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Can transformers be reverse connected?

April 26, 2017connected reverse transformers

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Can transformers be reverse connected?

2 Answers

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All dry type transformers can be reverse connected without a derating of KVA size, with certain limitations. All Sola/Hevi-Duty three-phase transformers, and all single-phase transformers rated at 1 KVA and above can be reverse connected without any loss in KVA rating. This is allowed due to the turns ratio and the voltage ratio being equal. Sola/Hevi-Duty does not recommend reverse connecting single phase transformers less than 1 KVA since the turns ratio compensation on the low voltage winding will provide voltages lower than name plate voltage. This voltage will be lower for lower KVA sizes.

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A. All dry type transformers can be reverse connected without a derating of KVA size, with certain limitations. All SolaHD three-phase transformers, and all single-phase transformers rated at 1 KVA and above can be reverse connected without any loss in KVA rating. This is allowed due to the turns ratio and the voltage ratio being equal. SolaHD does not recommend reverse connecting single phase transformers less than 1 KVA since the turns ratio compensation on the low voltage winding will provide voltages lower than name plate voltage.