CT饱和引起变压器差动保护误动的分析与对策

Analysis and countermeasure of transformer differential protection malfunction due to CT saturation

对电流互感器(CT)饱和后变压器差动保护误动机理进行了分析,并在对各种传统的防治CT饱和措施分析的基础上,提出采用Rogowski线圈作传感头解决CT饱和的新方法。基于Rogowski线圈的电子式电流互感器以其线性度好、无磁饱和、频带宽、高精度和高可靠性等特点,成为传统差动保护用CT的理想替代品。

By analyzing the mechanism of transformer differential protection malfunction after current transformer(CT) saturated,on the basis of analyzing various traditional countermeasures of CT saturation,this paper puts forward a new method of using Rogowski coils as sensor to solve the CT saturation problem.The electronic current transformer based on Rogowski coils will become the perfect substitute for the traditional CT differential protection beacause of its good linearity, no magnetic saturation,wide range frequency,high precision and reliability, etc.