LEAKAGE CURRENT DETERMINING APPARATUS AND LEAKAGE CURRENT DETERMINING METHOD

WIPO Patent Application WO/2008/069249

A1

To determine a leakage current (Igr) caused by a resistor providing insulation to the earth. A CT sensor part (10) determines a leakage current (I) flowing through an electric path (A) to be checked. The determined leakage current (I) is then converted to a voltage. A phase angle calculating part (22) determines, based on the converted voltage (V1) and a voltage (V2) determined from the voltage path of the to-be-checked electric path (A), a phase angle (θ) of the leakage current (I) flowing through the to-be-checked electric path (A). A leakage current calculating part (27) calculates only the leakage current (Igr), which is caused by the resistor providing insulation to the earth, from the phase angle (θ) and leakage current (I) on the basis of a predetermined condition (a first or second condition) in accordance with the electric system and balanced or unbalanced state of the to-be-checked electric path (A). First Condition: Igr = I0 Œcos θ Second Condition: Igr = (I0 Œ sin θ1)/cos θ2

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ATOJI TOYOTSUGU (JP)
KASHIRAMOTO YORIKAZU (JP)

PCT/JP2007/073520

June 12, 2008

December 05, 2007

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OHNO TAKEMI (JP)
ATOJI TOYOTSUGU (JP)
KASHIRAMOTO YORIKAZU (JP)

G01R31/02

WO2006035519A1

2006-04-06

JP2005140532A	2005-06-02
JP2006038604A	2006-02-09
JP2004012147A	2004-01-15
JPH0729477U	1995-06-02
JP2002125313A	2002-04-26
JP2005062124A	2005-03-10
JPH0919046A	1997-01-17

SHOBAYASHI, Masayuki (25-8Higashi-ikebukuro 1-chome,Toshima-k, Tokyo 13, JP)

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