CN112904116B - System and method for evaluating dynamic characteristics of valve plate of lightning arrester under action of impulse current - Google Patents

Abstract

The present application provides a system and method for evaluating the dynamic characteristics of a surge arrester valve plate under the action of an impulse current. The system includes a test box and a temperature and humidity measuring component, which is configured to measure the temperature and humidity values inside the test box and send them to a host computer. The temperature and humidity adjustment component is configured to respond to the upper computer and adjust the temperature and humidity inside the test chamber. The inrush current generating component is configured to respond to the upper computer and output the inrush current. The metal electrode forms electrical contact with the arrester valve plate. In the dynamic characteristic measurement component, the host computer is further configured to obtain the inrush current waveform and the overvoltage waveform measured by the dynamic measurement component, and obtain the inrush current amplitude, the wave front time and the overvoltage amplitude. The dynamic characteristic evaluation factor is calculated according to the inrush current amplitude, wave front time and overvoltage amplitude. The present application provides a system capable of eliminating the influence of environmental factors on the dynamic characteristics of the arrester valve plate. The dynamic characteristics of the arrester valve can be accurately evaluated to ensure the safety of the power system.

Description

A system and method for evaluating the dynamic characteristics of arrester valve plates under the action of impulse current

technical field

The present application relates to the field of arrester performance evaluation, and in particular, to a system and method for evaluating the dynamic characteristics of a surge arrester valve plate under the action of an impulse current.

Background technique

Natural phenomena such as lightning will generate overvoltage, which is harmful to the power equipment in the power system. Therefore, a lightning arrester is required to release the overvoltage on the power equipment. With the long-term operation of the arrester, the main components of the arrester are easily degraded by the influence of environmental factors, resulting in weak dynamic performance. Therefore, it is necessary to evaluate the dynamic characteristics of the arrester valve.

The general dynamic characteristic evaluation method is to detect the full current or leakage current of the arrester during normal operation, obtain the evaluation factor, and use the evaluation factor to judge the dynamic performance of the arrester valve.

This evaluation method can only reflect the performance of the arrester valve plate when it is subjected to power frequency voltage, but cannot reflect the dynamic characteristics of the arrester valve plate under the action of inrush current, and cannot exclude the influence of environmental factors such as temperature and humidity on the dynamic performance of the arrester valve plate. The dynamic performance conclusions drawn are inaccurate.

SUMMARY OF THE INVENTION

The present application provides a system and method for evaluating the dynamic characteristics of a surge arrester valve plate under the action of an impulse current, so as to solve the problem of inaccurate conclusion of the dynamic performance of the traditional evaluation method.

In one aspect, the present application provides a system for evaluating the dynamic characteristics of an arrester valve plate under the action of an inrush current, including:

test box;

a temperature and humidity measuring component arranged inside the test box, the temperature and humidity measuring component is configured to: measure the temperature and humidity value inside the test box and send it to the upper computer;

a temperature and humidity adjustment component arranged inside the test box, the temperature and humidity adjustment component is configured to: respond to the upper computer and adjust the temperature and humidity inside the test box;

an inrush current generating component, the inrush current generating component is configured to: respond to the upper computer and output the inrush current;

a metal electrode, the metal electrode is arranged inside the test box, the metal electrode is electrically connected with the inrush current generating component through a current injection lead wire, and the metal electrode is in electrical contact with the arrester valve plate;

a dynamic characteristic measurement component, the dynamic characteristic measurement component includes a current sensor, a high-voltage probe and a data collector, the current sensor and the high-voltage probe are respectively connected to the upper machine through the data collector; the current sensor sleeve set on the current injection lead; the high-voltage probe is set inside the test box and is in electrical contact with the arrester valve plate;

The host computer is further configured to: acquire the impulse current waveform measured by the current sensor to obtain the impulse current amplitude and wave front time; acquire the overvoltage waveform measured by the high-voltage probe to obtain the overvoltage amplitude; The inrush current amplitude, the wave front time, and the overvoltage amplitude calculate a dynamic characteristic evaluation factor.

