GE Multilin 745

S4 Elements
745
Transformer Management Relay
Setpoints
http://www.GEindustrial.com/multilin
5–85
GE Multilin
Tap Changer Failure PATH: SETPOINTS !" S4 ELEMENTS !" TAP CHANGR FAILURE
The Tap Changer Failure element monitors the resistance seen by the tap changer
monitoring circuit. The element produces an output signal when the tap changer
position exceeds the maximum number of taps (set by the
NUMBER OF TAP POSITIONS
setpoint) by 2. This signal can be used as an alarm or as a signal to change the
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 compensate the input
current magnitude.
FIGURE 5–45: Tap Changer Failure Scheme Logic
! TAP CHANGR [!]
FAILURE
TAP CHANGER FAILURE
FUNCTION: Disabled
Range: Enabled, Disabled
MESSAGE
TAP CHANGER FAILURE
TARGET: Self-Reset
Range: Self-Reset, Latched, None
MESSAGE
TAP CHANGER FAILURE
DELAY: 5.00 s
Range: 0.00 to 600.00 s in steps of 0.01
MESSAGE
TAP CHANGER FAILURE
BLOCK: Disabled
Range: Logc Inpt 1 to 16, Virt Inpt 1 to
16, Output Rly 2 to 8, SelfTest
Rly, Vir Outpt 1 to 5, Disabled