电力系统自动化2012，Vol.36Issue(20)：89-93,5.
计及直流偏磁的电流互感器传变特性对差动保护的影响
Transferring Characteristics of Current Transformer Affected by DC Magnetic Bias and Its Impact on Differential Protection
摘要
Abstract
The transferring characteristics of current transformers(TA) are subject to possible changes due to DC magnetic bias caused by geomagnetic induced current(GIC)/high voltage direct current(HVDC).The particularity of TA saturation affected by the DC magnetic bias will severely impact the transformer differential protection system.Based on the AC system simulation models considering DC magnetic bias,the effects caused by the variation of time-to-saturation of protective TAs are studied.Moreover,studies show that DC magnetic bias will lead to TA partial transient saturation.According to simulation of sympathetic inrush with DC magnetic bias,this paper analyzes the impacts on differential protection resulting from the TA partial transient saturation.The research demonstrates that DC magnetic bias may accelerate saturation of protective TAs.This is a challenge to the method of locating the time difference used for preventing maloperation due to TA saturation when external faults occurred.The research also shows that TA partial transient saturation caused by DC magnetic bias may contribute to maloperation of transformer differential protection.关键词
直流偏磁/电流互感器/差动保护/和应涌流Key words
DC magnetic bias/TA saturation/differential protection/sympathetic inrush分类
信息技术与安全科学引用本文复制引用
郑涛,陈佩璐,刘连光,刘春明,毛安澜..计及直流偏磁的电流互感器传变特性对差动保护的影响[J].电力系统自动化,2012,36(20):89-93,5.基金项目
国家重点基础研究发展计划（973计划）资助项目 （）
国家自然科学基金资助项目 （）
中央高校基本科研业务费专项资金资助项目 （）
苏州科技计划资助项目 （）
