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Production-optimized and reliable cast epoxy interrupter chamber insulator

IP.com Disclosure Number: IPCOM000246049D
Publication Date: 2016-Apr-29
Document File: 5 page(s) / 259K

Publishing Venue

The IP.com Prior Art Database

Related People

ABB Technology AG: OWNER

Abstract

This disclosure is directed to a new and innovative optimized and reliable cast epoxy interrupter chamber insulator such as used for a high voltage interrupter, for example, as well as to method for its production including a cast in a twofold mold.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 37% of the total text.

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Production‐optimized and reliable cast epoxy interrupter chamber insulator Author: Thomas Sykes; Rico Gasparini

Abstract

This disclosure is directed to a new and innovative optimized and reliable cast epoxy interrupter chamber insulator such as used for a high voltage interrupter, for example, as well as to method for its production including a cast in a twofold mold.

Background

Conventionally, an insulating gap across an interrupter is invariably bridged by a chamber insulator. The function of a chamber insulator is to provide mechanical stability to the interrupter. Typically, fiber reinforced composite tubes, have been used in such applications, as exemplarily shown in Fig. 1. These tubes are conventionally equipped with fixtures allowing them to be attached to the rest of the apparatus conventionally by either by gluing, press fitting or bolting. The latter is shown as exemplarily in Fig. 1.

holes used for attachment

Fig. 1: Traditional solution for a chamber insulator made of a composite tube

However, the difficulty of producing fiber reinforced parts with constant quality coupled with increasing design requirements on reliability has begun to render the traditional solution less attractive. In particular, since it has been found that fiber reinforced parts are difficult to outsource to low-cost markets.

Accordingly, in the past years, attempts have been made to shift the design paradigm of using fiber-reinforced tubes towards using cast epoxy resin parts instead. Particularly, the good

 


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homogeneity, predictability, reliability, and price of cast epoxy based materials are interesting properties for an improved, high quality, and low cost chamber insulator. These solutions have furthermore been demonstrated to work in a number of applications.

However, it has been found that the current designs of cast epoxy chamber insulators, which borrow almost all design features from the fiber reinforced variants, can still be improved with respect to the method of production, e.g. typically vacuum casting or pressure gelation. In particular, the problems associated with the production method (voids, chemical shrinkage, flow, typically) are often encountered when designs call for casting the insulator around complex flanges or introducing windows into the tubular body.

Statement of the problem:

The problem solved by this invention consists principally in reconciling the requirements of production by vacuum casting or pressure gelling of epoxy resin (and with it the safety of the supply chain) and the technical requirements of an interrupter chamber insulator. In particular, the two principal issues associated with the manufacturing of chamber insulators out of cast epoxy resin are: 1) An efficient mechanical means of fixing the resin body; and 2) the complexity of the mold (e.g., in many cases the design of the chamber insulator must allow gas flow through lateral openings).

Therefore, there exists a demand for...