2005•Guangdong Electric PowerRequires access
Analysis on virtual earthing of busbar 2MCA in Shenzhen Mawan General Power Plant
Jiang An-xiang
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Abstract
The 6 kV working busbar 2MCA of Unit 2 in Shenzhen Mawan General Power Plant experienced virtual earthing while being put into operation and switching off the LV working transformer 42T A respectively. It is concluded upon analysis that the virtual earthing was caused by the power frequency resonance between the inductance coil of the voltage transformer and the busbar-to-ground capacitance,which led to neutral displacement and the unsymmetrical three phase-to-ground voltages,and in turn gave rise to zero-sequence voltage Finally, suggestions for eliminating the resonance are put forth in this paper.