UA69594A - Transformer with three-phase input and two-phase output - Google Patents

Abstract

The proposed transformer with three-phase input and two-phase output contains a three-phase primary winding, which is open-delta connected, and a two-phase secondary windings. The windings are arranged at a strip-wound magnetic circuit with an air gap. The magnetic circuit consists of two identical horseshoe-shaped sections joined by a central core.

Description

Description of the invention

The invention relates to electrical engineering, mainly to three-phase-two-phase transformers with tape 2 wound split multi-bar magnet wires and can be used in the energy and electrotechnical industries, especially in small and medium power circuits.

At the current state of the art, three-phase-two-phase transformers are known, which can be divided into three types: 1) group consisting of two unequal single-phase transformers (Scott scheme); 2) with a conventional primary winding and a traditional three-phase magnetic circuit (Kübler transformer, 70 AEG transformer, Leblanc transformer and transformer with two connected windings); 3) with an asymmetric primary winding and with a three-bar magnet wire, in which the middle bar has a cross-sectional area 5 times larger than each of its outer bars (Zons transformer) (Bamdas A.M., Kulinych V.A., Shapiro S. V. Static electromagnetic converters of frequency and number of phases, - M.-L.: Gosznergoizdat, 1961.-208 p.; Vekskler, G. S., Tetelbaum, Y. I. Zlektropitanie radio-ustroystv.- K.:

Technics, 1966. - 383 p.).

The disadvantages of the Scott scheme include the presence of two single-phase transformers with different parameters, which is technologically inconvenient. The presence of two magnetic systems leads to an increase in the mass-dimensional indicators and, accordingly, the loss of electricity in active materials, compared to one three-phase 2o bistem. The disadvantage of schemes from the second group is the presence of secondary windings with different numbers of turns. The third group has shortcomings in the discrepancy in the number of turns for different phases in the primary and secondary windings, as well as uneven cross-sections of the magnetic core rods. These circumstances limit the widespread use of three-phase-two-phase transformers.

The closest to the proposed three-phase-two-phase transformer, and accepted as a prototype, is the Group three-phase transformer, which also consists of two identical single-phase transformers, the primary windings of which are connected according to the "open triangle" scheme (Vasyutinsky S.B. Vopros'i teorii i calculation of "transformers. - L.: Znergia, 1970 -432 p.). In single-phase transformers, charged or wound split multi-core magnetic conductors are used. The use of wound split multi-core magnetic cores is the most profitable, because they have smaller mass and size indicators and losses. The presence of two "E of single-phase transformers in the design of the prototype, as well as in Scott's scheme, leads to an increase in weight and size indicators. me)

The technical task of the invention is to create a new design of a three-phase-two-phase transformer, which will allow you to convert the three-phase voltage of the network into two voltages that are phase-shifted relative to each other, and should provide improvements in the weight, size and technical and economic characteristics of the transformer, in Me) compared to the prototype. co

The technical result of the application of the invention is the production of a three-phase-two-phase transformer, which converts three-phase voltage into two voltages that are phase-shifted relative to each other and at the same time ensures the manufacturability of manufacturing and the improvement of the transformer's weight, size and technical and economic characteristics, compared to the prototype. "

The essence of the invention is that when powering the transformer from a three-phase network, one three-phase-two-phase transformer is used to obtain two -/-ptv) s phase-shifted voltages. A three-phase-two-phase transformer allows you to obtain secondary voltages shifted by 90 or 120 degrees relative to each other, depending on the connection scheme of the windings and the size of the cross-section of the central core of the magnet wire.

