SU900325A1 - Three-phase converting transformer - Google Patents

Description

This invention relates to the field of electrical engineering. namely, transformers for powering high-power multi-pole valve converters having a pulsating frequency. A reverse converter is known, containing four converter transformers, the network and valve windings of each of which are located concentrically at two concentrations on the cores of the magnetic conductor, while the valve windings are connected in a star and in a triangle, and the network windings have such a connection circuit that the phase shift of the voltages converter is equal to 15 el. degrees sp. However, such converters, providing a 2-pulse mode of rectification, are characterized by relatively high dimensions and specific consumption of materials and losses. The closest to the proposed technical entity is a converter containing one transformer, the network and valve windings of which are located concentrically on the cores of the magnetic conductor, forming three concentrates, while the valve winding is divided into four electrically unconnected parts, one of the KOTopbix connected star, located on one side of the power winding, and the other, connected in a triangle, located on the other side of the power winding, and each of the two remaining parts of the winding winding and of two sections, with two sections having a delta connection scheme, located on the same side of the power winding as the part of the valve winding having a delta connection scheme, and these sections, which form different parts of the valve winding, have the reverse phase connection sequence, at the same time the beginning and the ends of the sections located on each rod and

included in the star and the triangle are electrically connected 121,

A disadvantage of the known three-phase converter transformer is an increase in the consumption of materials, ra6apHtoB and power losses.

The purpose of the invention is to reduce the consumption of materials, dimensions and power losses in the converter transformer.

The goal is achieved by the fact that in a three-phase converter transformer containing a core magnetic conductor, a network winding and a valve winding located concentrically on the cores of the magnetic core, the valve winding forming four electrically unconnected parts, one of which is connected in a star, the other in a triangle, each of the two remaining Masts is made of two sections, one of which is connected in a triangle and has the reverse sequence of connecting the phases in two parts, and the beginnings and ends of the sections placed on each rod and forming one part of the valve winding are electrically connected, all parts of the valve winding are placed on one side of the network winding, and the height of one of the sections connected in delta is equal to 0.8-1.2 the height of the other section of the same part of the valve windings, while the heights of the parts with the same connection pattern are equal to each other and are 0.9-1.1 the heights of the parts that have a different connection pattern. In addition, all parts of the valve winding can be placed successively one above the other along the height of the core of the magnetic circuit, which makes it possible to increase the reliability of the transformer due to the reduction of the coupling between the parts of the valve winding, and the parts and sections of the valve winding having a different connection scheme are interlaced between themselves.

The sections of the valve winding are made of conductive tape, with sections of parts having different connection patterns arranged concentrically.

Parts of the winding winding having a different connection scheme and, accordingly, all sections of the two parts of the valve winding can be intertwined with each other.

FIG. 1b shows schematically the proposed three-phase converter transformer.

In the general case, the transformer has a three-core magnetic core, on each of the rods 1 there is a network 2 and a valve winding concentrically located.

The vent winding is divided into four electrically unconnected parts 3 and 4 of section 5-8, with one part having a delta connection circuit and the other part with a star connection circuit.

The device is as follows.

The height of each of the sections having a delta connection scheme is 0.8-1.2 heights of each of the sections of the same parts of the valve winding. The heights of each of the parts formed by sections 5, 6 and 7, 8, respectively, are equal to each other and are 0.91, 1 the heights of the corresponding part 3 and having a triangle and star connection scheme.

Parts 3 and i of the valve winding, as well as parts formed by sections 5 and 6, 7 and 8, respectively, are arranged successively along the height of the magnetic core bar 1 (Fig. 1-3), while sections 5-8 can be made of conductive tapes and are arranged sequentially in the radial direction (Fig. 1) or are arranged in series along the height of the magnetic core rod (Fig. 2), or these sections 5, 6 and 7, 8 can be respectively intertwined.

Parts 3 of the valve winding, having a delta and a star connection, respectively, can be intertwined with each other (FIG. 6), while sections 5, 6 and 7, 8 can be intertwined with each other (Fig. 6) or arranged concentrically (Fig. K ) or sequentially in height (Fig. 5).

Practical equality of the heights of section 5, 6 and 7, 8 and parts 3, t of the valve winding provides a miniature voltage spread of the partial short circuit and, accordingly, a minimum variation of the external characteristics of the valve bridges fed from the parts of the winding winding.

Claims (2)

The voltage shift of the parts of the valve winding, as in the known, allows the proposed transformer to be equipped with a 24-phase conversion circuit. The embodiments shown in Figs. 1 to 3 are characterized by a reduced magnetic coupling between parts of the valve winding. In the embodiments shown in Figs. -b, parts of the valve winding are intertwined, which provides greater rigidity of the external characteristics of valve bridges. Performing all parts of the winding valves on one concentrator allows approximately 1% reduction in material consumption, power losses and transformer dimensions. Claim 1, A three-phase converter transformer comprising a core magnetic conductor, a network winding and a valve winding located concentrically on the terminals of the magnetic conductor, and the winding winding forms four electrically unconnected parts, one of which is connected in a star, the other in a triangle, each of two the remaining parts are made of two sections, one of which is connected in a triangle and has the reverse sequence of connection of the phases in two parts, and the beginnings and ends of the sections located on each m rod and forming one part of the valve winding, are connected electrically, characterized in that, in order to reduce the weight, size and power loss in the transformer, all parts of the valve winding are located on one side of the network winding, and the height of one of the sections connected in delta is 0.8-1.2 heights of the second section of the same part of the valve winding, while the heights of the parts with the same connection pattern are equal to each other and are 0.9 1.1 heights of the parts that have a different connection pattern. 2.Transformer according to item I, which is characterized by the fact that all parts of the valve winding are located (they are consecutively under each other along the height of the core of the magnetic circuit). 3.Transformer according to item 1, which is characterized by the fact that parts and sections of the valve winding , having a different connection scheme, are intertwined. k. A transformer in PP, 1 and 2, characterized in that the valve winding seeds are made of conductive tape, while the sections of parts that have different connection schemes are arranged concentrically. . 1, that all parts of the valve winding and, having a different connection scheme and, accordingly, all the sections of the two parts of the valve with the skein, binding) between them. Sources of information taken into account in the examination 1.Electric Egufpmeot for the 90 3tabsJder contunuos hot rolHng mH I. Ansaldo Societa fienerale Electromecanics. S.P.A. July December 1976 p. 9,912. 2. USSR author's certificate in accordance with the application If 2580 10 / 2l -07, cl. H 01 F 27/28, 05.12.77. ///////////////// 7 // FIG. one //////////////////// Fig. Y ////////////////// Л Phi. ////////////////////// fig ff