DE3232707A1 - Primary winding, especially for cast-resin insulated current transformers - Google Patents

Abstract

In a primary winding having a strip-shaped primary conductor and a winding start which is passed out, especially for cast-resin-insulated current transformers having an annular core, it is intended to prevent the unfavourable folding which occurs in known transformers when the winding start is passed out and to create a means of passing said winding start out which is space-saving and can be produced as simply as possible. This is achieved by means of the invention in that the primary winding (1) occupies an oblique position within the transformer and the winding start (3) of the primary conductor is bent over the top edge of the strip material and is passed around the coil to the connecting terminals on the outside. <IMAGE>

Description

Primary winding, especially for

Cast Resin Insulated Current Transformer The invention relates to a Primary winding according to the preamble of the single claim.

In known current transformers, the start of the winding is in the form of a folded bend to the outside. The folded bend needs a lot Place. In the connection area that adjoins the winding, however, are the Space is often cramped. As in the production of the folding under certain circumstances a lot of force must be used, there is a risk of damage to the insulation.

The invention is based on the object, in a primary winding, especially for cast resin-insulated current transformers, the unfavorable folding when leading out to avoid the beginning of the winding and a space-saving, easy to manufacture To specify the lead-out.

The object on which the invention is based is provided by the claim marked features solved.

In the following the invention is based on an exemplary embodiment explained in more detail. The drawing shows in Fig. 1 the front view of a primary winding according to the invention with dash-dotted lines of the current transformer core, Fig. 2 shows a plan view of the same primary winding, FIG. 3 shows a side view of the same Primary winding with a view of the winding end that is led out, FIG. 4 shows a section AB through the primary winding in FIG. 1 with the beginning of the winding drawn out.

In the drawing it is preferably made of copper tape built up and denoted by 1 essentially toroidal primary winding. The one from one Legs of the primary winding 1 encompassed toroidal core with secondary winding is indicated with 2 in phantom indicated. The beginning 3 of the primary winding, which is provided with a connection terminal 4 1 is produced in that the primary conductor of the innermost layer over the high Edge of the band material is bent, as Fig. 4 shows particularly clearly. It is then possible to lead the primary conductor past the coil to the outside. In the embodiment shown, the lead-out winding start 3 is still deflected three times by 900 so that terminal 4 is above the primary winding 1 comes to rest, with the primary winding 1 in an inclined position within the converter occupies.

The invention saves space in the area of the primary connections, which is urgently needed, especially for converters with a low overall height. The leads are easy to manufacture with the help of simple tools.

Claims (1)

Patent claim primary winding with ribbon-shaped primary conductor and lead out Start of winding, especially for cast resin-insulated current transformers with toroidal core, thereby characterized in that the primary winding (1) is inclined within the converter occupies and the winding start (3) of the primary conductor over the high edge of the strip material bent, passed the coil outwards to the terminals.