Patent ID: 7491885
Filing Date: 2009-02-17
Classification: H02G

Abstract:
1. A polymer bushing comprising: a hard insulation sleeve extending along a longitudinal axis from an upper distal end to a lower end and surrounding and molded integrally with a central conductor bar extending along the longitudinal axis; a receiving port, for receiving a stress cone of a cable terminal, in the lower end of the hard insulation sleeve; an electric-field stress-control layer surrounding the insulation sleeve; a polymer cladding disposed around an outer periphery of the stress-control layer, extending from a lower end thereof to the upper distal end of the hard insulation sleeve, and having a plurality of longitudinally spaced shades on its outer periphery; an annular metal fitting concentric with the conductor bar and embedded in and fixed to the hard insulating sleeve, the annular metal fitting including a flange located at a position longitudinally between the lower end of the polymer cladding and the receiving port; and wherein the electric-field stress-control layer is disposed at an interface between the hard insulation sleeve and the polymer cladding, is in contact with the annular metal fitting and extends longitudinally from the annular metal fitting toward the upper distal end of the hard insulating sleeve.