminal of the first controller U1.

Further, the signal comparison unit includes a second operational amplifier A2, a third operational amplifier A3, a third resistor R3, a fourth resistor R4, a first power supply +12V, a second power supply -12V, a first reference voltage source V1 and second reference voltage source V2;

The non-inverting terminal of the second operational amplifier A2 and the non-inverting terminal of the third operational amplifier A3 are jointly connected to the second terminal of the first capacitor C1, the inverting terminal of the second operational amplifier A2 is connected to the first reference voltage source V1, and the third operational amplifier A3 The inverting terminal is connected to the second reference voltage source V2, the third terminal of the second operational amplifier A2 is connected to the first power supply +12V and the third resistor R3, and the other terminal of the third resistor R3 is connected to the output terminal of the second operational amplifier A2 and The first IO terminal of the first controller U1 and the third terminal of the third operational amplifier A3 are connected to the first power supply +12V and the fourth resistor R4. The other terminal of the fourth resistor R4 is connected to the output terminal of the third operational amplifier A3 and the fourth resistor R4. The second IO terminal of a controller U1.

Further, the second operational amplifier A2 and the third operational amplifier A3 determine whether the voltage of the electronic transformer is within the normal range according to the value of the first reference voltage source V1 and the value of the second reference voltage source V2.

Further, the signal filtering unit includes a fifth resistor R5, a fourth operational amplifier A4, a sixth resistor R6 and a second capacitor C2;

The first end of the fifth resistor R5 is connected to the seventh end of the first program-controlled amplifier U2, and the second end of the fifth resistor R5 is connected to the inverting end of the fourth operational amplifier A4, the sixth resistor R6 and the second capacitor C2. The non-inverting terminal of the fourth operational amplifier A4 is connected to the ground terminal, and the output terminal of the fourth operational amplifier A4 is connected to the other terminal of the sixth resistor R6, the other terminal of the second capacitor C2 and the analog-to-digital converter U3 included in the analog-to-analog data conversion module. Number ends.

Further, the analog-to-digital conversion module uses a 16-bit external analog-to-digital converter U3 to convert the analog voltage signal into a digital signal.

Further, the main control module uses a single-chip microcomputer or CPU to realize data collection and circuit control.

Further, the functions of the main control module also include:

Store the digital signal output by the signal conditioning module.

Further, the redundant control module includes a second controller U1-1, an asynchronous receiver and transmitter U4, a cold start button K1, a first multi-channel strobe and a second multi-channel strobe;

The first end of the first multi-channel strobe is connected to the second end of the analog-to-digital conversion module, the input end of the second controller U1-1 is connected to the second end of the first multi-channel strobe, and the input end of the second controller U1-1 is connected to the second end of the first multi-channel strobe. The input end is connected to the third end of the first multi-way strobe, the first control end of the second controller U1-1 is connected to the fourth end of the first multi-way strobe, and the first controller U1 passes through the asynchronous receiver-transmitter U4 and The cold start button K1 is connected to the second controller U1-1, the output end of the first controller U1 is connected to the first end of the second multi-way strobe, and the output end of the second controller U1-1 is connected to the second multi-way strobe. The second end of the second controller U1-1 is connected to the third end of the second multi-channel strobe;

The first multi-channel strobe is used to control the voltage signal input to the main control module and the redundant control module;

The second multi-channel strobe is used to control the main control module and the redundant control module to output digital signals and control signals;

The chip selected by the second controller U1-1 is the same as the chip selected by the first controller U1; the first multi-channel strobe and the second multi-channel strobe are controlled by the second controller U1-1, and all connected to the first multi-channel strobe are controlled by the second controller U1-1. The line of the controller U1 is switched to the corresponding line of the second controller U1-1; the asynchronous receiver-transmitter U4 selects a universal asynchronous receiver-receiver transmitter to transmit the data in the first controller U1 to the second controller U1-1; When the first controller U1 fails, the cold start button K1 instantly cuts off power to the second controller U1-1 and restarts it.

Description of drawings

Figure 1 is a schematic block diagram of the principle of an electronic transformer overvoltage measuring device provided by an embodiment of the present application;

Figure 2 is a schematic block diagram of the principle of the signal conditioning module provided by the embodiment of the present application;

Figure 3 is a circuit diagram of an electronic transformer overvoltage measuring device provided by an embodiment of the present application.

FIG. 4 is a circuit diagram of a redundant module provided by an embodiment of the present application.

