DE2850190A1 - High dielectric strength HV transformer - uses inter-connecting combs to form half-shells for accommodating coil bobbins - Google Patents

Abstract

The transformer with increased dielectric strength is suitable for high voltages and is designed to fully exploit the electrical insulation properties of modern materials with high dielectric strength without incurring high design costs. Thus, the coils are held in two combs that can be inserted into one another to form half-shells (4, 5) for accommodating the coils (23). The walls of the transformer are specif. made conical with a length matching the width of the windings (coils). The length of wiring lay is more specif. increased by means of a bridge-piece for subdividing the wall between the bobbins.

Description

High-voltage resistant transformer

The invention is concerned with a high-voltage-resistant transformer according to the preamble of claim 1.

There are known transformers in which the coils are made with the help of foils are isolated from each other, the number of foils is chosen so that one Breakdown at the intended voltage is avoided. It is also already known embed the coils in cast resin, for example, and choose the layer thickness so that that it does not lead to a breakdown at the given voltage. In the end can put the coil of the transformer in brackets and to achieve longer Creepage distances are used in an oil-filled container.

However, all these known transformers have the disadvantage that either no long lay lengths can be realized or very complex in the Manufacturing are. In addition, the excellent electrical insulation properties modern high-voltage-resistant materials are not fully utilized in this technology will.

It is therefore the object of the invention to create a transformer, in which the properties of modern materials come into their own and the in is easy to assemble to a high degree.

According to the invention, this object is achieved by de in the characterizing part of the main claim specified features solved. Further developments of the invention are in the subclaims marked.

The main advantage of the transformer according to the invention is in that it has large creepage distances and lay lengths between the coils.

In the figures, exemplary embodiments of the invention are shown in a section.

The coils with their holder are pushed onto a core sheet 1 and fixed by looping around with a strap. The holder for the bobbins 2 and 3 consists of the half-shells 4 and 5. The half-shell 4 has the wall point 4.1, 4.t and 4.3 and the half-shell 5, the wall parts 5.1, S.2 and 5.3 on (Fig. 1). These wall parts are conical in shape and roughly correspond in length the coil width. After inserting the bobbins into their proper chambers, optionally with the insertion of insulating dividing discs 6 and t on the outer surfaces the bobbin t and 3, the half-shells 4 and% are plugged into one another. the Conical formation of the wall parts guaranteed a sufficient one Connection of both half-shells in the assembled state, which, however, if necessary, can be secured by gluing or ultrasonic welding.

E'all the lay length between the two bobbins 2 and 3 further should be increased, this can, as shown in index Fig. 2, by repeated Subdivision of the wall takes place.

In this case, the half-shell 5 from FIG. 1 is subdivided again in parts 5 and 8, so that between the wall parts 5.2 and 8.2 the wall 4.3 of the half-shell 4 can intervene.

With this design of the middle wall, the lay length can be almost to be doubled.

The above-mentioned subdivision of the half-shell 5 from FIG. 1 is based on the technical tools Reasons made because otherwise the production of the half-shells 4 and 5 would be too expensive will. For the assembly of the bracket, this means, as can be seen from Fig. 2, that the coil 2 with its holder 8 and the wall parts 8.1 and 8.2 from below inserted into the half-shells 4 and 5 and through at a suitable point, e.g. at 9 Bltraschweißung is connected to the half-shell 5.

In order to have a sufficient amount when leading out the windings 2 and 3 To ensure creepage distance against the metallic core sheet 1, can Balconies 10 and 11 are molded onto the half-shells 4 and 5.

With the bracket shown as an example for a high-voltage-proof Transmitters allow large creepage distances and pitch lengths to be achieved.

Blank page

Claims (3)

High-voltage resistant transformer Patent claims High-voltage resistant transformer, in which the bobbins are enclosed in brackets, thereby characterized in that the holder consists of two nestable chambers for receiving the bobbin forming half-shells consists. 2. Transmitter according to claim 1, characterized in that the walls are conical and their length corresponds to the coil width. 3. Transformer according to claim 1, characterized in that a web the wall between the bobbins to increase the lay length again divided. Transmitter according to Claim 1, characterized in that each half-shell has a balcony that provides sufficient insulation for the winding that is led out guaranteed against the metallic core sheet.