| 摘要 |
The outer surface of the body and of the sheds of an electrical high-voltage insulator is covered with a semiconductive layer (10) having a surface resistivity of between 1 and 1000 M OMEGA /square. The semiconductive layer is in electrically conductive contact with the metal end fittings such that an electric current will flow over the surface of the body and of the sheds through the semiconductive surface layer causing a voltage drop along the body between the end fittings. A non uniformity of the voltage drop along the insulator is provided by that at least one of the following features, namely that the number of squares of the surface of the body and of the at least one shed within said at least one first section in the direction of the current flow is significantly greater than in other sections of the insulator of equal length, and/or that the surface resistivity in said at least one first section is significantly higher than in other sections of the insulator. |
