电力系统保护与控制2017，Vol.45Issue(11)：89-94,6.DOI:10.7667/PSPC160859
一种基于拖尾电流识别的失灵保护实现
Implement method of breaker failure protection based on subsidence current blocking
万洛飞 1李志坚 2宋斌 1龙锋 2赵瑞辰1
作者信息
- 1. 南瑞集团公司(国网电力科学研究院),江苏 南京 210006
- 2. 国电南瑞科技股份有限公司,江苏 南京 210006
- 折叠
摘要
Abstract
When the fault current is successfully interrupted by the CB open, it always contains a subsidence current in the secondary side of the current transformer (CT), and this current extends the reset time of the breaker failure current, which may lead to breaker failure protection's maloperation. Now, it used to increase the delay time of breaker failure protection to avoid maloperation. In this way, when the CB is real failure, breaker failure protection will take much more time to open the CB, and this does not meet the fast feature of protection relay. In this paper, based on difference characteristic between subsidence current and other current, it presents a method to identify subsidence current fast. In this method, it effectively avoids breaker failure protection's maloperation by the recognition of subsidence current without increase the time delay. In the last, the RTDS is used to test the breaker failure protection integrated with the subsidence current blocking function. The result shows that the improved breaker failure protection takes good operation behavior in both fault current condition and subsidence current condition. No maloperation on the subsidence current condition, no non-action on the fault current condition.关键词
失灵保护/电流互感器/拖尾电流/波形识别/RTDSKey words
breaker failure protection/current transformer/subsidence current/current wave identification/RTDS引用本文复制引用
万洛飞,李志坚,宋斌,龙锋,赵瑞辰..一种基于拖尾电流识别的失灵保护实现[J].电力系统保护与控制,2017,45(11):89-94,6.
