RU106437U1 - THREE-PHASE HIGH VOLT TRANSFORMER - Google Patents

Abstract

 1. A three-phase high-voltage transformer containing a magnetic circuit, consisting of rods clamped by two parallel yokes, each of which is covered by a primary winding and one or more secondary windings, characterized in that the upper and lower radiators are introduced into it, made with duct windows and recesses on the inside surfaces connected by fasteners, and the magnetic circuit is located between the radiators and is made spatial with three equally spaced rods covered by one or more coil blocks in this case, the primary winding of each coil block is made in the form of a frameless coil with a rectangular wire mounted on a small rib, with a uniform gap between the turns filled with an insulator, one or more secondary windings are concentric with it, made in the form of a monolithic streamlined body with the possibility of interconnections, while the gaps between the rod and the primary winding, between the primary and one or more secondary windings are filled with an insulating heat-conducting compound And yoke one of its faces arranged in understating the end faces of the coil units, and another side fitted into the recesses radiators on the thermally conductive compound. ! 2. The three-phase high-voltage transformer according to claim 1, characterized in that the recesses on the inner surfaces of the upper and lower radiators are cylindrical. ! 3. The three-phase high-voltage transformer according to claim 1 or 2, characterized in that the yokes are made in the form of an equilateral triangle with rounded vertices, the diameter of the circumference described which

Description

The utility model relates to the field of electronics and can be used in the design of three-phase high-voltage small-sized transformers.

Known three-phase transformer (certificate for utility model RU No. 71811, published 2008.03.20, IPC: H01F 30/12, H01F 27/34) containing a flat magnetic system consisting of three O-shaped magnetic cores, wound from a tape of transformer steel and located in one plane, three primary and three secondary windings located on the frame, and the wound magnetic cores are made integral, and the frame for the windings is made integral.

The design flaws of this transformer include insufficient compactness, electrical and mechanical strength.

Known three-phase transformer (application RU No. 20011114198, published 2003.05.10, IPC: H01F 27/25, H01F 30/12) containing a magnetic circuit and three coil blocks. The magnetic circuit contains two spaced apart parallel plate-like elements and three spaced apart parallel columnar-shaped elementary chains, the columns being almost perpendicular to the plate-shaped elements and enclosed between them. Each column is made with the possibility of carrying one of the three coil blocks and servicing one of the three phases, forming a spatially symmetric structure with respect to the central axis of the transformer.

The disadvantages of the design of this transformer include its limited use due to insufficient heat removal.

Closest to the proposed technical solution is a transformer (patent for invention RU No. 2396625, published 2010.08.10, IPC: H01F 30/12) containing a flat magnetic circuit consisting of four rods clamped by two parallel yokes, each of which is equally spaced from each other and covered by the same primary winding and a group of secondary windings, and the cross-sectional area of the extreme rods is half the cross-sectional area of the rods located between them, and all windings covering one extreme rod are included The sequence and in accordance with the same windings covering other extreme rod.

The disadvantages of the design of this transformer include its limited use due to insufficient heat removal, electrical and mechanical strength.

The technical result of the proposed technical solution is to increase reliability by providing efficient heat dissipation, increased electrical and mechanical strength while providing a compact design.

The technical result is achieved in that a three-phase high-voltage transformer containing a magnetic circuit, consisting of rods clamped by two parallel yokes, each of which is covered by a primary winding and one or more secondary windings, introduces upper and lower radiators made with duct windows and recesses on the internal surfaces . The radiators are connected by fasteners, and the magnetic circuit is located between the radiators and is made spatial with three equally spaced rods covered by one or more coil blocks. The primary winding of each coil block is made in the form of a frameless coil with a rectangular wire mounted on a small rib, with a uniform gap between the turns filled with an insulator. One or more secondary windings are arranged concentrically to it, made in the form of a streamlined monolithic casing with the possibility of connecting with each other, while the gaps between the rod and the primary winding, between the primary and one or more secondary windings are filled with an electrically insulating heat-conducting compound. The yoke of one of the sides is located in the understatement of the end surfaces of the coil blocks, and the other side is installed in the recesses of the radiators on a heat-conducting compound.

