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Browse Journals & Magazines > Power Delivery, IEEE Transact ...> Volume:14 Issue:4 Help

Overvoltages due to switching off an unloaded transformer with a vacuum circuit breaker

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2 Author(s)
Popov, M. ; Univ. St. Cyril & Methodious, Skopje, Macedonia ; Acha, E.

When a vacuum breaker is used to disconnect an unloaded transformer, high overvoltages may result on the secondary side. The phenomena of current chopping and multiple reignitions after contact opening, shortly before current zero, play a significant role in generating these overvoltages, Furthermore, the transient recovery voltage (TRV) is also influenced by virtual current chopping which may lead to fast interruptions and reignitions. The paper reports on a vacuum breaker model implemented in the ATP-EMTP program. Simulations have been performed to determine overvoltages generated by the vacuum breaker, before and after suppression. Network elements were simulated by simplified models of limited complexity

Published in:
Power Delivery, IEEE Transactions on  (Volume:14 ,  Issue: 4 )

Date of Publication: Oct 1999

Page(s):
1317 - 1326
ISSN :
0885-8977
INSPEC Accession Number:
6387204
Digital Object Identifier :
10.1109/61.796224
Product Type:
Journals & Magazines
Date of Current Version :
06 August 2002
Issue Date :
Oct 1999
Sponsored by :
IEEE Power & Energy Society

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