5-66
745 Transformer Management Relay
GE Multilin
5.6 S4 ELEMENTS
5 SETPOINTS
5
b) NEGATIVE SEQUENCE TIME OVERCURRENT
PATH: SETPOINTS
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S4 ELEMENTS
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NEG SEQ OC
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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 Time Overcurrent Curves on page 5–49 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 TOC SCHEME LOGIC
W1 NEG SEQ TIME OC
[ENTER] for more
W1 NEG SEQ TIME OC
FUNCTION: Enabled
Range: Enabled, Disabled
W1 NEG SEQ TIME OC
TARGET: Latched
Range: Self-Reset, Latched, None
W1 NEG SEQ TIME OC
PICKUP: 0.25 x CT
Range: 0.05 to 20.00 x CT in steps of 0.01
W1 NEG SEQ TIME OC
SHAPE: Ext Inverse
Range: see description below
W1 NEG SEQ TIME OC
MULTIPLIER: 1.00
Range: 0.00 to 100.00 in steps of 0.01
W1 NEG SEQ TIME OC
RESET: Linear
Range: Instantaneous, Linear
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
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