CN112904116B - System and method for evaluating dynamic characteristics of valve plate of lightning arrester under action of impulse current - Google Patents
System and method for evaluating dynamic characteristics of valve plate of lightning arrester under action of impulse current Download PDFInfo
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- CN112904116B CN112904116B CN202110075176.3A CN202110075176A CN112904116B CN 112904116 B CN112904116 B CN 112904116B CN 202110075176 A CN202110075176 A CN 202110075176A CN 112904116 B CN112904116 B CN 112904116B
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Abstract
The application provides a dynamic characteristic evaluation system and method of a valve plate of an arrester under the action of impulse current, and the system comprises a test box and a temperature and humidity measurement assembly, wherein the temperature and humidity measurement assembly is configured to measure the temperature and humidity value in the test box and send the temperature and humidity value to an upper computer. And the temperature and humidity adjusting component is configured to respond to the upper computer and adjust the temperature and humidity inside the test box. And the impact current generating assembly is configured to respond to the upper computer and output impact current. And the metal electrode is electrically contacted with the lightning arrester valve plate. The upper computer is also configured to obtain an impact current waveform and an overvoltage waveform measured by the dynamic measurement component to obtain an impact current amplitude, a wavefront time and an overvoltage amplitude. And calculating a dynamic characteristic evaluation factor according to the impact current amplitude, the wave front time and the overvoltage amplitude. The application provides the influence of environmental factor to arrester valve block dynamic characteristic can be got rid of to the system. The dynamic characteristic of the valve plate of the lightning arrester can be accurately evaluated to ensure the safety of the power system.
Description
Technical Field
The application relates to the field of performance evaluation of lightning arresters, in particular to a dynamic characteristic evaluation system and method for a valve plate of a lightning arrester under the action of impact current.
Background
Natural phenomena such as lightning and the like can generate overvoltage, and the overvoltage can damage power equipment in a power system, so that the 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, namely the arrester valve plate, are susceptible to deterioration caused by the influence of environmental factors, so that the dynamic performance is weakened, and therefore, the dynamic characteristics of the arrester valve plate need to be evaluated.
The general dynamic characteristic evaluation method is to detect the total current or leakage current of the arrester during normal operation to obtain an evaluation factor, and to judge the dynamic performance of the valve plate of the arrester by using the evaluation factor.
The evaluation method can only reflect the performance of the valve plate of the lightning arrester when bearing power frequency voltage, cannot reflect the dynamic characteristic of the valve plate of the lightning arrester under the action of impact current, cannot eliminate the influence of environmental factors such as temperature and humidity on the dynamic performance of the valve plate of the lightning arrester, and cannot obtain an inaccurate dynamic performance conclusion.
Disclosure of Invention
The application provides a dynamic characteristic evaluation system and method of a valve plate of an arrester under the action of an impact current, and aims to solve the problem that the dynamic performance conclusion of a traditional evaluation method is inaccurate.
On the one hand, this application provides an arrester valve block dynamic characteristic evaluation system under impulse current effect, includes:
a test chamber;
a temperature and humidity measurement component disposed inside the test chamber, the temperature and humidity measurement component configured to: measuring the temperature and humidity value in the test box and sending the temperature and humidity value to an upper computer;
the temperature and humidity adjusting assembly is arranged inside the test box and is configured to: responding to the upper computer and adjusting the temperature and the humidity in the test box;
a rush current generating component configured to: responding to the upper computer and outputting impact current;
the metal electrode is arranged in the test box, the metal electrode is electrically connected with the impact current generation assembly through a current injection lead, and the metal electrode is in electric contact with a lightning arrester valve plate;
the dynamic characteristic measuring component comprises a current sensor, a high-voltage probe and a data collector, and the current sensor and the high-voltage probe are electrically connected with the upper computer through the data collector respectively; the current sensor is sleeved on the current injection lead; the high-voltage probe is arranged in the test box and is in electric contact with the lightning arrester valve plate;
the upper computer is further configured to: obtaining an impact current waveform measured by the current sensor to obtain an impact current amplitude and wavefront time; acquiring an overvoltage waveform measured by the high-voltage probe to obtain an overvoltage amplitude; and calculating a dynamic characteristic evaluation factor according to the impact current amplitude, the wave front time and the overvoltage amplitude.
