电流互感器开路产生高压的原因分析  

Analysis of Causees for Current Transformer Open-circuit Producing High Voltage

作　　者：周仕敏 ZHOU Shi-min(Shaoguan Qujiang Power Supply Bureau,Guangdong Grid Co.Ltd.,Shaoguan 512000,China)

机构地区：[1]广东电网有限责任公司韶关曲江供电局,广东韶关512000

出　　处：《电气开关》2020年第4期9-10,15,共3页Electric Switchgear

摘　　要：本文通过对CT开路情况下磁通与电流的关系及分类讨论在磁滞曲线线性区段和非线性区段及稳态电流和暂态电流不同情况下,分析了CT开路产生高压的原因。分析表明二次电动势的幅值不取决与电流互感器是否饱和,而是取决于零点到拐点间一次电流大小的变化快慢。又引用实验数据表明在一般情况下,稳态不产生高压。并推测仅有在暂态下,电流变化很快时,才会产生高压。This paper discusses hysteresis curres of linear sector and nonlinear sector and steady state current and transient current under different conditions through the relations and sorts of flux and current under CT open circuit conditions and analyzes causes of CT open circuit producing high voltage.The analysis shows that the amplitude of secondary electromotive force does not depend on whether the current transformer is saturation or not,but depends on chnaging speed of primary current which is big or small form zero poiut to knee point.Experimental data are also quoted shows that under the common conditions,saturation can not produce high voltage.It is inferred that under transient state,high voltage can only produced when current chages quickly.

关 键 词：电流互感器 高压生产 分类讨论 二次电动势 磁滞曲线 励磁电流 

分 类 号：TM452[电气工程—电器]