Causes analysis and treatment of end shield oil leak in 500kV main transformer bushing

Abstract

Abstract:

A 500kV main transformer of a power plant found oil leak defect at its bushing end shield of the high voltage side during overhaul. Through analysis, it was confirmed that the reason for oil leak was ungrounded end shield. It introduced the replacement of high voltage bushing and partial discharge test in details. After replacement, it was found that the end shied ground column was damaged during the dielectric dissipation test of transformer through disassembly check and the grounded copper sleeve was jammed and could not bounce fully. Countermeasure was carried out according to the causes of the defect.

Key words:

">">main transformer；bushing；end shield；oil leak；ground">

YU Wentao，HUANG Wenfeng，MA Xin.

Causes analysis and treatment of end shield oil leak in 500kV main transformer bushing

[J]. Huadian Technology, 2018, 40(2): 25-28.

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Causes analysis and treatment of end shield oil leak in 500kV main transformer bushing

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