Detailed ways

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many other ways different from those described here. Those skilled in the art can make similar extensions without violating the connotation of the present application. Therefore, the present application is not limited by the specific implementation disclosed below.

FIG. 1 is a schematic block diagram of the principle of an electronic transformer overvoltage measuring device provided by an embodiment of the present application. The measuring device provided by the present application will be described in detail below with reference to FIG. 1 .

Referring to Figure 1, the electronic transformer J1 overvoltage measurement device provided by this application consists of a signal extraction module 1, a signal conditioning module 2, an analog-to-digital conversion module 3, a main control module 4, a redundant control module 5, a display module 6 and The alarm module is composed of 7 components.

Signal extraction module 1 is used to extract the output voltage signal of the electronic transformer J1 and send the voltage signal to the signal conditioning module 2;

The signal conditioning module 2 is connected to the signal extraction module 1 and is used to receive the voltage signal output by the signal extraction module 1, compare the voltage signal with the reference voltage twice, and at the same time amplify and filter the voltage signal. Process and output the analog voltage signal obtained after processing;

Analog-to-digital conversion module 3 is connected to the signal conditioning module 2 and is used to receive the analog voltage signal output by the signal conditioning module 2, convert the analog voltage signal into a digital signal and output it;

The main control module 4 is connected to the analog-to-digital conversion module 3 and is used to receive the digital signal output by the signal conditioning module 2 and send an alarm signal when it determines that the digital signal is over-voltage;

The redundant control module 5 is connected to the analog-to-digital conversion module 3 and the main control module 4, and is used to replace the main control module 4 when the main control module 4 fails;

The display module 6 is connected to the main control module 4 and the redundant control module 5, and is used to receive and display the data transmitted by the main control module 4 or the redundant control module 5;

The alarm module 7 is connected to the main control module 4 and the redundant control module 5, and is used to receive the alarm signal sent by the main control module 4 or the redundant control module 5 and issue an alarm.

The signal extraction module 1 is connected to the first end of the signal conditioning module 2 .

The signal conditioning module 2 is used to prevent the received voltage signal from being affected by impedance. The second end of the signal conditioning module 2 is connected to the first end of the analog-to-digital conversion module 3 .

The second end of the analog-to-digital conversion module 3 is connected to the first end of the main control module 4 and the first end of the redundant control module 5 .

The main control module 4 is used for information exchange with the redundant control module 5; the second end of the main control module 4 is connected to the third end of the signal conditioning module 2.

The second end of the redundant control module 5 is connected to the fifth end of the main control module 4 .

The display module 6 is connected to the third end of the main control module 4 and the third end of the redundant control module 5, and the alarm module 7 is connected to the fourth end of the main control module 4 and the fourth end of the redundant control module 5. end.

Embodiment 1: In a specific embodiment, the capacitive transformer CVT is selected in the above-mentioned signal extraction module 1 to extract the voltage signal on the high-voltage side of the electronic transformer J1. The above-mentioned signal conditioning module 2 performs signal conditioning on the sampled voltage signal through a buffer, a comparator, a program-controlled amplifier and a filter. The buffer is used to buffer the subsequent circuit, and the comparator combines the voltage signal with the set reference voltage. Compare the value and determine whether the voltage signal exceeds the reference voltage value. The program-controlled amplifier can change the gain amplification value to amplify the voltage signal. The filter can use an active filter to suppress the noise in the voltage signal; the above-mentioned analog-to-digital conversion module 3 can choose 16 The external analog-to-digital converter U3 converts the analog voltage signal into a digital signal; the above-mentioned main control module 4 can use a single-chip microcomputer or CPU to realize data collection and circuit control; the above-mentioned redundant control module 5 is the same as the main control module 4; The above-mentioned display module 6 and alarm module 7 respectively use LCD display screen for numerical display and sound and light alarm for alarm, which will not be described in detail here.

Embodiment 2: Based on Embodiment 1, please refer to Figures 2 and 3. In a specific embodiment of the electronic transformer J1 overvoltage measurement device according to the present invention, the signal conditioning module 2 includes a buffer. DC blocking unit 201, program-controlled amplification unit 202, signal comparison unit 203 and signal filtering unit 204;

Specifically, the buffer DC blocking unit 201 is used to prevent the collected analog voltage signal from being affected by the impedance of the program-controlled amplification unit 202, play a buffering role, and perform DC blocking processing on the analog voltage signal;

The program-controlled amplification unit 202 is used to perform program-controlled gain amplification processing on the collected analog voltage signals;

The signal comparison unit 203 is used to compare the collected analog voltage signal with the reference voltage;

The signal filtering unit 204 is used to eliminate noise in the analog voltage signal output by the program-controlled amplification unit 202;

The first end of the buffer DC blocking unit 201 is connected to the signal extraction module 1, the second end of the buffer DC blocking unit 201 is connected to the first end of the program-controlled amplification unit 202, and the second end of the buffer DC blocking unit 201 is connected to the signal comparison unit. The first end of 203, the second end of the program-controlled amplification unit 202 is connected to the first end of the signal filtering unit 204, the second end of the signal filtering unit 204 and the second end of the signal comparison unit 203 are connected to the first end of the analog-to-digital conversion unit .

