Zinc oxide arrester valve plate damage effect test method considering operation state

Abstract

The invention discloses a zinc oxide lightning arrester valve plate damage effect test method considering an operation state, and relates to the lightning arrester damage effect test field, and the method comprises the following steps: S1, selecting a plurality of lightning arrester valve plates of typical models of different manufacturers, and placing the valve plates in a comprehensive environment test box; s2, a current harmonic characteristic influence experiment is carried out, an application scheme of the lightning impulse current is adjusted, and the destructive effect of the lightning arrester valve plate on the lightning impulse current containing harmonic waves is researched; s3, a temperature characteristic influence experiment is carried out, the environment temperature of the lightning arrester valve plate is adjusted, and the destructive effect of the lightning arrester valve plate at different environment temperatures is researched; s4, a damp characteristic influence experiment is carried out, the environment humidity of the lightning arrester valve plate is adjusted, and the destructive effect of the lightning arrester valve plate under different environment humidity is studied; and S5, carrying out an aging characteristic influence experiment, adjusting the aging degree of the lightning arrester valve plate, and researching the destructive effect of the lightning arrester valve plates with different aging degrees.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of destructive effect test of lightning arrester, and in particular to a zinc oxide lightning arrester valve piece destructive effect test method considering operation state. BACKGROUND

[0002] As the first barrier of overvoltage protection in power systems, the performance stability of lightning arrester is directly related to the power supply reliability and equipment safety of the entire power grid. With the increase of system operation complexity caused by the increase of power grid voltage level and large-scale access of new energy, lightning arrester not only needs to withstand the transient impact of lightning overvoltage in actual operation, but also is long-term in a complex environment jointly acted by power frequency voltage, harmonic pollution, environmental temperature and humidity fluctuations and other factors. These operating stresses will cause the valve piece to gradually deteriorate, trigger its performance degradation, and significantly reduce its ability to withstand destructive impact. In-depth study of the influence of online operation state on valve piece damage and more realistic working condition destructive test research have great engineering value and theoretical significance for accurately evaluating the service life of lightning arrester and preventing power grid accidents caused by its failure.

[0003] The damage of lightning arrester is caused by short-time high-energy impact or continuous impact and performance degradation due to aging. So far, the type test and accelerated aging test specified in existing international and national standards are mostly based on single influence or simplified conditions, which are different from the complex action environment of multi-factor coupling and time sequence superposition faced by valve pieces in actual operation. Therefore, they cannot be used for destructive test evaluation under the joint action of multiple influence factors, especially in terms of simulating the additional thermal effect caused by harmonics, material degradation caused by environmental temperature and humidity, and the joint action of multiple factors. The present application proposes a zinc oxide lightning arrester valve piece destructive effect test method considering the influence factors of online operation state, which provides a basis for the destructive research of online lightning arrester. SUMMARY

[0004] The purpose of the present application is to provide a zinc oxide lightning arrester valve piece destructive effect test method considering operation state, so as to solve the problem in the prior art that the destructive test of lightning arrester valve piece is mostly based on single influence or simplified condition design, and cannot simulate the complex environment of multi-factor joint action such as harmonic pollution, environmental temperature and humidity fluctuation and aging in actual operation of lightning arrester, resulting in differences between the test results and the actual operation performance.

[0005] In order to achieve the above-mentioned purpose, the present application provides the following technical scheme: a zinc oxide lightning arrester valve piece destructive effect test method considering operation state, comprising the following steps:

[0006] S1, selecting multiple lightning arrester valve pieces of typical models from different manufacturers, and placing the valve pieces in a comprehensive environmental test box;

[0007] S2, current harmonic characteristic influence experiment, adjust the application scheme of lightning impulse current, study the destructive effect of lightning impulse current containing harmonics on the valve piece of lightning arrester;

[0008] S3, temperature characteristic influence experiment, adjust the environmental temperature of the valve piece of lightning arrester, study the destructive effect of the valve piece of lightning arrester under different environmental temperatures;

[0009] S4, moisture characteristic influence experiment, adjust the environmental humidity of the valve piece of lightning arrester, study the destructive effect of the valve piece of lightning arrester under different environmental humidities;

[0010] S5, aging characteristic influence experiment, adjust the aging degree of the valve piece of lightning arrester, study the destructive effect of the valve piece of lightning arrester under different aging degrees;

[0011] S6, parameter definition of the destructive effect of lightning arrester, obtain the change of the output parameters of the destructive effect of the valve piece with the current harmonics, the surface temperature of lightning arrester, the moisture degree of the valve piece of lightning arrester, and the aging degree of the valve piece of lightning arrester.

