Tap Changer Failure - GE 745 TRANSFORMER MANAGEMENT RELAY Instruction Manual

5 SETPOINTS
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.
S TAP CHANGER FAILURE
S [ENTER] for more

TAP CHANGER FAILURE

FUNCTION: Disabled
TAP CHANGER FAILURE
TARGET: Self-reset
TAP CHANGER FAILURE
DELAY: 5.00 s
TAP CHANGER FAILURE
BLOCK: Disabled
GE Power Management
This message indicates the start of the TAP CHANGER FAILURE section. To
continue these setpoints press
Range: Disabled / Enabled
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.
Range: 0 to 600.00 (steps of 0.01)
Range: Disabled / Logc Inpt 1 (2-16) /Virt Inpt 1 (2-16) / Output Rly 1 (2-8) /
SelfTest Rly / Virt Outpt 1 (2-5)
745 Transformer Management Relay
5.6 S4 ELEMENTS
5.6.20 TAP CHANGER FAILURE
or press for the next section.
E N TE R M E SS AG E
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