RU1823020C - Three-phase converter transformer - Google Patents

Abstract

Eastzonanie: about electrical engineering. SUBSTANCE: formator contains a magnetic wire 1, network 2 and valve 3 windings. The last splitting of the foam into two parts: 4 - connected in a triangle, 5 - connected in a star. Il inputs 6, 7, O of the part and loops 9 are located. 10, 11 with high magnetic permeability with windings 12,13, 14. Similarly, on the sleeves 15, 16, 17 of part 5 loops 18, 19 are located. 20 with windings 21, 22 , 23. All the circuits of the dc voltage are formed by voltage-boosting transformers, which allows to reduce the current imbalance of the converters, there are no ignition delay angles of smallpins, which eliminates voltage distortion of the supply voltage. 2 ill. (L s 00 N3 CA) O GO O

Description

 / og / LagAsg

 / 1 lg-f

B 15 15 P

Fig /

The invention relates to electrical engineering, in particular to powerful three-phase converter transformers with split valve windings.

The aim of the invention is to reduce reactive power consumption, increase efficiency and reduce material consumption.

In FIG. 1 is a schematic representation of a three-phase converter transformer: FIG. 2 - vector diagrams of secondary voltages.

The transformer contains a magnetic core 1. the network winding 2 and the valve winding 3, split into two parts: 4 - connected by a triangle and 5 - connected by a star.

The number of turns in part 4 is five, and in part 5, three (their ratio is 5/3).

On the inputs 6, 7, 8 of part 4 are loops 9, 10, 11 with high magnetic permeability (for example, when they are made of electromagnetic steel, the magnetic permeability is 500-3000) with windings, respectively, 12, 13, 14. Similarly, on the inputs 15, 16, 17 of part 5, circuits 18, 19, 20 of electrical steel with windings 21, 22, 23 are located.

The windings 12, 13, 14 of circuits 9, 10. 11 located on the inputs 6, 7, 8 are connected to the inputs 15, 16, 17 of part 5, and the windings 21, 22, 23 of the circuits 18, 19, 20 are connected to the inputs 6 , 7, 8 parts 4.

When a transformer is connected without circuits 9, 10, 11, 18, 19, 20 to the mains, the linear voltages of parts 4 and 5 are separated by 4% due to the discreteness of the turns.

In order to equalize the open circuit voltages, in part 4 with a lower voltage, it is necessary to increase the voltage by 2%, and in part 5, to decrease by 2%. This function is also performed by circuits 9, 10, 11, 18. 19, 20, which, together with windings 12, 13, 14, 21. 22, 23, are essentially boost boost transformers.

When connecting the windings of the circuits located at the inputs of one part, -. line voltages of parts with a different wiring diagram - see the secondary voltage diagrams of FIG. 2, the linear voltages of the parts change only in magnitude, remaining unchanged in phase (a change in the phase of the voltages would lead to a deterioration in the characteristics of the

development point of view

phase reduction rectification).

In addition, when performing the transformer according to the claimed solution, the imbalance in the currents of the converters is excluded for any values from zero to nominal: there are no ignition delay angles for the valves, which eliminates distortion of the supply voltage by higher harmonics.

Claims (1)

The claims A three-phase converter transformer containing a magnetic circuit, a network winding and a valve winding split into an even number of parts. one half of which is connected according to the star pattern, and the other half - according to the triangle pattern, and the number of turns of the part connected to the triangle is n times the number of turns of the part connected to the star, where 5/3 p 2, as well as the contours of the material with high magnetic permeability, each of which is equipped with a winding, which are located on the inputs of the parts of the valve coil, are distinguished by the fact that, in order to improve technical and economic indicators by reducing the consumption of reactive power, increase efficiency and reduce material consumption, as circuits from material with high magnetic permeability, booster transformers are used, and windings of booster transformers located at the inputs of parts with one wiring diagram, electrically connected to inputs of parts with another wiring diagram. Va lt