Title:
PROTECTION RELAY APPARATUS
Document Type and Number:
WIPO Patent Application WO/2012/008170
Kind Code:
A1
Abstract:
This invention provides a protection relay (1) that protects the power transmission lines of a three-phase AC power system (20). In response to detection of a fault, the protection relay (1) opens a CB (4a) of the fault phase for which the fault has occurred. After opening the CB (4a), the protection relay (1) determines, on the basis of a voltage measurement value (VL) of the fault phase detected by a VT (3), whether the fault has been eliminated. If having determined that the fault has been eliminated, the protection relay (1) closes the CB (4a) again.
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Inventors:
OTOMO, Yu (())
大友 優 (())
大友 優 (())
Application Number:
JP2011/052395
Publication Date:
January 19, 2012
Filing Date:
February 04, 2011
Export Citation:
Assignee:
KABUSHIKI KAISHA TOSHIBA (1-1 Shibaura 1-chome, Minato-ku Tokyo, 01, 〒1058001, JP)
株式会社 東芝 (〒01 東京都港区芝浦一丁目１番１号 Tokyo, 〒1058001, JP)
OTOMO, Yu (())
株式会社 東芝 (〒01 東京都港区芝浦一丁目１番１号 Tokyo, 〒1058001, JP)
OTOMO, Yu (())
International Classes:
H02H3/06
Attorney, Agent or Firm:
KURATA, Masatoshi et al. (1-12-9 Toranomon, Minato-k, Tokyo 01, 〒1050001, JP)
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Claims:
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