MAGNETIZING INRUSH CURRENT SUPPRESSING DEVICE

Title:

MAGNETIZING INRUSH CURRENT SUPPRESSING DEVICE

Document Type and Number:

WIPO Patent Application WO/2013/038919

Kind Code:

A1

Abstract:

A magnetizing inrush current suppressing device (6) for controlling a breaker (2) that opens and closes connection of a transformer (3), which includes a Y-connected primary winding (301) and secondary wiring (302) and a Δ connected tertiary winding (303), and a power supply bus conductor (1) so as to suppress the magnetizing inrush current, wherein a three-phase AC voltage of the power supply bus conductor (1) is measured, steady magnetic fluxes among the three lines of the tertiary winding (303) are calculated, each terminal voltage of the tertiary winding (303) of the transformer (3) is measured, residual magnetic fluxes among the three lines of the tertiary winding (303) are calculated, and the breaker (2) is input simultaneously in three phases at an input target phase, at which the magnetizing inrush current is suppressed, of the phases at which the steady magnetic flux and the residual magnetic flux match between the lines of the residual magnetic fluxes having the smallest absolute value of the residual magnetic fluxes among the three lines.

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Inventors:

KOSHIZUKA TADASHI (JP)
SAITO MINORU (JP)
MARUYAMA SHIRO (JP)
MAEHARA HIROYUKI (JP)
SUZUKI KOJI (JP)

Application Number:

PCT/JP2012/072045

Publication Date:

March 21, 2013

Filing Date:

August 30, 2012

Export Citation:

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Assignee:

TOSHIBA KK (JP)
KOSHIZUKA TADASHI (JP)
SAITO MINORU (JP)
MARUYAMA SHIRO (JP)
MAEHARA HIROYUKI (JP)
SUZUKI KOJI (JP)

International Classes:

H01H33/59; H01H9/56; H01H33/44; H02H7/045

Domestic Patent References:

WO2011086671A1	2011-07-21
WO2008065757A1	2008-06-05

Foreign References:

JP2011154974A	2011-08-11
JP2010073666A	2010-04-02

Attorney, Agent or Firm:

KURATA, Masatoshi et al. (JP)
Masatoshi Kurata (JP)

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Claims:

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