Transformer Specifications

[Markr]

When a transformer manufacturer states full load and no load losses for a transformer does the full load loss number contain both copper and core losses such that you can subtract the no load loss from the full load loss to get the copper loss .

I'm wondering what the industry standard is for these designations.

 

[RRaghunath]

Markr,

If you look at the test report, you would notice that full load loss measurement is done not at therated voltage at the transformer terminals, whereas, the no-load test is measured at rated voltage. Thus, the full load loss measurement is not at rated magnetic flux and hence, doesn't include rated excitation loss figure.

The voltage applied during full load loss test is equal to the %Impedance Volts times the rated transformer voltage and thus full load loss is essentially copper loss and the no-load loss measurement provides informtion essentially on magnetisation losses.

Trust you find the above useful. Raghunath

 

[busbar]

In ANSI regions, see IEEE Std C57.12.90-1993 {nota bene §8&9} for oil-insulated devices.

Description ONLY of standard at standards.ieee.org/reading/ieee/std_public/description/dtransformers/C57.12.90-1993_desc.html

 

[jghrist]

The full-load losses are only the copper losses. No-load losses are only the core losses.