Large synchronous motors for the Delaware City Repowering Project

The successful and profitable operation of a petroleum coke gasification pr oject relies very heavily on a reliable source of oxygen produced from an a ir separation unit (ASU). The ASU for the Motiva Delaware City Repowering P roject depends upon the proper application and operation of very large sync hronous motors, including a four-pole 66000-hp machine and a four-pole 4300 0-hp machine, the former being the largest 1800-r/min compressor driver eve r designed and manufactured. Specification development and supplier selecti on are summarized. The effects of motor starting on the power system with r egard to voltage drop will be outlined and discussed. Motor design issues r elating to transient temperatures and stresses as well as torsional and lat eral critical speeds are analyzed. Factory and commissioning test procedure s that verify the motor electrical design, mechanical design, and performan ce are discussed.