Improvement of Insulation Tests for Diagnosis of Traction Motors


Hiroshi HATA, Takashi MAEDA
Insulation breakdown is one of the biggest troubles of traction motors. Various kinds of insulation tests such as insulation resistance test, tan delta test, are carried out in the workshop with all the traction motors every 2 or 3 years. This time we improve 2 points about the tests. The first point is quantification of temperature and humidity effects in the results of insulation tests. And the second point is to check the validity of insulation tests by carring out insulation breakdown tests of many motors for the first time.