Partial Discharge Inception and Breakdown Studies on Model Sheet-Wound, Compressed Sf6 Gas-Impregnated Polymer Film-Insulated Windings

Partial Discharge and Breakdown Studies in Model Gas Transformer Windings

“…Department of Energy Report, 1980) is the very efficient space utilization in the winding construction, comprised of: sheet conductor (aluminum foil) , polymer film insulation (Mylai>S) film) , and pressurized SF^ gas (impregnating the film-foil structure). Previous published studies (Reed andco-workers, 1980, 1981) on the 60 Hz partial discharge and breakdown performance of small model wind ings built with this construction have 1) verified the feasibility of using multiple samples wound concentrically upon one another and separated by a buffer padbreakdown had no effect upon adjacent samples -, 2) examined the effect of conduc tor edge conditioning, polymer film thickness, and gas pressure. The present report is a continuation of this work using small capacitor-like models.…”

“…The pressure vessel in which tests were conducted, assembly of the coils, prepara tions for testing, and the test procedure have been described previously (Reed andco-workers, 1980, 1981). All tests were carried out at an SF 6 gas pressure of 400 kPa using 60 Hz applied voltages.…”