# 3 phase load loss of YNyn0 transformer

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• #10602

the 3 phase power tansformer load loss measured by 3 wattmeter method. the total losses is sumation of w1+w2+w3=total losses

but as 3 kimbs of transformer is identical but w1 w2 w3 are not identical why this happens

#12445
#12524

There are always maunufacturing tolerances which will account for small differences between phases. If the differences are large then it is time to ask questions as there may be a problem with one winding.

#12530

Hi, I suppose you're measuring power loss with a balanced 3-phase load on the secondary side of the transformer.

How much is the transformer size and the load power? and the difference between W1 W2 and W3?  Can you give to us any numbers?

So we can evaluate, as correctly said by Smithy, if the difference is “on tollerance” or not.

#12540

A123 said:

the 3 phase power tansformer load loss measured by 3 wattmeter method. the total losses is sumation of w1+w2+w3=total losses

but as 3 kimbs of transformer is identical but w1 w2 w3 are not identical why this happens

Dear ;

You talk about the ” Copper Losses “, and we know that losse for each coil is : I² x R, that means the value is depending on 2 factors. Assume now that R has the same value for all coils ( it's 100% theoric ) the values for W1, W2, & W3 are depending on the circulated current in each coil, so, even if the currents are the same the R1, R2, R3 haven't 100% the same value.

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