电力系统自动化Issue(22)：84-89,6.DOI:10.7500/AEPS201210105
地磁感应电流对电流互感器传变特性及差动保护的影响
Effects of Geomagnetically Induced Current on Transferring Characteristics of Current Transformer and Transformer Differential Protection
摘要
Abstract
DC bias may affect the transferring characteristics of the current transformer,threatening the operation of differential protection.Compared with the DC bias caused by high voltage direct current (HVDC) transmission,the bias magnetic flux resulting from geomagnetically induced current (GIC) is more complex,especially when considering its effects on current transformer transferring characteristics.The differences between GIC bias and DC bias are analyzed in detail.According to the equivalent circuit of current transformer,the mechanism of current transformer saturation due to GIC is discussed.Then based on the characteristics of GIC,simulation models are developed in PSCAD/EMTDC,where low frequency sinusoidal currents are adopted to emulate GIC.Simulations are conducted to analyze current transformer transient saturation and partial transient saturation,the results of which demonstrate that effects of GIC may result in mal-operation of transformer differential protection,and should be given prompt attention.关键词
直流偏磁/电流互感器/地磁感应电流/局部暂态饱和Key words
DC bias/current transformer/geomagnetically induced current(GIC)/partial transient saturation引用本文复制引用
郑涛,陈佩璐,刘连光,毛安澜..地磁感应电流对电流互感器传变特性及差动保护的影响[J].电力系统自动化,2013,(22):84-89,6.基金项目
国家重点基础研究发展计划(973计划)资助项目(2012CB215206) （973计划）
国家自然科学基金项目(51177045) （51177045）
中央高校基本科研业务费专项资金资助项目(JB2011011)。This work is supported by National Basic Research Program of China (973 Program)(No.2012CB215206),National Natural Science Foundation of China (No.51177045) and Fundamental Research Funds for the Central Universities (No.JB2011011) （JB2011011）
