Table of Contents
Advertisement
5 SETPOINTS
b) NEUTRAL TIME OVERCURRENT
PATH: SETPOINTS
S4 ELEMENTS
W1 NTRL TIME OC
[ENTER] for more
•
W1(3) NEUTRAL TIME OC PICKUP: Enter the level of neutral current (in units of relay nominal current) above which
the Winding 1(3) Neutral Time Overcurrent element will pickup and start timing.
•
W1(3) NEUTRAL TIME OC SHAPE: Select the time overcurrent curve shape to be used for the Winding 1(3) Neutral
Time Overcurrent element. Time Overcurrent Curves on page 5–49 describes the time overcurrent curve shapes.
•
W1(3) NEUTRAL 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) NEUTRAL 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.
GE Multilin
Courtesy of NationalSwitchgear.com
NEUTRAL OC
W1(3) NTRL TIME OC
ð
W1 NEUTRAL TIME OC
ENTER
FUNCTION: Enabled
ESCAPE
W1 NEUTRAL TIME OC
ESCAPE
TARGET: Latched
MESSAGE
W1 NEUTRAL TIME OC
ESCAPE
PICKUP: 0.85 x CT
MESSAGE
W1 NEUTRAL TIME OC
ESCAPE
SHAPE: Ext Inverse
MESSAGE
W1 NEUTRAL TIME OC
ESCAPE
MULTIPLIER: 1.00
MESSAGE
W1 NEUTRAL TIME OC
ESCAPE
RESET: Linear
MESSAGE
W1 NEUTRAL TIME OC
ESCAPE
BLOCK: Disabled
MESSAGE
Figure 5–17: NEUTRAL TOC SCHEME LOGIC
745 Transformer Management Relay
5.6 S4 ELEMENTS
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
5-57
Advertisement
Table of Contents
