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Sadanand Jadaye
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Join Date: Nov 2008
Posts: 13

Distribution Transformer - Maximum Safe Working Temperature

02/23/2009 5:17 AM

What is the maximum safe working temperature (for oil/Winding) of a distribution transformer of 500 KVA, 22000/433 Volts, which is loaded about 85%. It is used in outdoor environment.
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Bluestone
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Join Date: Nov 2006
Location: OH USA
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#1

Re: Distribution Transformer - Maximum Safe Working Temperature

02/23/2009 11:56 AM

If you are a user, the maximum safe working temperature is listed on the nameplate. That temperature will likely be shown as a rise temperature; meaning ______°C rise (over ambient). That will typically be 65°C over 40°C for conventional oil-filled transformers.
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ANANDAN
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Join Date: Dec 2008
Posts: 12
#2

Re: Distribution Transformer - Maximum Safe Working Temperature

02/23/2009 11:13 PM

NORMALLY TRANSFORMERS WILL BE CLASS A INSULATION.THAT IS 105 DEG C. HENCE GO FOR A WINDING TEMP OF MAX 90 DEG C, CONSIDERING THAT WTI has allways some error.

REG

E ANANDAN
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