Optionally, the calculation formula of the dynamic characteristic evaluation factor is as follows:
k is dynamic characteristic evaluation factor of lightning arrester valve plate, U p The amplitude of overvoltage on the valve plate of the lightning arrester is shown; i is p The amplitude of the impact current is, delta t is the wave front time of the impact current, exp is an exponential function with a natural constant e as a base;
wherein, if k belongs to [0,0.2) represents that the dynamic characteristic of the arrester valve plate is excellent, if k belongs to [0.2,0.5) represents that the dynamic characteristic of the arrester valve plate is better, if k belongs to [0.5,1) represents that the dynamic characteristic of the arrester valve plate is poorer, and if k belongs to [1, + ∞) represents that the dynamic characteristic of the arrester valve plate is extremely poor.
Optionally, the temperature and humidity measuring assembly comprises a first temperature and humidity sensor, a second temperature and humidity sensor, a third temperature and humidity sensor and a temperature and humidity measuring 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, and the first temperature and humidity sensor, the second temperature and humidity sensor and the third temperature and humidity sensor are electrically connected with the upper computer through the temperature and humidity measuring mechanism.
Optionally, the temperature and humidity adjusting assembly comprises a temperature adjusting mechanism and a humidity adjusting mechanism, and the temperature adjusting mechanism and the humidity adjusting mechanism are arranged inside the test box and electrically connected with the upper computer.
Optionally, the upper computer is further configured to: acquiring 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, calculating a temperature and humidity mean value of the three temperature and humidity values, and generating a starting instruction if the temperature and humidity mean value is equal to a preset value; the rush current generating assembly is further configured to: and responding to the starting instruction and outputting impact current.
Optionally, the upper computer is further configured to: if the temperature and humidity mean value is larger than a preset value, generating a reduction instruction; the temperature and humidity adjustment assembly is further configured to: and responding to the lowering command, and cooling and dehumidifying.
Optionally, the upper computer is further configured to: if the temperature and humidity mean value is smaller than a preset value, generating a rising instruction; the temperature and humidity adjustment assembly is further configured to: and responding to the rising instruction, and heating and humidifying.
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 impulse current generation assembly comprises an impulse current generator and an impulse current generation controller, the output end of the impulse current generator is connected with the current injection lead, and the control end of the impulse current generation controller is electrically connected with the upper computer.
On the other hand, the application provides an arrester valve block dynamic characteristic evaluation method under the action of impulse current, include:
measuring the temperature and humidity value in the test box and sending the temperature and humidity value to an upper computer;
responding to the upper computer and adjusting the temperature and the humidity in the test box;
responding to the upper computer and outputting impact current;
obtaining an impact current waveform measured by a current sensor to obtain an impact current amplitude and wavefront time;
acquiring an overvoltage waveform measured by a high-voltage probe to obtain an overvoltage amplitude;
and calculating a dynamic characteristic evaluation factor according to the impact current amplitude, the wave front time and the overvoltage amplitude.
According to the technical scheme, the dynamic characteristic evaluation system and method for the valve plate of the lightning arrester under the action of the impact current comprise a test box and a temperature and humidity measuring assembly, wherein the temperature and humidity measuring assembly is configured to measure the temperature and humidity value inside the test box and send the temperature and humidity value to an upper computer. And the temperature and humidity adjusting component is configured to respond to the upper computer and adjust the temperature and humidity inside the test box. And the impulse current generating assembly is configured to respond to the upper computer and output impulse current. And the metal electrode is electrically contacted with the lightning arrester valve plate. The upper computer is also configured to obtain an impact current waveform and an overvoltage waveform measured by the dynamic measurement component to obtain an impact current amplitude, a wavefront time and an overvoltage amplitude. And calculating a dynamic characteristic evaluation factor according to the impact current amplitude, the wave front time and the overvoltage amplitude. The application provides the influence of environmental factor to arrester valve block dynamic characteristic can be got rid of to the system. The dynamic characteristic of the valve plate of the lightning arrester can be accurately evaluated to ensure the safety of the power system.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a dynamic characteristic evaluation system of a valve plate of an arrester under the action of an impulse current according to the present application;
fig. 2 is a schematic structural diagram of another system for evaluating dynamic characteristics of a valve plate of an arrester under the action of an impulse current according to the present application;
FIG. 3 is a schematic diagram of a computer configuration according to an embodiment of the present application;
fig. 4 is a schematic flow chart of a dynamic evaluation method of a valve plate of an arrester under the action of an impulse current.
