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The system and transformer characteristics which can result in overvoltages and ferroresonance when energizing grounded-wye/ grounded-wye distribution transformers from a remote location with single-pole switches are defined. A qualitative analysis of a system typical of those installed today is presented to show how the overvoltages can occur during single-pole switching. Full-scale laboratory tests were conducted to determine maximum overvoltages and obtain a better understanding of the phenomenon. The results show that distinct responses occur during the single-pole energization, and ferroresonance can occur contrary to statements appearing in many references.
Smith et al. (Mon,) studied this question.
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