CHAPTER 5: SETTINGS SYSTEM SETUP
T35 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL 5-149
5
The aging acceleration factor is computed every minute. It has a value of 1.0 when the actual winding hottest spot
temperature is equal to the rated temperature, is greater than 1 if the actual temperature is above the rated temperature,
and less than 1 if the actual temperature is below the rated temperature.
NO LOAD LOSS — This setting is obtained from the transformer data and is used to calculate the aging acceleration factor.
TYPE OF COOLING — Defines the type of transformer cooling and is used to calculate the aging acceleration factor. The
values and their description for this setting are as follows:
“OA”: oil-air
“FA”: forced air
“Non-directed FOA/FOW”: non-directed forced-oil-air/forced-oil-water
“Directed FOA/FOW”: directed forced-oil-air/forced-oil-water
TOP OIL RISE OVER AMBIENT — Available from the transformer nameplate data
THERMAL CAPACITY — Available from the transformer nameplate data. If not, see the following calculations. For the “OA”
and “FA” cooling types:
C = 0.06 (core and coil assembly in lbs.) + 0.04 (tank and fittings in lbs.) +1.33 (gallons of oil), Wh/°C; or
C = 0.0272 (core and coil assembly in kg) + 0.01814 (tank and fittings in kg) + 5.034 (L of oil), Wh/°C
For the “Non-directed FOA/FOW” (non-directed forced-oil-air/forced-oil-water) or “Directed FOA/FOW” (directed forced-oil-
air/forced-oil-water) cooling types, the thermal capacity is given by:
C = 0.06 (core and coil assembly in lbs.) + 0.06 (tank and fittings in lbs.) + 1.93 (gallons of oil), Wh/°C; or
C =0.0272 (weight of core and coil assembly in kg) + 0.0272 (weight of tank and fittings in kg) + 7.305 (L of oil), Wh/°C
For dry-type power transformers:
C = 0.048 × (weight of copper winding); or
C = 0.015 × (weight of core and copper windings from the nameplate); or
C = 0.12 × (weight of aluminum windings); or
C = 0.02 × (weight of core and aluminum coils from the nameplate)
WINDING THERMAL TIME CONSTANT — Required for insulation aging calculation. If this value is not available from the
transformer data, select “2 min.”
5.5.4.3 Windings 1 to 6
SETTINGS SYSTEM SETUP TRANSFORMER WINDING 1(6)
Rated Winding
Temperature
Power Capacity Normal Life
Expectancy
At Θ
H_R
Oil 55 °C ≤ 500 kVA 180000 hrs 95 °C
≤ 100 MVA 6.5 × 10
4
hrs 95 °C
65 °C ≤ 500 kVA 20 years 110 °C
≤ 100 MVA 6.5 × 10
4
hrs 110 °C
> 100 MVA 6.5 × 10
4
hrs 110 °C
Dry 80 °C Any 20 years 140 °C
115 °C Any 20 years 175 °C
150 °C Any 20 years 210 °C
WINDING 1
WINDING 1 SOURCE:
SRC 1
Range: SRC 1, SRC 2, SRC 3, SRC 4, SRC 5, SRC 6
(or the user-defined name)
WINDING 1 RATED MVA:
100.000 MVA
Range: 0.001 to 2000.000 MVA in steps of 0.001
WINDING 1 NOM φ-φ
VOLTAGE: 220.000 kV
Range: 0.001 to 2000.000 kV in steps of 0.001
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