Optionally, the calculation formula of the dynamic characteristic evaluation factor is as follows:

k is the evaluation factor of the dynamic characteristics of the arrester valve plate, U _p is the amplitude of overvoltage on the arrester valve plate; I _p is the amplitude of the surge current, Δt is the wave front time of the surge current, and exp is the exponential function with the natural constant e as the base;

Among them, if k∈[0,0.2) means that the dynamic characteristics of the arrester valve plate are excellent, if k∈[0.2,0.5) means that the dynamic characteristics of the arrester valve plate are better, and if k∈[0.5,1) means that the dynamic characteristics of the arrester valve plate are Poor, if k∈[1,+∞), it means that the dynamic characteristics of the arrester valve are extremely poor.

Optionally, the temperature and humidity measurement component includes a first temperature and humidity sensor, a second temperature and humidity sensor, a third temperature and humidity sensor, and a temperature and humidity measurement mechanism, the first temperature and humidity sensor, the second temperature and humidity sensor and The third temperature and humidity sensors are respectively arranged on the inner wall of the test box, and the first temperature and humidity sensor, the second temperature and humidity sensor and the third temperature and humidity sensor communicate with the The upper electromechanical connection.

Optionally, the temperature and humidity adjustment assembly includes a temperature adjustment mechanism and a humidity adjustment mechanism, and the temperature adjustment mechanism and the humidity adjustment mechanism are arranged inside the test box and are electrically connected to the upper position.

Optionally, the host computer is further configured to: acquire the temperature and humidity values sent by the first temperature and humidity sensor, the second temperature and humidity sensor, and the third temperature and humidity sensor, and calculate the difference between the three temperature and humidity values. The mean value of temperature and humidity, if the mean value of temperature and humidity is equal to a preset value, a start-up instruction is generated; the inrush current generating component is further configured to output an inrush current in response to the start-up instruction.

Optionally, the host computer is further configured to: if the average temperature and humidity value is greater than a preset value, generate a lowering instruction; the temperature and humidity adjusting component is further configured to: lower the temperature and dehumidify in response to the lowering instruction.

Optionally, the host computer is further configured to: if the average temperature and humidity value is less than a preset value, generate a raising command; the temperature and humidity adjusting component is further configured to: in response to the raising command, raise temperature and humidify.

Optionally, the metal electrode includes a first metal electrode and a second metal electrode, the first metal electrode is connected to the current injection lead, and the second metal electrode is grounded.

Optionally, the inrush current generating component includes an inrush current generator and an inrush current generation controller, the output end of the inrush current generator is connected to the current injection lead, and the control end is electrically connected through the inrush current generation controller. the upper computer.

On the other hand, the present application provides a method for evaluating the dynamic characteristics of an arrester valve plate under the action of an inrush current, including:

Measure the temperature and humidity inside the test box and send it to the host computer;

Respond to the host computer and adjust the temperature and humidity inside the test box;

Respond to the host computer and output impulse current;

Obtain the impulse current waveform measured by the current sensor, and obtain the impulse current amplitude and wave front time;

Obtain the overvoltage waveform measured by the high-voltage probe, and obtain the overvoltage amplitude;

A dynamic characteristic evaluation factor is calculated according to the surge current magnitude, the wave front time, and the overvoltage magnitude.

It can be seen from the above technical solutions that the present application provides a system and method for evaluating the dynamic characteristics of a surge arrester valve plate under the action of an inrush current. host computer. The temperature and humidity adjustment component is configured to respond to the upper computer and adjust the temperature and humidity inside the test chamber. The inrush current generating component is configured to respond to the upper computer and output the inrush current. The metal electrode forms electrical contact with the arrester valve plate. In the dynamic characteristic measurement component, the host computer is further configured to obtain the inrush current waveform and the overvoltage waveform measured by the dynamic measurement component, and obtain the inrush current amplitude, the wave front time and the overvoltage amplitude. The dynamic characteristic evaluation factor is calculated according to the inrush current amplitude, wave front time and overvoltage amplitude. The present application provides a system capable of eliminating the influence of environmental factors on the dynamic characteristics of the arrester valve plate. The dynamic characteristics of the arrester valve can be accurately evaluated to ensure the safety of the power system.

