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# Transformer Riddle No.41 – Transformers bank capacity

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• #498
Saeed ahmed

How we can calculate the total power transformers capacity which are installed in parallel?
How we can calculate the total power transformers capacity which are installed in parallel?

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The power divides between parallel-connected transformers in a relationship which is inversely proportional to their impedances; a low-impedance transformer operated in parallel with a higher-impedance unit will pass the greater part of the power and may be overloaded. A mismatch in loading of up to 10 per cent is normally acceptable. For clarification please note to example below: Transformer 1 is thus overloaded by 20 % and transformer 3 by 6 %. Since the individual transformers should not be subjected to overload, the transformers may only assume a partial load such that the impedance voltage of each is uk = 4 %, as in the case with transformer 1. Therefore, If this output is not sufficient, another 160 kVA transformer with ukr = 4 % shall have to be installed.

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