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

Journal Article · Sun Jan 01 00:00:00 EST 1995 · IEEE Transactions on Power Delivery

DOI:https://doi.org/10.1109/61.368358· OSTI ID:40001

Walling, R A; Hartana, R K; Ros, W J ^[1]

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1. GE Industrial and Power Systems, Schenectady, NY (United States). Power Systems Engineering Dept.

Disconnecting one phase of an ungrounded-wye delta transformer bank from the source can result In severe overvoltages due to neutral shirt and ferroresonance. Neutral shirt 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.

• OSTI ID: 40001
• Report Number(s): CONF-9404175-; ISSN 0885-8977; TRN: IM9520%%196
• Journal Information: IEEE Transactions on Power Delivery, Vol. 10, Issue 1; Conference: Institute of Electrical and Electronics Engineers/Power Engineering Society (IEEE/PES) transmission and distribution conference, Chicago, IL (United States), 10-15 Apr 1994; Other Information: PBD: Jan 1995
• Country of Publication: United States
• Language: English

Related Subjects

24 POWER TRANSMISSION AND DISTRIBUTION
TRANSFORMERS
OVERVOLTAGE
POWER DISTRIBUTION SYSTEMS
VOLTAGE REGULATORS
SURGES
ELECTRICAL TRANSIENTS