互感线路接地距离Ⅰ段超越影响分析及其整定策略  

Overreach Impact Analysis and Setting Strategy of Zone Ⅰ of Grounding Distance Protection of Transmission Lines With Mutual Inductance

作　　者：邱建[1] 丁晓兵[1] 余江[1] 陈朝晖[1] 赵曼勇[1] 李正红[1] 李捷[1] 

机构地区：[1]中国南方电网电力调度控制中心,广东省广州市510623

出　　处：《电网技术》2017年第6期2035-2040,共6页Power System Technology

摘　　要：为防止互感线路接地距离Ⅰ段超越,分析电网运行方式对接地距离Ⅰ段的影响,确定定值边界十分必要。文章在互感线路测量阻抗分析完整模型的基础上进行分析,提出了接地距离Ⅰ段可能超越的3种极值工况模型。针对各极值工况对模型中各因素影响互感线路接地距离Ⅰ段测量阻抗的机理进行定性分析,确定求取测量阻抗极值的简化模型并解析定量求解极值,得出在极端情况下,接地距离Ⅰ段测量阻抗理论上可趋于0。利用整定软件进行算例仿真,验证了理论推导的正确性。根据极值工况模型,结合电网中实际典型工况提出了互感线路接地距离Ⅰ段在不同工况下的取值策略,以及统一整定为0.4倍线路正序阻抗的简化整定策略,从而提高了接地距离Ⅰ段定值的适应性。It is necessary to calculate setting boundary value based on analyzing impact of power grid operation mode to avoid overreach of zone I of grounding distance protection （GDP） of transmission lines with mutual inductance.This paper presents three extreme models possibly causing overreach of GDP zone I based on complete detecting impedance analysis model of transmission lines with mutual inductance. It analyzes qualitatively mechanism for various factors in the three extreme models influencing on measured impendence of GDP zone I. Simplified extreme model is presented and extreme values of the measured impendence are calculated. In extreme case, detecting impedance of GDP zone I may tend to zero. Example simulation with setting soitware proves correctness of theoretical derivation. Combining this model with typical cases of extreme values in power system, this paper proposes a simple setting strategy of GDP zone I that all values for various cases can be set as 0.4 times of positive sequence impedance to improve its adaptability.

关 键 词：互感线路 接地距离I段 极值工况 整定策略 

分 类 号：TM77[电气工程—电力系统及自动化]