CN101666826B - Overvoltage online monitoring device based on dual time base sampling technology - Google Patents

Abstract

An overvoltage monitoring device based on dual-time base sampling technology, including a resistance-capacitance high-voltage sensor, the signal output end of the resistance-capacity high-voltage sensor is connected to the input end of the double protection circuit of the signal conditioning unit through a double-shielded coaxial cable, and the signal conditioning The photoelectric isolation output of the unit is connected to the input of the photoelectric isolation module of the signal isolation unit, the output of the photoelectric isolation module is connected to the network port of the industrial control computer, and the isolated power output of the signal isolation unit is connected to the power input of the signal conditioning unit The signal conditioning unit of the present invention uses a dual-time base data acquisition module to redundantly collect the overvoltage signal waveform, which is not only suitable for the monitoring of the internal overvoltage of the power system, but also suitable for the monitoring of the external overvoltage of the power system, especially for lightning The effect of overvoltage is the most prominent, and it has the characteristics of improving the accuracy and stability of overvoltage online monitoring.

Description

Overvoltage On-Line Monitoring Device Based on Dual Time Base Sampling Technology

technical field

The invention belongs to an on-line overvoltage monitoring device of a power system, in particular to an on-line overvoltage monitoring device based on dual time base sampling technology.

Background technique

With the continuous development of power economy and the continuous improvement of users' requirements for power quality, the requirements for power system reliability are getting higher and higher. The reliability of the power system first depends on the reliability of the operation of electrical equipment. However, a large part of the damage accidents of electrical equipment are caused by insulation faults. Among them, the overvoltage of the power grid has a great impact on the insulation of power equipment, which is likely to cause damage to the insulation of power operating equipment, thereby causing power accidents and seriously affecting the power system. safe operation.

Overvoltage is an abnormal voltage exceeding the working voltage that occurs in the power system under certain conditions. It belongs to an electromagnetic disturbance phenomenon in the power system, and its types are various. Its waveform, voltage amplitude, duration and causes are all different. As far as its origin is concerned, overvoltage is divided into two types: external overvoltage, namely lightning overvoltage and internal overvoltage. Lightning overvoltage is the damage The most serious type of electric equipment, and its wave head is steep, the amplitude is high, and the time is extremely short, that is, it occurs instantaneously. In order to correctly analyze the causes of overvoltage accidents, a considerable number of different forms of overvoltage detection devices have been installed in the power system. After searching domestic and foreign patent documents online, the application number is [200510041795.1], and the name is a Chinese invention patent for the online detection method and device of multi-channel transient waveform overvoltage in power system. The device basically consists of a high-voltage divider and a signal conditioning unit , acquisition unit, and industrial computer, which realizes the on-line monitoring of the overvoltage of the power system, but its stability is poor, the anti-interference ability is poor, the accuracy of sampling is not high, the sampling rate cannot be flexibly set, and the measurement circuit is directly electrically connected to the primary equipment. , affecting safety, etc., especially for lightning overvoltage monitoring has certain limitations.

Contents of the invention

In order to overcome the deficiencies of the above-mentioned prior art, the object of the present invention is to provide an overvoltage online monitoring device based on dual time base sampling technology, which uses redundant acquisition of overvoltage signal waveforms based on dual acquisition modules, which is not only suitable for internal overvoltage monitoring of power systems. The voltage monitoring is also suitable for the monitoring of the external overvoltage of the power system, especially the lightning overvoltage effect is the most prominent, and it has the characteristics of improving the accuracy and stability of the overvoltage online monitoring.

