| 摘要 |
PROBLEM TO BE SOLVED: To non-destructively and easily perform insulation diagnosis by closely fitting a probe having a heater wire and a thermocouple to the part of a coil insulation layer, measuring the heat conduction of the coil insulation layer, and calculating the change of heat conduction. SOLUTION: A probe 6 having a heater wire 9 and a thermocouple 8 arranged on the surface of a highly heat insulating and elastic substrate 7 having a known heat conductivity is closely fitted to the flat part of a sample to measure the heat conductivity of the sample. The probe 6 is closely fitted to a coil end part or the surface of an insulation layer from above a wedge to measure the temperature rise, whereby the heat conduction is determined. As the measured heat conduction, the composite value of the insulation layer, the coil form and the like is measured. However, since it is limited to the insulation layer that the state of heat conduction is changed in the progress of deterioration, the change of heat conduction of the insulation layer is reflected to the change of the measured value. Accordingly, the deterioration degree of the insulation layer can be judged by performing relative comparison of the heat conduction accompanying the deterioration of the same kind and form.
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