OUTDOOR HIGH-VOLTAGE CURRENT TRANSFORMER Russian patent published in 2001 - IPC

FIELD: instrument transformers for high- and superhigh-voltage circuits. SUBSTANCE: transformer has cylindrical insulating case secured on metal base through sealed joint that mounts metal case accommodating primary and secondary windings and is filled with insulating medium. Primary winding is made in the form of straight conductor arranged along axis of secondary winding with its ends secured to side walls of metal case. Secondary winding is wound on toroidal cores enclosed by toroidal electrostatic screen. The latter is fixed on upper end of supporting metal tube through which secondary winding taps are passed. Lower end of tube is secured on base perpendicular to secondary winding axis. Spring- loaded bellows is mounted perpendicular to primary winding axis in metal-case recess. It is closed with metal lid provided with threaded hole and set on sealing gasket. Bellows bottom is welded to its side wall and screwed to insulating mount that supports toroidal screen on its external side. Threaded hole of lid receives composite bolt mounted for rotation with its bottom end joined to bellows bottom, its top end being fixed to lid with aid of nuts. EFFECT: enhanced reliability, simplified design, facilitated manufacture. 4 dwg