5-42 750/760 Feeder Management Relay GE Multilin
5.6 S5 PROTECTION 5 SETPOINTS
5
Figure 5–10: PHASE DIRECTIONAL LOGIC
5.6.3 NEUTRAL CURRENT
a) MAIN MENU
PATH: SETPOINTS ÖØ S5 PROTECTION ÖØ NEUTRAL CURRENT
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.
îš„ NEUTRAL CURRENT
îš„ [ENTER] for more
îš„ NEUTRAL TIME OC 1
îš„ [ENTER] for more
See below
îš„ NEUTRAL TIME OC 2
îš„ [ENTER] for more
îš„ NEUTRAL INST OC 1
îš„ [ENTER] for more
See page 5–44.
îš„ NEUTRAL INST OC 2
îš„ [ENTER] for more
îš„ NEUTRAL DIRECTION
îš„ [ENTER] for more
See page 5–45.
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Courtesy of NationalSwitchgear.com