Detailed Description
Reference will now be made in detail to embodiments, examples of which are illustrated in the accompanying drawings. The following description refers to the accompanying drawings in which the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following examples do not represent all embodiments consistent with the present application. But merely as exemplifications of systems and methods consistent with certain aspects of the application, as recited in the claims.
Referring to fig. 1, a schematic structural diagram of a dynamic characteristic evaluation system of a valve plate of an arrester under the action of an impulse current is provided. Referring to fig. 2, a schematic structural diagram of a system for evaluating dynamic characteristics of a valve plate of an arrester under an action of an impulse current is shown. As can be seen from fig. 1 and 2, the system includes: the test box comprises a test box 1, wherein the test box 1 can be a cube made of acrylic materials and having the size of 1m x 0.8m x 0.6m, through holes can be formed in two opposite surfaces of the test box 1, the lightning arrester valve plate is arranged in the test box 1, and the through holes can enable the lightning arrester valve plate to be electrically connected with other components. The test box 1 can provide an arrester valve plate dynamic characteristic evaluation environment.
The resistance value of arrester valve block easily receives the influence of humiture, and the humiture is big more, and its resistance value is lower, consequently, can set up the environment of proof box 1 inside as standard atmosphere reference condition. The system further comprises a temperature and humidity measurement component 2 disposed inside the test chamber, the temperature and humidity measurement component 2 being configured to: and measuring the temperature and humidity value in the test box 1 and sending the temperature and humidity value to the upper computer 4. The system further comprises a temperature and humidity adjusting component 3 arranged inside the test chamber, wherein the temperature and humidity adjusting component 3 is configured to: and responding to the upper computer 4 and adjusting the temperature and the humidity in the test box 1. The upper computer 4 can send an adjusting instruction to the test box 1. The temperature and humidity measuring component 2 can play a role in measuring the temperature and humidity in the test box 1, and the temperature and humidity adjusting component 3 can play a role in adjusting the temperature and humidity in the test box 1 to a standard atmospheric reference condition.
Further, the temperature and humidity measurement 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 measurement mechanism 24, the first temperature and humidity sensor 21, the second temperature and humidity sensor 22 and the third temperature and humidity sensor 23 are respectively arranged on the inner wall of the test box 1, and the first temperature and humidity sensor 21, the second temperature and humidity sensor 22 and the third temperature and humidity sensor 23 are electrically connected with the upper computer 4 through the temperature and humidity measurement mechanism 24. First temperature and humidity sensor 21, second temperature and humidity sensor 22 and third temperature and humidity sensor 23 can set up respectively right flank, left surface and the leading flank positive center of proof box 1, and concrete setting mode can be designed according to actual conditions, and this application does not do specifically and restricts. The temperature and humidity of different positions in the test box 1 can be fully measured by the three temperature and humidity sensors, so that the temperature and humidity measurement values have more reference significance.
Further, the temperature and humidity adjusting component 3 comprises a temperature adjusting mechanism 31 and a humidity adjusting mechanism 32, wherein the temperature adjusting mechanism 31 and the humidity adjusting mechanism 32 are arranged inside the test box 1 and electrically connected with the upper computer 4. The temperature adjusting mechanism 31 may increase or decrease the temperature in the test chamber 1, and the humidity adjusting mechanism 32 may increase or decrease the humidity in the test chamber 1.
