摘要
传统纵联差动受电流互感器饱和特性的影响,实际应用中可能出现误动的情况。在与传统纵联差动保护相比较的基础上,分析研究了电动机磁平衡式差动保护的工作原理及性能特征。通过对电动机正常运行、起动、以及区内外故障的分析,给出了磁平衡式差动保护的整定原则。研究表明磁平衡式差动保护能够大大提高电动机保护的灵敏性和可靠性。
Affected by saturation characteristics of current transformer, traditional differential protection may mis-operate sometimes.Based on the analysis of traditional differential protection, this paper introduces a novel magnetic balanced differential protection. According to the investigation of normal operation, start and external or internal fault for motor, the paper researches the performance of magnetic balanced differential protection. Furthermore, the setting principle is proposed. Theoretical research and industrial application show that magnetic balanced differential protection can improve sensitivity and reliability of motor protection greatly.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2010年第13期79-82,93,共5页
Power System Protection and Control
关键词
电动机
纵联差动保护
磁平衡式差动保护
电流互感器
中性点不接地系统
motor
pilot differential protection
magnetic balanced differential protection, current transformer
neutral ungrounded system
