GE 745 TRANSFORMER MANAGEMENT RELAY User Manual

GE Power Management 745 Transformer Management Relay 5-59
5 SETPOINTS 5.6 S4 ELEMENTS
5
5.6.9 RESTRICTED GROUND (DIFFERENTIAL GROUND)
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
y RESTRICTED GROUND
y
[ENTER] for more
This message indicates the start of the
RESTRICTED GROUND
section. To
continue with these setpoints press , or press to go to the
next section.
ENTER
MESSAGE
87T87T
87TG87TG
RgRg
Wye Winding
FAULT
IF
Delta Winding
IP
Impedance grounded
wye winding

GE 745 TRANSFORMER MANAGEMENT RELAY Specifications

General

Brand	GE
Model	745 TRANSFORMER MANAGEMENT RELAY
Category	Relays
Language	English