GE b30 - Page 402

8-12 B30 Bus Differential System GE Multilin
8.6 OUTPUT LOGIC AND EXAMPLES 8 THEORY OF OPERATION
8
Figure 8–11: INTERNAL FAULT EXAMPLE
836736A1.CDR
The bus differential protection element picks up
The element operates in 10ms
The directional flag is set
All the fault currents
are seen in one
direction
The saturation flag is not set - no directional decision required