Self-generated overvoltages due to open-phasing of ungrounded-wye delta transformer banks

Disconnecting one phase of an ungrounded-wye delta transformer bank from the source can result in severe overvoltages due to neutral shift and ferroresonance. Neutral shift overvoltages are quantified and their impact on metal-oxide surge arresters are evaluated. Ferroresonance is shown by test data...

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Bibliographic Details
Published in:IEEE transactions on power delivery 1995-01, Vol.10 (1), p.526-533
Main Authors: Walling, R.A., Hartana, R.K., Ros, W.J.
Format: Article
Language:English
Subjects:
Arresters
Capacitance
Circuit faults
Electrical equipment industry
Ferroresonance
Industrial power systems
Surges
Testing
Transformer cores
Windings
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Summary:Disconnecting one phase of an ungrounded-wye delta transformer bank from the source can result in severe overvoltages due to neutral shift and ferroresonance. Neutral shift overvoltages are quantified and their impact on metal-oxide surge arresters are evaluated. Ferroresonance is shown by test data to occur when low-loss banks, 15 kV and higher, are open phased. Design and operating practices to eliminate or mitigate these self-generated overvoltages are discussed.< >
ISSN:0885-8977
1937-4208
DOI:10.1109/61.368358