Fault detection method and sampler for oil overflow of oil-filled high-pressure casing

Abstract

An oil flow overflow fault detection method for an oil-filled high-pressure casing, which performs unsaturated carbon-carbon bond detection by means of a chemical reaction, and determines whether an oil flow overflow fault occurs in the oil-filled high-pressure casing by means of the detection result of the unsaturated carbon-carbon bond. Specifically, a bromine carbon tetrachloride solution or a potassium permanganate aqueous ethanol solution is used as a detection reagent to detect a sample that is sampled from a surface of an oil-filled high-pressure casing to be tested, and it is determined whether the unsaturated carbon-carbon bond is detected according to whether a detection test paper is discolored, thereby determining whether an oil flow overflow fault has occurred in the oil-filled high-pressure casing to be tested. The present invention further relates to an oil flow overflow fault detection sampler for an oil-filled high-pressure casing, comprising a support rod (1), a sampling brush (3), and a fixing member (2) that is used for rotatably fixing the sampling brush and that is mounted at a top end of the support rod. The detection method and the sampler are simple and easy to operate, are resistant to environmental interference, and have the characteristics of accurate, sensitive and prompt detection.

Description

technical field [0001] The invention belongs to the technical field of operation state maintenance of power transmission and transformation equipment, and particularly relates to an oil-filled high-voltage casing oil overflow fault detection method and a sampler. Background technique [0002] The high-voltage bushing is an important accessory of the transformer. It is the necessary device for the exchange of electric energy between the inside and the outside of the transformer, and is the main channel of the transformer current. Common types of high-voltage bushings include dry-type and oil-filled types; among them, oil-filled high-voltage bushings are used in a relatively high proportion in the power grid. High-pressure casing oil belongs to hydrocarbons, the main components are cycloalkanes (about 80%), and the others are aromatic hydrocarbons and alkanes; the most abundant ones are cyclopentane, cyclohexane and their alkyl-substituted derivatives. High-pressure casing oi...

AI Technical Summary

Problems solved by technology

[0003] As the operation time of the equipment increases, the seal of the oil-filled high-pressure bushing is damaged due to the increase of internal pressure during operation, which may cause oil leakage; Poor contact due to lack of oxide layer treatment and conductive paste coating, excessive load or unreasonable distribution make the current exceed the safe current carrying capacity of the connecting conductor and pile head, and loosening of screws due to vibration or thermal expansion and contraction during the operation of the transformer. It may lead to oil overflow of high-voltage bushings, and oil overflow failure of oil-filled bushings will seriously affect the safe operation of the power grid

[0004] Usually, the oil overflow phenomenon occurs at the end of the casing, but because the phenomenon is not obvious, conventional detection methods such as infrared temperature measurement technology are based on the local abnormal temperature rise of the equipment caused by some faults, which have special color reflections on the infrared spectrum However, the reasons for the oil overflow of oil-filled high-pressure bushings are complicated, and the oil overflow does not necessarily cause abnormal temperature rise. This kind of fault basically has no reflection on the infrared spectrum, and it is difficult to detect it with the existing infrared temperature measurement technology.

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