9 THEORY OF OPERATION
9.4 DIRECTIONAL PRINCIPLE
The B90 implementation calculates the maximum angle for the considered currents and compares it against a fixed thresh-
old of 90°. The flag indicating whether the directional protection principle is satisfied is available as the FlexLogic™ oper-
and
.
BUS 1(4) DIR
9
GE Multilin
B90 Low Impedance Bus Differential System
9-7