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Answer Posted / rman
its very cheap because you only need 2 transformers. but the total capacity of these 2 transformers cannot be used remembering that the rating of each transformer is multiplied by a factor of sqrt(3) which is only 1.73
i.e. two transformers rated at 50kVA to be open delta.
the total is 2(50kVA) which is 100kVA but the transformer can only carry 1.73(50kVA) which is only a total of 86.5kVA
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