1. 华北电力大学院电气与电子工程学院, 北京市 102206; 2. 中国南方电网电力调度控制中心, 广东省广州市 510530; 3. 国网沈阳供电公司, 辽宁省沈阳市 110003
1. School of Electrical and Electronic Engineering, North China Electric Power University, Beijing 102206, China; 2. China Southern Power Grid Dispatching and Control Center, Guangzhou 510530, China; 3. State Grid Shenyang Electric Power Supply Company, Shenyang 110003, China
The technology of disturbance signal injection at the busbar of medium voltage distribution network and cooperating with fault indicators to locate fault section has been used more and more widely. Disturbance signal sources at busbar can provide traveling wave signals, which provides the possibility of fault location. This paper proposes a traveling wave fault location method based on disturbance signal injection at busbar. If a permanent single-phase grounding fault occurs, the non-fault phase is switched to the ground via a resistance. Then an appropriate aerial mode component is selected according to the principle of traveling wave transmission and the fault distance can be calculated by the time difference between the arrival time of this component and the injection time of disturbance signal. Meanwhile, a solution to calculate the fault distance in the hybrid overhead-cable lines with branches is proposed. The least-square estimation is utilized to effectively merge multiple location results in order to improve the accuracy of fault location. The accuracy of the proposed technology is verified by the simulation and field test results.
QI Zheng, ZHUANG Shuyi, HE Xiqi,et al.Traveling Wave Fault Location Technology for Hybrid Lines in Distribution Network Based on Disturbance Signal Injection at Busbar[J].Automation of Electric Power Systems,2019,43(13):124-130. DOI:10.7500/AEPS20180726009.