电力系统保护与控制2011，Vol.39Issue(8)：104-106,134,4.
不对称短路故障下非故障6kV电动机速断保护动作行为分析
Analysis of 6 kV no-fault motor instantaneous trip protection action on asymmetrical short-circuit faults
高博 1罗亚桥 1郑国强 1宋卓1
作者信息
- 1. 安徽省电力科学研究院,安徽,合肥,230601
- 折叠
摘要
Abstract
Based on the symmetrical component method, this paper analyses the voltage vector of two asymmetrical short-circuit faults including single-phase grounding fault and two-phase grounding fault, and also analyses the operation condition of 6 kV system at different sequence voltages. The analysis results show that in the situation of asymmetrical short-circuit faults, especially in the two-phase grounding faults, the instantaneous trip protection of no-fault motors maybe falsely act because of large current which produced by negative voltage. To solve the problem, this paper presents an idea that not only the startup current, but also the negative voltage at asymmetrical short-circuit fault is needed to be considered in motor instantaneous trip protection setting and checking.关键词
对称分量法/电压向量/电动机/速断保护/不对称短路Key words
symmetrical component method/ voltage vector/ motor/ instantaneous trip protection/ asymmetrical short-circuit faults分类
信息技术与安全科学引用本文复制引用
高博,罗亚桥,郑国强,宋卓..不对称短路故障下非故障6kV电动机速断保护动作行为分析[J].电力系统保护与控制,2011,39(8):104-106,134,4.