In order to achieve the above object, the technical solution adopted by the present invention is: an overvoltage monitoring device based on dual time base sampling technology, which consists of a resistance-capacitance high-voltage sensor 1, a signal conditioning unit 2, a signal isolation unit 3, an industrial control computer 4, The photoelectric isolation module 5 and the isolated power supply 6 are composed. The signal output terminal of the RC high-voltage sensor 1 is connected to the input terminal of the double protection circuit of the signal conditioning unit 2 through a double-shielded coaxial cable, and the photoelectric isolation output terminal of the signal conditioning unit 2 is connected to the signal conditioning unit 2. The input terminal of the photoelectric isolation module 5 of the isolation unit 3 is connected, the output terminal of the photoelectric isolation module 5 is connected with the network port 7 of the industrial control computer 4, and the output terminal of the isolated power supply 6 of the signal isolation unit 3 is connected with the power input of the signal conditioning unit 2 end connected;

The signal conditioning unit 2 is composed of 3 groups of double protection circuits 8, 3 groups of pressure circuits 9, 3 groups of trigger circuits 10, a dual time base data acquisition module 11 and a first electro-optical isolation module 12. The signal input terminals of the double protection circuit 8 are connected to the Respective resistance-capacitance high-voltage sensor 1 signal output ends are connected, the signal output end of double protection circuit 8 is connected with the signal input end of voltage divider circuit 9, the signal output end of voltage divider circuit 9 is connected with the signal input end of trigger circuit 10, simultaneously The signal output end of voltage divider circuit 9 is connected with the input end of dual time base data acquisition module 11, the signal output end of trigger circuit 10 is connected with the trigger end of dual time base data acquisition module 11, the output of dual time base data acquisition module 11 The terminal is connected to the input terminal of the first electro-optical isolation module 12 .

The double protection circuit 8 includes a ceramic gas discharge tube DS1, the input terminal is connected to the signal output signal of the RC high-voltage sensor 1, and is connected with the ceramic gas discharge tube DS1, the first resistor R1, the first capacitor C1, the TVS tube D1 and The fifth resistor R5 is connected, the other end of the first capacitor C1 is connected to the second resistor R2, the other end of the ceramic gas discharge tube DS1, the first resistor R1, the second resistor R2 and the TVS tube D1 are grounded, and the other end of the fifth resistor R5 is output.

The input terminal of the voltage divider circuit 9 is connected to the non-inverting input terminal pin 14 of the operational amplifier U1, and is connected to the second capacitor C2 and the third capacitor C3, and the other end of the third capacitor C3 is connected to the third resistor R3. The other end of the second capacitor C2 and the third resistor R3 is grounded, the inverting input pin 13 of the operational amplifier U1 is connected to the fourth resistor R4, and the other end of the fourth resistor R4 is connected to the positive power supply pin 16 of the operational amplifier U1, and the operation The output pin 17 of the amplifier U1 is connected to the +12V DC power supply, the fourth capacitor C4 and the capacitor C5, the other end of the fourth capacitor C4 and the fifth capacitor C5 are grounded, and the negative power supply pin 15 of the operational amplifier U1 is connected to the -12V DC power supply 1. The sixth capacitor C6 is connected to the seventh capacitor C7, and the other ends of the sixth capacitor C6 and the seventh capacitor C7 are grounded.

