利用重合闸暂态行波的输电线路故障测距

Transmission Line Fault Locating with Transient Traveling Waves Caused by Re-closure

系统地分析了输电线路重合闸暂态行波的产生机理和传播特性,在此基础上提出利用重合闸暂态行波的输电线路故障测距原理,即E型现代行波测距原理,并详细分析了这种原理的4种运行模式,即标准模式、扩展模式1、扩展模式2和综合模式。然后,对故障点反射波和对端断路器触头反射波的识别问题进行了初步探讨。EMTP仿真和实测暂态波形分析表明,利用重合闸暂态行波的输电线路故障测距原理是可行的,并且通过与其他行波测距原理配合使用,能够提高永久性故障的测距可靠性。

The generation mechanism and propagation characteristics of transient traveling waves caused by re-closure of transmission lines is analyzed. Based on this analysis, a transmission line fault locating principle using traveling waves caused by re-closure is presented, and four independent operation modes of this principle such as： standard mode, extension mode 1, extension mode 2 and comprehensive mode are analyzed in detail. Then, a key issue is explored about the discrimination of the reflected surges coming from the fault point and the opposite end of the fault line. EMTP simulation and actual transient waveform analysis show that the transmission line fault locating principle with traveling waves caused by re-closure is feasible, and through the coordination with other fault locating principles based on traveling wave, the locating reliability for permanent fault can be improved.