Partial discharge Partial discharge In electrical engineering, partial discharge (PD) is a localized dielectric breakdown (DB) of a small portion of a solid or fluid electrical insulation (EI) system under high voltage (HV) stress, which does not bridge the space between two conductors. While a corona discharge (CD) is usually revealed by a relatively steady glow or brush discharge (BD) in air, partial discharges within solid insulation system are not visible. PD can occur in a gaseous, liquid or solid insulating medium. It often starts within gas voids, such as voids in solid epoxy insulation or bubbles in transformer oil. Protracted partial
Halo in a Haystack Halo in a Haystack Halo in a Haystack is the debut album by American metalcore band Converge, released in 1994 through Earthmaker Records. To fund the making of the record, vocalist Jacob Bannon saved up money from working at a nursing home. The record was released as a black vinyl and is not available in any other format. Only 1000 copies of this record were made and the record has not been reprinted since. However all of the record's tracks with the exception of the 9th track "Exhale" can be found on later Converge releases such as 1995's "Caring and