Thermal characteristics for a 735 MVA 300 kV +7% to -18% / 23 kV ODWF cooled generator transformer
Specification Value
Load losses at nominal tap 1580 kW
Load losses at maximum current tap 1963 kW
Oil time constant 2.15 hr
Oil exponent 1.0
Top Oil rise over ambient temperature at rated load 33.4 K
Winding time constant at Hotspot location 14 mins
Winding hottest spot rise over Top Oil temperature at rated load 30.2 K
Winding exponent 2.0
Note:
OD (oil dir
ected) indicates that oil from heat exchangers (radiators) is forced through the windings. WF (Water Forced) states
that the oil is externally cooled by pumped water.
Thermal characteristics for a 600 MVA 432/23.5 kV ODWF cooled generator transformer
Specification Value
No load losses (core losses) 237 kW
Load losses at nominal tap 1423 kW
Load losses at maximum current tap 1676 kW
Oil time constant 2.2 hr
Oil exponent 1.0
Top Oil rise over ambient temperature at rated load 46.6 K
Winding time constant at Hotspot location 9 mins
Winding hottest spot rise over Top Oil temperature at rated load 33.1K
Winding exponent 2.0
Thermal characteristics for a IEC 60354 figures based on medium-large power transformers OD cooled
Specification Value
Oil time constant 1.5 hr
Oil exponent 1.0
Top Oil rise over ambient temperature at rated load 49 K
Winding time constant at Hotspot location 5-10 mins
Winding hottest spot rise over Top Oil temperature at rated load 29 K
Winding exponent 2.0
P64x Chapter 7 - Transformer Condition Monitoring
P64x-TM-EN-1.3 149
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