Ground Overcurrent - GE Multilin 745 Instruction Manual

S4 Elements

Ground Overcurrent

! GROUND OC
! W1 GND
TIME OC
GE Multilin
a) Main Menu
PATH: SETPOINTS S4 ELEMENTS
!"
[!] ! W1 GND
! W2 GND
MESSAGE
! W3 GND
MESSAGE
! W1 GND
MESSAGE
! W2 GND
MESSAGE
! W3 GND
MESSAGE
! W1 GND
MESSAGE
! W2 GND
MESSAGE
! W3 GND
MESSAGE
In the 745, "ground" refers to the current measured in a CT in the connection
between the transformer neutral and ground. The 745 has two ground inputs which
are automatically assigned to wye or zig-zag connected windings, based on the
transformer type selected. As a result, only those ground overcurrent settings
whose winding is assigned a ground input are displayed and enabled. This section
contains the settings to configure the ground overcurrent elements. Included are
ground time overcurrents for each (wye or zig-zag) winding, and two levels of
ground instantaneous overcurrent for each (wye or zig-zag) winding.
b) Ground Time Overcurrent
PATH: SETPOINTS S4 ELEMENTS
!"
[!] W1 GROUND TIME OC
FUNCTION: Enabled
W1 GROUND TIME OC
MESSAGE
TARGET: Latched
W1 GROUND TIME OC
MESSAGE
PICKUP:
W1 GROUND TIME OC
MESSAGE
SHAPE: Ext Inverse
W1 GROUND TIME OC
MESSAGE
MULTIPLIER:
W1 GROUND TIME OC
MESSAGE
RESET: Linear
W1 GROUND TIME OC
MESSAGE
BLOCK: Disabled
• W1(3) GROUND TIME OC PICKUP: Enter the level of ground current (in units
of relay nominal current) above which the Winding 1(3) Ground Time
Overcurrent element will pickup and start timing.
http://www.GEindustrial.com/multilin
Transformer Management Relay
GROUND OC
!"
[!]
See page 5–59.
TIME OC
[!]
See page 5–59.
TIME OC
[!]
See page 5–59.
TIME OC
[!]
See page 5–60.
INST OC 1
[!]
See page 5–60.
INST OC 1
[!]
See page 5–60.
INST OC 1
[!]
See page 5–60.
INST OC 2
[!]
See page 5–60.
INST OC 2
[!]
See page 5–60.
INST OC 2
GROUND OC W1(3) GND TIME OC
!" !
Range: Enabled, Disabled
Range: Self-Reset, Latched, None
Range: 0.05 to 20.00 x CT in steps of
0.85 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
745
0.01
16, Output Rly 2 to 8, SelfTest
Rly, Vir Outpt 1 to 5, Disabled
5–59