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Effects of series resistance on stator ground fault protection of large_capacity generator by resonant neutral grounding
Author(s): 
Pages: 5-8
Year: Issue:  11
Journal: JOURNAL OF NATIONAL BUREAU OF MACHINE BUILDING INDUSTRY,P.R.C.

Keyword:  消弧线圈定子接地传递过电压零序电压;
Abstract: 以三峡水轮发电机为例,阐述了大型水轮发电机中性点经消弧线圈接地的必要性.通过计算说明在消弧线圈中串联小值电阻可以起到限制传递过电压的作用,须注意的是电阻阻值的选取应从补偿电容电流和限制传递过电压两方面加以验算.在经耦合电容引起的传递过电压满足定子绕组绝缘要求时,应注意校验其对基波零序电压定子接地保护动作可靠性的影响,实例分析说明此传递过电压可引起基波零序电压定子接地保护的误动.
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