JPS6221204A - Strip-wound transformer - Google Patents

Abstract

PURPOSE:To alleviate the concentration of electric field on a lead-out wire by a method wherein the part where the lead-out wire of a strip winding is opposing to the other winding is entirely covered with a smoothed conductive thin plate, which is maintained equipotential with the lead-out wire. CONSTITUTION:As a strip conductor 7 and a lead-out wire 4 are connected by welding and the like, the cross-sectional area of the lead-out wire 4 becomes larger in the case of the winding 1 for a large current, and a sharp-edged corner part 4' is formed. The lead-out wire 4 and the strip conductor 7 located on its circumference are covered with a smooth-surfaced conductive thin plate 5, they are fixed by fastening to the outer circumference of the winding 1 using an insulator 6, and the thin plate 5 and the lead-out wire 4 are connected. According to this constitution, the concentration of electric field on the lead-out wire can be prevented, and the winding opposing to the lead-out wire can be brought closer to the lead wire, thereby enabling to make the transformer small in size. Also, the chamfering work to be performed on the lead-out part is unnecessitated.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a strip-wound transformer equipped with at least one strip winding, and particularly to a strip-wound transformer that alleviates local electric field concentration on the lead-out conductor portion of the strip winding. It is about the means.

[Background of the invention]

A lead conductor, usually made of a rectangular wire, is connected to the winding start end and winding end of a strip winding formed by two turns of a strip conductor, and is led out to the outside. The connection between the strip conductor and the lead conductor is performed by welding, cold pressure welding, brazing, etc., but in this case, sharp protrusions may occur at the connection portion of the lead conductor or the lead conductor. Furthermore, if the current flowing through the winding is large, the cross-sectional area of the lead conductor will also be large, resulting in sharp corners.

For this reason, especially in dry type transformers, corona is likely to occur due to electric field concentration at the lead conductor portion of the strip winding that faces other concentrically arranged windings.

Conventionally, corona was generated due to this electric field concentration2, and the distance between the opposing windings was increased or
As shown in Publication No. 3, this problem has been prevented by chamfering or deburring the corners of the lead conductor, but this increases the winding dimensions and requires a lot of man-hours to remove and deburr. was a problem.

[Purpose of the invention]

An object of the present invention is to provide a strip-wound transformer that can alleviate electric field concentration on the lead conductor portion of a strip-wound wire and improve the electrical characteristics of the winding without increasing the winding dimensions and at low cost. It is about providing.

[Summary of the invention]

The present invention provides a strip-wound transformer comprising at least one of the windings arranged concentrically or a strip winding, in which the entire portion of the lead-out conductor connected to the strip winding facing the other windings is made of a thin plate conductor with a smooth surface. The conductor is covered with a thin plate conductor and has the same potential as the lead conductor.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to FIGS. 1 to 4. The reference numerals in the figures are the same for the same parts.

In Figures 1 and 2, two concentric windings 1 and 2 are combined with an iron core 9, only the inner winding (low voltage winding) 1 is a strip winding, and the outer winding (high voltage winding) is a strip winding. , ) 2 is an example of a normal winding formed by winding electric wire. In this example, lead conductors 3 .
4, the entire portion of the winding end side lead-out conductor 4 facing the outer winding gJ2 is covered with a thin plate conductor 5 having a smooth surface without sharp corners or protrusions.

As the thin plate conductor 5, a thin plate of good conductivity such as steel or aluminum is used, and it is set at the same potential as the lead conductor 4 so as not to become a floating electrode.

The 7P narrow groove part number of the end side outlet conductor part of the above volume is shown in Figures 3 and 4.

In FIG. 3, the strip winding 1 is constructed by winding a strip conductor 7 made of steel, aluminum, etc. together with an inter-turn insulator 8, and an outlet conductor 4 made of a rectangular wire is connected to the winding end of the strip conductor 7. , pulled out to the outside.

Since the strip conductor 7 and the lead conductor 4 are connected by welding, cold pressure brazing, etc., sharp protrusions may be formed on the strip conductor 7 and the lead conductor 4, and the current flowing through the winding may For larger ones, the cross-sectional area of the zero output conductor 4 becomes larger,
A sharp corner 4' results. This lead-out conductor 4 and the surrounding strip conductor 7 are covered with a thin plate conductor 5 having a smooth surface, and are tightly bound and fixed to the outer peripheral surface of the strip winding 1 with an insulator 6, and the thin plate conductor 5
'f: Connect electrically to the lead conductor 4 so that it has the same potential as the lead conductor 4.

FIG. 4 shows an example in which a folded portion 5' is provided in order to avoid electric field concentration at the end of the thin plate conductor 5. In this way, the entire portion of the thin plate conductor 5 facing the outer winding IIa2 of the lead conductor 4 is shown. By covering the lead conductor 4 with a sharp protrusion or corner 4', it is electrically shielded from the opposing winding 2, which alleviates local electric field concentration on the conductor. Good effects can be obtained.

The above embodiment is a case where only the inner winding a (low voltage winding) is a strip winding, but the same name can be applied to the case where the outer winding (high voltage winding) is a strip winding. . In addition, high masterpiece f
Is'f: When a strip winding is used, the above structure can be layered on the ground portion of the iron core or the lead conductor portion facing the winding of the other phase to alleviate electric field concentration.

〔Effect of the invention〕

According to the present invention, by simply covering the lead-out conductor part of a single-thread winding with a thin plate conductor with a smooth surface, local concentration of electric field on this lead-out conductor part can be prevented. The spacing between the windings and other windings can be reduced, resulting in smaller winding dimensions, making the transformer smaller and lighter, and eliminating the need for chamfering or deburring the lead-out conductor of the strip winding, reducing manufacturing man-hours. can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing one embodiment of the present invention, Fig. 2 is a sectional view of the same side, Fig. 3 is a detailed view of part A in Fig. 1, S Fig. 4 is a detailed view showing a modification of the same as above. It is. 1... Strip winding 2... Other windings 3.4... Lead conductor 5... Thin plate conductor, -\

Claims (1)

[Claims] In a strip-wound transformer in which at least one of the concentrically arranged windings is a strip winding, the entire portion of the lead-out conductor connected to the strip winding that faces the other windings is covered with a thin plate conductor with a smooth surface. A strip transformer characterized in that a conductor has the same potential as the lead-out conductor.