10 kV配电网故障定位的研究和实现

随着对配电网供电可靠性要求的提高,配电网故障点的及时发现显得日渐重要,配电网的故障定位技术对于配电网安全可靠性具有非常重要的意义。本文在基于信号注入法的原理基础上,提出了一种"直流定段,交流定点"的交直流综合定位方法。该方法分两步走,第一步定出故障区域,第二步定出故障点,将直流信号和交流信号注入法相结合,优势互补,通过多次现场实验验证,可以有效地处理10kV配电网中的单相接地故障。本文阐述了交直流混合定位法的原理,并介绍了信号源的注入和信号的检测方法,最后利用现场试验数据和ATP仿真验证此方法的可行性。

Study and realization on fault location about 10 kV distribution network

As the requirement of reliability for distribution networks is raising,the prompt discovery of the fault point of distribution networks is becoming important.Therefore,the research of fault location of distribution networks is important.Based on principle of injecting current method,a synthesized fault location of AC and DC signal,which uses DC signal to fix the fault segment and AC signal to fix the fault position,is proposed in this paper.There are two steps in this method.The first step is fault region determination,and the second step is fault position determination.The method combining the DC signal with AC signal can effectively deal with single-phase grounding on 10 kV distribution networks,which is verified in experiment on spot.The paper expounds the principle of synthesized fault location of AC and DC signal,presents the injecting method of signal source and detecting method of method,and verifies the feasibility of this method with experiment on spot and the ATP simulation.