The trigger circuit 10 includes a dual-threshold comparator U2, which is connected to the signal In terminal after the voltage division by the voltage divider circuit 9, and is connected to the sixth resistor R6 and the seventh resistor R7, and the other end of the sixth resistor R6 is compared with the double-threshold The INB- pin 24 of the comparator U2 is connected to the eleventh resistor R11, the other end of the seventh resistor R7 is connected to the INA+ pin 26 of the dual-threshold comparator U2, and the eighth resistor R8 is connected, the eleventh resistor R11, the eighth resistor The other end of 8 is grounded, the INB-pin 24 of the double-threshold comparator U2 is connected to the movable end of the second adjustable potentiometer RP2 and the tenth capacitor C10, and the initial end of the second adjustable potentiometer RP2 is connected to the double-threshold comparator The V-pin 23 of U2 is connected to the eleventh capacitor C11 and the second inductance L2, the other end of the second inductance L2 is connected to the DC power supply -5V and the electrolytic capacitor C12, the end of the second adjustable potentiometer RP2, the tenth The other end of a capacitor C11 and electrolytic capacitor C12 is grounded, the INB+ pin 27 of the dual-threshold comparator U2 is connected to the movable end of the first adjustable potentiometer RP1 and the ninth capacitor C9, and the initial end of the first adjustable potentiometer RP1 It is connected with the +V pin 28 of the dual-threshold comparator U2, the eighth capacitor C8, and the first inductor L1, and the other end of the first inductor L1 is connected with the +5V DC power supply and the capacitor C13, and the end of the first adjustable potentiometer RP1 Grounding, the other end of the eighth capacitor C8, the thirteenth capacitor C13, and the ninth capacitor C9 are grounded, the 2-pin 19 of the dual-threshold comparator U2 is connected to the tenth resistor R10, and the 15-pin 32 of the dual-threshold comparator U2 and The ninth resistor R9 is connected, the GND pin 20, LEA pin 21, NC pin 22, NC pin 29, LEB pin 30, GND pin 31 of the dual-threshold comparator U2 are grounded, the ninth resistor R9, the tenth The other end of the resistor R10 is grounded, the QA pin 18 of the dual-threshold comparator U2 is connected to the thirteenth resistor R13 and the second diode D2, and the QB pin 33 of the dual-threshold comparator U2 is connected to the twelfth resistor R12 and the second diode D2. The three diodes D3 are connected, the twelfth resistor R12 and the thirteenth resistor R13 are grounded, the second diode D2 and the third diode D3 are connected to serve as the OUT output terminal.

Described dual time base data acquisition module 11 comprises amplifier 34, and the signal output end of amplifier 34 is connected with the signal input end of precision attenuation filter 35, the signal output end of precision attenuation filter 35 is connected with the signal input end of converter 36, converts The signal output end of device 36 is connected with the input end of configuration logic circuit 37, the signal input end of the amplifier 34 of two dual-time base data acquisition modules 11 is connected with the output end OUT of voltage divider circuit 9, and the output end of trigger circuit 10 is also connected. Be connected with the signal input end of amplifier 34, the output end of configuration logic circuit 37 namely the output end of dual time base data acquisition module 11 is connected with the input end of the first electro-optical isolation module 12, the output end of the first electro-optical isolation module 12 is connected with the photoelectric The input terminals of the isolation module 5 are connected.

The invention can monitor on-line in real time and automatically track the overvoltage inside and outside the power system, and can record the overvoltage waveform and related information completely and accurately at the same time when the overvoltage occurs; the protection circuit completes the matching conversion of the signal, which improves the safety of the system The pressure circuit divides the voltage again, follows the output, meets the needs of the input matching of the acquisition module, and at the same time makes the signal undistorted, providing a true and reliable signal that can be collected for subsequent accurate digital-to-analog conversion. The real-time sampling rate of the acquisition card used can reach 25MS/s, and the sampling rate can be set from 1KS/s to 25MS/s; each channel has 8M large-capacity onboard memory; the dual-time base data acquisition module 11 has 3 simultaneous sampling Channel, which can record the three-phase waveforms of bus A, B, and C. Dual modules are redundant, and the same waveform can be collected at different sampling rates and sampling lengths. One module is set to high sampling rate and low sampling length to mainly record the details of the waveform. The other module is set to low sampling rate and high sampling length to mainly record the whole process of the waveform, which solves the problem of sampling rate and storage depth well, and provides a strong guarantee for the comprehensive analysis and research of the waveform. Simultaneously, the signal isolation unit 3 provides an isolated power supply for the signal conditioning unit 2, and the dual-time base data acquisition module 11 communicates the processed digital signal with the industrial computer after electro-optical-to-optical conversion, which improves the anti-electromagnetic interference capability and The measurement accuracy of the system is improved, and at the same time, the electrical isolation of the primary equipment of the substation and the secondary measurement system is achieved in terms of safety. The invention has long-term operation stability, high measurement accuracy and safety.

