Method of manufacturing a lightning arrester and a lightning arrester obtained by the method
First Claim
1. A method of manufacturing a lightning arrester by assembling a stack of pellets made of a varistor type material separated by spacers and terminated by two metal end fittings, providing electrical connections between successive pellets and between the end pellets and the two end fittings, and winding a filament around said stack, wherein the method includes the following steps:
- selecting the spacers to be tubular and providing said electrical connections between metal-coated faces of pairs of adjacent pellets inside the spacers;
performing said filament winding with resin impregnated glass fibers in such a manner as to ensure that all of the component parts of the stack remain properly alignedand the resin impregnated glass fibers adhere to and radially bind said stack without imposing significant longitudinal compression;
polymerizing the resin in the impregnated glass fibers; and
injecting a coating of EPDM type material over the polymerized glass fiber winding.
1 Assignment
0 Petitions
Accused Products
Abstract
A lightning arrester includes a stack of zinc oxide pellets (1) seated in counterbored recesses of intermediate tubular spacers (2) and two metal end fittings (3). This assembly is wrapped in a filament winding (4) at an angle of 80-90 degrees with the stack axis, thereby providing radial binding without significant axial compression. The filament winding adheres to the side surfaces of all the components of the stack.
-
Citations
8 Claims
-
1. A method of manufacturing a lightning arrester by assembling a stack of pellets made of a varistor type material separated by spacers and terminated by two metal end fittings, providing electrical connections between successive pellets and between the end pellets and the two end fittings, and winding a filament around said stack, wherein the method includes the following steps:
-
selecting the spacers to be tubular and providing said electrical connections between metal-coated faces of pairs of adjacent pellets inside the spacers; performing said filament winding with resin impregnated glass fibers in such a manner as to ensure that all of the component parts of the stack remain properly aligned and the resin impregnated glass fibers adhere to and radially bind said stack without imposing significant longitudinal compression; polymerizing the resin in the impregnated glass fibers; and
injecting a coating of EPDM type material over the polymerized glass fiber winding. - View Dependent Claims (2, 3, 4, 5, 6)
-
- 7. A lightning arrester comprising a stack of pellets of varistor type material separated by spacers and terminated by metal end fittings, and an envelope of resin-impregnated glass fibers, wherein said spacers are tubular, wherein the spacers and the metal end fittings include means located in internal housings for ensuring electrical connection along the entire stack, wherei said envelope provides radial binding for said stack without significant axial compression but with adherence to the side surfaces of said pellets, of said spacers, and of said end fittings, and wherein said envelope is provided with a coating of fins made of injected elastomer.
Specification