Abstract: It is intended to achieve the weight reduction, sliming, and downsizing of bushings, compatibility of types of bushings, and simplification of operating steps. A polymer bushing comprises a conductor draw-out bar (1) having a conductor insertion hole (1a) in the lower end, a hard insulation sleeve (2) installed around the outer periphery of the conductor draw-out bar (1), a polymer clad body (3) installed around the outer periphery of the insulation sleeve (2), and an electric field stress-control layer installed on the interface between the insulation sleeve (2) and the polymer clad body (3). The insulation sleeve (2) comprises a large-diameter insulation sleeve (2a) installed around the outer periphery of the lower region of the conductor draw-out bar (1), and a small-diameter insulation sleeve (2b) installed around the outer periphery of a portion of the conductor draw-out bar (1) excluding the front end.

Abstract: A polymer jacket tube includes a conductor bar which has a conductor insertion hole at its lower end, a rigid insulation sleeve around the outer periphery of the conductor bar, and a polymer covering on the outer periphery of the insulation sleeve. The insulation sleeve includes a large-diameter insulation sleeve at the lower, outer peripheral portion of the conductor bar, and a small-diameter insulation sleeve surrounding the outer peripheral portion of the conductor bar except for the distal end thereof. An embedded metal fitting for electrical stress relief is buried in the continuous portion of the large-diameter insulation sleeve and the small-diameter insulation sleeve. A cone-shaped reception port receives the stress cone of a cable terminal and is located at the lower end of the large-diameter insulation sleeve, which reception port is in communication with the conductor insertion hole of the conductor.

Abstract: A polymer jacket tube includes a conductor bar 1 which has a conductor insertion hole 1a at its lower end part, a rigid insulation sleeve 2 which is provided at the outer periphery of the conductor bar 1, and a polymer covering 3 which is provided at the outer periphery of the insulation sleeve 2. The insulation sleeve 2 includes a large-diameter insulation sleeve 2a which is provided at the outer peripheral part of the lower portion of the conductor bar 1, and a small-diameter insulation sleeve 2b which is provided at the outer peripheral part of the portion of the conductor bar 1 except the distal end part thereof, and an embedded metal fitting 4 for electrical stress relief is buried in the continuous portion of the large-diameter insulation sleeve 2a and the small-diameter insulation sleeve 2b.