Description of drawings

In order to illustrate the technical solutions of the present application more clearly, the accompanying drawings required in the embodiments will be briefly introduced below. Obviously, for those of ordinary skill in the art, without creative work, the Additional drawings can be obtained from these drawings.

1 is a schematic structural diagram of a system for evaluating the dynamic characteristics of a surge arrester valve plate under the action of an inrush current of the present application;

2 is another structural schematic diagram of a system for evaluating the dynamic characteristics of a surge arrester valve plate under the action of an impulse current of the present application;

3 is a schematic diagram of the configuration of a host computer according to an embodiment of the present application;

FIG. 4 is a schematic flowchart of a dynamic evaluation method for a surge arrester valve plate under the action of an inrush current according to the present application.

Detailed ways

Embodiments will be described in detail below, examples of which are illustrated in the accompanying drawings. Where the following description refers to the drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following examples are not intended to represent all implementations consistent with this application. are merely exemplary of systems and methods consistent with some aspects of the present application as recited in the claims.

Referring to FIG. 1 , it is a schematic structural diagram of a system for evaluating the dynamic characteristics of a surge arrester valve plate under the action of an inrush current of the present application. Referring to FIG. 2 , it is another structural schematic diagram of a system for evaluating the dynamic characteristics of a surge arrester valve plate under the action of an inrush current of the present application. As can be seen from Figures 1 and 2, the system includes: a test box 1, the test box 1 can be a cube with a size of 1m*0.8m*0.6m and a material of acrylic, and the two opposite faces of the test box 1 A wire hole can be opened, the arrester valve plate is placed inside the test box 1, and the wire hole can make the arrester valve plate and other components electrically connected. The test box 1 can provide an environment for evaluating the dynamic characteristics of the arrester valve plate.

The resistance value of the arrester valve plate is easily affected by temperature and humidity. The higher the temperature and humidity, the lower the resistance value. Therefore, the environment inside the test box 1 can be set as the standard atmospheric reference condition. The system further includes a temperature and humidity measurement component 2 disposed inside the test box, and the temperature and humidity measurement component 2 is configured to measure the temperature and humidity values inside the test box 1 and send them to the host computer 4 . The system further includes a temperature and humidity adjustment component 3 disposed inside the test box, and the temperature and humidity adjustment component 3 is configured to: respond to the upper computer 4 and adjust the temperature and humidity inside the test box 1 . The upper computer 4 can issue adjustment instructions to the test box 1 . The temperature and humidity measuring component 2 can play the role of measuring the temperature and humidity in the test box 1, and the temperature and humidity adjusting component 3 can play the role of adjusting the temperature and humidity in the test box 1 to a standard atmospheric reference condition.

Further, the temperature and humidity measuring component 2 includes a first temperature and humidity sensor 21, a second temperature and humidity sensor 22, a third temperature and humidity sensor 23 and a temperature and humidity measuring mechanism 24. Two temperature and humidity sensors 22 and the third temperature and humidity sensor 23 are respectively disposed on the inner wall of the test box 1 . The first temperature and humidity sensor 21 , the second temperature and humidity sensor 22 and the third temperature and humidity sensor 23 is electrically connected to the upper computer 4 through the temperature and humidity measuring mechanism 24 . The first temperature and humidity sensor 21, the second temperature and humidity sensor 22 and the third temperature and humidity sensor 23 can be respectively arranged on the right side, left side and the center of the front side of the test box 1. Specifically, The setting method can be designed according to the actual situation, which is not specifically limited in this application. The three temperature and humidity sensors can fully measure the temperature and humidity at different positions in the test box 1, making the temperature and humidity measurement values more meaningful for reference.

