GENERATOR TERMINAL BOX WITH MULTIPLE FLUX SHIELDING AND FORCED VENTILATION

摘要

17GE-2153 A terminal box for a dynamoelectric machine utilizes a flux shield system wherein a plurality of flux shields are interposed between the wall of the terminal box and a high voltage bushing. Cooling fluid is passed through the flux shield system to maintain all parts at a safe, low temperature. In one embodiment of the invention, a first inner flux shield member of high electrical conductivity and low magnetic permeability is spaced from but surrounding the bushing. A second outer flux shield member of low electrical conductivity and high magnetic permeability is spaced between the first shield member and the terminal box wall. Passages and openings are provided to allow cooling fluid to circulate over the respective shield members and the wall of the terminal box without providing a path for transmission of flux from the area surrounding the bushing to the terminal box wall. The fluid flow path and the suction ducts for removing coolant from the terminal box are arranged to insure maximum flow of cooling fluid over the most heated portions of the terminal box wall.