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745
Transformer Management Relay
! W1 PHASE
TIME OC
5–54
c) Winding 1(3) Phase Time Overcurrent
PATH: SETPOINTS
!"
S4 ELEMENTS
[!]
W1 PHASE TIME OC
FUNCTION: Enabled
W1 PHASE TIME OC
MESSAGE
TARGET: Latched
W1 PHASE TIME OC
MESSAGE
PICKUP:
W1 PHASE TIME OC
MESSAGE
SHAPE: Ext Inverse
W1 PHASE TIME OC
MESSAGE
MULTIPLIER:
W1 PHASE TIME OC
MESSAGE
RESET: Linear
W1 PHASE TIME OC
MESSAGE
BLOCK: Disabled
W1 HARMONIC DERATING
MESSAGE
CORRECTION: Disabled
•
W1(3) PHASE TIME OC PICKUP: Enter the phase current level (in units of
relay nominal current) above which the Winding 1(3) Phase Time Overcurrent
element will pickup and start timing.
•
W1(3) PHASE TIME OC SHAPE: Select the time overcurrent curve shape to
use for the Winging 1(3) Phase Time Overcurrent. Time Overcurrent Curves on
page 5–50 describes the TOC curve shapes.
•
W1(3) PHASE 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) PHASE 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.
•
W1(3) HARMONIC DERATING CORRECTION: Select "Enabled" to enable
automatic harmonic derating correction of the Winging 1(3) Phase Time
Overcurrent curve. The 745 calculates the derated transformer capability when
supplying non-sinusoidal load currents (as per ANSI / IEEE C57.110-1986) and,
when this feature is enabled, automatically shifts the phase time overcurrent
curve pickup in order to maintain the required protection margin with respect to
the transformer thermal damage curve, as illustrated below.
http://www.GEindustrial.com/multilin
!"
PHASE OC
!
W1(3) PHASE TIME OC
Range: Enabled, Disabled
Range: Self-Reset, Latched, None
Range: 0.05 to 20.00 x CT in steps of
0.01
1.20 x CT
Range: see description below
Range: 0.00 to 100.00 in steps of 0.01
1.00
Range: Instantaneous, Linear
Range: Logc Inpt 1 to 16, Virt Inpt 1 to
16, Output Rly 2 to 8, SelfTest
Rly, Vir Outpt 1 to 5, Disabled
Range: Logic Input 1 to 16, Disabled
S4 Elements
GE Multilin
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