GE Industrial Solutions Entellisys 5.0 User Manual - Manual (Page 152)

Reduced Energy Let-Thru Mode 148
8
8.2.2 RELT Settings for Bus Differential
Bus Diff will operate using Topology 0 settings while in Multi-point RELT or System Wide RELT.
See
Section 7.1: Bus Differential Relay on page 115 for more information.
The minimum settings for Bus Differential zones for both Alarm-Only and Trip Relays for
Topology 0 are:
NOTE: Although the Pickup is set to 100 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.
8.2.3 RELT Settings for Multi-Source Ground-Fault
Multi-Source Ground-Fault will operate on Topology 0 settings while in Multi-point RELT or
System Wide RELT. See
Section 7.2: Multi-Source Ground-Fault Relay on page 119 for more
information.
The minimum settings for Multi-Source Ground-Fault zones for both Alarm-Only and Trip
Relays for Topology 0 are:
Setting Value
Pickup Setting 1 & Pickup Setting 2 100A
Time Delay 1 & Time Delay 2 BAND 1
Backup Function (For Trip Relay only) Enabled
Backup Time Delta (For Trip Relay only) Trip
Immediately
Setting Value
Pickup Setting 30 Amps
Time Delay BAND 1
Curve I 2 T DISABLED
Backup Function (For Trip Relay only) Trip
Immediately
Backup Time Delta (For Trip Relay only) Trip
Immediately