Restricted Ground (Differential Ground); Winding 1 (2/3) Restricted Ground Fault - GE 745 TRANSFORMER MANAGEMENT RELAY Instruction Manual

5 SETPOINTS
S RESTRICTED GROUND
S [ENTER] for more
a) WINDING 1 (2/3) RESTRICTED GROUND FAULT
This section contains the settings to configure the restricted ground fault elements.
Figure 5–9: RESTRICTED EARTH GROUND FAULT PROTECTION
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 5–10: RESISTANCE GROUNDED WYE WINDING
GE Power Management

5.6.9 RESTRICTED GROUND (DIFFERENTIAL GROUND)

This message indicates the start of the RESTRICTED GROUND section. To
continue with these setpoints press
next section.
Delta Winding
I
P
Impedance grounded
wye winding
745 Transformer Management Relay
, or press
E N TE R
87T 87T
Rg Rg
87TG 87TG
Wye Winding
FAULT
I
F
5.6 S4 ELEMENTS
to go to the
M E SSA G E
5
5-59