In the new three-phase-two-phase transformer, one multi-core wound split magnet wire is used. The magnetoconductor consists of a tape rod wound split magnetic conductor, which has two identical horseshoe-shaped parts and a central rod. The central core is placed between the ends of the cores of two horseshoe-shaped parts of the tape core coiled split magnetic conductor. ik The thickness of the central rod is equal to the width of the tape of the tape rod wound sectioned magnetic conductor, and the width is equal to the thickness of the winding of the tape rod wound sectioned magnetic conductor, or more. The central rod is made in the form of a package, which is assembled from rectangular plates of electrical steel or is made from an O-shaped wound rod and uncut magnetic wire, with subsequent giving it a flattened shape. The ribbons of the rods of the two horseshoe-shaped parts of the ribbon-rod wound split magnetic conductor in the junction area are perpendicular to the planes of the rectangular plates of the magnetic conductor package or to the ribbons of the flattened ribbon-to-rod wound non-split magnetic conductor. The use of such a magnetic circuit provides manufacturability and ease of assembly of the transformer, as well as the ability to increase the magnetic induction to

P» 1.7... 1.8T, which leads to a decrease in the cross-section of the rods of the multi-rod magnetic circuit, and therefore to a decrease in its mass.

There are three options for connecting the windings of a three-phase-two-phase transformer: 60 a) the primary windings are connected in an "open triangle, and the secondary windings are independent. At the same time, on the secondary side we get two voltages shifted by 120 degrees relative to each other. In this in this case, the width of the central rod is equal to the thickness of the strip-rod wound split magnetic conductor; b) the windings of the transformer are connected according to the Scott scheme. At the same time, we get two secondary voltages, shifted by 90 degrees relative to each other. In this case, the central rod should be 5 times greater than 65 the thickness of the tape core wound split magnetic conductor; c) the primary and secondary windings are connected in an "open triangle. At the same time, we receive a three-phase voltage on the secondary side, and the transformer works like a normal three-phase one. In this case, the width of the central rod is equal to the thickness of the tape rod wound split magnetic conductor.

The windings of a three-phase-two-phase transformer can be placed in two coils, which are placed

On sections of tape rod wound split magnetic conductors, parallel to the central rod, or in four coils placed on the rods of tape rod wound split magnetic conductors, which are adjacent to the central rod. The second option for placing coils with windings is the most rational, because such placement provides improved cooling conditions, which makes it possible to increase the current density in the conductors, and, therefore, to reduce their cross-section. This reduces the mass of the conductors of the transformer windings.

The contact surfaces of the two horseshoe-shaped parts of the tape core wound split magnetic conductor with the central core are smeared with magneto-dielectric paste or magneto-dielectric compound.

The described design of the three-phase-two-phase transformer allows to increase the value of the magnetic induction in the multi-core magnet wire of the transformer, as well as to increase the current density in the conductors /5 windings, to reduce the losses in steel, to ensure the manufacturability of manufacturing and assembly, i.e. to improve the weight, size and technical and economic indicators, compared to prototype

List of drawing figures.

Figures 1, 2, C show three projections of a three-phase-two-phase transformer. The transformer consists of a multi-core wound split magnetic core, consisting of a ribbon core wound 2 o split magnetic core 1, which has two identical horseshoe-shaped parts and a central core 2, which is located between the ends of the rods of two horseshoe-shaped parts of the ribbon core wound split magnetic core. Four coils with windings Z of the transformer, placed respectively on four rods of a multi-rod magnetic circuit, adjacent to the central rod and having the same geometric dimensions.

Fig. 4-7 shows variants of the central rod. It can be made in the form of a package made of rectangular plates of electrotechnical steel, fig. 4, a, or from an O-shaped wound rod " uncut magnetic wire, with subsequent giving it a flattened shape, fig. b. In Fig. 4-7, given designations: p - width of the rod; P - rod height; and is the thickness of the rod.

Fig. 8-10 shows a view from the front and from the top of a three-phase-two-phase transformer, in which the windings with "g" and conductors are placed not in four, but in two coils "Z", which have the same geometric dimensions and are placed on the sections of the horseshoe-shaped parts of the tape core wound split magnetic circuit parallel to the central rod. yu

The three-phase-two-phase transformer is designed to convert electrical energy in three-phase networks into two-phase, and works in this way. Me

In the transformer, coils with primary and secondary windings are contained on the rods of the multi-rod magnetic circuit. The primary windings of the transformer are connected to the alternating current network.