Further, the signal extraction module 1 includes an electronic transformer J1, a capacitive transformer CVT, a third capacitor C3 and a fourth capacitor C4; the buffer DC blocking unit 201 includes a second resistor R2, a first operational amplifier A1 and the first capacitor C1;

Specifically, the first end of the primary side of the capacitive transformer CVT is connected to the third capacitor C3 and the fourth capacitor C4, the second end of the primary side of the capacitive transformer CVT is connected to the other end of the fourth capacitor C4 and the ground end, and the third end of the primary side of the capacitive transformer CVT is connected to the ground end. The other end of the capacitor C3 is connected to the output end of the secondary side of the electronic transformer J1, the first end of the secondary side of the capacitive transformer CVT is connected to the non-inverting end of the first operational amplifier A1, and the third end of the secondary side of the capacitive transformer CVT is connected. Both ends are connected to ground, and the inverting terminal of the first operational amplifier A1 is connected to the first terminal of the first capacitor C1 and the output terminal of the first operational amplifier A1 through the second resistor R2.

Further, the program-controlled amplification unit 202 includes a first program-controlled amplifier U2; the main control module 4 includes a first controller U1.

Specifically, the fourth terminal of the first program-controlled amplifier U2 is connected to the second terminal of the first capacitor C1, the eighth terminal of the first program-controlled amplifier U2 is connected to the first power supply +12V, and the third terminal of the first program-controlled amplifier U2 is connected to the first terminal of the first capacitor C1. The sixth terminal of the program-controlled amplifier U2 is commonly connected to the ground terminal, and the first terminal and the second terminal of the first program-controlled amplifier U2 are respectively connected to the third IO terminal and the fourth IO terminal of the first controller U1.

Further, the signal comparison unit 203 includes a second operational amplifier A2, a third operational amplifier A3, a third resistor R3, a fourth resistor R4, a first power supply +12V, a second power supply -12V, and a first reference voltage source V1. and the second reference voltage source V2;

Specifically, the non-inverting terminal of the second operational amplifier A2 and the non-inverting terminal of the third operational amplifier A3 are commonly connected to the second terminal of the first capacitor C1, and the inverting terminal of the second operational amplifier A2 is connected to the first reference voltage source V1. The inverting terminal of the operational amplifier A3 is connected to the second reference voltage source V2, the third terminal of the second operational amplifier A2 is connected to the first power supply +12V and the third resistor R3, and the other terminal of the third resistor R3 is connected to the second operational amplifier A2. The output terminal and the first IO terminal of the first controller U1, the third terminal of the third operational amplifier A3 are connected to the first power supply +12V and the fourth resistor R4, and the other terminal of the fourth resistor R4 is connected to the output of the third operational amplifier A3 terminal and the second IO terminal of the first controller U1.

Further, the signal filtering unit 204 includes a fifth resistor R5, a fourth operational amplifier A4, a sixth resistor R6 and a second capacitor C2; the analog-to-digital conversion module 3 includes an analog-to-digital converter U3;

Specifically, the first end of the fifth resistor R5 is connected to the seventh end of the first program-controlled amplifier U2, and the second end of the fifth resistor R5 is connected to the inverting end of the fourth operational amplifier A4, the sixth resistor R6 and the second The non-inverting terminal of the capacitor C2 and the fourth operational amplifier A4 is connected to the ground terminal, and the output terminal of the fourth operational amplifier A4 is connected to the other terminal of the sixth resistor R6, the other terminal of the second capacitor C2 and the analog-to-digital terminal of the analog-to-digital converter U3.

