METHOD FOR DIAGNOSING LIFETIME OF POWER SWITCHING DEVICE, AND DIAGNOSIS SYSTEM AND DIAGNOSIS PROGRAM THEREFOR

摘要

PROBLEM TO BE SOLVED: To provide a method for diagnosing a lifetime of a power switching device in consideration of characteristics peculiar to the device.

SOLUTION: The method for diagnosing a lifetime of a power switching device determines a frequency of minute slides generated at a contact part of the power switching device on the basis of device-unique data 41 and operational environment data 42, determines the amount of decomposition products mixed into the contact part on the basis of the device-unique data 41 and interruption information data 43, calculates an abrasion loss due to the minute slides at the contact part on the basis of the frequency of minute slides and the amount of mixed decomposition products, and diagnoses the lifetime of the power switching device on the basis of the abrasion loss.

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