GE Industrial Solutions Entellisys System User Manual - Manual (Page 113)

Setup 113
8
8.1.1 User settings for Bus Differential
The minimum settings for Bus Differential zones for both Alarm-Only and Trip Relays for
Topology 0 are:
Pickup Setting 1 & Pickup Setting 2 = 30 Amps
Time Delay 1 & Time Delay 2 = BAND 1
Backup Function (For Trip Relay only) = ENABLED
Backup Time Delta (For Trip Relay only) = Trip Immediately
NOTE: Although the Pickup is set to 30 Amps, Entellisys automatically enforces a “Zone
Minimum Pickup Setting” for Bus Differential. The “Zone Minimum Pickup Setting” is 20% of the
largest CT rating in the corresponding zone.
Figure 8-3 Reduced Let-Thru Mode settings for Bus Differential Relay