电力系统保护与控制2017，Vol.45Issue(14)：51-56,6.DOI:10.7667/PSPC161036
小电流接地故障无功功率分析及选线新方法
Reactive power analysis and novel faulty selection method in resonant grounding system
摘要
Abstract
Because of the incorrect polarity connection of voltage transformer and current transformer in field,faulty feeder selection based on transient reactive power direction leads to wrong easily when there is a single-phase earth fault in resonant grounding system.In this paper,the effect of the incorrect polarity connection of voltage transformer and current transformer on transient reactive power and power-frequency reactive power is analyzed.A novel method using the power-frequency reactive power to correct the transient reactive power for faulty feeder selection is proposed.The faulty feeder is the one which the corrected transient reactive power is negative.If all of the corrected transient reactive powers are positive,it is bus fault.The proposed method is independent of polarity connection of voltage transformer and current transformer,which enlarges the selection scope.The feasibility of the new method is verified by digital simulation and field fault data.关键词
谐振接地系统/单相接地故障/故障选线/互感器极性反按/暂态无功功率方向Key words
resonant grounding system/single-phase earth fault/faulty feeder selection/incorrect polarity connection of transformer/transient reactive power direction引用本文复制引用
潘本仁,宋华茂,张秋凤,熊华强,俞小勇..小电流接地故障无功功率分析及选线新方法[J].电力系统保护与控制,2017,45(14):51-56,6.基金项目
This work is supported by National Natural Science Foundation of China (No.51477184).国家自然科学基金项目(51477184) （No.51477184）
江西省电力公司科技项目(521820150014) （521820150014）
