GE Multilin 745

S4 Elements
745
Transformer Management Relay
Setpoints
http://www.GEindustrial.com/multilin
5–59
GE Multilin
Ground Overcurrent a) Main Menu
PATH: SETPOINTS !" S4 ELEMENTS !" GROUND OC
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 !" GROUND OC ! W1(3) GND TIME OC
• 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.
! GROUND OC [!] ! W1 GND [!]
TIME OC
See page 5–59.
MESSAGE
! W2 GND [!]
TIME OC
See page 5–59.
MESSAGE
! W3 GND [!]
TIME OC
See page 5–59.
MESSAGE
! W1 GND [!]
INST OC 1
See page 5–60.
MESSAGE
! W2 GND [!]
INST OC 1
See page 5–60.
MESSAGE
! W3 GND [!]
INST OC 1
See page 5–60.
MESSAGE
! W1 GND [!]
INST OC 2
See page 5–60.
MESSAGE
! W2 GND [!]
INST OC 2
See page 5–60.
MESSAGE
! W3 GND [!]
INST OC 2
See page 5–60.
! W1 GND [!]
TIME OC
W1 GROUND TIME OC
FUNCTION: Enabled
Range: Enabled, Disabled
MESSAGE
W1 GROUND TIME OC
TARGET: Latched
Range: Self-Reset, Latched, None
MESSAGE
W1 GROUND TIME OC
PICKUP: 0.85 x CT
Range: 0.05 to 20.00 x CT in steps of
0.01
MESSAGE
W1 GROUND TIME OC
SHAPE: Ext Inverse
Range: see description below
MESSAGE
W1 GROUND TIME OC
MULTIPLIER: 1.00
Range: 0.00 to 100.00 in steps of 0.01
MESSAGE
W1 GROUND TIME OC
RESET: Linear
Range: Instantaneous, Linear
MESSAGE
W1 GROUND 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