浅谈带有定值电阻的电流互感器技术  

Discussion on Current Transformer Technology with Fixed Resistance

作　　者：高庆利 宋仁丰 陈连友 高琦 GAO Qing-li;SONG Ren-feng;CHEN Lian-you;GAO Qi(Dalian North Instrument Transformer Group Co.,Ltd.,Dalian 116203,China)

机构地区：[1]大连北方互感器集团有限公司,辽宁大连116203

出　　处：《变压器》2023年第8期36-39,共4页Transformer

摘　　要：通过在环形铁心上绕制电流绕组,电流绕组的两端接一定值电阻,电流绕组与定值电阻构成串联回路,通过铁心主磁通一定,一次感应电动势一定,确定铁心磁感应强度即磁密,保证电流绕组每匝电压不变,并在同一个环形铁心上绕制抽头绕组,采用抽头式结构来满足多变比同时输出需求,传统抽头式多变比方案只能同时输出一种变比,为了满足这种抽头式能够同时多变比准确输出,通过调整抽头绕组不同匝数,二次侧均可以输出较大的电压信号,达到要求的二次输出电压值,依据二次检测设备实现从小电流到大电流更大范围准确监测,对线路接地故障起到过电流保护作用,为新型带有定值电阻的电流互感器设计和开发提供理论基础和技术支持。By winding the current winding on the annular iron core,the two ends of the current winding are connected with a certain value of resistance,and the current winding and the fixed value resistance form a series circuit.The magnetic induction intensity of the fixed iron core,namely,the magnetic density,ensures that the voltage of each turn of the current winding remains unchanged,and the tap winding group is wound on the same annular iron core.The tap structure is used to meet the simultaneous output demand of the multi ratio.The traditional tap type multi ratio scheme can only output one transformation ratio at the same time,In order to meet the requirement that this tap type can output accurately with multiple ratios at the same time,the tap winding has multiple secondary outlet terminals,each of which forms a different ratio.Based on the secondary detection equipment,accurate monitoring can be realized in a wider range from small current to large current,which plays an overcurrent protection role for line ground fault,and provides theoretical basis and technical support for the design and development of new current transformers with fixed resistance.

关 键 词：环形铁心 电流绕组 定值电阻 抽头绕组 

分 类 号：TM452[电气工程—电器]