摘要
针对实际运行中线路电流互感器饱和或断线导致某一侧电流畸变或不可用,而无法实现故障定位,以及实际中线路两侧数据采样难以做到完全同步的情况,根据过渡阻抗的纯电阻性质,仅利用两侧电压和另一侧电流,提出了一种新的高精度实用故障定位算法。该方法测距精度不受功角、故障初始时刻影响,较好地解决了电流互感器饱和或断线影响测距的问题;无需两侧数据采样完全同步,而且计算量小,无伪根问题,具有较高的理论和实用价值。ATP-EMTP仿真结果表明,该方法正确,测距精度高。
The fault location is unable to realize in the actual operation of transmission lines, due to the current transformer saturation, the distortion or unavailable current at one side of breaking line, and the incomplete synchronization of sampling data at both sides of lines. According to this situation, a new accurate, practical fault location method was proposed with only using the voltage of both sides and the current of other side, based on the pure resistance properties of transition resistance. The new method offers a better solution for the fault location errors caused by current transformer saturation or line breaking, in which the accuracy of fault location is independent of power angle and fault inception time. This method doesnt require the complete synchronization of sampling data of both sides, as well as has a small amount of calculation without false root problem, and high theoretical and practical value. The simulation results of ATP-EMTP show that the proposed method is correct and has high accuracy.
出处
《电力建设》
2013年第9期123-128,共6页
Electric Power Construction
关键词
输电线路
继电保护
故障测距
电流互感器饱和
双π模型
过渡电阻
power transmission lines
relay protection
fault location
current transformer saturation
double r model
transition resistance