Performance index of the present invention is as follows:

1. Measurement voltage error of the present invention: <2%;

2. The square wave response time of the present invention is less than 40ns (overshoot is not more than 5%);

3. Insulation level of resistance-capacitance high-voltage sensor 1: short-time (1min) power frequency withstand voltage (root mean square value): >105kV; lightning impulse voltage (peak value): >280kV; withstand operating overvoltage (peak value) ＞240kV

4. The sampling rate of dual time base data acquisition module 11 can be set within the range of 1KS/s to 25MS/s; the sampling length is adjustable, and each channel can reach up to 4M points;

5. The trigger threshold voltage of the trigger circuit 10 can be set arbitrarily within the range of 1-5 times of the rated voltage.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

FIG. 2 is a schematic structural diagram of the signal conditioning unit 2 of the present invention.

FIG. 3 is a structural schematic diagram of the double protection circuit 8 and the voltage dividing circuit 9 of the present invention.

FIG. 4 is a structural principle diagram of the trigger circuit 10 of the present invention.

Fig. 5 is a structural diagram of the dual time base data acquisition module 11 of the present invention.

Detailed ways

The structural principle and working principle of the present invention will be further described in detail below in conjunction with the accompanying drawings.

Referring to Figure 1, an overvoltage monitoring device based on dual time base sampling technology includes a RC high-voltage sensor 1, and the signal output terminal of the RC high-voltage sensor 1 is double-protected by a double-shielded coaxial cable and a signal conditioning unit 2 The input terminals of the circuit are connected, the output terminal of the photoelectric isolation of the signal conditioning unit 2 is connected with the input terminal of the photoelectric isolation module 5 of the signal isolation unit 3, the output terminal of the photoelectric isolation module 5 is connected with the network port 7 of the industrial control computer 4, and the signal isolation The output end of the isolated power supply 6 of the unit 3 is connected to the power input end of the signal conditioning unit 2 .

With reference to Fig. 2, described signal conditioning unit 2 comprises 3 groups of double protection circuits 8, and the signal input end of double protection circuit 8 is connected with respective RC high-voltage sensor 1 signal output end, and the signal output end of double protection circuit 8 is connected with branch The signal input end of voltage divider circuit 9 is connected, and the signal output end of voltage divider circuit 9 is connected with the signal input end of trigger circuit 10, and the signal output end of voltage divider circuit 9 is connected with the input end of dual time base data acquisition module 11 simultaneously, triggers The signal output end of the circuit 10 is connected to the trigger end of the dual time base data acquisition module 11 , and the output end of the dual time base data acquisition module 11 is connected to the input end of the first electro-optical isolation module 12 .

Referring to FIG. 3 , the dual protection circuit 8 includes a ceramic gas discharge tube, a TVS tube, a capacitor, and a resistor. The input terminal is connected to the output signal of the RC high-voltage sensor 1, and connected to the ceramic gas discharge tube DS1, resistor R1, capacitor C1, TVS tube D1 and resistor R5, the other end of the capacitor C1 is connected to the resistor R2, and the ceramic gas discharge tube DS1, The other end of the resistor R1, the resistor R2 and the TVS tube D1 is grounded, and the other end of the resistor R5 is the output end. The double protection circuit 8 is synchronously inputting the three-phase voltage of a section of the busbar, so secondary protection can be performed to ensure the safety of system equipment and staff.

Referring to Fig. 3, the input terminal of the described voltage divider circuit 9 is connected to the non-inverting input terminal pin 14 of the operational amplifier U1, and is connected to the capacitor C2 and the capacitor C3, and the other end of the capacitor C3 is connected to the resistor R3, and the capacitor C1 and the resistor R3 are connected to each other. The other end of the operational amplifier U1 is grounded, the inverting input pin 12 of the operational amplifier U1 is connected to the resistor R4, the other end of the resistor R4 is connected to the pin 16 of the operational amplifier U1, and the pin 17 of the operational amplifier U1 is connected to +12V DC power supply and capacitor C4 Connected to capacitor C5, capacitor C4 and the other end of capacitor C5 are grounded, pin 15 of operational amplifier U1 is connected to -12V DC power supply, capacitor C6 and capacitor C7, and the other end of capacitor C6 and capacitor C7 is grounded. The voltage divider circuit 9 again divides the output signal of a three-phase voltage parallel sensor on a section of the bus, and at the same time meets the input matching requirements of the acquisition module, ensuring that the signal is not distorted within the required range and can be measured accurately.