In a specific embodiment, the above-mentioned capacitive transformer CVT can use a 1:100 capacitive transformer CVT to extract the current signal from the secondary side of the electronic transformer J1; the above-mentioned first operational amplifier A1 uses an OP07 series operational amplifier to form a voltage The follower plays the role of a buffer; the above-mentioned second operational amplifier A2 and third operational amplifier A3 can use the MAX902 high-speed, low-power voltage comparator, which is judged based on the value of the first reference voltage source V1 and the second reference voltage source V2 At this time, whether the voltage of the electronic transformer J1 is within the normal direction; the above-mentioned first program-controlled amplifier U2 can choose PGA205, and the first controller U1 can select its 1, 2, and 4 times gain to amplify the voltage signal; the above-mentioned fourth The operational amplifier A4 uses an active filter composed of LM124 to eliminate the noise in the voltage signal and the burr signal generated by the coil; the above-mentioned first controller U1 can use the single-chip microcomputer C8051F060 or the STM32 series single-chip computer; the above-mentioned analog-to-digital converter U3 can be used AD976 single-channel high-precision analog-to-digital converter U3 converts analog voltage signals into digital signals.

Embodiment 3: Based on Embodiment 1, please refer to Figure 4. In a specific embodiment of the electronic transformer J1 overvoltage measuring device of the present invention, the redundant control module 5 includes a second control Receiver U1-1, asynchronous receiver-transmitter U4, cold start button K1, first multi-channel strobe 501 and second multi-channel strobe 502;

Specifically, the first multi-channel strobe 501 is used to control the voltage signal input to the main control module 4 and the redundant control module 5;

The second multi-channel strobe 502 is used to control the main control module 4 and the redundant control module 5 to output digital signals and control signals;

The first end of the first multi-channel strobe 501 is connected to the second end of the analog-to-digital conversion module 3. The input end of the second controller U1-1 is connected to the second end of the first multi-channel strobe 501. The second controller The input terminal of U1-1 is connected to the third terminal of the first multi-channel strobe 501, and the first control terminal of the second controller U1-1 is connected to the fourth terminal of the first multi-channel strobe 501. The first controller U1 is respectively The second controller U1-1 is connected through the asynchronous receiver U4 and the cold start button K1. The output end of the first controller U1 is connected to the first end of the second multi-channel strobe 502. The output end of the second controller U1-1 The second end of the second multi-way strobe 502 is connected, and the control end of the second controller U1-1 is connected to the third end of the second multi-way strobe 502.

In a specific embodiment, the chip selected by the second controller U1-1 needs to be consistent with the chip selected by the first controller U1; the first multi-channel strobe 501 and the second multi-channel strobe 502 are passed through the second controller U1-1 controls and switches all the lines connected to the first controller U1 to the corresponding lines of the second controller U1-1; the above-mentioned asynchronous receiver-transmitter U4 can choose a universal asynchronous receiver-transmitter, and the first control The data in the controller U1 is transmitted to the second controller U1-1; when the first controller U1 fails, the above-mentioned cold start button K1 instantly cuts off the power of the second controller U1-1 and restarts it.

In the embodiment of the present invention, the voltage signal on the high-voltage side of the electronic transformer J1 is extracted through the signal extraction module 1, and the extracted voltage signal is buffered and blocked, program-controlled amplified, signal filtered and signal compared through the signal conditioning module 2. The comparison output signal is transmitted to the main control module 4, and the other channel converts the processed voltage signal through the analog-to-digital converter U3, and finally transmits it to the main control module 4 for detection, and displays the data through the display module 6 and alarms. Module 7 issues an audible and visual alarm when there is overvoltage or when main control module 4 fails. When main control module 4 fails, redundant control module 5 will be controlled to take over the work of main control module 4; among them, in signal conditioning module 2 , the first operational amplifier A1 forms a voltage follower, which plays a buffering role for the subsequent unit to avoid interference with the sampling voltage signal; the second operational amplifier A2 and the third operational amplifier A3 form a high-speed, low-power voltage comparator , according to the value of the first reference voltage source V1 and the value of the second reference voltage source V2, determine whether the voltage of the electronic transformer J1 is within the normal range at this time. The value of the first reference voltage source V1 is the maximum allowable voltage, and the second reference voltage The source V2 value is the voltage value during overvoltage; the first program-controlled amplifier U2 can select its 1, 2, or 4 times gain to amplify the voltage signal through the first controller U1; the active filter composed of the fourth operational amplifier A4 eliminates The noise in the voltage signal and the burr signal generated by the coil; in the redundant control module 5, the first controller U1 controls the second controller U1-1 to take over the work through the cold start button K1, and performs data interaction through the asynchronous receiving and transmitting transmitter. The second controller U1-1 completes line switching by controlling the first multi-way strobe 501 and the second multi-way strobe 502.