In practical application, the upper computer 4 can judge whether the environment in the test chamber 1 is equivalent to the standard atmospheric environment according to the temperature and humidity value sent by the temperature and humidity measuring mechanism 24, and if not, the upper computer 4 can control the temperature adjusting mechanism 31 and the humidity adjusting mechanism 32 through an instruction, so that the environment in the test chamber 1 is equivalent to the standard atmospheric environment.
The system further comprises a rush current generating assembly 5, the rush current generating assembly 5 being configured to: and responding to the upper computer 4 and outputting impact current. The upper computer 4 can send a starting instruction to the impact current generation assembly 5. In practical application, the surge current generating assembly 5 can output a surge current for evaluating the dynamic characteristic of the lightning arrester valve plate.
The impulse current generation assembly 5 comprises an impulse current generator 51 and an impulse current generation controller 52, the output end of the impulse current generator 51 is connected with the current injection lead 6, and the control end of the impulse current generation controller 52 is electrically connected with the upper computer.
Further, refer to fig. 3, which is a schematic diagram of a host computer configuration according to an embodiment of the present application. The upper computer 4 is further configured to: acquiring 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, calculating a temperature and humidity mean value of the three temperature and humidity values, and generating a starting instruction if the temperature and humidity mean value is equal to a preset value; the inrush current generating component 5 is further configured to: and responding to the starting command and outputting impact current. Wherein, the start instruction includes a current peak value I and a peak time t of the inrush current that the inrush current generator 51 needs to output 1 . In practical applications, the inrush current generation controller 52 is capable of responding to the start command and obtaining a current peak value I and a peak value time t included in the start command 1 And sent to the rush current generator 51, and the rush current generator 51 outputs a corresponding rush current.
The upper computer 4 may be further configured to: if the temperature and humidity mean value is larger than a preset value, generating a reduction instruction; the temperature and humidity adjusting assembly 3 is further configured to: and responding to the lowering command, and cooling and dehumidifying. The upper computer 4 may be further configured to: if the temperature and humidity mean value is smaller than a preset value, generating a rising instruction; the temperature and humidity adjusting assembly 3 is further configured to: and responding to the rising instruction, and heating and humidifying. The preset value is the temperature t under the standard reference atmospheric condition 0 At 20 ℃ and absolute humidity h 0＝ 11g/m 3 . After the environment in the test box 1 is adjusted to a preset value through the temperature and humidity adjusting component 3, the dynamic performance of the valve plate of the lightning arrester can be evaluated. The lowering command and the raising command may include a difference amount to be lowered or raised, and the temperature adjusting mechanism 31 and the humidity adjusting mechanism 32 may adjust the temperature of the test chamber 1 based on the difference amountThe temperature and humidity of the air are regulated. This adjustment process is stopped until the temperature and humidity mean value is equal to the preset value.
The system further comprises a metal electrode 7, the metal electrode 7 is arranged inside the test box 1, the metal electrode 7 is electrically connected with the impact current generating assembly 5 through a current injection lead 6, and the metal electrode 7 is in electric contact with the lightning arrester valve plate. 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 lightning arrester valve plate under certain pressure, and the lightning arrester valve plate can be electrically connected with other parts. In practical application, the lightning arrester valve plate is fixed between the first metal electrode 71 and the second metal electrode 72.
The system further includes a dynamic characteristic measurement component 8, the dynamic characteristic measurement component 8 may be configured to send a surge current waveform and an overvoltage waveform to the upper computer 4. The dynamic characteristic measuring component 8 comprises a current sensor 81, a high-voltage probe 82 and a data collector 83, wherein the current sensor 81 and the high-voltage probe 82 are respectively and electrically connected with the upper 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 lightning arrester valve plate. The current sensor 81 can measure the impact current on the current injection lead 6, and the high voltage probe 82 can measure the overvoltage on the lightning arrester valve sheet.
