GE 745 TRANSFORMER MANAGEMENT RELAY User Manual

GE Power Management 745 Transformer Management Relay 5-79
5 SETPOINTS 5.6 S4 ELEMENTS
5
5.6.20 TAP CHANGER FAILURE
The Tap Changer Failure element monitors the resistance seen by the tap changer monitoring circuit. Should
the resistance be greater than 150% of the resistance at the maximum tap, per the settings of the Tap Changer
Monitoring feature, this element will produce an output signal. This signal can be used as an alarm or as a sig-
nal to change Setpoint Group. A change in the Setpoint Group would be programmed through the FlexLogic.
This approach would be useful if very sensitive settings had been used in the normal in-service Setpoint group
for the Harmonic Restrained Differential element, assuming that the tap changer position was used to compen-
sate the input current magnitude.
y TAP CHANGER FAILURE
y
[ENTER] for more
This message indicates the start of the
TAP CHANGER FAILURE
section. To
continue these setpoints press or press for the next section.
TAP CHANGER FAILURE
FUNCTION: Disabled
Range: Disabled / Enabled
TAP CHANGER FAILURE
TARGET: Self-reset
Range: Self-reset / Latched / None
Select
None
to inhibit the display of the target message when the element
operates. Thus an element whose “target type” is
None
never disables the
LED self-test feature since it cannot generate a displayable target message.
TAP CHANGER FAILURE
DELAY: 5.00 s
Range: 0 to 600.00 (steps of 0.01)
TAP CHANGER FAILURE
BLOCK: Disabled
Range: Disabled / Logc Inpt 1 (2-16) /Virt Inpt 1 (2-16) / Output Rly 1 (2-8) /
SelfTest Rly / Virt Outpt 1 (2-5)
ENTER
MESSAGE

GE 745 TRANSFORMER MANAGEMENT RELAY Specifications

General

Brand	GE
Model	745 TRANSFORMER MANAGEMENT RELAY
Category	Relays
Language	English