Suzhou Electric Appliance Research Institute
期刊号: CN32-1800/TM| ISSN1007-3175

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出线开关拒动致35 kV全站失电的分析

来源:电工电气发布时间:2020-09-18 15:18 浏览次数:60
出线开关拒动致35 kV全站失电的分析
 
许超1,周科峰1,顾春华2,周林勇3,赵帅1
(1 国网江苏省电力有限公司南京供电分公司,江苏 南京 210019;2 国网江苏省电力有限公司盐城供电分公司,江苏 盐城 224100;
3 江苏兴力建设集团有限公司,江苏 南京 210000)
 
    摘 要:介绍了一起由于10 kV线路出线开关拒动,一系列后备保护动作致使35 kV变电站全站失电的故障。分析了故障前系统运行方式,发现在该非正常运行方式下10 kV母联开关并未设置保护,存在安全隐患。阐述了故障发生的过程及应对措施,通过保护信号分析判断故障原因为线路开关拒动致使后备保护动作,运行方式安排不合理使得故障范围扩大。理论分析表明当前方式下,保护装置动作正确。仿真分析验证了在此运行方式下,保护动作会使故障范围扩大,最终导致全站失电。
    关键词:开关拒动;运行方式;后备保护;故障分析
    中图分类号:TM564     文献标识码:B     文章编号:1007-3175(2020)09-0033-05
 
The Analysis of 35 kV Power Station Power Failure Caused by a Refusing Action of a Line Breaker
 
XU Chao1, ZHOU Ke-feng1, GU Chun-hua2, ZHOU Lin-yong3, ZHAO Shuai1
(1 Nanjing Power Supply Company, State Grid Jiangsu Electric Power Co., Ltd, Nanjing 210019, China;
2 Yancheng Power Supply Company, State Grid Jiangsu Electric Power Co., Ltd, Yancheng 224100, China;
3 Jiangsu Xingli Construction Group Co., Ltd, Nanjing 210000, China)
 
    Abstract: This paper introduced a failure that due to the immovable of the 10 kV line outlet switch, a series of backup protection actions caused the 35 kV substation to lose power.Firstly, system operation mode before the fault is analyzed. Under this abnormal operation mode safety hazard exist because no correlated protection is settled within the 10 kV bus switch. In the following, the failure process and solutions are described. By analyzing of protection message, reason for the failure is found, that isline breaker refuse to operate which leads to the action of back up protection then the abnormal operation mode leads to the expansion of fault area. In the end, theoretical analysis shows the correctness of protection under this circumstance. Simulation analysis proves that in this situation, fault area will be expanded, which eventually leads to total loss of electricity.
    Key words: refusing action; operation mode; backup protection; fault analysis
 
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