Disc-type insulator with a cast-in electrode and process for its

Abstract

A disc-type insulator for enclosed high-voltage equipment includes a cast-in electrode which is segmented and which extends peripherally and concentrically with respect to the edge surface of the disc. The cast-in electrode is connected to contact electrodes by means of contact tongues, the contact electrodes bearing against a metal mounting ring. To avoid damage to the disc-type insulator, to the contact tongues, or to the cast-in electrode during shrinkage of the disc-type insulator, following its casting, or damage resulting from thermal stresses during operation, the cast-in electrode is divided into a plurality of electrode segments which follow one another in the peripheral direction. The contact tongues are formed of bent-over extensions of the electrode segments and are 'S' shaped. The electrode segments are composed of aluminum sheet which may have a smooth surface. The contact electrodes are fastened to the mounting ring by means of bolts. During the manufacture of the disc-type insulator, the electrode segments are fixed in the casting mold, before the casting operation begins. The segments are fixed by fastening the contact electrodes to a portion of the casting mold. Each of the electrode segments, with the associated contact tongues and contact electrodes, may be manufactured from a single part which is appropriately bent into the desired final shape.