METHOD FOR DIAGNOSING OIL-FILLED ELECTRICAL APPARATUS, AND MAINTENANCE METHOD

WIPO Patent Application WO/2014/080451

A1

The present invention is a method for diagnosing an oil-filled electrical apparatus, for diagnosing the risk of an abnormality causing the formation of copper sulfide on insulating paper inside the oil-filled electrical apparatus, in which are performed: (1) a step (1) for evaluating sulfuration corrosivity of insulating oil inside the oil-filled electrical apparatus; (2) at least one of a step (2A-1) for analyzing the insulating oil for the presence of dibenzyl disulfide and an oxidative degradation inhibitor, a step (2A-2) for analyzing the insulating oil for the presence of a copper sulfide formation suppressing agent, and a step (2B) for confirming the presence of oxygen in the atmosphere of the insulating oil; (3) a step (3) for analyzing, as needed, the insulating oil for the presence of byproducts of the formation of copper sulfide from dibenzyl disulfide; and (4) a step (4) for diagnosing the degree of risk of the occurrence of an abnormality on the basis of the results of all the steps implemented among the steps (1, 2A-1, 2A-2, and 3).

KATO FUKUTARO (JP)
AMIMOTO TSUYOSHI (JP)
NISHIURA RYUICHI (JP)
TOYAMA SATORU (JP)
MIZUNO KOTA (JP)

PCT/JP2012/080053

May 30, 2014

November 20, 2012

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MITSUBISHI ELECTRIC CORP (JP)
KATO FUKUTARO (JP)
AMIMOTO TSUYOSHI (JP)
NISHIURA RYUICHI (JP)
TOYAMA SATORU (JP)
MIZUNO KOTA (JP)

H01F27/00; H01F41/00

WO2011080812A1	2011-07-07
WO2011152177A1	2011-12-08
WO2012081073A1	2012-06-21

JP2011165851A	2011-08-25
JP2012156232A	2012-08-16
JP4852186B1	2012-01-11

Fukami Patent Office, p. c. (JP)
Patent business corporation Fukami patent firm (JP)

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