GE Multilin 745

S4 Elements
745
Transformer Management Relay
Setpoints
http://www.GEindustrial.com/multilin
5–61
GE Multilin
FIGURE 5–20: Ground Instantaneous Overcurrent Scheme Logic
Restricted Ground PATH: SETPOINTS !" S4 ELEMENTS !" RESTRICTED GROUND ! W1(3) RESTD GND FAULT
Restricted Ground Fault protection is often applied to transformers having
impedance grounded wye windings. It is intended to provide sensitive ground fault
detection for low magnitude fault currents which would not be detected by the
percent differential element.
FIGURE 5–21: Restricted Earth Ground Fault Protection
! W1 RESTD GND [!]
FAULT
W1 RESTD GND FAULT
FUNCTION: Disabled
Range: Enabled, Disabled
MESSAGE
W1 RESTD GND FAULT
TARGET: Latched
Range: Self-Reset, Latched, None
MESSAGE
W1 RESTD GND FAULT
PICKUP: 0.08 x CT
Range: 0.02 to 20.00 x CT in steps of
0.01
MESSAGE
W1 RESTD GND FAULT
SLOPE: 10%
Range: 0 to 100% in steps of 1
MESSAGE
W1 RESTD GND FAULT
DELAY: 0.10 s
Range: 0.00 to 600.00 s in steps of 0.01
MESSAGE
W1 NEUTRAL 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
87T
Rg
87TG