现场校核电流互感器的励磁特性和异常分析

通过实例 ,对电流互感器励磁特性的校验方法作了介绍。重点对特性曲线异常情况的原因作出分析。同时进行相应计算 ,根据继电保护要求判断设备能否投入运行 ,并提出不能满足要求时相应的改进办法。

Checking on Exciting Characteristics of CT in-situ & Analysing on Its Abnormal Phenomena

The fundalmentals of current transformer(CT)and the factors that influence its exciting characteristics are described briefly. Linking with a practical case, the checking method and abnomal phenomena of the exciting curve are analysed to find out the shortcomings of testing method and the quality weakness of CT. Then, according to the requirement of relay protection, a calculation is done to determine whether the CT could be put into use or not. At last, an improved method is recommended if the CT couldn't meet the needs of operation.