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Large mill power outages caused by potential transformer ferroresonance

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2 Author(s)
Crane, D.R. ; Weyerhauser Paper Co., Columbus, MS, USA ; Walsh, G.W.

Investigative procedures relating to a subtle 30 Hz ferroresonant instability of high-voltage potential transformers, which has caused several costly power outages to a large paper mill are reported. Included are unusual field oscillograms of this instability. Corrective measures were developed which have been implemented. An alternate recommended approach is to be incorporated in a similar high-voltage supply to a new mill to eliminate this instability as a possible jeopardy to selective ground-relay protection

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Industry Applications, IEEE Transactions on  (Volume:24 ,  Issue: 4 )