The electronic transformer overvoltage measurement device provided by this application uses a capacitive transformer to extract the voltage signal from the secondary side of the electronic transformer. It is lower in cost and smaller than using a dedicated signal coil to sample the voltage signal. Necessary processing is required to improve the sampling accuracy of the signal, and a redundant controller is provided to prevent trouble caused by chip damage when the measuring device is working.

It is obvious to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be regarded as illustrative and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is therefore intended that all claims falling within the claims All changes within the meaning and scope of equivalent elements are included in the present invention. Any reference signs in the claims shall not be construed as limiting the claim in question.

In addition, it should be understood that although this specification is described in terms of implementations, not each implementation only contains an independent technical solution. This description of the specification is only for the sake of clarity, and those skilled in the art should take the specification as a whole. , the technical solutions in each embodiment can also be appropriately combined to form other implementations that can be understood by those skilled in the art.

Claims (13)

1. An electronic transformer overvoltage measuring device is composed of a signal extraction module, a signal conditioning module, an analog-to-digital conversion module, a main control module, a redundant control module, a display module and an alarm module, and is characterized in that,

the signal extraction module is used for extracting an output voltage signal of the electronic transformer and sending the voltage signal to the signal conditioning module;

the signal conditioning module is connected with the signal extraction module and is used for receiving the voltage signal output by the signal extraction module and comparing the voltage signal with a reference voltage twice; meanwhile, amplifying and filtering the voltage signal, and outputting an analog voltage signal obtained after the processing; the signal conditioning module comprises a buffering and straightening unit, a program-controlled amplifying unit, a signal comparing unit and a signal filtering unit; the first end of the buffering and straightening unit is connected with the signal extraction module, the second end of the buffering and straightening unit is connected with the first end of the program-controlled amplifying unit, the second end of the buffering and straightening unit is connected with the first end of the signal comparison unit, the second end of the program-controlled amplifying unit is connected with the first end of the signal filtering unit, the second end of the signal filtering unit is connected with the first end of the analog-to-digital conversion unit, and the second end of the signal comparison unit is connected with the main control module; the buffering and straightening unit is used for preventing the collected analog voltage signals from being influenced by the impedance of the program-controlled amplifying unit, playing a role of buffering and conducting straightening treatment on the analog voltage signals; the program-controlled amplifying unit is used for carrying out program-controlled gain amplifying treatment on the acquired analog voltage signals; the signal comparison unit is used for comparing the acquired analog voltage signal with a reference voltage; the signal filtering unit is used for eliminating noise in the analog voltage signal output by the program-controlled amplifying unit;

the analog-to-digital conversion module is connected with the signal conditioning module and is used for receiving the analog voltage signal output by the signal conditioning module, converting the analog voltage signal into a digital signal and outputting the digital signal;

the main control module is connected with the analog-to-digital conversion module and is used for receiving the digital signal output by the signal conditioning module and sending out an alarm signal when the digital signal is judged to be over-voltage;

the redundant control module is connected with the analog-to-digital conversion module and the main control module and is used for replacing the main control module to work when the main control module fails;

the display module is connected with the main control module and the redundant control module and is used for receiving and displaying data transmitted by the main control module or the redundant control module;

and the alarm module is connected with the main control module and the redundant control module and is used for receiving alarm signals sent by the main control module or the redundant control module and sending out alarms.

2. The device of claim 1, wherein the signal extraction module is configured to extract a voltage signal from a high voltage side of the electronic transformer using a capacitive transformer CVT.

3. The apparatus of claim 1, wherein the signal extraction module comprises an electronic transformer J1, a capacitive transformer CVT, a third capacitor C3, and a fourth capacitor C4;

the first end of capacitive mutual inductor CVT primary side is connected with third electric capacity C3 and fourth electric capacity C4, and the other end and the ground terminal of fourth electric capacity C4 are connected to the second end of capacitive mutual inductor CVT primary side, and the output of electronic transformer J1 secondary side is connected to the other end of third electric capacity C3.

4. The apparatus of claim 1, wherein the buffer blocking unit comprises a second resistor R2, a first op-amp A1, and a first capacitor C1;

the first end of capacitive mutual inductor CVT secondary side is connected with the homophase end of first operational amplifier A1, and the second ground of capacitive mutual inductor CVT secondary side is connected with the inverting terminal of first operational amplifier A1 and is connected with the first end of first electric capacity C1 and the output of first operational amplifier A1 through second resistance R2.

