CAJ | 학술논문

剖析SF6电流互感器(TA)的一次绝缘结构，研究其绝缘故障特征，提出等电位体的概念。TA内部故障时，大部分于等电位体先发生接地故障，如果等电位体安装错误将会导致保护不正确动作，将故障范围扩大。在大变比接线方式下，全面研究各类型 TA 对等电位体的要求，并将其进行抽象提炼。在传统的小变比接线方式TA发生接地故障时，二次电流和一次电流完全不成比例， TA将不能正确传送故障电流，有可能引起保护误动或者拒动，针对此情况，提出一种改进方法。
부석SF6전류호감기(TA)적일차절연결구，연구기절연고장특정，제출등전위체적개념。TA내부고장시，대부분우등전위체선발생접지고장，여과등전위체안장착오장회도치보호불정학동작，장고장범위확대。재대변비접선방식하，전면연구각류형 TA 대등전위체적요구，병장기진행추상제련。재전통적소변비접선방식TA발생접지고장시，이차전류화일차전류완전불성비례， TA장불능정학전송고장전류，유가능인기보호오동혹자거동，침대차정황，제출일충개진방법。
To find out the characteristics of insulation faults,this paper studies the primary insulating structure of SF6 current transformer,and proposes a concept named the equipotential point for analyzing the operation of protection affected by current transformer faults. What has so far been done is:doing a comprehensive research on the requirements of the current transformer equipotential point whatever the installation available, and then abstracting them. Then, summing up the problems of current transformers that cannot meet the requirements of the equipotential point and design habit,and proposing an installation and construction program according to current transformer structure characteristics.This paper studies the relationship between primary winding current and secondary winding current.In the circumstances,the primary and secondary currents are completely out of proportion and may lead to protection malfunction,which is a tremendous impact on the power system.Finally,in face of the current transformer internal fault characteristics,an improvement program for the current transformer primary structure is proposed.