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小电阻接地系统中接地变压器零序电流保护改进
引用本文:宁国丽,房亚囡,邢立功,高 亮,王广领,宗洪良.小电阻接地系统中接地变压器零序电流保护改进[J].电力自动化设备,2011,31(5):141-144.
作者姓名:宁国丽  房亚囡  邢立功  高 亮  王广领  宗洪良
作者单位:1. 天津市电力公司城南供电分公司,天津,300201
2. 天津市电力公司,天津,300010
3. 江苏金智科技股份有限公司,江苏,南京,211100
摘    要:配网中性点经小电阻地方式下发生单相接地故障时,传统的主变低压侧接地变压器的零序电流保护方案在保护动作时可能会不必要地跳开变压器低压侧2个分支断路器,导致事故停电范围扩大.现提出一种改进方案:利用故障发生时变压器低压侧两分支中流过的零序故障电流分布特征识别变压器低压侧故障分支,优先切除故障分支,避免停电范围扩大,当无法确...

关 键 词:小电阻接地  接地变压器  零序电流保护  iPACS-5941

Improvement of zero-sequence over-current protection for grounding transformer in low-resistance grounding power system
NING Guoli,FANG Yanan,XING Ligong,GAO Liang,WANG Guangling and ZONG Hongliang.Improvement of zero-sequence over-current protection for grounding transformer in low-resistance grounding power system[J].Electric Power Automation Equipment,2011,31(5):141-144.
Authors:NING Guoli  FANG Yanan  XING Ligong  GAO Liang  WANG Guangling and ZONG Hongliang
Affiliation:NING Guoli1,FANG Yanan2,XING Ligong2,GAO Liang3,WANG Guangling3,ZONG Hongliang3(1.Chengnan Branch of Tianjin Electric Power Corporation,Tianjin 300201,China,2.Tianjin Electric Power Corporation,Tianjin 300010,3.Wiscom System Co.,Ltd.,Nanjing 211100,China)
Abstract:When single-phase grounding fault occurs in low-resistance grounding power system,the traditional zero-sequence over-current protection of grounding transformer may unnecessarily trip two branch breakers at the low-voltage side of main transformer,for which,an improved scheme is presented:the distribution of zero-sequence currents in two branches is identified,only the breaker of faulty branch is tripped to limit the scope of outage;when none of them can be identified as faulty one,both breakers are tripped...
Keywords:iPACS-5941
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