Title:
CURRENT DIFFERENTIAL RELAY APPARATUS
Document Type and Number:
WIPO Patent Application WO/2012/001964
Kind Code:
A1
Abstract:
Provided is a current differential relay apparatus, wherein malfunctions of apparatuses are prevented by letting the relay continue the function thereof even when saturation of a current transformer occurs due to an internal accident. A ratio differential characteristic evaluation unit (14), which is for evaluating a ratio differential characteristic functioning on the basis of the amount of operation (Id) and the amount of inhibition (Ir), comprises: a first current-range evaluation unit (14-1) that evaluates, when a relationship of a1 ≤ a2 and b1 ≥ b2 holds true wherein a1, a2, b1, and b2 are real numbers, that a functioning thereof be implemented when Id > a1Ir + b1; a second current-range evaluation unit (14-2) that evaluates that a functioning thereof be implemented when Id > a2Ir + b2; and an AND operation unit (14-3), a reset unit (14-4), and a flip-flop unit (14-5) that evaluate that a ratio differential characteristic functioning be implemented when evaluations are made at both the first and second current ranges that functioning thereof be implemented, and makes the functioning thereof be continued until the functioning at the first range is reset.
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Inventors:
KASE, Takahiro (Toshiba Corporation 1-1, Shibaura 1-chome, Minato-k, Tokyo 01, 〒1058001, JP)
Application Number:
JP2011/003711
Publication Date:
January 05, 2012
Filing Date:
June 29, 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)
株式会社 東芝 (〒01 東京都港区芝浦一丁目１番１号 Tokyo, 〒1058001, JP)
International Classes:
H02H3/28
Attorney, Agent or Firm:
KIUCHI, Mitsuharu (5th Floor, Toranomon-Yoshiara Bldg. 6-13, Nishi-Shinbashi 1-chome, Minato-k, Tokyo 03, 〒1050003, JP)
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Claims: