Temperature effect on insulation resistance of generator stator bar affected by water ingress

For water-cooled stator bar of power generator, leaks of water at the copper strand brazing location will reduce dramatically its insulation resistance. Therefore, the insulation resistance measurement is an important and simple test to perform in the periodic maintenance program. The temperature ha...

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Bibliographic Details
Published in2015 IEEE Electrical Insulation Conference (EIC) pp. 515 - 518
Main Author Petit, Andre
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.08.2015
Subjects
Electrodes
generator
Generators
Insulation
insulation resistance
Resistance
stator bar
Temperature
Temperature dependence
Temperature measurement
water ingress
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Summary:For water-cooled stator bar of power generator, leaks of water at the copper strand brazing location will reduce dramatically its insulation resistance. Therefore, the insulation resistance measurement is an important and simple test to perform in the periodic maintenance program. The temperature has an important effect on the insulation resistance. To correctly trend the insulation resistance of the winding, a correction factor has to be applied. This paper describes experimental data performed on both dry and wet epoxy-mica insulation from bars removed from an operating generator. The results are compared with different correction models. They show an important difference of the temperature coefficient between the dry and wet bar.
ISBN:9781479973521
1479973521
ISSN:2334-0975
2576-6791
DOI:10.1109/ICACACT.2014.7223547