ESTIMATION METHOD OF GENERATION CONDITION OF ORGANIC COPPER COMPOUND AND COPPER SULFIDE IN OIL-FILLED CABLE BY ANALYSIS OF INSULATION OIL AND DIAGNOSTIC METHOD OF RISK OF ABNORMALITY GENERATION OF OIL-FILLED CABLE

摘要

PROBLEM TO BE SOLVED: To provide a diagnostic method for evaluating a risk of abnormality generation of an oil-filled cable by estimating generating conditions of organic copper compound and copper sulfide in the oil-filled cable using an insulation oil based on the generating conditions of the organic copper compound and copper sulfide estimated by the method.;SOLUTION: An oil-filled cable using an insulation oil includes: a step 1 of preparing a trend graph showing a variation with time of at least one of an oil-in melting copper amount, a dielectric loss tangent (tanδ), and the variation with time of a total amount (TOG) of combustible gas with respect to an insulation oil collected from the cable; a step 2 of obtaining a maximum oil-in melting copper amount based on a measurement value obtained by the step 1; a step 3 of obtaining a reduction amount from the maximum oil-in melting copper amount obtained by the step 2; and a step 4 of obtaining a ratio of tan δ to the oil-in melting copper amount. Generation conditions of the organic copper compound and the sulfur compound are estimated from the maximum oil-in melting copper amount, a maximum value of TCG, the reduction amount from the maximum oil-in melting copper amount and the ratio of tanδ to the oil-in melting copper amount.;SELECTED DRAWING: Figure 5;COPYRIGHT: (C)2018,JPO&INPIT