GE 750 User Manual

GE Power Management 750/760 Feeder Management Relay 12-
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12 S5 PROTECTION 12.4 GROUND OVERCURRENT
12
12.4 GROUND OVERCURRENT 12.4.1 DESCRIPTION
Separate protection is provided for ground time overcurrent and ground instantaneous overcurrent. These ele-
ments monitor the ground current input on terminals G10 and H10. Ground overcurrent elements can be
blocked individually or as a group by logic inputs. Ground overcurrent elements can be controlled by the
ground directional element allowing operation for faults in the permitted direction only.
12.4.2 GROUND TIME OVERCURRENT
The equivalent of a single ground time overcurrent relay, ANSI device 51G, is programmed in this subgroup.
■ GROUND TIME OC
■ [ENTER] for more
The Ground Time Overcurrent setpoints path is:
\ SETPOINTS \ S5 PROTECTION \ GROUND CURRENT \ GROUND TIME OC
GROUND TIME OC
FUNCTION: Disabled
Range: Disabled, Trip, Trip & AR, Alarm, Latched Alarm, Control
Select the required function.
GROUND TIME OC
RELAYS (3-7): -----
Range: Any Combination of the 3-7 AUXILIARY Relays
Select the output relays required.
GROUND TIME OC
PICKUP: 1.00 x CT
Range: 0.05 to 20.00 in steps of 0.01 x CT
Select the current level required.
GROUND 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.
GROUND 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.
GROUND TIME OC
RESET: Instantaneous
Range: Instantaneous, Linear
See description in Section 12.1: TIME OVERCURRENT CURVE CHARAC-
TERISTICS on page 12–1.
GROUND TIME OC
DIRECTION: Disabled
Range: Disabled, Forward, Reverse
Select the direction(s) of current flow for which operation is permitted.

GE 750 Specifications

General

Brand	GE
Model	750
Category	Relays
Language	English