GE 745 - 5.4.3 Windings 1 to 3

5–36 745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
S2 SYSTEM SETUP CHAPTER 5: SETPOINTS
• 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.
5.4.3 Windings 1 to 3
PATH: SETPOINTS  S2 SYSTEM SETUP  WINDING 1(3)
These setpoints describe the characteristics of each transformer winding and the CTs
connected to them.
NOTE
Note
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
TRANSFORMER TYPE is a three-winding transformer.
• 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
S2
SYSTEM SETUP  TRANSFORMER  LOW VOLTAGE WINDING RATING setting (see table
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
S2 SYSTEM SETUP 
TRANSFORMER
 LOW VOLTAGE WINDING RATING setting (see the table below).
• 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.
 WINDING 1 [] WINDING 1 NOM Φ-Φ
VOLTAGE: 220.0 kV
Range: Dependent on LOW VOLTAGE
WINDING RATING; see below.
MESSAGE
WINDING 1 RATED
LOAD: 100.0 MVA
Range: Dependent on LOW VOLTAGE
WINDING RATING; see below.
MESSAGE
WINDING 1 PHASE CT
PRIMARY: 500:5 A
Range: 1 to 50000:5 A in steps of 1
MESSAGE
WINDING 1 GROUND CT
INPUT: NONE
Range: None, G1/2, G2/3
MESSAGE
WINDING 1 GROUND CT
PRIMARY: 2000:1 A
Range: 1 to 50000:1 A in steps of 1
MESSAGE
WINDING 1 SERIES 3Φ
RESISTANCE: 10.700 Ω
Range: 0.001 to 50.000 Ω in steps of
0.001
Setting Low voltage winding rating value
above 5 kV 1 kV to 5 kV below 1 kV
WINDING 1(3) NOM Φ-Φ
VOLTAGE
0.1 to 2000.0 kV in
steps of 0.1
0.01 to 200.00 kV in
steps of 0.01
0.001 to 20.000 kV
in steps of 0.001
WINDING 1(3) RATED
LOAD
0.1 to 2000.0 MVA
in steps of 0.1
0.01 to 200.00 MVA
in steps of 0.01
0.001 to 20.000
MVA in steps of
0.001