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LYU Bin, NI Sai-sai, LIU Yang, ZHONG Li-na. Analysis of relay protection action of grounding fault of no-load charging of a 330 kV transformer[J]. Journal of Mine Automation, 2013, 39(5): 63-66.
Citation: LYU Bin, NI Sai-sai, LIU Yang, ZHONG Li-na. Analysis of relay protection action of grounding fault of no-load charging of a 330 kV transformer[J]. Journal of Mine Automation, 2013, 39(5): 63-66.
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Analysis of relay protection action of grounding fault of no-load charging of a 330 kV transformer

  • 1.

    Gansu Power Science Research Institute, Lanzhou 730050, China

  • 2.

    Lanzhou Longneng Electric Power Science and Technology Co., Ltd., Lanzhou 730070, China

  • 3.

    Guodian Jingyuan Generation Co., Ltd., Bai

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  • 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.
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