Differential protection's unwarranted trip is often caused by saturation of TA. Avoid it by directionalpowerprotection.
差动保护因TA的饱和造成保护误动，采用功率方向保护避免因TA饱和造成误动。
2
The scheme includes the transverse differential protection, the directional relay action on negative sequence power of fault component and the incomplete differential protection.