Hollow insulator and method for production thereof

Abstract

A hollow insulator for high electric voltages has an insulating tube and a covering of the insulating tube made from a fiber-reinforced plastic. The covering is placed on an outer surface of the insulating tube. There is also described a method for producing the type of hollow insulator.

Claims

1. A method for producing a hollow insulator for high electrical voltages, the method comprising: manufacturing an insulating tube; and sheathing the insulating tube with a fiber-reinforced plastic by arranging at least one prefabricated fiber mat around the insulating tube and then introducing plastic into the at least one fiber mat by a vacuum impregnation process.

2. The method according to claim 1, which comprises manufacturing the insulating tube from a material selected from the group consisting of a ceramic material, a glass and a plastic.

3. The method according to claim 1, wherein a flange is arranged at at least one end of the insulating tube prior to sheathing the insulating tube.

4. The method according to claim 3, which comprises connecting the at least one flange to the insulating tube by cementing.

5. The method according to claim 1, which comprises placing a flange at at least one end of the sheathing after sheathing the insulating tube.

6. The method according to claim 5, which comprises connecting the at least one flange to the sheathing by an adhesive-bonding connection.

7. A method for producing a hollow insulator for high electrical voltages, the method comprising: manufacturing an insulating tube; and sheathing the insulating tube with a fiber-reinforced plastic by filament-winding the fiber-reinforced plastic around the insulating tube in a wet or dry state.

Description

BRIEF DESCRIPTION OF THE DRAWING

(1) The sole FIGURE of the drawing is a sectional view of a hollow insulator according to the invention.

DESCRIPTION OF THE INVENTION

(2) In the drawing, the single FIGURE shows a sectional illustration of a hollow insulator 1 for high electrical voltages. The hollow insulator 1 comprises an insulating tube 3, a sheathing 5 of the insulating tube 3, a shielding 7 and two flanges 9, 11. The insulating tube 3 is manufactured from a ceramic material or a glass or a plastic such as, for example, polymethyl methacrylate. The sheathing 5 is manufactured from a fiber-reinforced plastic, for example from a fiber-reinforced cast resin such as epoxy resin, and bears against an outer surface of the insulating tube 3. For example, for the purpose of producing the hollow insulator 1, the insulating tube 3 is sheathed with the fiber-reinforced plastic by at least one prefabricated fiber mat being arranged around the insulating tube 3 and then the plastic being introduced into the at least one fiber mat by vacuum impregnation. As an alternative, the insulating tube 3 is sheathed with the fiber-reinforced plastic by the fiber-reinforced plastic being filament-wound around the insulating tube 3 in a wet or dry state.

(3) The flanges 9, 11 are arranged at opposite ends of the hollow insulator 1 and each have a flange collar 15 which runs in an annular manner around an insulator longitudinal axis 13 of the hollow insulator 1. In the exemplary embodiment illustrated in the FIGURE, each flange 9, 11 is connected to an outer surface of the sheathing 5. To this end, the flanges 9, 11 are adhesively bonded, for example, to the sheathing 5. An alternative exemplary embodiment (not illustrated) provides that the sheathing 5 surrounds only a section of the insulating tube 3 that runs between the flanges 9, 11 and each flange 9, 11 is directly connected to the insulating tube 3. To this end, the flanges 9, 11 are cemented, for example, to the insulating tube 3.

(4) The shielding 7 is manufactured from an electrically insulating material, for example from a silicone. The shielding 7 is arranged between the flanges 9, 11 on an outer surface of the sheathing 5 and has a plurality of shield-like fins 17 which run in an annular manner around the insulator longitudinal axis 13.

(5) Although the invention has been illustrated and described in more detail by preferred exemplary embodiments, the invention is not restricted by the disclosed examples and other variations can be derived therefrom by a person skilled in the art without departing from the scope of protection of the invention.