GE TRANSFORMER MANAGEMENT RELAY 745 Instruction Manual page 116

5.6 S4 ELEMENTS
b) NEGATIVE SEQUENCE TIME OVERCURRENT
PATH: SETPOINTS S4 ELEMENTS
W1 NEG SEQ TIME OC
[ENTER] for more
• 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.
5
• 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.
5-66
Courtesy of NationalSwitchgear.com
NEG SEQ OC W1(3) NEG SEQ TIME OC
ð
W1 NEG SEQ TIME OC
ENTER
FUNCTION: Enabled
ESCAPE
W1 NEG SEQ TIME OC
ESCAPE
TARGET: Latched
MESSAGE
W1 NEG SEQ TIME OC
ESCAPE
PICKUP: 0.25 x CT
MESSAGE
W1 NEG SEQ TIME OC
ESCAPE
SHAPE: Ext Inverse
MESSAGE
W1 NEG SEQ TIME OC
ESCAPE
MULTIPLIER: 1.00
MESSAGE
W1 NEG SEQ TIME OC
ESCAPE
RESET: Linear
MESSAGE
W1 NEG SEQ TIME OC
ESCAPE
BLOCK: Disabled
MESSAGE
Figure 5–27: NEGATIVE SEQUENCE TOC SCHEME LOGIC
745 Transformer Management Relay
Range: Enabled, Disabled
Range: Self-Reset, Latched, None
Range: 0.05 to 20.00 x CT in steps of 0.01
Range: see description below
Range: 0.00 to 100.00 in steps of 0.01
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
5 SETPOINTS
GE Multilin