主变差动保护功能校验分析与应用

Analysis and application of differential protection function calibration for main transformer

讨论了影响主变差动保护的主要因素及消除方法,并重点分析主变差动保护校验方法。该方法是在试验中采用在各侧加三相电流来实现的,并通过两组实验数据准确计算出比率制动系数,因此,该方法在现场调试主变差动保护有一定的指导作用。

The paper analyzed the main factors that effected the differential protection for main transformer and the elimination methods, especially focused on calibration method of differential protection for main transformer. The method was realized by adding three phases current in each side and calculated the ratio restraint coefficient by two sets of experimental statistics. Therefore, this method had a guide role in field debugging of differential protection for main transformer.