公开(公告)号：US20180286540A1

公开(公告)日：2018-10-04

申请号：US15546060

申请日：2016-01-25

Applicant: SWCC SHOWA CABLE SYSTEMS CO., LTD.

Inventor： Tsutomu SUMIMOTO ,  Akihisa KUWAKI ,  Kazuhisa ADACHI

IPC: H01B17/30 ,  H01B17/42

CPC classification number: H01B17/303 ,  H01B17/26 ,  H01B17/42 ,  H01B17/525 ,  H02G3/22 ,  H02G15/064

Abstract: A polymer bushing includes: an inner conductor; a hard insulating tube; a shielding metal fitting; a polymer covering that includes a body part that covers an outer periphery of the insulating tube, and a plurality of umbrella-shaped sheds that are formed at an outer periphery of the body part; and an electric-field stress-control layer that is composed of a zinc oxide layer or a high-permittivity layer, and is disposed along an interface between the insulating tube and the polymer covering. A rear end part of the electric-field stress-control layer is connected to the shielding metal fitting. The body part includes a first body part that has a uniform thickness, and a second body part that is located in a region around a front end part of the electric-field stress-control layer and has a thickness greater than the thickness of the first body part.