Lightening arrester aging life evaluation method combining electrical test with microanalysis

Abstract

The invention discloses a lightning arrester aging life evaluation method combining an electrical test with microanalysis. The method comprises the following steps of A, selecting a plurality of to-be-tested resistance sheets for evaluation and separately testing chemical components and phase structures of the to-be-tested resistance sheets; B, on the basis of a test result in step A, matching a corresponding aging characteristic curve in a pre-constructed aging characteristic database as a first aging characteristic curve; C, selecting a plurality of to-be-tested resistance sheets in a laterrunning stage and carrying out an accelerated aging test to obtain an aging characteristic curve corresponding to the to-be-tested resistance sheets as a second aging characteristic curve; D, using the second aging characteristic curve for correcting the first aging characteristic curve to obtain a third aging characteristic curve; E, testing the electrical parameters of the to-be-tested resistance sheets and calculating the aging life of the to-be-tested resistance sheets according to the actual running load of the to-be-tested resistance sheets on the basis of the third aging characteristiccurve. According to the method, the aging degree of the resistance sheets in different states can be accurately evaluated in a simple mode, and the calculation amount for evaluation is small.

Description

technical field [0001] The invention relates to the field of detection of power system accessories, in particular to a method for evaluating the aging life of an arrester combining electrical testing and microscopic analysis. Background technique [0002] The performance of zinc oxide (ZnO) arrester resistors will gradually decrease with the passage of time. Effectively evaluating the aging life of resistors plays a vital role in the maintenance of arresters and the safety of power systems. [0003] At present, there are some detection methods for the aging degree of zinc oxide arrester resistors that have been in operation for many years. For example, CN103884918A discloses a detection method for the aging degree of zinc oxide arrester resistors. However, the scheme adopted is more complicated and the process is more cumbersome , and has high requirements for the test environment and lacks reference. At present, there is no simple and mature aging state analysis method, a...

AI Technical Summary

Problems solved by technology

[0005] However, most of the existing technologies analyze the aging state of the arrester resistor after long-term operation through the change of electrical macroscopic characteristics. Due to the lack of accelerated aging test data of the resistor used in the original arrester, it is impossible to grasp its aging test characteristics and cannot take into account The essential electrical performance difference caused by the performance difference of the resistive sheet itself with different composition and phase structure

Through the traditional single electrical test data change trend, only the linear change curve can be used to roughly infer the remaining life of the standard limit

There is a large deviation in this rough inference or estimation, especially the aging life of the resistor does not change linearly

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