5-36 745 Transformer Management Relay GE Power Management
5.4 S2 SYSTEM SETUP 5 SETPOINTS
5
5.4.4 ONLOAD TAP CHANGER
This section contains the settings to configure the tap position input. The 745 accepts a resistive input from the
tap changer control circuitry, which is used in the 745 to dynamically correct for CT ratio mismatch based on
the dynamically changing voltage ratio of the transformer. Thus, the percent differential function of the device
can be set for greater sensitivity. See the auto-configuration section of this chapter for more details on the tap
position input.
y ONLOAD TAP CHANGER
y [ENTER] for more
This message indicates the start of the
ONLOAD TAP CHANGER
section. To
continue with these setpoints press , or press to go to the
next section.
WINDING WITH TAP
CHANGER: None
Range: None / Winding 1 / Winding 2 / Winding 3
Enter the winding with the tap changer. Enter 'None' for a transformer with
no onload tap changer, or to disable this feature.
NUMBER OF TAP
POSITIONS: 33
Range: 2 to 50 (steps of 1)
Enter the number of tap changer positions.
MINIMUM TAP POSITION
VOLTAGE: 61.0 kV
Range: above 5 kV: 0.1 to 2000.0 (steps of 0.1)
1 kV to 5 kV: 0.01 to 200.00 (steps of 0.01)
below 1 kV: 0.001 to 20.000 (steps of 0.001)
Enter the voltage at the lowest tap position. The range is affected by the
S2 SYSTEM SETUP/TRANSFORMER/LOW VOLTAGE WINDING RATING
setpoint.
VOLTAGE INCREMENT
PER TAP: 0.50 kV
Range: above 5 kV 0.1 to 2000.0 (steps of 0.1)
1 kV to 5 kV 0.01 to 200.00 (steps of 0.01)
below 1 kV 0.001 to 20.000 (steps of 0.001)
Enter the voltage increment for each tap. The range is affected by the
S2 SYSTEM SETUP/TRANSFORMER/LOW VOLTAGE WINDING RATING
setpoint.
RESISTANCE INCREMENT
PER TAP: 33
Ω
Range: 10 to 500 (steps of 1)
Enter the resistance increment that the 745 will see for each tap increment.
Maximum value resistance on top tap is 5 K
Ω
ENTER
MESSAGE
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