GB1564817A - Capacitatively controlled layer winding arrangement - Google Patents

Description

(54) A CAPACITATIVELY CONTROLLED LAYER WINDING ARRANGEMENT (71) We, TRANSFORMATOREN UNION AKTIENGESELLSCHAFT of Deckerstrasse 5, 7 Stuttgart-Bad Cannstatt, Federal Republic of Germany, a German Body Corporate, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:- The invention relates to a capacitatively controlled layer winding arrangement for transformers and chokes made of at least two main conductors carrying the energizing current and a control conductor spatially parallel thereto and carrying only a capacitative energizing current.

It is proposed, in Patent Specification No.

1,528,130, to assign a control conductor comprising an even number of parts, each two adjacent ones of which are of equal size and form a control conductor pair, to each layer of the continuously wound main conductor.

Thus, of the two parts of the same control conductor pair, the inner adjacent ends are electrically insulated with respect to one another and the outer ends which are not adjacent are connected together via a by-pass line.

Figures 9 and 10 of Patent Specification No. 1,528,130 disclose layer windings for very high current intensities with main conductors composed of individual conductors connected electrically in parallel. The individual conductors of the same layer lie axially adjacent and each of the individual conductors has its own control conductor.

In this arrangement the relatively small control capacitance achieved despite not inconsiderable expense is unsatisfactory for some purposes.

The present invention seeks to improve the oscillation action of layer windings with poor capacitance and also seeks to maintain predetermined requirements for insulation and difference voltages.

According to the invention, there is provided a capacitatively controlled layer winding arrangement for a transformer or choke, the layer winding arrangement comprising at least two individual main conductoTs connected in parallel for carrying the load current, which conductors are wound to form radially spaced cylindrical layers with at least one pair of interconnected part control windings, formed from a control conductor, for carrying only a capacitatively energizing current located in the cylindrical space therebetween, the part control windings being insulated from each other at their adjacent ends and connected together at their non-adjacent ends.

According to an advantageous embodiment of the invention, there are two individual main conductors which are crossconnected at a position within the arrangement such that the conductor forming the inner cylindrical layer transposes to the outer cylindrical layer and vice versa and wherein the part control windings lie on the same diameter of the winding arrangement between the layers and are free of crossconnections over the entire length of the layer.

freferably, a by-pass line is disposed outside the outer layer ofthe main conductors for the purpose of connecting the nonadjacent outer ends of the said part control windings.

The invention is very advantageous because it can permit doubling of the effective control capacitance by inserting the control conductor between two radially disposed parallel layers formed by main conductors.

In order that the invention and its various other preferred features may be understood more easily, an embodiment thereof will now be described, by way of example only, with reference to the drawing which shows a cross-sectional view of a winding arrangement according to the invention.

Referring to the drawing, a winding arrangement 13 is provided around a core 9, laminated from transformer sheet, as a first of a number of such arrangements. This winding arrangement may, for example, be part of a coarsely tapped winding or it may also be part of a low voltage or middle voltage (5 to 40 kv) winding.

Furthermore, the winding arrangement 13 may be a component part of any desired multilayer winding.

The winding arrangement 13 is wound from a main conductor 1 composed. of two conductors la and Ib leading from the energizing current. The conductors la and lb lie radially one on top of the other and they sandwich between them a thin control conductor. 2. The axial extent of the control conductor 2 is equal to the axial extent of the individual conductors la and ib.

The control conductor 2 comprises an even number of part control windings which exist by virtue of breaks in the control conductor.

Every two adjacent part control windings are joined together externally to form a pair and are connected together electrically at their non-adjacent ends via a by-pass line 3.

The part control windings of the control conductor 2 forming a pair are of the same size, however the part control windings of successive pairs may have different lengths.

As a result of its arrangement between the conductors la and lb, the control conductor 2 lies on the same diameter of the winding over the entire length of the layer.

The number of winding layer arrangements in accordance with the invention which are present is dependent on the voltage. In one case all layers of one winding are constituted by winding layer arrangements according to the invention.

WHAT WE CLAIM I5:- 1. A capacitatively controlled layer winding arrangement for a transformer or choke, the layer winding arrangement comprising at least two individual main conductors connected in parallel for carrying the load current, which conductors are wound to form radially spaced cylindrical layers with at least one pair of interconnected part control windings, formed from a control conductor, for carrying only a capacitatively energizing current located in the cylindrical space therebetween, the part control windings being insulated from each other at their adjacent ends and connected together at their non-adjacent ends.

2. A capacitatively controlled layer winding arrangement as claimed in claim 1, wherein there are two individual main conductors which are cross-connected at a position within the arrangement such that the conductor forming the inner cylindrical layer transposes to the outer cylindrical layer and vice versa and wherein the part control windings lie on the same diameter of the winding arrangement between the layers and are free of cross-connections over the entire length of the layer.

3. A capacitatively controlled layer winding as claimed in claim 1 or 2, wherein a by-pass line for connecting the non-adjacent outer ends of said part control windings is disposed outside the outer layer of the main conductor.

4. A capacitatively controlled layer winding for a transformer or choke substantially as described herein with reference to the drawings.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims (4)

**WARNING** start of CLMS field may overlap end of DESC **. cross-sectional view of a winding arrangement according to the invention. Referring to the drawing, a winding arrangement 13 is provided around a core 9, laminated from transformer sheet, as a first of a number of such arrangements. This winding arrangement may, for example, be part of a coarsely tapped winding or it may also be part of a low voltage or middle voltage (5 to 40 kv) winding. Furthermore, the winding arrangement 13 may be a component part of any desired multilayer winding. The winding arrangement 13 is wound from a main conductor 1 composed. of two conductors la and Ib leading from the energizing current. The conductors la and lb lie radially one on top of the other and they sandwich between them a thin control conductor. 2. The axial extent of the control conductor 2 is equal to the axial extent of the individual conductors la and ib. The control conductor 2 comprises an even number of part control windings which exist by virtue of breaks in the control conductor. Every two adjacent part control windings are joined together externally to form a pair and are connected together electrically at their non-adjacent ends via a by-pass line 3. The part control windings of the control conductor 2 forming a pair are of the same size, however the part control windings of successive pairs may have different lengths. As a result of its arrangement between the conductors la and lb, the control conductor 2 lies on the same diameter of the winding over the entire length of the layer. The number of winding layer arrangements in accordance with the invention which are present is dependent on the voltage. In one case all layers of one winding are constituted by winding layer arrangements according to the invention. WHAT WE CLAIM I5:-

1. A capacitatively controlled layer winding arrangement for a transformer or choke, the layer winding arrangement comprising at least two individual main conductors connected in parallel for carrying the load current, which conductors are wound to form radially spaced cylindrical layers with at least one pair of interconnected part control windings, formed from a control conductor, for carrying only a capacitatively energizing current located in the cylindrical space therebetween, the part control windings being insulated from each other at their adjacent ends and connected together at their non-adjacent ends.

2. A capacitatively controlled layer winding arrangement as claimed in claim 1, wherein there are two individual main conductors which are cross-connected at a position within the arrangement such that the conductor forming the inner cylindrical layer transposes to the outer cylindrical layer and vice versa and wherein the part control windings lie on the same diameter of the winding arrangement between the layers and are free of cross-connections over the entire length of the layer.

3. A capacitatively controlled layer winding as claimed in claim 1 or 2, wherein a by-pass line for connecting the non-adjacent outer ends of said part control windings is disposed outside the outer layer of the main conductor.

4. A capacitatively controlled layer winding for a transformer or choke substantially as described herein with reference to the drawings.