Analysis of relay protection action of grounding fault of no-load charging of a 330 kV transformer

In view of problem that a 330 kV start-up standby transformer took place relay protection action in no-load charging, the paper indicated that the action was caused by grounding fault of A-phase current transformer through analyzing charging current waveform recorded by electric quantity analyzer, a...

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Bibliographic Details
Published inGong kuang zi dong hua = Industry and mine automation Vol. 39; no. 5; pp. 63 - 66
Main Authors LYU Bin, NI Sai-sai, LIU Yang, ZHONG Li-na
Format Journal Article
LanguageChinese
Published Editorial Department of Industry and Mine Automation 01.05.2013
Subjects
current transformer
no-load charging
protection actio
relay protection
start-up standby transformer
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Summary:In view of problem that a 330 kV start-up standby transformer took place relay protection action in no-load charging, the paper indicated that the action was caused by grounding fault of A-phase current transformer through analyzing charging current waveform recorded by electric quantity analyzer, and gave several suggestions to improve safety and reliability of charging test of large-scale transformer: strengthen insulation inspection for current and voltage transformers of high-voltage side of transformer; properly increase sensitivity of main and backup protection to prevent relay protection action by inrush current; it should record for three-phase current and voltage of high-voltage side of transformer in charging process.
ISSN:1671-251X
DOI:10.7526/j.issn.1671-251X.2013.05.018