The essence of the utility model is illustrated by drawings:

Figure 1 - General view of a three-phase high-voltage transformer;

Figure 2 is a top view of Figure 1;

Figure 3 is a top view of Figure 2 (without upper radiator);

Figure 4 is a top view of Figure 3 (without yoke);

5 is a General view of the radiator;

6 - the core of the magnetic circuit;

Fig.7 - frameless primary coil with a rod;

Fig. 8 is a view A of Fig. 7;

Fig.9 - monolithic housing of the secondary windings;

Figure 10 - section bB Fig.9.

The three-phase high-voltage transformer contains the upper 1 (Figs. 1-2) and lower 2 (Figs. 1, 3, 4) radiators, a spatial magnetic core placed between them, consisting of three equidistant rods clamped by two parallel yokes 3 (Figs. 1-4) 4 (FIGS. 3, 4, 6-8), each of which is covered by one or more reel blocks 5 (FIGS. 1-3). Fasteners 6 (Fig. 1, 2), made, for example, in the form of studs with nuts, tighten the upper 1 and lower 2 radiators and the spatial magnetic circuit located between them with coil blocks 5.

The upper 1 and lower 2 radiators in the form of brackets of heat-conducting material have a central window of the duct 7 (Figs. 1, 2, 5), and a recess 8 (Figs. 4-5) on the inner surface, for example, of a cylindrical shape, designed to install a yoke 3, as well as holes 9 (Fig. 5) for fasteners 6. In the radiators, holes 10 (Fig. 5) can be made for installing intermediate contacts 11 (Fig. 1). In the supporting protrusions of the upper 1 and lower 2 radiators, holes 12 (FIG. 1) can be made for fastening the transformer in the product.

The yoke 3 is made in the form of an equilateral triangle with rounded peaks and is proportional to the recesses 8 on the inner surface of the radiators. Yarma 3 is installed in recesses 8 on a heat-conducting compound.

The cores 4 of the magnetic circuit are made by a set of plates of different widths, forming steps 13, 14 and 15 (Fig.6) along its lateral surface to provide a minimum clearance between the rod 4 and the primary winding surrounding it.

Each coil unit 5 consists of a concentrically arranged primary winding covering the core 4 of the magnetic circuit, and one or more secondary windings covering the primary.

The primary windings 16 (Fig. 7) are made in the form of single-row frameless coils with a wire 17 (Fig. 8) of rectangular cross section mounted on a small rib in order to increase the number of turns while ensuring compactness, with a uniform gap between the turns. The gap is filled with an insulator 18 (Fig. 8) by winding an insulating cord of cylindrical section with its subsequent impregnation.

The rods 4 of the magnetic circuit are located inside the frameless coils, and the gap between them is filled with an insulating heat-conducting compound 19 (Fig. 8).

The secondary or secondary windings 20 (Fig. 10) are made in the form of a sectional coil embedded in a separate monolithic body of a streamlined shape from an insulating heat-conducting compound, for example, in the form of a cylinder with truncated wedge-shaped protrusions directed in opposite directions to provide better heat removal from the transformer windings . Monolithic cases of sectional coils can be made with the possibility of their connection, for example, in the form of the upper 21 and lower 22 sections (Figs. 9, 10), by means of fixing elements. The fixing elements, for example, the grooves 23 and the protrusions 24 proportional to each other (Fig. 9), can be located on the end surfaces of the monolithic bodies interacting with each other from the side of the truncated wedge-shaped protrusions.

On the end surfaces of the coil blocks 5, for example, the upper 21 and lower 22 sections (Fig. 9), interacting with the yokes 3 of the magnetic circuit, understatements 25 and 26 (Figs. 4, 9) are made, capturing the region of the central hole 27 (Fig. 9) designed to accommodate and fix rounded peaks with the yoke 3 of the magnetic circuit (Figure 3) and ensure their contact with the rods 4.

Between the end surfaces of the sectional coils facing each other, washers 29 (Fig. 9, Fig. 10) are made of electrical insulating material, which serve as insulators and at the same time are regulatory elements that ensure that the ends of the rod 4 are installed in the same plane as the understatement surface 25 and 26 to ensure the necessary density of contact of the rods 4 with the surface of the yoke 3.

Frameless coils of the primary winding 16 with a rod 4 are installed in the central hole 27 of the monolithic cases of sectional coils, and the gap is filled with an insulating heat-conducting compound, forming coil blocks 5.

