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
Marketing of Halo 3 on the gaming community to spread the word itself. The focus on traditional media would help expand the fan base beyond established gamers and convince the public that the game was a cultural milestone. To build public interest, Microsoft made public statements that "Halo 3" would surpass media sales records, including the July 2007 record of $166 million set by the launch of "Harry Potter and the Deathly Hallows". Microsoft's target was to sell 1.5 million copies of the game. Marketing research suggested that the ""Halo" faithful" could only be counted on to buy 75% of that amount, meaning that