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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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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cited_by cdi_FETCH-LOGICAL-c302t-64c393342ab2fc1f7ca12a1cc2b462b82ce85c76c5a81386c014e581466389eb3
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description 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.< >
doi_str_mv 10.1109/61.368358
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identifier ISSN: 0885-8977
ispartof IEEE transactions on power delivery, 1995-01, Vol.10 (1), p.526-533
issn 0885-8977
1937-4208
language eng
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source IEEE Xplore (Online service)
subjects Arresters
Capacitance
Circuit faults
Electrical equipment industry
Ferroresonance
Industrial power systems
Surges
Testing
Transformer cores
Windings
title Self-generated overvoltages due to open-phasing of ungrounded-wye delta transformer banks
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