GE 750 - Description

12-
30
750/760 Feeder Management Relay GE Power Management
12.5 SENSITIVE GROUND CURRENT 12 S5 PROTECTION
12
12.5 SENSITIVE GROUND CURRENT 12.5.1 DESCRIPTION
Two sensitive ground overcurrent protection elements are provided. One time overcurrent element and one
instantaneous element. Sensitive ground overcurrent elements can be controlled by the sensitive ground direc-
tional element allowing operation for faults in the permitted direction only. Also, the elements can be blocked
individually or as a group by logic inputs.
12.5.2 SENSITIVE GROUND TIME OVERCURRENT
The sensitive ground time overcurrent element, ANSI device 51SG is programmed in this subgroup.
■ SENSTV GND TIME OC
■ [ENTER] for more
The Sensitive Ground Time Overcurrent setpoints path is:
\ SETPOINTS \ S5 PROTECTION \ SENSTV GND CURRENT \ SENSTV GND TIME OC
SENSTV GND TIME OC
FUNCTION: Disabled
Range: Disabled, Trip, Trip & AR, Alarm, Latched Alarm, Control
Select the required function.
SENSTV GND TIME OC
RELAYS (3-7): -----
Range: Any Combination of the 3-7 AUXILIARY Relays
Select the output relays required.
SENSTV GND TIME OC
PICKUP: 1.00 x CT
Range: 0.005 to 1.000 in steps of 0.001 x CT
Select the sensitive ground current level required for pickup.
SENSTV GND TIME OC
CURVE: Ext Inverse
Range: Ext Inverse, Very Inverse, Norm Inverse, ..., Flex Curve B
See description in Section 12.1: TIME OVERCURRENT CURVE CHARAC-
TERISTICS on page 12–1.
SENSTV GND TIME OC
MULTIPLIER: 1.00
Range: 0.00 to 100.00 in steps of 0.01
See description in Section 12.1: TIME OVERCURRENT CURVE CHARAC-
TERISTICS on page 12–1.
SENSTV GND TIME OC
RESET: Instantaneous
Range: Instantaneous, Linear
See description in Section 12.1: TIME OVERCURRENT CURVE CHARAC-
TERISTICS on page 12–1.
SENSTV GND TIME OC
DIRECTION: Disabled
Range: Disabled, Forward, Reverse
Select the direction(s) of current flow for which operation is permitted.