S4 Elements
745
Transformer Management Relay
Setpoints
http://www.GEindustrial.com/multilin
5–57
GE Multilin
b) Neutral Time Overcurrent
PATH: SETPOINTS !" S4 ELEMENTS !" NEUTRAL OC !" W1(3) NTRL TIME OC
• W1(3) NEUTRAL TIME OC PICKUP: Enter the level of neutral current (in
units of relay nominal current) above which the Winding 1(3) Neutral Time
Overcurrent element will pickup and start timing.
• W1(3) NEUTRAL TIME OC SHAPE: Select the time overcurrent curve shape
to be used for the Winding 1(3) Neutral Time Overcurrent element. The Time
Overcurrent Curves on page 5–50 describe the time overcurrent curve shapes.
• W1(3) NEUTRAL TIME OC MULTIPLIER: Enter the multiplier constant by
which the selected time overcurrent curve shape (the base curve) is to be
shifted in time.
• W1(3) NEUTRAL TIME OC RESET: Select “Linear” reset to coordinate with
electromechanical time overcurrent relays, in which the reset characteristic
(when the current falls below the reset threshold before tripping) is proportional
to ratio of energy accumulated to that required to trip. Select “Instantaneous”
reset to coordinate with relays, such as most static units, with instantaneous
reset characteristics.
FIGURE 5–17: Neutral Time Overcurrent Scheme Logic
! W1 NTRL [!]
TIME OC
W1 NEUTRAL TIME OC
FUNCTION: Enabled
Range: Enabled, Disabled
MESSAGE
W1 NEUTRAL TIME OC
TARGET: Latched
Range: Self-Reset, Latched, None
MESSAGE
W1 NEUTRAL TIME OC
PICKUP: 0.85 x CT
Range: 0.05 to 20.00 x CT in steps of
0.01
MESSAGE
W1 NEUTRAL TIME OC
SHAPE: Ext Inverse
Range: see description below
MESSAGE
W1 NEUTRAL TIME OC
MULTIPLIER: 1.00
Range: 0.00 to 100.00 in steps of 0.01
MESSAGE
W1 NEUTRAL TIME OC
RESET: Linear
Range: Instantaneous, Linear
MESSAGE
W1 NEUTRAL TIME OC
BLOCK: Disabled
Range: Logc Inpt 1 to 16, Virt Inpt 1 to
16, Output Rly 2 to 8, SelfTest
Rly, Vir Outpt 1 to 5, Disabled
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