Method for testing insulation performance of insulator and device thereof

Abstract

The invention discloses a method for testing insulation performance of insulator and a device thereof. The test method comprises the following steps: initializing zero value critical resistance R1 and low value critical resistance R2 of a tested insulator; exerting DC high voltage on the tested insulator under power-off state; collecting leakage current flowing through the tested insulator; calculating insulating resistance R by combining with volt-ampere method according to the exerted DC high voltage and collected leakage current obtained in the above steps; comparing the calculated insulating resistance R with zero value critical resistance R1 and low value critical resistance R2, then outputting the comparison result of the performance of the tested insulator. The test device comprises a high voltage power unit (1), a current collecting unit (2), and a processing unit (3). The invention has the advantages of broad application scope, applicability to on-site operation, intelligent measurement, rapid test, convenient operation, high measurement preciseness, abundant forms of output result, and good portability.

Description

technical field [0001] The invention relates to the field of electric power safety, in particular to a method and a device for detecting the insulation performance of an insulator. Background technique [0002] At present, most of the insulators used in my country's power grid are ceramic insulators. The new insulators have better insulation performance, but with the operation of transmission lines, the insulators will gradually age, the insulation resistance of the insulators will become smaller, and the insulation performance will decrease, becoming low-value insulators or Zero value insulators. The main causes of low-value insulators are: 1. The insulator is degraded. The insulator has been subjected to the electric field, the gravitational load of the line, and the action of nature, sunlight, rain, and snow for a long time. The insulation performance of insulators will be reduced; if the degree of low-value insulators becomes more serious or lightning breaks down the ins...

AI Technical Summary

Problems solved by technology

This method has two disadvantages: one is that it is time-consuming and labor-intensive to measure all the insulators one by one, and the efficiency is low; the other is that the sound of spark discharge is submerged by the corona sound during detection, and it is difficult to hear accurately from a long distance

Limited by the CMOS photosensitive sensitivity and long-distance detection of the UV imager, it is difficult to observe with the UV imager before the weak air ionization of the insulator develops into an arc

[0009] It can be seen that there are certain defects in the above methods. Moreover, in my country, only the electric power departments above the prefectural level have live workers, so in areas below the prefectural level where there are no live workers, it will not be possible to conveniently and effectively monitor the line. Insulators for live detection

At present, the power outage detection method mainly includes the shaker measurement method, but because it is very inconvenient to operate on the pole tower, and the risk factor of high-altitude operation is very high, it is often necessary to remove the insulator from the pole tower, which is very inconvenient to operate, time-consuming and laborious, resulting in power outages in the power grid The detection time is too long, which affects the use of the power grid

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