Further, the temperature and humidity adjustment assembly 3 includes a temperature adjustment mechanism 31 and a humidity adjustment mechanism 32. The temperature adjustment mechanism 31 and the humidity adjustment mechanism 32 are arranged inside the test box 1, and are electrically connected to the upper computer 4. connect. The temperature adjustment mechanism 31 can increase or decrease the temperature in the test chamber 1 , and the humidity adjustment mechanism 32 can increase or decrease the humidity in the test chamber 1 .

In practical applications, the host computer 4 can judge whether the environment in the test box 1 is equivalent to the standard atmospheric environment according to the temperature and humidity values sent by the temperature and humidity measuring mechanism 24 , if not, the host computer 4 can control the temperature adjustment mechanism through instructions 31 and the humidity adjustment mechanism 32, so that the environment in the test chamber 1 is equivalent to the standard atmospheric environment.

The system further includes an inrush current generating component 5, and the inrush current generating component 5 is configured to: respond to the upper computer 4 and output the inrush current. The host computer 4 can send a start command to the inrush current generating component 5 . In practical applications, the inrush current generating component 5 can output an inrush current for evaluating the dynamic characteristics of the arrester valve plate.

The inrush current generating component 5 includes an inrush current generator 51 and an inrush current generation controller 52 . The output end of the inrush current generator 51 is connected to the current injection lead 6 , and the control end passes through the inrush current generation controller 52 . The upper computer is electrically connected.

Further, referring to FIG. 3 , it is a schematic diagram of the configuration of the upper computer according to the embodiment of the present application. The host computer 4 is further configured to: obtain the temperature and humidity values sent by the first temperature and humidity sensor 21, the second temperature and humidity sensor 22, and the third temperature and humidity sensor 23, and calculate the sum of the three temperature and humidity values. The mean value of temperature and humidity, if the mean value of temperature and humidity is equal to a preset value, a start-up instruction is generated; the inrush current generating component 5 is further configured to output an inrush current in response to the start-up instruction. Wherein, the start command includes the current peak value I and peak time t ₁ of the inrush current that the inrush current generator 51 needs to output. In practical applications, the inrush current generation controller 52 can respond to the start-up instruction, obtain the current peak value I and the peak time _t1 contained in the start-up instruction, and send them to the inrush current generator 51, and the inrush current generator 51 outputs the corresponding rush current.

The host computer 4 may also be configured to: if the average temperature and humidity value is greater than a preset value, generate a lowering command; the temperature and humidity adjusting component 3 may be further configured to: lower the temperature and dehumidify in response to the lowering command. The host computer 4 may also be configured to: if the average temperature and humidity value is less than a preset value, generate a raising command; the temperature and humidity adjusting component 3 may be further configured to: in response to the raising command, raise temperature and humidify. The preset values are the temperature t ₀ =20° C. and the absolute humidity h _{0 =} 11g/m ³ under standard reference atmospheric conditions. After the environment in the test box 1 is adjusted to a preset value through the temperature and humidity adjustment component 3, the dynamic performance evaluation of the arrester valve plate can be carried out. The lowering command and the raising command may include the difference that needs to be lowered or raised. adjust. This adjustment process stops when the average temperature and humidity are equal to the preset value.

The system further includes a metal electrode 7, which is arranged inside the test box 1, the metal electrode 7 is electrically connected with the inrush current generating component 5 through the current injection lead 6, and the metal electrode 7 is connected to the test chamber 1. The arrester valve plates make electrical contact. The metal electrode 7 may include a first metal electrode 71 and a second metal electrode 72, the first metal electrode 71 is connected to the current injection lead 6, and the second metal electrode 72 is grounded. The metal electrode 7 can be in good electrical contact with the arrester valve sheet at a certain pressure, and plays the role of electrically connecting the arrester valve sheet with other components. In practical applications, the arrester valve plate can be fixed between the first metal electrode 71 and the second metal electrode 72 .

