CVT暂态特性对工频变化量距离保护的影响  

Influence of transient process of CVT on incremental power frequency distance relay

作　　者：刘海洋[1] 谈顺涛[1] 许志鹏[1] 孔庆源 

机构地区：[1]武汉大学电气工程学院,湖北武汉430072 [2]陕西省商洛供电局,陕西商洛726000

出　　处：《继电器》2006年第2期1-5,共5页Relay

摘　　要：结合EMTDC仿真试验分析得知,CVT暂态过程可能引起工频变化量距离保护超越,且超越现象与短路电压角度和系统线路阻抗比(SIR)值密切相关。在此基础上提出防止超越的措施———故障后提高暂态动作门槛。其具体做法是在推导出实时计算SIR值的基础上,根据SIR值自适应地提高动作门槛。EMTDC仿真试验结合保护仿真程序验证了此方案的有效性。Under analysis of the EMTDC experimental result, the conclusion is drawn that CVT transient process will make the incremental power frequency distance relay overreach which has close relation to the fault inception angle and SIR（ system impedance ratio） value. Based on above research, a new method enhancing the operating threshold after fault is proposed, which prevents the relay from oven＇caeh. Alter deducing the SIR value through the proposed way, the threshold is enhanced by the SIR adaptively. It is verified by EMTDC program and relay simulation program.

关 键 词：电各式电压互感器 暂态误差 工频变化量距离继电器 

分 类 号：TM773[电气工程—电力系统及自动化]