Judgment method for partial discharge development stage of oil-paper insulation

Abstract

The invention discloses a judgment method for a partial discharge development stage of oil paper insulation. A device capable of simultaneously testing partial discharge of oil paper insulation and amoisture content in oil is designed; an adopted test electrode is a column plate electrode; a pressurizing device is used for pressurizing the oil paper insulation; the partial discharge development process of oil paper insulation and the moisture content in oil are monitored through a partial discharge tester and an in-oil moisture tester respectively. The measured data are transmitted to a computer, and the oil paper insulation partial discharge development stage is determined according to the characteristic parameters measured by a PRPD spectrogram in the taken time period after the partialdischarge development stage is divided. The device involved in the method considers the influence of moisture in the insulating oil on the partial discharge development process, so that the method can more accurately judge the partial discharge development stage of the oil paper insulation, and the existence of serious defects of the oil paper insulation can be predicted in advance.

Description

technical field [0001] The invention belongs to the field of insulation tests of oil-paper insulation, and in particular relates to a method for judging the development stage of partial discharge of oil-paper insulation. Background technique [0002] According to the survey data, the power system accidents caused by electrical equipment in my country account for about 50% every year, and power transformers are one of the core electrical equipment in the power transmission and distribution network, so the safety and reliability of their operation are directly related to the power system. System security and stability. During the operation of power transformers, some weak links in the oil-paper insulation structure will generate discharge due to continuous exposure to local excessive field strength, and the insulation damage caused by partial discharge will continue to develop, which will eventually lead to insulation accidents. [0003] Creepage discharge is one of the common...

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Problems solved by technology

The power frequency partial discharge test can obtain a large amount of insulation partial discharge information at different voltage levels, but most of the current analysis and research on partial discharge tests are still at the qualitative analysis level or biased towards fault identification. For the division of partial discharge development stages Therefore, there is an urgent need for a method for judging the development stage of partial discharge in oil-paper insulation. By matching the test sample points with the divided clusters, it is possible to judge the development stage of partial discharge in oil-paper insulation under the test voltage. Helps predict the existence of serious defects in advance

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