[0012] Further, the current harmonics are the harmonic components of the leakage current of the lightning arrester under different voltage application schemes, and the output includes the fundamental wave and at least one higher harmonic; the environmental temperature of the lightning arrester is realized by the temperature control system of the comprehensive environmental test chamber, and the temperature range is set to-40℃ to 100℃, including extreme temperature environmental scenarios; the moisture characteristic of the valve piece of lightning arrester is realized by the humidity control system of the comprehensive environmental test chamber, and the relative humidity range is set to 10% to 98%; the aging degree is realized by making the sample run for a preset time under the comprehensive environment of the current harmonics, temperature, and humidity.

[0013] Further, the parameters of the destructive effect of the valve piece of lightning arrester are as follows:

[0014] Appearance state parameter: observe whether the surface of the valve piece is damaged: whether the surface flashover occurs, whether the breakdown path is formed, etc., combined with microscopic analysis methods such as scanning electron microscopy (SEM) and X-ray diffraction (XRD), macro and micro combined to show the damage effect of the valve piece;

[0015] Electrical performance parameter: including leakage current IL and valve piece residual voltage value;

[0016] Characteristic parameter: draw the volt-ampere characteristic curve according to the current and voltage passing through the valve piece.

[0017] Further, record the number of repeated tests of each sample; according to the preset damage criterion, count and calculate the number of repeated impulse tests before the valve piece is damaged and the proportion of each type of failure, and compare the destructive effect performance of valve pieces of different manufacturers and typical models.

[0018] Compared with the prior art, the present invention provides a test method for the destructive effect of zinc oxide surge arrester valve plates that takes into account the operating state. It simulates the online operating state of the surge arrester through a comprehensive environmental test chamber and simulates the aging state close to the online operation of the surge arrester through the cumulative number of lightning strikes.

[0019] The test method comprehensively tested the destructive effects of different models of surge arrester varistors from various manufacturers and the changes in damage with harmonics, temperature, humidity, and aging.

[0020] The experimental method fills the gap in the study of the damage and destructive effects of surge arrester valve under simulated online operating conditions. The analysis of the destructive effects of surge arrester valve under online operating conditions obtained from the experiment has important reference value for revising the destructive effect model of surge arresters. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0022] Figure 1 A flowchart of the destructive test of surge arresters under the influence factors of online operating status provided in this embodiment of the invention;

[0023] Figure 2 This is a schematic diagram of the layout of the surge arrester valve plate impact test and measurement system provided in an embodiment of the present invention;

[0024] Figure 3 A graph showing the change in the number of lightning strikes a surge arrester withstands as a function of temperature, provided for an embodiment of the present invention. Detailed Implementation

[0025] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0026] As attached Figure 1 To be continued Figure 3 As shown:

[0027] Example 1:

[0028] This invention provides a test method for the destructive effect of zinc oxide surge arrester valve sections taking into account operating conditions. The test procedure for the destructive effect of surge arresters is as follows:

[0029] See the test procedure. Figure 1The simulated online operation experiment section utilizes an impulse voltage generator to generate lightning impulse current waveforms. A comprehensive environmental test chamber is used to set the operating environment for the surge arrester varistor, conducting destructive tests. The structure of the impulse voltage generator is adjusted to regulate different current harmonics, conducting harmonic influence characteristic tests. In the test chamber setup, the temperature and humidity of the comprehensive environmental test chamber are adjusted to test the influence of temperature characteristics; the operating time of the surge arrester within the test chamber is adjusted to test the destructive influence of aging characteristics. Each test condition is repeated at least five times. The surge arrester varistor model, comprehensive environmental test chamber parameters, and varistor damage type are recorded for each test. The leakage current and residual voltage of the varistor are also recorded for each test, and the volt-ampere characteristic curve is statistically analyzed. For each varistor model, continuous testing is conducted, and the number of impulse withstands and the proportion of various types of damage for different varistor models are statistically analyzed.

