Restricted Ground - GE Multilin 745 Instruction Manual

S4 Elements

Restricted Ground

! W1 RESTD GND
FAULT
GE Multilin
FIGURE 5–20: Ground Instantaneous Overcurrent Scheme Logic
PATH: SETPOINTS S4 ELEMENTS
!"
[!] W1 RESTD GND FAULT
FUNCTION: Disabled
W1 RESTD GND FAULT
MESSAGE
TARGET: Latched
W1 RESTD GND FAULT
MESSAGE
PICKUP:
W1 RESTD GND FAULT
MESSAGE
SLOPE:
W1 RESTD GND FAULT
MESSAGE
DELAY:
W1 NEUTRAL TIME OC
MESSAGE
BLOCK: Disabled
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
http://www.GEindustrial.com/multilin
Transformer Management Relay
RESTRICTED GROUND W1(3) RESTD GND FAULT
!" !
Range: Enabled, Disabled
Range: Self-Reset, Latched, None
Range: 0.02 to 20.00 x CT in steps of
0.08 x CT
Range: 0 to 100% in steps of 1
10%
Range: 0.00 to 600.00 s in steps of 0.01
0.10 s
Range: Logc Inpt 1 to 16, Virt Inpt 1 to
87T
Rg
87TG
745
0.01
16, Output Rly 2 to 8, SelfTest
Rly, Vir Outpt 1 to 5, Disabled
5–61