Dielectric breakdown strength correlation with time-to-failureduring wet aging of XLPE-insulated cables

摘要

This paper reviews two sets of failure information, the GMTF (anparameter obtained from time-to-failure results) and GMBD stress (anparameter that is calculated from AC breakdown test results), andnsuggests a correlation. The test results were obtained from acceleratednaging experiments on full-sized medium voltage cables in carefullyncontrolled and monitored water-filled tanks. Results show that thenambient temperature AC breakdown strength for equivalently aged cablesnis influenced primarily by voltage stress during aging-not by the agingntemperature. The AC breakdown strength on equivalently aged cables wasnalso shown to decrease with reductions in the aging voltage at all agingntemperatures