摘要
配电线路末端没有直接相连的电压互感器、电流互感器等设备,行波检测困难。通过分析线路末端配电变压器绕组的杂散电容与铁芯、外壳耦合所感应的微弱电流信号,提出了一种通过测量配电变压器铁芯接地线的微弱电流来检测线路末端行波的新方法;通过建立配电变压器的高频暂态模型,给出故障行波信号的检测判据和高压侧线路故障与低压侧线路故障的行波辨识方法。仿真分析和现场实验结果表明:该方法能检测各种故障行波信号,具有可靠性和灵敏度高、抗干扰能力强的特点。
Distribution networks terminal traveling waves are difficult to detect, because there is no TV,TA or other measurement equipment directly connected at the distribution network terminal. The week capacitive current coupled between the distributedstray capacitance of transformer winding and core, shell was theoretical analyzed. A novel traveling wave detection method was developed by measuring the distribution transformer grounding current. The transformer transient model was built, and the detection criterion of traveling wave and the fault identification method for transformer high-voltage side and low-voltage side were proposed. The simulation and field experiment results show that the proposed method can detect all kinds of fault traveling waves with high reliability and sensitivity.
出处
《电力科学与技术学报》
CAS
北大核心
2016年第3期81-87,共7页
Journal of Electric Power Science And Technology
基金
国家自然科学基金(51425701
51277014)
关键词
配电线路
变压器接地线
行波检测
故障行波定位
distribution networks
transformertion with traveling waveearthed line
traveling wavfe idetectioa
fault loea-tion with traveling wave
