摘要
通过对二次直流系统一点接地的理论分析,得到各个参数对一点接地故障下继电器误动的影响程度。考虑继电器的等效电感参数建立直流系统等效电路,给出了直流二次回路一点接地故障的多阶动态解析方程,对正极一点接地、负极一点接地、继电器线圈正电源端一点接地故障暂态过程进行了定量计算,从理论上系统地分析了直流系统一点接地时继电器两端电压变化规律,得到各个参数变化对继电器两端电压的影响。利用PSCAD/EMTDC建立直流系统一点接地的仿真模型,验证了理论分析的正确性。
The influence of parameters on protective relaying misoperation is summarized by theoretical analysis of one point grounding in secondary DC systems. The paper establishes the multiple orders dynamic equations based on equivalent circuit of one point grounding in DC systems. The equivalent inductance of the relay is considered in these equations. These equations make calculations of kinds of one point groundings in DC system, including one point grounding in positive pole, in negative pole and in relay coil positive power. The variation law of voltage is systemically analyzed based on the analytic equations. And the influence of the parameters on the relay voltage is also obtained through the equations. PSCAD/EMTDC is used to establish a simulation model of one point grounding in DC systems, which verifies the correctness of the theoretical analysis.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2012年第21期138-141,146,共5页
Power System Protection and Control
关键词
直流系统
一点接地
继电器误动
电感参数
理论分析
DC system
one point grounding
15rotective relaying misoperation
inductance of relay
theoretical analysis
