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

Conference · Sat Dec 31 00:00:00 EST 1994

OSTI ID:152865

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 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.

• OSTI ID: 152865
• Report Number(s): CONF-9404175-; ISBN 0-7803-1883-8; TRN: IM9602%%98
• Resource Relation: 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: 1994; Related Information: Is Part Of 1994 IEEE Power Engineering Society transmission and distribution conference: Proceedings; PB: 693 p.
• Country of Publication: United States
• Language: English

Related Subjects

24 POWER TRANSMISSION AND DISTRIBUTION
TRANSFORMERS
OVERVOLTAGE
POWER DISTRIBUTION SYSTEMS
OPERATION
SYSTEMS ANALYSIS