The upper computer 4 is further configured to: obtaining the impulse current waveform measured by the current sensor 81 to obtain the impulse current amplitude I p And wavefront time Δ t. Obtaining the overvoltage waveform measured by the high-voltage probe 82 to obtain an overvoltage amplitude U p . According to the impact current amplitude I p The wavefront time Δ t and the overvoltage amplitude U p A dynamic characteristic evaluation factor k is calculated.
Specifically, the calculation formula of the dynamic characteristic evaluation factor k is as follows:
k is dynamic characteristic evaluation factor of lightning arrester valve plate, U p The amplitude of the overvoltage on the valve plate of the lightning arrester; i is p For the impulse current amplitude, Δ t is the wavefront time of the impulse current, exp is an exponential function with a natural constant e as the base.
Wherein, if k belongs to [0,0.2) represents that the dynamic characteristic of the arrester valve plate is excellent, if k belongs to [0.2,0.5) represents that the dynamic characteristic of the arrester valve plate is better, if k belongs to [0.5,1) represents that the dynamic characteristic of the arrester valve plate is poorer, and if k belongs to [1, + ∞) represents that the dynamic characteristic of the arrester valve plate is extremely poor. That is, the smaller the value of the calculated dynamic characteristic evaluation factor k is, the better the dynamic characteristic of the lightning arrester valve plate is represented, and the larger the value of the dynamic characteristic evaluation factor k is, the worse the dynamic characteristic of the lightning arrester valve plate is represented.
In practical application, for arresters of different models, different materials and different structures, the characteristics of the arrester valve plates are different, and the calculated dynamic characteristic evaluation factors k are different, so that the judgment interval of the dynamic characteristic evaluation factors k can be adjusted according to actual needs.
According to the above, the valve plate of the arrester is arranged in the standard air pressure environment, the influence of environmental factors is eliminated, the overvoltage on the valve plate of the arrester can reflect the dynamic performance of the valve plate of the arrester under the action of the impact current, namely, the dynamic characteristic assessment factor k is more accurate, and the reflected dynamic performance of the valve plate of the arrester has more reference significance.
On the other hand, based on above-mentioned lightning arrester valve block dynamic characteristic evaluation system under the impulse current effect, this application still provides a lightning arrester valve block dynamic evaluation method under the impulse current effect. Referring to fig. 4, a schematic flow chart of a dynamic evaluation method of a valve plate of an arrester under the action of an impulse current according to the present application is shown, and as can be seen from fig. 4, the method includes:
s1: measuring the temperature and humidity value in the test box and sending the temperature and humidity value to an upper computer;
s2: responding to the upper computer and adjusting the temperature and the humidity in the test box;
s3: responding to the upper computer and outputting impact current;
s4: obtaining an impact current waveform measured by a current sensor to obtain an impact current amplitude and wavefront time;
s5: acquiring an overvoltage waveform measured by a high-voltage probe to obtain an overvoltage amplitude;
s6: and calculating a dynamic characteristic evaluation factor according to the impact current amplitude, the wave front time and the overvoltage amplitude.
