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| Fault Analysis and Setting Calculation on the 6kV Ground Fault |
| Yu Fang, Wang Wenzhi |
| Shenzhen Guangqian Electric Power Co.,Ltd. Shenzhen, Guangdong 518051 |
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Abstract Through the practical case of branch zero sequence over-current protection of start up/standby transformer and HV station transformer refuse operation when 6 kV ground fault happening, this article points out that the setting calculation not only needs to comply with the relative regulations and standardized methods, but also should combine with the status quo and the primary connecting mode. It puts forward three different situations to calculate fault current, using Multisim software. In comparison with actual figures, it summarizes distribution characteristics of fault current, chooses the best proposal, which ensures the correctness of protection, optimizes the protection setting value, and improves the reliability of protection．
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Published: 10 October 2013
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[1] 张树权,张小宁.一起6kV零序保护动作原因分析,华北电力技术,2011(3):46-49.
[2] 深圳前湾燃机电厂启备变及厂用电保护整定计算报告.
[3] 张柳,解奎元,王丽,大型火电厂变压器分支零序保护误动案例分析,电力系统保护与控制,2010,38(23): 223-226. |
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2013, Vol. 14 