With reference to Fig. 4, described trigger circuit 10 comprises double-threshold comparator, inductance, adjustable potentiometer, electric capacity, resistance, diode, connects the signal In end after voltage dividing circuit 9 divides voltage, and links to each other with resistance R6, R7, The other end of the resistor R6 is connected to the INB- pin 24 of the dual-threshold comparator U2 and the resistor R11, the other end of R7 is connected to the INA+ pin 26 of the dual-threshold comparator U2 and the resistor R8, and the resistor R11 is connected to the other end of the resistor 8 Grounded, the INB-pin 25 of the dual-threshold comparator U2 is connected to the movable end of the adjustable potentiometer RP2 and the capacitor C11, the initial end of the adjustable potentiometer RP2 is connected to the V-pin 23 of the dual-threshold comparator U2, and the capacitor C11 , inductor L2, the other end of inductor L2 is connected to DC power supply -5V, electrolytic capacitor C12, the end of adjustable potentiometer RP2, capacitor C11, and the other end of electrolytic capacitor C12 are grounded, and the INB+ pin 27 of the dual-threshold comparator U2 It is connected to the movable end of the adjustable potentiometer RP1 and the capacitor C9, the initial end of the adjustable potentiometer RP1 is connected to the +V pin 28 of the dual-threshold comparator U2, the capacitor C8, and the inductor L1, and the other end of the inductor L1 is connected to +5V The DC power supply is connected to the capacitor C13, the end of the adjustable potentiometer RP1 is grounded, the other end of the capacitor C8, capacitor C13, and capacitor C9 is grounded, the pin 19 of the dual-threshold comparator U2 is connected to the resistor R10, and the pin 19 of the dual-threshold comparator U2 15 pin 32 is connected to resistor R9, GND pin 20, LEA pin 21, NC pin 22, NC pin 29, LEB pin 30, GND pin 31 of the dual-threshold comparator U2 are grounded, resistor R9, resistor The other end of R10 is grounded, the QA pin 18 of the dual-threshold comparator U2 is connected to the resistor R13 and the diode D2, the QB pin 33 of the dual-threshold comparator U2 is connected to the resistor R12 and the diode D3, the resistor R12 and the resistor R13 are grounded, and the diode D2 and diode D3 are connected as OUT output terminal. The trigger circuit 10 can judge respectively for a section of busbar three-phase voltage signal, whether to generate a trigger signal, and compare the preset trigger signal level with the real-time signal after bus voltage division. Trigger signals are usually generated, and the three phases are independent. After comparison, a certain phase, two phases or three phases generate trigger signals at the same time.

With reference to Fig. 5, described dual time base data acquisition module 11 comprises amplifier 34, and the signal output end of amplifier 34 is connected with the signal input end of precision attenuation filter 35, the signal output end of precision attenuation filter 35 and the signal input of converter 36 The signal output terminal of the converter 36 is connected with the input terminal of the configuration logic circuit 37, the signal input terminal of the amplifier 34 of the two dual-time base data acquisition modules 11 is connected with the OUT output terminal of the voltage divider circuit 9, and the trigger circuit 10 The output end of the output end is also connected with the signal input end of the amplifier 34, the output end of the configuration logic circuit 37, that is, the output end of the dual time base data acquisition module 11, is connected with the input end of the first electro-optical isolation module 12, and the output end of the first electro-optical isolation module 12 The output end is connected with the input end of the photoelectric isolation module 5 .

