电力系统保护与控制2012，Vol.40Issue(4)：129-133,5.
变压器区外故障CT饱和对主变保护的影响分析
Analysis on outside transformer fault causing CT saturation and its influence on transformer protection
邓茂军 1许云龙 1张童 2姚晴林 3马和科 1姚东晓1
作者信息
- 1. 许继电气公司技术中心,河南许昌461000
- 2. 许继电气股份有限公司,河南许昌461000
- 3. 合肥工业大学,安徽合肥230009
- 折叠
摘要
Abstract
In recent years, transformer instantaneous differential protection misoperated several times on the site. As a secondary protection, transformer instantaneous differential protection should act as fast as possible without any blocking logic when serious internal faults occur in the transformer and the differential current value is bigger than the trip value. Through on-site analysis of several accidents, CT saturation during external fault is the direct reason that causes instantaneous differential protection misoperation. Through analyzing the reason why P level CT is easily saturated, this paper improves the instantaneous differential protection's action logic for different fault types, which is very easy to implement in computer protection. The results show that the improved scheme can significantly improve the protection's capacity against CT saturation in external fault without reducing the acting sensitivity in internal fault.关键词
主变/差流速断保护/CT饱和/灵敏度Key words
transformer/ instantaneous differential protection/ CT saturation/ sensitivity分类
信息技术与安全科学引用本文复制引用
邓茂军,许云龙,张童,姚晴林,马和科,姚东晓..变压器区外故障CT饱和对主变保护的影响分析[J].电力系统保护与控制,2012,40(4):129-133,5.
