GE D30 Instruction Manual page 459

8 THEORY OF OPERATION 8.3 GROUND DIRECTIONAL OVERCURRENT
I_op = |I_2| – |I_1| / 8 = 1.003 A > 0.25 A.
The overcurrent unit will pickup and the element will operate in the forward direction.
8
GE Multilin D30 Line Distance Protection System 8-17