Frequently Asked Questions
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Question: Paralleling Transformers
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Answer: Transformers can be paralleled when their voltages are equal. If the voltages are not equal, the difference between the voltages will result in a net voltage which will cause current to circulate on the closed network between the two transformers. This will cause false loading and, if there is enough difference between the two voltages, the transformers may actually burn out without any useful load being connected to them. In order to have transformers with like voltages share the load proportionately, their impedance's must be similar. In most commercial installations a tolerance of 10% impedance is permissible when transformers are paralleled. Three phase transformers must have similar angular displacement, meaning the phasing must be the same on each transformer. |
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