HIGH-VOLTAGE INSULATOR

A high-voltage insulator includes a power unit that comprises an insulating fiberglass rod, ends of which being connected by metal end terminals. Each end terminal includes a basis part with, in substance, outer cylindrical surface. In butt-end of the said basis part at least one of end terminal it is made an axial reaming, in which corresponding rod end is pressurized. The wall formed by the said, in substance, outer cylindrical surface of end terminals and inner surface of the axis reaming, has thickness D, butt-end of end terminal from the direction of the axial reaming is connected with the said surface that has radius R. Insulator has unit-cast protective shell with ring ribs, which covers the power unit and has extension with length H along the power unit. The distance between said butt-end surfaces of terminations is equal h. Protective shell is made of vulcanized polymeric compound on the basis of liquid rubbers. Oligomers of it contain end functional groups, the said radius R is situated within limits of 0,5D ( R ( 2D. Length of protective shell H lies within limits of h