GE Multilin 745

S4 Elements745
Transformer Management Relay
Setpoints
http://www.GEindustrial.com/multilin
5–60
GE Multilin
• W1(3) GROUND TIME OC SHAPE: Select the time overcurrent curve shape to
be used for the Winding 1(3) Ground Time Overcurrent element. Refer to Time
Overcurrent Curves on page 5–50 for a description of the time overcurrent
curve shapes.
• W1(3) GROUND 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) GROUND TIME OC RESET: Enter the multiplier constant by which the
selected time overcurrent curve shape (the base curve) is to be shifted in time.
FIGURE 5–19: Ground Time Overcurrent Scheme Logic
c) Ground Instantaneous Overcurrent
PATH: SETPOINTS !" S4 ELEMENTS !" GROUND OC !" W1(3) GROUND INST OC 1(2)
• W1(3) GROUND INST OC 1(2) PICKUP: Enter the level of ground current (in
units of relay nominal current) above which the Winding 1(3) Ground
Instantaneous Overcurrent 1 element will pickup and start the delay timer.
• W1(3) GROUND INST OC 1(2) DELAY: Enter the time that the ground
current must remain above the pickup level before the element operates.
The messages above and scheme logic below are identical for Windings 2
and 3 of Ground Instantaneous Overcurrent 1 and all windings on the
Ground Instantaneous Overcurrent 2 element.
! W1 GND [!]
INST OC 1
W1 GROUND INST OC 1
FUNCTION: Disabled
Range: Enabled, Disabled
MESSAGE
W1 GROUND INST OC 1
TARGET: Latched
Range: Self-Reset, Latched, None
MESSAGE
W1 GROUND INST OC 1
PICKUP: 10.00 x CT
Range: 0.05 to 20.00 x CT in steps of
0.01
MESSAGE
W1 GROUND INST OC 1
DELAY: 0 ms
Range: 0 to 60000 ms in steps of 1
MESSAGE
W1 GROUND INST OC 1
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
NOTE