小电流接地系统单相接地故障选线论文+matlab仿真模型+仿真视频+参考资料

摘要

小电流系统单相接地故障选线以及定位一直是研究的热点，本文基于小电流系统出现单相接地短路后的特征，提出利用稳态特征和暂态特征信息结合的方式进行故障选线与保护，然后利用故障后产生的零序电流，对单相接地故障进行定位。通过MATLAB仿真软件搭建相应的仿真模型，仿真结果表明，该方案得到的结果与理论相差很小，能够完成小电流系统单相接地后的选线及定位。

小电流接地系统事指中性点接地方式为非有效接地，短路电流很小，保护装置不需要立即动作跳闸，从而提高了系统运行的可靠性，但是如果不能完成对故障线路处埋，容易扩大为两相对地短路，威胁电力系统的安全运行。本次设计对故障情况及其保护方法进行了简要分析并进行建模分析。

关键词：小电流接地系统；行波保护；故障保护

Abstract

Small current system of single-phase grounding fault line selection and location has always been the hot spot of the study, based on the small current characteristics after the one-phase ground fault system, put forward using the steady state characteristics and transient characteristics of the combination of fault line selection and protection, and then use after failure of zero sequence current, fixing the single-phase earth fault.The corresponding simulation model is built by MATLAB simulation software. The simulation results show that the results obtained by the scheme are very small compared with the theory, which can complete the line selection and positioning after single-phase grounding of the small current system.

Small current grounding system refers to the neutral point grounding mode is not effective grounding, the short circuit current is very small, the protection device does not need immediate action tripping, thus improving the reliability of the system operation, but if the fault line can not be buried, it is easy to expand into two relative short circuit, threatening the safe operation of the power system.This design has carried on the brief analysis to the fault situation and its protection method and carried on the modeling analysis.

Key words: Low current grounding system; Traveling wave protection; Fault protection

小电流接地系统单相接地故障选线论文+matlab仿真模型+仿真视频+参考资料_小电流接地系统-Matlab文档类资源-CSDN文库