Measurements of gas pressure in voids in epoxy castings for high voltage equipment

Esben Larsen, Mogens Henriksen, E Nielsen

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An investigation of samples of epoxy each containing one void, which were produced at different pressures, is reported. The samples were of the disk type with the void located in the center. The gas in the voids has a pressure somewhat related to the curing pressure, thereby directly influencing the partial-discharge inception voltage. Data show that gas pressure in voids in epoxy castings can be determined by use of an ultrasound test method. A relationship between the void gas pressure and the epoxy curing pressure is also found. This investigation is part of an effort to predict the inception voltage of partial discharges in high-voltage epoxy castings from the processing parameters
Original languageEnglish
JournalI E E E International Symposium on Electrical Insulation. Conference Record
Pages (from-to)372-375
Publication statusPublished - 1988
Event1988 IEEE International Symposium on Electrical Insulation - Boston, MA, United States
Duration: 5 Jun 19888 Jun 1988


Conference1988 IEEE International Symposium on Electrical Insulation
CountryUnited States
CityBoston, MA
Internet address

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