The system further includes a dynamic characteristic measuring component 8 , and the dynamic characteristic measuring component 8 can be configured to send the surge current waveform and the overvoltage waveform to the upper computer 4 . The dynamic characteristic measurement component 8 includes a current sensor 81, a high-voltage probe 82 and a data collector 83, and the current sensor 81 and the high-voltage probe 82 are respectively electrically connected to the host computer 4 through the data collector 83; The current sensor 81 is sleeved on the current injection lead 6, and the high-voltage probe 82 is arranged inside the test box 1 and is in electrical contact with the arrester valve plate. The current sensor 81 can measure the inrush current injected into the lead wire 6, and the high-voltage probe 82 can measure the overvoltage on the arrester valve plate.

The host computer 4 is further configured to: acquire the impulse current waveform measured by the current sensor 81 to obtain the impulse current amplitude I _p and the wave front time Δt. The overvoltage waveform measured by the high-voltage probe 82 is acquired, and the overvoltage amplitude U _p is obtained. The dynamic characteristic evaluation factor k is calculated according to the surge current amplitude I _p , the wavefront time Δt and the overvoltage amplitude U _p .

Specifically, the calculation formula of the dynamic characteristic evaluation factor k is as follows:

k is the evaluation factor of the dynamic characteristics of the arrester valve plate, U _p is the amplitude of overvoltage on the arrester valve plate; I _p is the amplitude of the surge current, Δt is the wave front time of the surge current, and exp is the exponential function with the natural constant e as the base.

Among them, if k∈[0,0.2) means that the dynamic characteristics of the arrester valve plate are excellent, if k∈[0.2,0.5) means that the dynamic characteristics of the arrester valve plate are better, and if k∈[0.5,1) means that the dynamic characteristics of the arrester valve plate are Poor, if k∈[1,+∞), it means that the dynamic characteristics of the arrester valve are extremely poor. That is, the smaller the value of the calculated dynamic characteristic evaluation factor k, the better the dynamic characteristic of the arrester valve plate, the larger the value of the dynamic characteristic evaluation factor k, the worse the dynamic characteristic of the arrester valve plate.

In practical applications, for arresters of different types, materials, and structures, the characteristics of the arrester valve plates are not the same, and the calculated dynamic characteristics evaluation factor k is also different. Therefore, the dynamic characteristics can be evaluated according to actual needs. The factor k judgment interval is adjusted.

It can be seen from the above content that the arrester valve plate is placed in a standard air pressure environment, which excludes the influence of environmental factors, so that the overvoltage on the arrester valve plate under the action of the inrush current can better reflect the dynamic performance of the arrester valve plate, that is, the dynamic characteristic evaluation factor. k is more accurate, and the reflected dynamic performance of the arrester valve is more meaningful.

On the other hand, based on the above-mentioned system for evaluating the dynamic characteristics of the arrester valve plate under the action of the inrush current, the present application also provides a dynamic evaluation method for the arrester valve plate under the action of the inrush current. Referring to FIG. 4 , it is a schematic flowchart of a method for dynamic evaluation of a surge arrester valve plate under the action of an inrush current. As can be seen from FIG. 4 , the method includes:

S1: Measure the temperature and humidity inside the test box and send it to the host computer;

S2: respond to the host computer and adjust the temperature and humidity inside the test box;

S3: respond to the host computer and output the impulse current;

S4: Obtain the impulse current waveform measured by the current sensor, and obtain the impulse current amplitude and wave front time;

S5: Obtain the overvoltage waveform measured by the high-voltage probe, and obtain the overvoltage amplitude;

S6: Calculate a dynamic characteristic evaluation factor according to the inrush current amplitude, the wave front time, and the overvoltage amplitude.