The working principle of the present invention is:

The application process of the present invention in power system overvoltage online monitoring is as follows:

Step 1: The overvoltage on-line monitoring device based on dual time base sampling technology is powered on and the parameters are set and initialized, and the overvoltage trigger level is set at 1.5 times the rated voltage or adjusted according to user needs;

Second step: the dual time base data acquisition module 11 in the overvoltage online monitoring device based on dual time base sampling technology is collecting signal waveforms, waiting for the trigger circuit 10 to transmit a trigger signal;

The third step: judge whether there is an overvoltage, when the absolute value of the voltage amplitude measured based on the dual time base data acquisition module 11 online monitoring device is not less than a given value, it is determined that there is an overvoltage in the power grid, and now the dual time base data The acquisition module 11 performs data storage according to the pre-trigger setting; when the absolute value of the voltage amplitude measured by the online monitoring device is less than a given value, the system repeats the second step;

Step 4: upload the data collected by the dual time base data acquisition module 11 to the industrial control computer 4; the industrial control computer 4 stores the signal uploaded by the dual data acquisition module into its cache, and stores it in its hard disk in the form of a file;

Step 7: Determine whether the data storage is completed, and re-execute the second step after the data storage is completed.

The acquisition program of the present invention mainly realizes on-line monitoring, automatic tracking, and data waveform storage of the overvoltage, and the multi-input oscilloscope designed with a virtual instrument realizes query, operation, digital filtering, Analysis and other functions. First perform data query settings through the database, complete the selected data call, and then select the channel, perform detailed operations on the waveform, conduct research and analysis through spectrum conversion, digital filtering, etc., and finally output through the report.

When there is an overvoltage in the power grid, after the voltage signal is divided by the resistance-capacitance high-voltage sensor, the lower voltage signal is transmitted to the signal conditioning unit through a double-shielded coaxial cable, and the lower voltage signal in the signal conditioning unit is divided. After that, it is sent to the dual-time base data acquisition module. After the trigger signal, the dual-time base data acquisition module collects the data and uploads it to the industrial computer, which stores, echoes and analyzes the data.

Claims (3)

1. over-voltage monitoring device based on the dual time base Sampling techniques; It is characterized in that; Form by capacitance-resistance high-voltage sensor (1), signal condition unit (2), Signal Spacing unit (3), industrial control computer (4), photoelectric isolation module (5) and insulating power supply (6); Capacitance-resistance high-voltage sensor (1) signal output part links to each other with two holding circuit input ends of signal condition unit (2) through double shield layer concentric cable; The input end that the photoelectricity of signal condition unit (2) is isolated the photoelectric isolation module (5) of output terminal and Signal Spacing unit (3) links to each other; The network interface (7) of the output terminal of photoelectric isolation module (5) and industrial control computer (4) links to each other, and insulating power supply (6) output terminal of synchronous signal isolated location (3) and the power input of signal condition unit (2) link to each other;

Signal condition unit (2) is made up of 3 groups of two holding circuits (8), 3 component volt circuits (9), 3 groups of trigger circuit (10), dual time base data acquisition module (11) and first electric light isolation modules (12); The signal input part of two holding circuits (8) links to each other with capacitance-resistance high-voltage sensor (1) signal output part separately; The signal output part of two holding circuits (8) links to each other with the signal input part of bleeder circuit (9); The signal output part of bleeder circuit (9) links to each other with the signal input part of trigger circuit (10); The signal output part of bleeder circuit (9) and the input end of dual time base data acquisition module (11) link to each other simultaneously; The signal output part of trigger circuit (10) links to each other with the trigger end of dual time base data acquisition module (11), and the output terminal of dual time base data acquisition module (11) links to each other with the input end of the first electric light isolation module (12);

The in-phase input end pin (14) of the input termination operational amplifier (U1) of described bleeder circuit (9); And link to each other with second electric capacity (C2), the 3rd electric capacity (C3); The other end of the 3rd electric capacity (C3) links to each other with the 3rd resistance (R3); The other end ground connection of second electric capacity (C2), the 3rd resistance (R3); The inverting input pin (13) of operational amplifier (U1) connects the 4th resistance (R4); The positive supply pin (16) of the other end of the 4th resistance (R4) and operational amplifier (U1) links to each other, and the output pin (17) of operational amplifier (U1) links to each other the other end ground connection of the 4th electric capacity (C4) and the 5th electric capacity (C5) with+12V direct supply, the 4th electric capacity (C4) and the 5th electric capacity (C5); The negative supply pin (15) of operational amplifier (U1) links to each other the other end ground connection of the 6th electric capacity (C6) and the 7th electric capacity (C7) with-12V direct supply, the 6th electric capacity (C6) with the 7th electric capacity (C7);

