摘要
变压器差动保护不仅与电流大小有关,更与接入的CT极性有关。如果CT极性接反了,在主变正常运行时差流为两侧电流的叠加值,导致差动保护误动作。因此,保证电流互感器二次极性接线正确尤为重要。
The differential protection of transformer is related to the current value and the polarity of CT connected. If the polarity of CT is reversed, the differential current is the superposition value of current on both sides, resulting in misoperation of differential protection. Therefore, it is especially important to ensure correct secondary polarity connection of current transformer.
出处
《水电站机电技术》
2017年第12期5-9,共5页
Mechanical & Electrical Technique of Hydropower Station
关键词
CT极性
CT并联
差动保护
Polarity of CT
Parallel connection of CT
Differential protection
