GE 745 Instruction Manual page 132

S2 SYSTEM SETUP
5.4.3 Windings 1 to 3
 WINDING 1
Note
NOTE
5–36
• WINDING TIME CONST: Required for insulation aging calculations
• SET ACCUMULATED LOSS OF LIFE: Required for insulation aging calculations. Set
equal to the estimated accumulated loss of life.
PATH: SETPOINTS
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These setpoints describe the characteristics of each transformer winding and the CTs
connected to them.
The above setpoint options are also available for the second and third winding. Winding 3
setpoints are only visible if the unit has the appropriate hardware and if the selected
is a three-winding transformer.
TRANSFORMER TYPE
WINDING 1(3) NOM Φ−Φ VOLTAGE: Enter the nominal phase-to-phase voltage rating
•
of Winding 1(3) of the transformer. The range for this setpoint is affected by the
SYSTEM SETUP

below).
• WINDING 1(3) RATED LOAD: Enter the self-cooled load rating for winding 1(3) of the
transformer. The range for this setpoint is affected by the
TRANSFORMER

Setting
WINDING 1(3) NOM Φ-Φ
VOLTAGE
WINDING 1(3) RATED
LOAD
• WINDING 1(3) PHASE CT PRIMARY: Enter the phase CT primary current rating of the
current transformers connected to winding 1(3). The CT secondary current rating must
match the relay phase current input rating indicated.
• WINDING 1(3) GROUND INPUT SELECTION: Select the ground CT (G1/2 or G2/3) for
the particular winding required. Leave ground CT selection at default value of "None" if
no CT is needed on the required winding.
The ground input selection settings will be defaulted to "None" when an upgrade
settings file is uploaded.
S2 SYSTEM SETUP WINDING 1(3)

WINDING 1 NOM Φ-Φ
VOLTAGE: 220.0 kV
WINDING 1 RATED
LOAD: 100.0 MVA
WINDING 1 PHASE CT
PRIMARY: 500:5 A
WINDING 1 GROUND CT
INPUT: NONE
WINDING 1 GROUND CT
PRIMARY: 2000:1 A
WINDING 1 SERIES 3Φ
RESISTANCE: 10.700 Ω
TRANSFORMER LOW VOLTAGE WINDING RATING

LOW VOLTAGE WINDING RATING
Low voltage winding rating value
above 5 kV
0.1 to 2000.0 kV in
steps of 0.1
0.1 to 2000.0 MVA
in steps of 0.1
745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETPOINTS
Range: Dependent on LOW VOLTAGE
WINDING RATING; see below.
Range: Dependent on LOW VOLTAGE
WINDING RATING; see below.
Range: 1 to 50000:5 A in steps of 1
Range: None, G1/2, G2/3
Range: 1 to 50000:1 A in steps of 1
Range: 0.001 to 50.000 Ω in steps of
0.001
setting (see table
S2 SYSTEM SETUP
setting (see the table below).
1 kV to 5 kV below 1 kV
0.01 to 200.00 kV in 0.001 to 20.000 kV
steps of 0.01 in steps of 0.001
0.01 to 200.00 MVA 0.001 to 20.000
in steps of 0.01 MVA in steps of
0.001
S2
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