It can be seen from the above technical solutions that the present application provides a system and method for evaluating the dynamic characteristics of a surge arrester valve plate under the action of an inrush current. The temperature and humidity measuring component 2 is configured to measure the temperature and humidity values inside the test box 1 and send them to the host computer 4 . The temperature and humidity adjustment component 3 is arranged inside the test box, and the temperature and humidity adjustment component 3 is configured to: respond to the upper computer 4 and adjust the temperature and humidity inside the test box 1 . The inrush current generating component 5 is configured to: respond to the upper computer 4 and output the inrush current. Metal electrode 7, the metal electrode 7 is arranged inside the test box 1, the metal electrode 7 is electrically connected with the surge current generating component 5 through the current injection lead 6, and the metal electrode 7 forms an electrical connection with the arrester valve sheet. touch. The dynamic characteristic measurement assembly 8 includes a current sensor 81, a high voltage probe 82 and a data collector 83. The current sensor 81 and the high voltage probe 82 pass through the data collector 83 and the upper Machine 4 is electrically connected. The current sensor 81 is sleeved on the current injection lead 6 . The high-voltage probe 82 is arranged inside the test box 1 and is in electrical contact with the arrester valve plate. The host computer 4 is further configured to: acquire the surge current waveform measured by the current sensor 81 to obtain the surge current amplitude and wave front time. The overvoltage waveform measured by the high-voltage probe 82 is acquired to obtain the overvoltage amplitude. A dynamic characteristic evaluation factor is calculated according to the surge current magnitude, the wave front time, and the overvoltage magnitude. The dynamic characteristic evaluation system of the arrester valve plate under the action of the surge current provided by this application, considering the impact of the surge current on the arrester valve plate, the obtained dynamic characteristic evaluation factor can reflect the dynamic characteristics of the arrester valve plate under the action of the surge current, and at the same time, The evaluation environment can be set to standard atmospheric conditions, and the influence of environmental factors on the dynamic characteristics of the arrester valve can be excluded. The dynamic characteristics of the arrester valve can be accurately evaluated to ensure the safety of the power system.

Similar parts between the embodiments provided in the present application may be referred to each other. The specific embodiments provided above are just a few examples under the general concept of the present application, and do not constitute a limitation on the protection scope of the present application. For those skilled in the art, any other implementations expanded according to the solution of the present application without creative work fall within the protection scope of the present application.

Claims (9)

1. A system for evaluating the dynamic characteristics of arrester valve plates under the action of an impulse current, is characterized in that, comprising: test box; a temperature and humidity measuring component arranged inside the test box, the temperature and humidity measuring component is configured to: measure the temperature and humidity value inside the test box and send it to the upper computer; a temperature and humidity adjustment component arranged inside the test box, the temperature and humidity adjustment component is configured to: respond to the upper computer and adjust the temperature and humidity inside the test box; an inrush current generating component, the inrush current generating component is configured to: respond to the upper computer and output the inrush current; a metal electrode, the metal electrode is arranged inside the test box, the metal electrode is electrically connected with the inrush current generating component through a current injection lead wire, and the metal electrode is in electrical contact with the arrester valve plate; a dynamic characteristic measurement component, the dynamic characteristic measurement component includes a current sensor, a high-voltage probe and a data collector, the current sensor and the high-voltage probe are respectively connected to the upper machine through the data collector; the current sensor sleeve set on the current injection lead; the high-voltage probe is set inside the test box and is in electrical contact with the arrester valve plate; The host computer is further configured to: acquire the impulse current waveform measured by the current sensor to obtain the impulse current amplitude and wave front time; acquire the overvoltage waveform measured by the high-voltage probe to obtain the overvoltage amplitude; Calculate the dynamic characteristic evaluation factor of the surge current amplitude, the wave front time and the overvoltage amplitude; The calculation formula of the dynamic characteristic evaluation factor is as follows:

k is the evaluation factor of the dynamic characteristics of the arrester valve plate, U _p is the amplitude of overvoltage on the arrester valve plate; I _p is the amplitude of the surge current, Δt is the wave front time of the surge current, and exp is the exponential function with the natural constant e as the base; Among them, if k∈[0,0.2) means that the dynamic characteristics of the arrester valve plate are excellent, if k∈[0.2,0.5) means that the dynamic characteristics of the arrester valve plate are better, and if k∈[0.5,1) means that the dynamic characteristics of the arrester valve plate are Poor, if k∈[1,+∞), it means that the dynamic characteristics of the arrester valve are extremely poor. 2 . The system for evaluating the dynamic characteristics of arrester valve plates under the action of inrush current according to claim 1 , wherein the temperature and humidity measurement components comprise a first temperature and humidity sensor, a second temperature and humidity sensor, a third temperature and humidity sensor, and a Temperature and humidity measurement mechanism, the first temperature and humidity sensor, the second temperature and humidity sensor and the third temperature and humidity sensor are respectively arranged on the inner wall of the test box, the first temperature and humidity sensor, the second temperature and humidity sensor The temperature and humidity sensor and the third temperature and humidity sensor are electromechanically connected to the upper position through the temperature and humidity measuring mechanism. 3 . The system for evaluating the dynamic characteristics of a surge arrester valve plate under the action of an inrush current according to claim 2 , wherein the temperature and humidity adjustment components comprise a temperature adjustment mechanism and a humidity adjustment mechanism, and the temperature adjustment mechanism and the humidity adjustment The mechanism is arranged inside the test box and is electromechanically connected with the upper position. 4 . The system for evaluating the dynamic characteristics of arrester valve plates under the action of inrush current according to claim 3 , wherein the host computer is further configured to: obtain the first temperature and humidity sensor and the second temperature and humidity sensor. 5 . and the temperature and humidity values sent by the third temperature and humidity sensor, calculate the temperature and humidity average values of the three temperature and humidity values, and if the temperature and humidity average values are equal to the preset value, generate a start command; the inrush current generating component is further configured to: respond The start command outputs an inrush current. 5 . The system for evaluating the dynamic characteristics of the arrester valve plate under the action of an inrush current according to claim 4 , wherein the host computer is further configured to: if the average temperature and humidity value is greater than a preset value, generate a lowering instruction; The humidity conditioning assembly is also configured to cool and dehumidify in response to the lowering command. 6 . The system for evaluating the dynamic characteristics of the arrester valve plate under the action of inrush current according to claim 5 , wherein the host computer is further configured to: if the average value of temperature and humidity is less than a preset value, generate a rising command; the The temperature and humidity adjustment assembly is further configured to: in response to the increase command, increase temperature and humidify. 7 . The system for evaluating the dynamic characteristics of a surge arrester valve plate under the action of an inrush current according to claim 1 , wherein the metal electrode comprises a first metal electrode and a second metal electrode, and the first metal electrode is connected to the current. 8 . Leads are injected, and the second metal electrode is grounded. 8 . The system for evaluating the dynamic characteristics of arrester valve plates under the action of inrush current according to claim 1 , wherein the inrush current generating component comprises an inrush current generator and an inrush current generation controller, and the inrush current generator has an inrush current generator. The output terminal is connected to the current injection lead, and the control terminal is electrically connected to the upper computer through the inrush current generation controller. 9. A method for evaluating the dynamic characteristics of an arrester valve plate under the action of an impulse current, which is applied to the system for evaluating the dynamic characteristics of an arrester valve plate under the action of an impulse current according to any one of claims 1-8, characterized in that, comprising: Measure the temperature and humidity inside the test box and send it to the host computer; Respond to the host computer and adjust the temperature and humidity inside the test box; Respond to the host computer and output impulse current; Obtain the impulse current waveform measured by the current sensor, and obtain the impulse current amplitude and wave front time; Obtain the overvoltage waveform measured by the high-voltage probe, and obtain the overvoltage amplitude; Calculate a dynamic characteristic evaluation factor according to the surge current amplitude, the wave front time and the overvoltage amplitude; The calculation formula of the dynamic characteristic evaluation factor is as follows:

k is the evaluation factor of the dynamic characteristics of the arrester valve plate, U _p is the amplitude of overvoltage on the arrester valve plate; I _p is the amplitude of the surge current, Δt is the wave front time of the surge current, and exp is the exponential function with the natural constant e as the base; Among them, if k∈[0,0.2) means that the dynamic characteristics of the arrester valve are excellent, if k∈[0.2,0.5) means that the dynamic characteristics of the arrester valve are better, and if k∈[0.5,1) means that the dynamic characteristics of the arrester valve are Poor, if k∈[1,+∞), it means that the dynamic characteristics of the arrester valve are extremely poor.

Images