5. The apparatus of claim 1, wherein the programmable amplification unit comprises a first programmable amplifier U2.

6. The apparatus of claim 5, wherein the main control module comprises a first controller U1;

the fourth end of the first program-controlled amplifier U2 is connected with the second end of the first capacitor C1, the eighth end of the first program-controlled amplifier U2 is connected with the first power supply +12V, the third end of the first program-controlled amplifier U2 and the sixth end of the first program-controlled amplifier U2 are commonly connected with the ground end, and the first end and the second end of the first program-controlled amplifier U2 are respectively connected with the third IO end and the fourth IO end of the first controller U1.

7. The apparatus of claim 1, wherein the signal comparison unit comprises a second operational amplifier A2, a third operational amplifier A3, a third resistor R3, a fourth resistor R4, a first power supply +12v, a second power supply-12V, a first reference voltage source V1, and a second reference voltage source V2;

the same phase end of the second operational amplifier A2 and the same phase end of the third operational amplifier A3 are connected with the second end of the first capacitor C1 together, the opposite phase end of the second operational amplifier A2 is connected with the first reference voltage source V1, the opposite phase end of the third operational amplifier A3 is connected with the second reference voltage source V2, the third end of the second operational amplifier A2 is connected with the first power supply +12V and the third resistor R3, the other end of the third resistor R3 is connected with the output end of the second operational amplifier A2 and the first IO end of the first controller U1, the third end of the third operational amplifier A3 is connected with the first power supply +12V and the fourth resistor R4, and the other end of the fourth resistor R4 is connected with the output end of the third operational amplifier A3 and the second IO end of the first controller U1.

8. The apparatus of claim 7, wherein the second operational amplifier A2 and the third operational amplifier A3 determine whether the voltage of the electronic transformer is within a normal range according to the first reference voltage source V1 value and the second reference voltage source V2 value.

9. The apparatus of claim 5, wherein the signal filtering unit comprises a fifth resistor R5, a fourth op-amp A4, a sixth resistor R6, and a second capacitor C2;

the first end of the fifth resistor R5 is connected with the seventh end of the first program-controlled amplifier U2, the second end of the fifth resistor R5 is connected with the inverting end of the fourth operational amplifier A4, the sixth resistor R6 and the second capacitor C2, the non-inverting end of the fourth operational amplifier A4 is connected with the ground end, and the output end of the fourth operational amplifier A4 is connected with the other end of the sixth resistor R6, the other end of the second capacitor C2 and the analog-to-digital end of the analog-to-digital converter U3 included in the analog-to-digital data conversion module.

10. The device according to claim 1 or 9, wherein the analog-to-digital conversion module is a 16-bit external analog-to-digital converter U3 for converting the analog voltage signal into a digital signal.

11. The device of claim 1, wherein the main control module is configured to implement data collection and circuit control using a single chip or CPU.

12. The apparatus of claim 1, wherein the functions of the master control module further comprise:

and storing the digital signals output by the signal conditioning module.

13. The apparatus of claim 1, wherein the redundancy control module comprises a second controller U1-1, an asynchronous transceiver U4, a cold start key K1, a first multiplexing gate, and a second multiplexing gate;

the first end of the first multi-way gating is connected with the second end of the analog-to-digital conversion module, the input end of the second controller U1-1 is connected with the second end of the first multi-way gating, the input end of the second controller U1-1 is connected with the third end of the first multi-way gating, the first control end of the second controller U1-1 is connected with the fourth end of the first multi-way gating, the first controller U1 is connected with the second controller U1-1 through an asynchronous transceiver U4 and a cold start key K1 respectively, the output end of the first controller U1 is connected with the first end of the second multi-way gating, the output end of the second controller U1-1 is connected with the second end of the second multi-way gating, and the control end of the second controller U1-1 is connected with the third end of the second multi-way gating;

the first multipath strobe is used for controlling voltage signals to be input into the main control module and the redundant control module;

the second multipath strobe is used for controlling the main control module and the redundant control module to output digital signals and control signals;

the chip selected by the second controller U1-1 is the same as the chip selected by the first controller U1; the first multi-path gating and the second multi-path gating are controlled by the second controller U1-1, and all lines communicated with the first controller U1 are switched to corresponding lines of the second controller U1-1; the asynchronous transceiver U4 selects a universal asynchronous transceiver transmitter to transmit the data in the first controller U1 to the second controller U1-1; when the first controller U1 fails, the cold start key K1 instantly cuts off power to the second controller U1-1 and restarts.