According to the technical scheme, the application provides a system and a method for evaluating dynamic characteristics of a valve plate of an arrester under the action of impact current, and the system comprises: the temperature and humidity measuring device comprises a test box 1 and a temperature and humidity measuring component 2 arranged inside the test box 1, wherein the temperature and humidity measuring component 2 is configured to: and measuring the temperature and humidity value in the test box 1 and sending the temperature and humidity value to the upper computer 4. A temperature and humidity adjustment assembly 3 disposed inside the test chamber, the temperature and humidity adjustment assembly 3 configured to: responding to the upper computer 4 and adjusting the temperature and the humidity inside the test box 1. A rush current generating assembly 5 configured to: and responding to the upper computer 4 and outputting impact current. The metal electrode 7 is arranged inside the test box 1, the metal electrode 7 is electrically connected with the impact current generation assembly 5 through a current injection lead 6, and the metal electrode 7 is in electric contact with a lightning arrester valve plate. The dynamic characteristic measuring component 8 comprises a current sensor 81, a high-voltage probe 82 and a data collector 83, wherein the current sensor 81 and the high-voltage probe 82 are respectively connected with the upper computer 4 through the data collector 83. 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 lightning arrester valve plate. The upper computer 4 is further configured to: and obtaining the impulse current waveform measured by the current sensor 81 to obtain the impulse current amplitude and the wavefront time. And acquiring the overvoltage waveform measured by the high-voltage probe 82 to obtain an overvoltage amplitude. And calculating a dynamic characteristic evaluation factor according to the impact current amplitude, the wave front time and the overvoltage amplitude. The application provides an arrester valve block dynamic characteristic evaluation system under impact current effect, considers the impact current to the influence of arrester valve block, and the dynamic characteristic evaluation factor that obtains can reflect the dynamic characteristic of arrester valve block under the impact current effect, simultaneously, can set up the evaluation environment into standard atmospheric condition, gets rid of the influence of environmental factor to arrester valve block dynamic characteristic. The dynamic characteristic of the valve plate of the lightning arrester can be accurately evaluated to ensure the safety of the power system.
The embodiments provided in the present application are only a few examples of the general concept of the present application, and do not limit the scope of the present application. Any other embodiments that can be extended by the solution according to the present application without inventive efforts will be within the scope of protection of the present application for a person skilled in the art.
Claims (9)
1. The utility model provides an arrester valve block dynamic characteristic evaluation system under impulse current effect which characterized in that includes:
a test chamber;
a temperature and humidity measurement component disposed inside the test chamber, the temperature and humidity measurement component configured to: measuring the temperature and humidity value in the test box and sending the temperature and humidity value to an upper computer;
the temperature and humidity adjusting assembly is arranged inside the test box and is configured to: responding to the upper computer and adjusting the temperature and the humidity in the test box;
a rush current generating component configured to: responding to the upper computer and outputting impact current;
the metal electrode is arranged in the test box, the metal electrode is electrically connected with the impact current generation assembly through a current injection lead, and the metal electrode is in electric contact with a lightning arrester valve plate;
the dynamic characteristic measuring component comprises a current sensor, a high-voltage probe and a data collector, and the current sensor and the high-voltage probe are electrically connected with the upper computer through the data collector respectively; the current sensor is sleeved on the current injection lead; the high-voltage probe is arranged in the test box and is in electric contact with the lightning arrester valve plate;
the host computer is further configured to: obtaining an impact current waveform measured by the current sensor to obtain an impact current amplitude and wavefront time; acquiring an overvoltage waveform measured by the high-voltage probe to obtain an overvoltage amplitude; calculating a dynamic characteristic evaluation factor according to the impact current amplitude, the wave front time and the overvoltage amplitude;
the calculation formula of the dynamic characteristic evaluation factor is as follows:
k is dynamic characteristic evaluation factor of lightning arrester valve plate, U p The amplitude of overvoltage on the valve plate of the lightning arrester is shown; i is p The amplitude of the impact current is, delta t is the wave front time of the impact current, exp is an exponential function with a natural constant e as a base;
wherein, if k belongs to [0,0.2) represents that the dynamic characteristic of the arrester valve plate is excellent, if k belongs to [0.2,0.5) represents that the dynamic characteristic of the arrester valve plate is better, if k belongs to [0.5,1) represents that the dynamic characteristic of the arrester valve plate is poorer, and if k belongs to [1, + ∞) represents that the dynamic characteristic of the arrester valve plate is extremely poor.
2. The dynamic characteristic evaluation system for the valve plate of the lightning arrester under the action of the inrush current according to claim 1, wherein the temperature and humidity measurement assembly comprises 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, and the first temperature and humidity sensor, the second temperature and humidity sensor and the third temperature and humidity sensor are electrically connected with the upper computer through the temperature and humidity measurement mechanism.
3. The dynamic characteristic evaluation system of the valve plate of the arrester under the action of the impact current according to claim 2, wherein the temperature and humidity adjusting assembly comprises a temperature adjusting mechanism and a humidity adjusting mechanism, and the temperature adjusting mechanism and the humidity adjusting mechanism are arranged inside the test box and are electrically connected with the upper computer.