[0030] Specific instructions for destructive testing:

[0031] Figure 2 The middle section represents the impulse current generator, which uses impulse current generating equipment to generate a standard lightning impulse current waveform containing harmonics; the comprehensive environmental test chamber section uses a comprehensive environmental test chamber to adjust the ambient temperature range from -40℃ to 100℃ to consider extreme weather conditions and the ambient humidity range is set from 10% to 98%; the aging of the surge arrester valve is simulated by the number of impulses the surge arrester valve is subjected to before the formal test.

[0032] Detailed explanation of the output parameters of the destructive effect:

[0033] The damage was assessed by direct observation of surface damage, surface flashover, breakdown channels, and other damage, as well as by microscopic analysis using scanning electron microscopy and X-ray diffraction. This combined macroscopic and microscopic approach revealed the destructive effects on the valve plate. Figure 2 In the oscilloscope section, the current is measured via a Rogowski coil connected to the oscilloscope, and the voltage is measured via a high-voltage probe clamped to both ends of the valve plate and connected to the oscilloscope via a cable. In the DC high-voltage generator measurement module section, the leakage current and residual voltage are measured using the DC high-voltage generator arrester measurement module; the volt-ampere characteristic curve is plotted using the voltage and current data across the arrester valve plate at various times measured by the DC high-voltage generator.

[0034] Detailed explanation of statistics on destructive consequences:

[0035] Destructive tests that can be repeated are screened, and the average results of similar tests are statistically analyzed. The influence curves of various online state factors on the leakage current, residual voltage, volt-ampere curves, number of failures, and proportion of failure types of the surge arrester varistor are plotted. For example... Figure 3A bar graph showing the number of surge arrester varistor withstand cycles as a function of temperature, under standard lightning impulse current and impulse voltage generating equipment conditions of 23kV and 60% humidity.

[0036] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A method for testing the valve disc destruction effect of a zinc oxide surge arrester, taking into account the operating state, characterized in that, The method comprises the following steps: S1, selecting multiple arrester valve pieces of different typical models from different manufacturers and placing the valve pieces in a comprehensive environmental test box; S2, current harmonic characteristic influence experiment, adjusting the application scheme of lightning impulse current, and researching the destructive effect of the arrester valve piece on the lightning impulse current containing harmonics; S3, temperature characteristic influence experiment, adjusting the environmental temperature of the arrester valve piece, and researching the destructive effect of the arrester valve piece under different environmental temperatures; S4, moisture characteristic influence experiment, adjusting the environmental humidity of the arrester valve piece, and researching the destructive effect of the arrester valve piece under different environmental humidities; S5, aging characteristic influence experiment, adjusting the aging degree of the arrester valve piece, and researching the destructive effect of the arrester valve piece with different aging degrees; S6, parameter definition of the destructive effect of the arrester, and obtaining the change of the output parameters of the valve piece destructive effect with the current harmonics, the surface temperature of the arrester, the moisture degree of the arrester valve piece and the aging degree of the arrester valve piece.

2. The method according to claim 1, wherein the method is characterized by, The current harmonics are harmonic components of the arrester leakage current under different voltage application schemes, and the output contains a fundamental wave and at least one higher harmonic; the environmental temperature of the arrester is realized by a temperature control system of the comprehensive environmental test box, and the temperature range is set to-40℃ to 100℃, including extreme temperature environmental scenes; the moisture characteristic of the arrester valve piece is realized by a humidity control system of the comprehensive environmental test box, and the relative humidity range is set to 10% to 98%; the aging degree is realized by the continuous operation of the sample in the comprehensive environment of the current harmonics, temperature and humidity for a preset time length.

3. The method according to claim 1, wherein the method is characterized by, The parameters of the destructive effect of the arrester valve piece are as follows: Appearance state parameter: observing whether the valve piece surface is damaged: whether surface flashover occurs, whether a breakdown path is formed, etc., combining microscopic analysis methods such as scanning electron microscopy (SEM) and X-ray diffraction (XRD), macro-microscopic combination to show the damage effect of the valve piece; Electrical performance parameters: including leakage current IL and valve piece residual voltage value; Characteristic parameters: drawing the volt-ampere characteristic curve according to the current and voltage passing through the valve piece.

4. The method according to claim 1, wherein the method is characterized by, The number of repeated tests of each sample is recorded; according to the preset damage criterion, the number of repeated impulse tests before the valve piece is damaged and the proportion of each type of failure are counted and calculated, and the destructive effect performance of valve pieces of different typical models from different manufacturers is compared.

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