RU190785U1 - VENTILATION OF THE THRESTERN TRANSFORMER - Google Patents

Abstract

The utility model relates to electrical engineering, in particular, to transformer construction, and can be used in three-rod transformers containing valve windings designed to provide "n" pulsation, where n is a multiple of six. A utility model solves the problem of creating a winding multiphase transformer characterized by the minimum complexity of manufacturing a valve winding, as well as simplifying the design of a valve winding due to the equality of the cross sections of all its parts due to the equality of currents in all parts of the winding. To solve the problem in the valve winding of a three-rod transformer, designed to provide "n" pulses, where n is an integer multiple of six, containing in each phase an equal number of parts placed in equal quantities on the cores of the magnetic circuit, one of the parts has a “triangle” connection, it is proposed according to the present utility model, the remaining (n-1) parts are connected into hexagons inscribed in a circle, the diameter (2R) of which is selected depending on the voltage of the part, innate in a triangle, the parallel sides of the polygons are parts located on the same rod, and the stress values of these sides are proportional to their lengths.

Description

The utility model relates to electrical engineering, in particular, to transformer construction and can be used in three-rod transformers containing valve windings designed to provide "n" pulses, where n is a multiple of six.

Known valve winding three-core transformer containing a total number of parts "n", a multiple of six, with an equal number of parts on the rods, placed in equal quantities on the three-core magnetic core, with one part connected in a triangle, and the rest (n-1) parts are connected in triangles with extended sides [L.1].

The disadvantages described in [L. 1] the design of the valve winding multiphase transformer are:

- increased complexity of manufacturing parts of the valve winding;

- the complexity of the design of the winding, due to the large variety of combinations of the number of turns in the parts of the winding and different wire cross sections in the "triangle" and in the extended sides, since the values of the currents in them differ V 3 times.

The utility model solves the problem of creating a valve winding of a multiphase transformer, devoid of the above disadvantage, characterized by minimizing the laboriousness of manufacturing the valve winding, as well as simplifying the design of the valve winding due to the equal sections of all its parts due to the equality of currents in all parts of the winding.

To solve the problem in the valve winding three-core transformer, designed to provide "n" pulse. where n is an integer multiple of six, containing in each phase an equal number of parts placed in equal quantities on the cores of the magnetic circuit, while one of the parts has a “triangle” connection, it is proposed to connect the remaining (n-1) parts according to the present utility model in hexagons inscribed in a circle with a diameter of 2R, where R is the radius of this circle, the diameter of which is chosen depending on the voltage of the part connected in a triangle, the parallel sides of the polygons are parts located on the same rod, and the magnitude of the stresses of these sides are proportional to their lengths.

The utility model is illustrated with an exemplary embodiment of the drawings, in which, respectively, are schematically shown: in FIG. 1 schematic diagram of the motor power supply from the valve winding of a three-phase transformer according to [L. one]; in fig. 2 is a schematic diagram of the connections of the inventive valve winding on all three cores of the magnetic circuit; in fig. 3 is a schematic diagram of the power supply of the engine from the claimed valve winding.

In the above example, the implementation of the utility model presents a valve winding, providing a pulse value of thirty (n = 30) transformers.

In the embodiment shown in FIG. 2 winding connections, parallel lines schematically reflect parts of a valve winding located on one core of a magnetic circuit.

In particular, the parallel lines 1, 2, 3, 4, 5, 6, 7, 8 and 9 reflect the parts of the valve winding located on the same core of the magnetic circuit, parallel to the lines 10, 11, 12, 13, 14, 15, 16, 17 and 18 reflect the parts of the valve winding located on the second core of the magnetic circuit, the parallel lines 19, 20, 21, 22, 23, 24, 25, 26 and 27 reflect the parts of the valve winding located on the third core of the magnetic core.

The solid lines in FIG. 2 shows the diagrams of connections "triangle", as well as - "hexagons", each of which, as a "triangle" and hexagons, are inscribed in a circle with a diameter of 2R. In this case, the parallel sides of the indicated polygons (both triangles and hexagons) are parts located on the same core of the magnetic circuit, and the magnitudes of the voltages of these sides are proportional to their lengths.

The dash-dotted lines in FIG. 2 shows triangles, conventionally inscribed in a circle 28 with a diameter of 2R, shifted relative to each other by 12 °, which ensures the pulsation of the rectified current equal to thirty.

In this case, presented in FIG. 3 designations "a", "b", "с", as well as "x", "y", "z" with the corresponding indices 1, 2, 3, 4, 5 correspond to the phase notation generally accepted in electrical engineering (a, b, c) and (x, y, z) three-phase winding.

The numerical value of the angle to the left of the corresponding polygon, for example, 12 °, indicates a shift of the angle relative to the adjacent polygon (phase), in this case 12 °.

Presented in FIG. 2 and 3 of the power supply circuit of the windings of the engine 29, it follows that the connection of the phases of the valve winding to the motor 29 is carried out using groups of converters 30, 31 and 32.

In addition, each phase of the engine 29 through these converters is connected to five parts of the valve winding of a multiphase transformer.

So the phase "a" of the engine 29 is powered from the parts of the valve winding 33, 34, 35, 36 and 37. At the same time, one of the above-mentioned parts of the valve winding, in particular part 36, has a delta connection circuit, and the remaining parts of the valve winding ( 33, 34, 35 and 37) are connected in hexagons.

Phase "b" of the engine 29 is powered from parts of the valve winding 38, 39, 40, 41 and 42, One of the above parts of the valve winding, in particular part 40, has a "triangle" connection circuit, and the remaining parts of the valve winding (38 , 39, 41 and 42) are connected in hexagons.

Phase "c" of the engine 29 is powered from the parts of the valve winding 43, 44, 45, 46 and 47. At the same time, one of the above-mentioned parts of the valve winding, in particular part 45, has a delta connection circuit, and the remaining parts of the valve winding (43 44, 46 and 47) are connected in hexagons

When a multiphase transformer is operating, the shift between the phases of the same name within each of the five parts of the circuit that feeds the corresponding phase of the engine 29 is 12 °, which provides a pulsation of 30 (360 ° / 12 ° = 30).

In this case, all parts of the valve winding are made of the same type of wire, do not require soldering processes that serve as a necessary element in the "triangle with extended sides" scheme (see Fig. 1).

All of the above will ultimately significantly reduce the complexity of manufacturing the valve winding of a multi-phase transformer, simplifying its manufacturing process, without increasing the consumption of wires compared to the known similar valve winding of a three-bar transformer.

Due to significant advantages in comparison with the known similar multilayer windings, the inventive valve winding of a three-bar transformer has wide possibilities for its practical application in the future.

Literature:

1. Magazine “Electrical Engineering News”, No. 2 (32), 2005, “High-voltage converters for variable frequency drives. Construction of various systems. Author Grigori Lazarev, Ph.D., Corresponding Member AEN RF, head. Electric drive laboratory of the Scientific and Research Institute of Electric Power Industry OJSC (VNIIE OJSC), Moscow.

Claims (1)

The valve winding of a three-core transformer designed to provide "n" pulsations, where n is an integer multiple of six, containing in each phase an equal number of parts placed in equal quantities on the cores of the magnetic circuit, while one of the parts has a delta connection that differs in that the remaining (n-1) parts are connected in hexagons inscribed in a circle, the diameter of which depends on the voltage of the part connected in a triangle, the parallel sides of the polygons are parts located on one rod, and the magnitudes of the stresses of these sides are proportional to their lengths.

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