SU780059A1 - Transformer with regulating voltage under load - Google Patents

Description

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The invention relates to power engineering and can be applied in voltage-controlled transformers under load.

A transformer is known in which stepwise voltage regulation is performed under load 1. Moreover, switching from one stage to another without breaking the circuit is performed through a current-limiting reactor. The disadvantage of this is that the devices are large in size and the lack of voltage regulation inside the stage. .

A transformer with smooth voltage regulation 2J is known. The transformer has an armor structure, its middle core, carrying the secondary winding, allows smooth axial movement.

Its disadvantage is the large dispersion and complexity of the design.

A transformer with voltage regulation under load is known, which contains an adjusting winding with taps from the control stages with fixed contacts, a winding mounted concentrically relative to the adjusting winding, movable along it, and current-collecting elements HZ. In this transformer, the voltage is adjusted by sliding the brushes, along the contact path of the adjusting autotransformer winding, or by switching the switch from the control windings. The movable winding is used to compensate for the magnetizing force of the adjusting winding.

10 This technical solution is the closest to the invention of the technical nature.

The disadvantage of the transformer is the large size, due to the fact that the control range is determined by the height of the adjusting autotransformer winding. Such transformers, due to the differences in the autotransformer winding, are manufactured at limited capacities. And there is a small range of voltage regulation. .-;

The purpose of the invention is to expand the range of voltage regulation

25 and reducing the size of the transformer.,

This goal is achieved by the fact that a transformer with regulation of voltage under load, containing

ZS adjusting winding with taps

from the adjustment stages with fixed contacts, the winding mounted concentrically with respect to the adjusting winding, movable along it ,, and latch elements, is equipped with a stand mounted along the adjusting winding, on which the fixed contacts are placed, contacting with current-collecting elements with a movable winding located above the surface adjustment windings: Winding, wound with a bare wire opposite the adjustment winding, while the fixed contacts of the adjustment winding are located on the

Standing equal to the height of the movable winding with the number of turns equal to the number of turns of the step of adjustment.

The transformer may have current collection elements mounted on the movable winding.

The transformer may have collector elements mounted on the fixed contacts of the control winding,

The transformer may have a current-collecting ring with a current-collecting brush rigidly connected with a movable winding installed with the possibility of an additional rotational movement around the centrifugal axis. In the latter case, an increase in the level of voltage regulation is achieved.

FIG. 1,2,3,4,5,6,7,8 depicts a part of a transformer design with voltage regulation under load and a circuit for connecting windings in various versions.

The transformer contains a magnetic core 1, an adjusting winding 2, a rack 3 with fixed contacts, a movable winding 4.

The adjusting winding 2 has taps from the adjustment steps, the taps end with 3j | eKTpH4ecKHMH contacts that are fixedly mounted on the rack 3, and the stand is installed along the windings 2, 4. The moving winding 4 is a spiral single-layer coil wound with a bare wire over the adjustment winding. The movable winding 4, in turn, alternately closes the control stages, while in the circuit formed by the winding of the control stage and the mobile winding, the balancing current does not flow, since these windings and There are the same number of turns and are turned on.

In Fig, 1, 2, 3 shows a transformer containing the collector elements 5, b, mounted on the movable winding 4.

In the working position, the movable winding through the collector elements 5, for example knives, is connected to two tapes of the adjusting winding, i.e. parallel to one step of adjustment

A current collection is carried out through a movable TBsobnoe element 6, for example a brush. As the voltage at the output of the transformer increases or decreases, the removable brush 6 moves along the bare turns of the moving winding 4 up or down until the voltage recovers, thereby smoothly adjusting within one step.

For the purpose of continuity, the load current, at the moment of switching the movable winding 4 to the next step of adjustment, the current-removal brush B remains stationary and closed simultaneously with the movable winding 4 and the fixed contact of the transformer desolder located on the rack 3.

FIG. 4, 5 depict a 1transformer containing current collection elements 7 mounted on stationary contacts of the rack 3, onto which taps of steps of adjustment of the control winding are led. Possessively moving, the movable winding 4 slides over the collector element 7, for example, a contact brush, thus changing the number of turns connected in series to the tap-off of the adjusting winding, and thereby controlling the voltage inside the stage. At certain points in time, the movable winding 4 slides simultaneously along two current collection elements simultaneously. In this case, the movable winding 4 is connected in parallel with the step of adjustment.

FIG. b, 7, 8 shows a transformer containing a current collection ring 8 with a current collecting brush 9. A current collecting ring is rigidly connected to a movable winding. In order for the current-collecting ring not to leak current from the induced EMF in it, it consists of several parts that are isolated from one another. Each part of the collector ring is connected to the same end of the coil. For the purpose of the continuity of the load current, the insulating gap between the conductive parts of the collector ring is selected Less than the width of the collector brush. The number of conductive parts of the collector Ring is chosen from such a condition that the amount of current flowing through the connecting conductors at the moment when the two conductive parts of the ring are simultaneously touched by the collector brush would be less than the allowable current value for the connecting conductors.

Claims (3)

The movable winding 4 is different from the cases shown in FIG. 1,2,3 and figs. 4, 5, the presence of an additional rotational movement, so that the bare wire of the winding 4 slides along the current collector elements 7 along a helical line, and thus the smoothness of the voltage regulation is increased. . The advantage of the invention lies in the fact that the regulation of the voltage under load is accomplished by switching the stages of regulation and by smoothly varying the voltage within the whole range of regulation of the transformer. The invention can be applied both in single-phase and multi-phase transformer. In a single-phase device, the movable winding can be wound either over the transformer windings or on a rod free from windings. In the invention, the control of voltage under load is carried out without the use of special current-limiting reactors, and, in addition to the consumption of a transformer, 5-7% of electrical materials (copper steel) are consumed. Compared to a transformer regulated under load by moving a current-collecting brush over the autotransformer winding, the invention significantly reduces the cost of manufacturing a transformer, makes the control range of transformer dimensions independent, allows the moving winding to be made with a thicker wire and thereby bake both reliable current collection, increase durability and expand the power range of continuously adjustable transformers. Claim 1. Transformer with voltage regulation under load, containing an adjusting winding with taps from control stages with fixed contacts, a winding mounted concentrically relative to the adjusting winding, movable along it, and current collecting elements, characterized in that, for the purpose of expansion range of adjustment and downsizing, the transformator is equipped with a stand installed along the adjusting winding on which fixed contacts are placed in contact with osemnyh elements with movable windings situated on top of the adjustment windings, oppositely wound bare wire adjusting the coils, wherein the fixed contacts of the regulating winding are arranged at a distance equal to the height of the movable coil with a number of turns equal to the number of turns of adjusting steps. 2. Transformer according to claim. 1, distinguished by the fact that the collector elements are mounted on a movable winding. 3.Transformer according to Clause 1, which is based on the fact that the current collection elements are mounted on the fixed contacts of the control winding. 4. Transformer on PP. 1 and 2, differing from the fact that, in order to increase the smoothness of regulation, the transformer is equipped with a current collection ring with a current collecting brush rigidly connected to the movable winding, and the movable winding is installed with the possibility of additional rotational motion around the central axis. Sources of information taken into account in the examination 1. Petrov G. N. Electric machines tom. 1, M., Energie 1974, p. 112 2. Petrov G. N. Electric machines tom. 1, M, Energy 197.4 g. With. 181. 3. The patent of the Federal Republic of Germany 1281544, k.g21a 53/0, 1968 f (/2./ Riv.z  fputl J -V