传统谐波方向型高压电网漏电保护方案的改进与仿真分析

准确提取五次谐波信号和较灵敏的检测漏电保护启动值是谐波方向型高压电网漏电保护需要考虑的关键因素。通过总结传统谐波方向型漏电保护相关研究成果,并结合其存在的一些不足之处,提出"启动于零序电压及其突变量,选择性动作于零序电流五次谐波比幅比相"并以80C196为核心的微机应用系统来进行选择性漏电保护的新方案。基于漏电保护启动值以及漏电保护选线判据的改进措施,通过选取6 kV矿井高压电网作为仿真对象,对高压电网中任意一线路进行漏电仿真,仿真结果验证了改进的方案的灵敏性与可靠性。

Improvement of Traditional Harmonic Direction Type of HV(High-Voltage)Distribution Networks Leakage Protection and Simulation Analysis

Extract the 5th harmonic signal accurately and More sensitive detection leakage protection launched is the key factor in harmonic direction type of HV distribution networks leakage protection.Base on the research results of traditional harmonic direction leakage protection and combined with its shortcomings,proposes "Start at zero sequence voltage and its mutation,Alignment at the result of compared with amplitude and phase about 5th harmonic of zero sequence current" and take 80C196 as the core microcomputer application system. Base on the Improvement of leakage protection launched and selective criterion, By selecting 6 kV high-voltage power grid as a mine simulation object,simulating a leakage circuit of high-voltage power grid in arbitrary,simulation results show the improvement of scheme's sensitivity and reliability