| abstract |
A diagnosis method for oil-filled electrical equipment, for diagnosing a risk of occurrence of an abnormality caused by generation of copper sulfide on insulating paper, wherein a step 1 of conducting sulfidation corrosion evaluation of insulating oil in the oil-filled electrical equipment is performed, any one of a step 2 A- 1 of analyzing the insulating oil for presence of dibenzyldisulfide and an oxidative degradation preventing agent, a step 2 A- 2 of analyzing the insulating oil for presence of a copper sulfide generation inhibitor, and a step 2 B of checking presence of oxygen in an atmosphere of the insulating oil is performed, a step 3 of analyzing the insulating oil for presence of a byproduct derived when copper sulfide is generated from dibenzyldisulfide is performed, and a step 4 of diagnosing the risk of occurrence of an abnormality based on results of the steps 1, 2 A- 1, 2 A- 2 , and 3 is performed. |