4. The system for evaluating dynamic characteristics of a valve plate of an arrester under the action of a surge current according to claim 3, wherein the upper computer is further configured to: acquiring 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, calculating a temperature and humidity mean value of the three temperature and humidity values, and generating a starting instruction if the temperature and humidity mean value is equal to a preset value; the inrush current generating component is further configured to: and responding to the starting instruction and outputting impact current.
5. The system for evaluating dynamic characteristics of a valve plate of an arrester under the action of a surge current according to claim 4, wherein the upper computer is further configured to: if the temperature and humidity mean value is larger than a preset value, generating a reduction instruction; the temperature and humidity adjustment assembly is further configured to: and responding to the lowering command, and cooling and dehumidifying.
6. The system for evaluating dynamic characteristics of a valve plate of an arrester under the action of a surge current according to claim 5, wherein the upper computer is further configured to: if the temperature and humidity mean value is smaller than a preset value, generating a rising instruction; the temperature and humidity adjustment assembly is further configured to: and responding to the rising instruction, and heating and humidifying.
7. The system for evaluating the dynamic characteristics of an arrester valve sheet under the action of a surge current of claim 1, wherein the metal electrodes comprise a first metal electrode and a second metal electrode, the first metal electrode is connected with the current injection lead, and the second metal electrode is grounded.
8. The system for evaluating the dynamic characteristics of the valve plate of the arrester under the action of the impact current according to claim 1, wherein the impact current generation assembly comprises an impact current generator and an impact current generation controller, the output end of the impact current generator is connected with the current injection lead, and the control end of the impact current generator is electrically connected with the upper computer through the impact current generation controller.
9. A dynamic characteristic evaluation method of an arrester valve plate under the action of impact current is applied to the dynamic characteristic evaluation system of the arrester valve plate under the action of impact current, which is characterized by comprising the following steps:
measuring the temperature and humidity value in the test box and sending the temperature and humidity value to an upper computer;
responding to the upper computer and adjusting the temperature and the humidity in the test box;
responding to the upper computer and outputting impact current;
obtaining an impact current waveform measured by a current sensor to obtain an impact current amplitude and wavefront time;
acquiring an overvoltage waveform measured by a high-voltage probe to obtain an overvoltage amplitude;
calculating a dynamic characteristic evaluation factor according to the impact current amplitude, the wave front time and the overvoltage amplitude;
the calculation formula of the dynamic characteristic evaluation factor is as follows:
k is dynamic characteristic evaluation factor of lightning arrester valve plate, U p The amplitude of the overvoltage on the valve plate of the lightning arrester; i is p The amplitude of the impact current is, delta t is the wave front time of the impact current, exp is an exponential function with a natural constant e as a base;
wherein, if k belongs to [0,0.2) represents that the dynamic characteristic of the arrester valve plate is excellent, if k belongs to [0.2,0.5) represents that the dynamic characteristic of the arrester valve plate is better, if k belongs to [0.5,1) represents that the dynamic characteristic of the arrester valve plate is poorer, and if k belongs to [1, + ∞) represents that the dynamic characteristic of the arrester valve plate is extremely poor.
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| CN113589063B (en) * | 2021-06-21 | 2024-01-30 | 昆明理工大学 | Lightning arrester valve plate pressure-sensitive characteristic evaluation system and method under multiple lightning strike actions |
| CN114167165B (en) * | 2021-11-12 | 2022-08-23 | 西南交通大学 | Lightning arrester valve plate service state evaluation method considering power pickup under multiple pulses |
| CN114137288B (en) * | 2021-11-15 | 2022-09-20 | 西南交通大学 | Lightning arrester performance evaluation method under single lightning stroke considering energy extraction |
| CN115327271B (en) * | 2022-08-11 | 2024-07-23 | 云南电网有限责任公司电力科学研究院 | Zinc oxide valve plate degradation degree evaluation method considering humid environment |
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