MV AND HV DISTRIBUTOR GEAR CONTACT UNIT AND ITS FABRICATION METHOD Russian patent published in 2013 - IPC H01H33/66 

FIELD: electrical engineering.

SUBSTANCE: according to the invention, a cylindrical-shaped thermoconductive heat-transfer element is used in the contact unit of a LV, MV or HV distributor switchgear which element is installed between the vacuum interrupter chamber, the contact base and the encapsulating shell. The inner surface of the heat-transfer element is positioned on or near the outer surface of the vacuum interrupter chamber and the contact base while the outr surface rests on the inner surface of the encapsulating shell. The heat-transfer element may be fabricated of a thermoconductive plastic by way of pressure casting, casting or moulding. Then it may be connected to the pole part through the holes. The next operation is installation of the heat-transfer element before the unit encapsulation with an encapsulating compound with their subsequent joint filling.

EFFECT: increase of the contact unit current load bearing capacity due to improved dispersion of heat generated therein through convection.

14 cl, 1 dwg