Described trigger circuit (10) connect signal (In) end after bleeder circuit (9) dividing potential drop; And link to each other with the 6th resistance (R6), the 7th resistance (R7); INB-pin (24), the 11 resistance (R11) of the other end of the 6th resistance (R6) and double threshold comparer (U2) link to each other; INA+ pin (26), the 8th resistance (R8) of the other end of the 7th resistance (R7) and double threshold comparer (U2) link to each other; The other end ground connection of the 11 resistance (R11), the 8th resistance (8); The INB-pin (24) of double threshold comparer (U2) links to each other with second adjustable potentiometer (RP2) movable end, the tenth electric capacity (C10); V-pin (23), the 11 electric capacity (C11), second inductance (L2) of the first end of second adjustable potentiometer (RP2) and double threshold comparer (U2) link to each other; The other end of second inductance (L2) links to each other with direct supply-5V, electrochemical capacitor (C12); The other end ground connection of the end of second adjustable potentiometer (RP2), the 11 electric capacity (C11), electrochemical capacitor (C12); The INB+ pin (27) of double threshold comparer (U2) links to each other with first adjustable potentiometer (RP1) movable end, the 9th electric capacity (C9); The first end of first adjustable potentiometer (RP1) and double threshold comparer (U2)+V pin (28), the 8th electric capacity (C8), first inductance (L1) link to each other; The other end of first inductance (L1) links to each other the terminal ground connection of first adjustable potentiometer (RP1), the other end ground connection of the 8th electric capacity (C8), the 13 electric capacity (C13), the 9th electric capacity (C9) with+5V direct supply and the 13 electric capacity (C13); 2 pins (19) of double threshold comparer (U2) link to each other with the tenth resistance (R10); 15 pins (32) of double threshold comparer (U2) link to each other with the 9th resistance (R9), the GND pin (20) of double threshold comparer (U2), LEA pin (21), NC pin (22), NC pin (29), LEB pin (30), GND pin (31) ground connection, the other end ground connection of the 9th resistance (R9), the tenth resistance (R10); The QA pin (18) of double threshold comparer (U2) links to each other with the positive pole of the 13 resistance (R13), second diode (D2); The QB pin (33) of double threshold comparer (U2) links to each other with the positive pole of the 12 resistance (R12), the 3rd diode (D3), the other end ground connection of the 12 resistance (R12), the 13 resistance (R13), and the negative pole of the negative pole of second diode (D2), the 3rd diode (D3) links to each other as the OUT output terminal.

2. over-voltage monitoring device according to claim 1; It is characterized in that; The output signal of described pair of holding circuit (8) input termination capacitance-resistance high-voltage sensor (1); And link to each other with the 5th resistance (R5) with ceramic gas discharge tube (DS1), first resistance (R1), first electric capacity (C1), TVS pipe (D1); First electric capacity (C1) other end links to each other with second resistance (R2), ceramic gas discharge tube (DS1), first resistance (R1), second resistance (R2) and TVS pipe (D1) other end ground connection, and the other end of the 5th resistance (R5) is an output terminal.

3. over-voltage monitoring device according to claim 1; It is characterized in that; Described dual time base data acquisition module (11) comprises amplifier (34); The signal output part of amplifier (34) links to each other with the signal input part of accurate attenuation filter (35), the signal input part of the signal output part of accurate attenuation filter (35) and converter (36) links to each other; The signal output part of converter (36) links to each other with the input end of configuration logic (37); The signal input part of the amplifier (34) of two dual time base data acquisition modules (11) links to each other with the output terminal (OUT) of bleeder circuit (9); The output terminal of trigger circuit (10) also links to each other with the signal input part of amplifier (34), and the output terminal of configuration logic (37) is that the output terminal of dual time base data acquisition module (11) and the input end of the first electric light isolation module (12) link to each other, and the output terminal of the first electric light isolation module (12) links to each other with the input end of photoelectric isolation module (5).

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