It is normal practice when designing electrical machines to design for operation within the maximum temperature limits of the insulation. If part of the winding is not effectively cooled under these conditions, the resulting temperature rise can damage the insulation and seriously reduce the length of operational service of the machine. This paper discusses a method of detecting high-temperature regions within a winding and of estimating the ‘hot spot’ temperature.
The investigation has been concentrated on the design associated with a direct water-cooled winding, although the results could be applied generally on other electrical machines.
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References
1.
JakobM.Heat transfer1959 (Wiley & Sons, Inc., New York).
2.
British Insulated Callenders Cables, Helsby, 1967. Private communication.
