S4 Elements
745
Transformer Management Relay
Se
tpoints
http://www.GEindustrial.com/multilin
5–65
GE Multilin
b) Negative Sequence Time Overcurrent
PATH: SETPOINTS
!"
S4 ELEMENTS
!"
NEG SEQ OC
!
W1(3) NEG SEQ TIME OC
•
W1 (3) NEG SEQ TIME OC PICKUP
: Enter the level of negative sequence
current (in units of relay nominal current) above which the Winding 1(3)
Negative Sequence Time Overcurrent element will pickup and start timing.
•
W1 (3) NEG SEQ TIME OC SHAPE
: Select the time overcurrent curve shape
to be used for the Winding 1(3) Negative Sequence Time Overcurrent element.
Refer to
on page 5–50 for a description of the time
overcurrent curve shapes.
•
W1 (3) NEG SEQ 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) NEG SEQ 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 5–27: Negative Sequence Time Overcurrent Scheme Logic
!
W1 NEG SEQ
[
!
]
TIME OC
W1 NEG SEQ TIME OC
FUNCTION: Enabled
Range: Enabled, Disabled
MESSAGE
W1 NEG SEQ TIME OC
TARGET: Latched
Range: Self-Reset, Latched, None
MESSAGE
W1 NEG SEQ TIME OC
PICKUP:
0.25 x CT
Range: 0.05 to 20.00 x CT in steps of
0.01
MESSAGE
W1 NEG SEQ TIME OC
SHAPE: Ext Inverse
Range: see description below
MESSAGE
W1 NEG SEQ TIME OC
MULTIPLIER:
1.00
Range: 0.00 to 100.00 in steps of 0.01
MESSAGE
W1 NEG SEQ TIME OC
RESET: Linear
Range: Instantaneous, Linear
MESSAGE
W1 NEG SEQ 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
Summary of Contents for Multilin 745
Page 2: ......
