Winding 1 (2/3) - GE 745 TRANSFORMER MANAGEMENT RELAY Instruction Manual

5 SETPOINTS
These sections describe the characteristics of each transformer winding and the CTs connected to them.
S WINDING 1
S [ENTER] for more
WINDING 1 NOM ø-ø
VOLTAGE: 220.0 kV
WINDING 1 RATED
LOAD: 100.0 MVA
WINDING 1 PHASE CT
PRIMARY: 500:5 A
WINDING 1 GROUND CT
PRIMARY: 500:5 A
WINDING 1 SERIES 3ø
RESISTANCE: 10.700 O
The above setpoint options are also available for the second and third winding. W3 setpoints are only
visible if the unit has the appropriate hardware and if the selected transformer type is 3-winding.
NOTE
GE Power Management
This message indicates the start of the WINDING 1 (2/3) section. To continue
with these setpoints press
section.
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 nominal phase-to-phase voltage rating of Winding 1 (2/3) of the
transformer. The range for this setpoint is affected by the setting made at
S2 SYSTEM SETUP/TRANSFORMER/LOW VOLTAGE WINDING RATING.
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 self-cooled load rating for Winding 1 (2/3) of the transformer. The
range for this setpoint is affected by the setting made at S2 SYSTEM SETUP/
TRANSFORMER/LOW VOLTAGE WINDING RATING.
Range: 1 to 50000 (steps of 1)
Enter the phase CT primary current rating of the current transformers
connected to Winding 1 (2/3). The CT secondary current rating must match
the relay phase current input rating indicated.
Range: 1 to 50000 (steps of 1)
Enter the ground CT primary current rating of the current transformers
connected in the Winding 1 (2/3) neutral to ground path. The CT secondary
current rating must match the relay ground current input rating indicated.
This message will only appear if the transformer type setpoint shows that
Winding 1 (2/3) is a wye-connected winding.
Range: 0.001 to 50.000 (steps of 0.001)
Enter the series three-phase resistance of the winding (i.e. the sum of the
resistance of each of the three phases for the winding). This value is
normally only available from the transformer manufacturer's test report, and
is used in the 745 for calculation of harmonic derating factor.
745 Transformer Management Relay
5.4 S2 SYSTEM SETUP

5.4.3 WINDING 1 (2/3)

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