Title:
DETERIORATION-DEGREE JUDGMENT METHOD OF ELECTRIC APPARATUS FILLED WITH SYNTHETIC OIL
Document Type and Number:
Japanese Patent JP3018718
Kind Code:
B2
Abstract:
PURPOSE: To obtain a deterioration-degree judgment method wherein a local overheating temperature can be judged by analyzing a very small amount of a synthetic oil sample from an electric apparatus as an object to be diagnosed as will as the deterioration degree and the remaining life of a main material can be judged.
CONSTITUTION: A synthetic oil as a specimen is sample from an electric apparatus which is filled with the synthetic oil; a prescribed low-molecular-weight component in the synthetic oil as the specimen is analyzed quantitatively; the concentration ratio of each low-molecular-weight component to a specific low-molecular-weight component is found from an alalytical result which has been obtained. The concentration ratio is collated with a judgment curve which has been found in advance with reference to the synthetic oil of the same kind; a temperature in a heat-generating part at the inside of the electric apparatus is judged. When the synthetic oil is a silicone oil, only 3D out of low-molecular-weight components 3D, 4D, 5D, 6D displays a saturation characteristic. As a result, when the 3D is regarded as the specific low-molecular- weight component and the concentration ratio is found, a judgment curve having a pattern which is peculiar to the silicone oil can be obtained.
Inventors:
Takeshi Tsutsumi
Hironobu Naito
Motoo Wada
Hironobu Naito
Motoo Wada
Application Number:
JP4894992A
Publication Date:
March 13, 2000
Filing Date:
March 06, 1992
Export Citation:
Assignee:
Fuji Electric Co., Ltd.
International Classes:
G01N25/52; G01N33/26; H01F27/00; H02H5/04; (IPC1-7): G01N33/26; H01F27/00; H02H5/04
Attorney, Agent or Firm:
Masaharu Shinobe