The coil blocks 5 of a three-phase high-voltage transformer are installed between the yokes of the magnetic circuit in such a way (Fig. 1, Fig. 4) that the truncated wedge-shaped protrusions are directed outside the transformer, while the air flow through the windows of the duct 7 (Fig. 2) of the upper 1 and lower 2 radiators the lateral surfaces of the coil blocks 5 are accessible, facing the central axis of the transformer, and the inner surface of the yoke 3, which allows for unhindered passage of air flows through the inner region of the transformer to both in the vertical and horizontal directions and, thus, its effective cooling.

High-voltage connectors 28 (Figs. 1, 3, 9) of the coil blocks are used for external electrical connection of the transformer, can be connected, for example, via cables (not shown) with intermediate contacts 11 and are located on the side faces of the truncated wedge-shaped protrusions.

Assembling a three-phase high-voltage transformer is as follows.

The primary windings 16 are made in the form of single-row frameless coils with a rectangular wire 17 mounted on a small rib, providing a uniform gap between the turns. The gap is filled with insulator 18, followed by its impregnation. Place the rods 4 of the magnetic circuit inside the frameless coils and fill the gap between them with an insulating heat-conducting compound 19.

Secondary windings 20 are made in the form of sectional coils, for which windings are wound, they are poured into separate monolithic housings from an insulating heat-conducting compound, which are then connected using fixing elements 23 and 24 (if there are more than one sectional coil on one rod), placing washers 29 between the end surfaces of the connected sectional coils.

Frameless coils of the primary winding 16 are placed with rods 4 in the central holes 27 of the monolithic housings of the sectional coils and fill the gap with an insulating heat-conducting compound, forming coil blocks 5.

Install the yoke 3 of the magnetic circuit in the recesses 8 of the upper 1 and lower 2 radiators on a heat-conducting compound.

Install the coil blocks 5 between the yokes 3 of the magnetic circuit, placing the tops of the yoke 3 in understatements 25 and 26 on the upper and lower end sides, and tighten the upper 1 and lower 2 radiators with fasteners 6. Connect the high-voltage connectors 28 of the windings, for example, using high-voltage cables by soldering them to intermediate contacts 11 located in the holes 10 of the upper 1 and lower 2 radiators.

An example of using the inventive device can be a three-phase high-voltage small-sized transformer used in a high-voltage rectifier of electronic equipment with a linear output voltage of 10 kV on each of its secondary windings. The composite design of the multi-section coil with the possibility of their connection with the help of fixing elements makes it possible to simplify the replacement of sections in case of failure and to ensure maintainability of the transformer.

Claims (6)

1. A three-phase high-voltage transformer containing a magnetic circuit, consisting of rods clamped by two parallel yokes, each of which is covered by a primary winding and one or more secondary windings, characterized in that the upper and lower radiators are introduced into it, made with duct windows and recesses on the inside surfaces connected by fasteners, and the magnetic circuit is located between the radiators and is made spatial with three equally spaced rods covered by one or more coil blocks in this case, the primary winding of each coil block is made in the form of a frameless coil with a rectangular wire mounted on a small rib, with a uniform gap between the turns filled with an insulator, one or more secondary windings are concentric with it, made in the form of a monolithic streamlined body with the possibility of interconnections, while the gaps between the rod and the primary winding, between the primary and one or more secondary windings are filled with an insulating heat-conducting compound And yoke one of its faces arranged in understating the end faces of the coil units, and another side fitted into the recesses radiators on the thermally conductive compound. 2. The three-phase high-voltage transformer according to claim 1, characterized in that the recesses on the inner surfaces of the upper and lower radiators are cylindrical. 3. The three-phase high-voltage transformer according to claim 1 or 2, characterized in that the yokes are made in the form of an equilateral triangle with rounded vertices, the diameter of the circumscribed circle of which is equal to the diameter of the recesses of the upper and lower radiators. 4. The three-phase high-voltage transformer according to claim 1, characterized in that the rods are made of a set of plates of different widths, forming steps along its side surface. 5. The three-phase high-voltage transformer according to claim 1, characterized in that the monolithic cases are made with the possibility of connection with the help of fixing elements located on the end surfaces of their bodies. 6. The three-phase high-voltage transformer according to claim 1, characterized in that the insulator between the turns of the primary windings is made by winding an insulating cord of cylindrical section with its subsequent impregnation.