Analysis on reasons of high voltage bushing end shield fault of 220kV transformer and treatment

Huadian Technology ›› 2011, Vol. 33 ›› Issue (7): 45-47.

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Analysis on reasons of high voltage bushing end shield fault of 220kV transformer and treatment

TANG Jiahong

Guangdong Huizhou Natural Gas Power Generation Company Limited, Huizhou 516082, China

Received:1900-01-01 Revised:1900-01-01 Online:2011-07-25 Published:2011-07-25

Abstract

Abstract: There were serious electric discharge vestiges existing in high voltage side phase B bushing end shield of the 220kV transformer in a power plant. The acetylene exceeding the standard was inspected out in the insulating oil in the bushing. Based on analysis, it was judged that the fault reason is the defects of the bushing onhline detecting device in its design and installation, which cause the end shield grounding wire to be broken in operation, the end shield was in suspension, its electric potential was raised and the electric discharge was occurred. A new site bushing replacing method was put forward, in which the discharge of the transformer oil is not needed. By using this method, a mass of manpower and material resource was saved, and the repair time duration was shortened.

Key words: transformer, high voltage bushing, end shield, fault

TANG Jiahong. Analysis on reasons of high voltage bushing end shield fault of 220kV transformer and treatment[J]. Huadian Technology, 2011, 33(7): 45-47.

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Analysis on reasons of high voltage bushing end shield fault of 220kV transformer and treatment

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