小电流接地系统单相接地故障选线及保护

姓名[1]

【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，建模仿真

Algorithm of Lithium Battery SOC Estimation Based on Kalman Filter

XXX1,

Abstract: Line selection and location of single-phase grounding fault in small-current system has always been a research hotspot. Based on the characteristics of single-phase grounding short circuit in small-current system, this paper proposes to use the combination of steady-state characteristics and transient characteristics information for fault line selection and protection, and then use the zero-sequence current generated after the fault to locate the single-phase grounding fault. The corresponding simulation model is built by MATLAB simulation software. The simulation results show that the results obtained by this scheme have little difference with the theory, which can complete the line selection and positioning of the small current system after single-phase grounding.

Small current grounding system refers to the neutral grounding mode is not effective grounding, short circuit current is small, the protection device does not need to travel immediately, 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. The design of the fault and its protection methods are briefly analyzed and modeling analysis.

Keywords: Small Line selection and protection of single-phase grounding fault in small current grounding system