At the same time, current flows through these windings. The magnetomotive forces caused by this current create variable magnetic fluxes in the tape multi-rod magnetic conductor of the transformer. Magnetic fluxes are coupled to the primary and secondary windings of the transformer. Magnetic fluxes, in accordance with the law of "electromagnetic induction", induce electromotive forces of self-induction in the primary windings of the transformer, and electromotive forces of mutual induction from the secondary windings of the transformer. When the secondary windings are connected to the load, alternating current flows in these windings. Depending on the connection scheme of the windings and their;" parameters, on the secondary side of the transformer we get two voltages that are shifted in phase relative to each other. This is how the transformation of electrical energy takes place.

The economic effect of the invention is achieved by reducing the consumption of active materials, which are used in the manufacture of a three-phase-two-phase transformer, in comparison with the prototype, and reducing losses in steel. (Te; / / / tt sl / ny sh-

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Claims (10)

The formula of the invention. and? 1. A three-phase-two-phase transformer, the primary windings of which are connected according to the "open triangle" scheme, which is distinguished by the fact that the magnetic core of the transformer consists of a tape-rod wound FO split magnetic core, which has two identical horseshoe-shaped parts and a central core placed between the ends rods of two horseshoe-shaped parts of a tape rod wound split magnetic circuit. re) 2. A three-phase-two-phase transformer according to claim 1, which differs in that in the transformer, the thickness of the central core is equal to the width of the strip of the strip-rod wound split magnetic conductor, and the width 5r is equal to the thickness of the winding of the strip-rod wound split magnetic conductor. is) 3. A three-phase-two-phase transformer according to claims 1 and 2, which is characterized by the fact that the transformer includes four coils with windings placed on the rods of horseshoe-shaped tape rod-wound split magnetic conductors adjacent to the central rod. 4. A three-phase-two-phase transformer according to claims 1, 2, which differs in that the transformer includes two coils with windings located on the sections of horseshoe-shaped ribbon core wound split magnetic conductors, parallel to the central core. » 5. Three-phase-two-phase transformer according to claims 1, 3, 4, which is characterized by the fact that in the transformer the primary windings are connected according to the Scott scheme, while the width of the central core is chosen to be 5 times greater than the thickness of the winding of the tape-core wound split magnetic conductor. 60 6. Three-phase-two-phase transformer according to claims 1-5, which is characterized by the fact that in the transformer, the central core is made in the form of a package made of rectangular plates of electrical steel. 7. A three-phase-two-phase transformer according to claims 1-5, which is characterized by the fact that in the transformer, the central core is made of an O-shaped coiled core of an uncut magnetic core, with 65 subsequent giving it a flattened shape. 8. A three-phase-two-phase transformer according to claims 1-7, which is characterized by the fact that in the transformer, the ribbons of the rods of two horseshoe-shaped parts of the ribbon rod wound split magnetic conductor in the junction area are perpendicular to the planes of the rectangular plates or the ribbons of the flattened ribbon rod wound uncut magnetic conductor of the central rod. 9. A three-phase-two-phase transformer according to claims 1-8, which is characterized by the fact that in the transformer, the surfaces of the junction of two horseshoe-shaped parts of the ribbon core wound split magnetic conductor with the central core are smeared with magneto-dielectric paste. 10. A three-phase-two-phase transformer according to claims 1-8, which is characterized by the fact that in the transformer, the surfaces of the junction of two horseshoe-shaped parts of a tape rod wound split magnetic conductor with a 7/0 central rod are smeared with a magneto-dielectric compound. Official bulletin "Industrial Property". Book 1 "Inventions, useful models, topographies of integrated microcircuits", 2004, M 9, 15.09.2004. State Department of Intellectual Property of the Ministry of Education and Science of Ukraine. « « (o) iv) (o) (Se) - and? (o) se) 1 se) s» 60 b5