When a Transformer is operated under ANSI / IEEE basic loading conditions (ANSI C57.96), its normal life

expectancy is about 20 years. The ANSI / IEEE basic loading conditions for Transformer are:

expectancy is about 20 years. The ANSI / IEEE basic loading conditions for Transformer are:

**i. The Transformer is continuously loaded at rated kVA (kilo Volt Ampere) and rated Voltages (Transformer must be operated at the rated Voltage and kVA)**

**ii. The average temperature of the ambient air during any 24-hour period is equal to 30°C (86 °F) and at no time exceeds 40°C (104 °F).**

**iii. The height where the transformer is installed,**

does not above 3300 feet or 1000 meters.does not above 3300 feet or 1000 meters.

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is only these three is everthing given in ansi c56.96?

These were important..therefore, i shared with you folks..

Dear Sir,

I am working as a electrical engineer at Qatar.I would like to know about the 11 KV/2500 KVA transformer life expectancy calculation formula.

Waiting for your favorable reply

Thanks & Regards,

Xavier A

I am Engineer Tor-ue, working in Nigeria. pls i need the formular for the calculation of life expectant of a transformer

i need the formula for calculating transformer life expectancy ratio.