A better connection for digital protection is also proposed,which takes the inter phase voltage as the input of the directional element at low voltage side and make interior angle setting easier.

• 最后针对数字式保护的特点 ,采用与中、高压侧相间电压满足同相位关系的低压侧相间电压差作为方向元件的电压量的接线方式 ,提出了一种更好的、使内角整定计算更为方便的功率方向元件的接线方式。