电力系统及其自动化学报2019，Vol.31Issue(6)：67-73,7.DOI:10.19635/j.cnki.csu-epsa.000066
适应多点接地故障的小电阻接地系统集中式保护
Centralized Protection for Low-resistance Grounding System Under Multi-point Grounding Fault
摘要
Abstract
When a low-resistance grounding system is under multi-point(including multi-outlet)in-phase grounding fault,the zero-sequence current on faulty outlets will decrease obviously,and the sensitivity of the traditional zero-se?quence over-current protection will be reduced accordingly. Based on the comparison of amplitude and phase of zero-se?quence current between different outlets,a protection method suitable for multi-point grounding fault is proposed in this paper,in which a centralized protection device is used to collect the zero-sequence current information about each out?let;the protection is started by means of the zero-sequence current amplitude of the outlet or neutral point,and the line whose zero-sequence current amplitude is larger than that of any other one by a factor of a fixed number and whose phase leads by a certain angle is selected as the faulty outlet. The proposed method improves the traditional zero-se?quence over-current protection method in principle and realizes the protection under single-and multi-point grounding fault,which can effectively improve the reliability and sensitivity of grounding fault protection for the low-resistance grounding system. Finally,simulation results verify the feasibility of the proposed algorithm.关键词
小电阻接地系统/多点接地/高阻接地/接地保护/零序电流比较Key words
low-resistance grounding system/multi-point in-phase grounding/high-impedance grounding/grounding protection/zero-sequence current comparison分类
信息技术与安全科学引用本文复制引用
林志超,刘鑫星,王英民,薛永端,孙迪飞,王超..适应多点接地故障的小电阻接地系统集中式保护[J].电力系统及其自动化学报,2019,31(6):67-73,7.基金项目
国家自然科学基金资助项目(51307076) （51307076）
辽宁省教育厅资助项目(L2015213) （L2015213）
