Neutral Current - GE Feeder Management Relay 750 Instruction Manual

5.6 S5 PROTECTION
5
a) MAIN MENU
PATH: SETPOINTS S5 PROTECTION

NEUTRAL CURRENT

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Four neutral overcurrent protection elements are provided. Two time overcurrent elements and two instantaneous overcur-
rent elements. They all monitor the calculated neutral current (3Io = Ia + Ib + Ic) which has DC offset and harmonic compo-
nents removed. Neutral overcurrent elements can be controlled by the neutral directional element allowing operation for
faults in the permitted direction only. Also, the elements can be blocked individually or as a group by logic inputs.
5-42
Courtesy of NationalSwitchgear.com
Figure 5–10: PHASE DIRECTIONAL LOGIC
NEUTRAL CURRENT
ð
NEUTRAL TIME OC 1
ENTER
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NEUTRAL TIME OC 2
ESCAPE
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NEUTRAL INST OC 1
ESCAPE
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NEUTRAL INST OC 2
ESCAPE
MESSAGE [ENTER] for more
NEUTRAL DIRECTION
ESCAPE
MESSAGE [ENTER] for more
750/760 Feeder Management Relay
5.6.3 NEUTRAL CURRENT
See below
See page 5–44.
See page 5–45.
5 SETPOINTS
GE Multilin