RO128573A2 - Three-phase transformer for continuous voltage regulation - Google Patents

Abstract

The invention relates to a three-phase transformer with mobile short-circuited coils for the continuous voltage regulation under load conditions. According to the invention, the three-phase transformer comprises three single-phase modules () with columns, on one column there being mounted a primary winding, divided into two serially connected sections (), another mobile short-circuited winding () being placed concentrically therewith and movably between the column extremities, where the primary winding is serially connected with an auxiliary coil () employed for correcting the voltage in the zero position of the regulation system; the said three modules () are joined in a star-shaped radial cores assembly, where the columns carrying the main windings are mounted next to each other and some mobile short-circuited coils () are fixed between two support plates () of bevelled apex triangular shape, the resulting assembly sliding along some guides () placed in the apices of an equilateral triangle, driven by a screw shaft (), by means of a handling wheel ().

Description

The invention relates to a three-phase transformer with movable coils in short circuit, for continuously adjusting the voltage under load. The three-phase transformer according to the invention consists of three single-phase modules (M1, M2, M3), with columns; on one of the columns is mounted a primary winding, divided into two sections (2, 2 ') inserted, concentric with the first winding, another movable winding (3) is placed, in short, displaceable between the ends of the column, and the primary winding is inserted an auxiliary coil (4), used to correct the voltage at position 0 of the control system; the three modules (M1, M2, M3) are assembled in a star-shaped radial core assembly, where the main winding columns are mounted side by side, and short (3a, 3b, 3c) movable coils are fixed between two support plates (5, 5 '), triangular in shape, with the pointed edges, the assembly made by sliding on some guides (6, 6', 6) arranged at the ends of an equilateral triangle, being driven by an axis (7) threaded, by means of a handle (7 ') for handling.

Claims: 2

Figures: 3

Starting from the date of publication of the patent application, the application provides, provisionally, to the applicant, the protection conferred according to the provisions of art.32 of Law no.64 / 1991, except in cases where the patent application has been rejected, withdrawn or considered as withdrawn, the extent of the protection conferred by the patent application is determined by the claims contained in the application published in accordance with article 23 paragraph (1) - (3).

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Three-phase transformer for continuous voltage adjustment

The invention relates to a three-phase transformer with movable coils in short circuit, for continuously adjusting the voltage under load.

for the purpose of continuous voltage regulation, a solution is known (BACIU, I .; BUZDUGA, C; NIȚAN, I; OLARIU, ED; ROMANIUC, I; CERNOMAZU, D. Three-phase transformer for continuous voltage regulation. Patent application of Invention no. A / 01238, from 25.11.2011 OSIM, Bucharest.) consisting mainly of three single-phase modules, each module representing, in fact, a single-phase transformer with columns, where on one of them is mounted a primary winding, divided into two identical sections, placed at the ends of the column. On the same column, in a concentric position is mounted a movable winding in the short circuit, displaceable between the extremities of the column by an appropriate drive system. the primary winding is inserted, on each phase, with an auxiliary winding placed on another column and meant to correct the voltage value at the position of "0". The three modules, which are in parallel positions, are assembled together by a properly sized and designed clamping system.

The disadvantage of the described solution lies in the fact that the system of mobile coils in the short circuit, as a result of the arrangement of the component modules one after the other, is lacking in compactness, which implies an exaggerated consumption of materials and a considerable increase of the dimensions.

The technical problem solved by the invention consists in the development of a compact system for mounting and actuating the mobile windings in the short circuit.

The three-phase transformer for continuous voltage adjustment, according to the invention eliminates the mentioned disadvantage by consisting mainly of three single-phase modules assembled in a star-shaped radial core assembly, where the main winding carrier columns are mounted next to each other. another and the movable coils in the short circuit are fixed between two support plates of triangular shape, with the blunt ends, the assembly made by sliding on some guides arranged at the ends of an equilateral triangle in ^ - 2 0 1 1 - 0 1 2 8 0 -3 0-11 - 2011 while it is driven by a threaded shaft through a rosette, both elements being placed on the vertical axis of the transformer.

The invention has the following advantages:

compact construction;

constructive simplicity;

reduced consumption of materials;

safety in operation.

The following is an example of embodiment of the invention in connection with FIG. 1, FIG. 2 and FIG. 3 which represents as follows:

Fig.l - principle electrical diagram of the transformer;

Fig. 2 - a cross section through the transformer;

Fig. 3 - a longitudinal section through the transformer.

The three-phase transformer for continuous voltage regulation, according to the invention (fig. 1 and fig. 2), consists mainly of single-phase modules Ml, M2 and M3, assembled in a spatial assembly, with radial orientation.

Each module represents, in fact, a single-phase transformer with columns at, lb respectively and where one of the columns is mounted a primary winding divided into two identical sections (2a, 2'a); (2b, 2'b); (2c, 2'c). On the same column is placed a mobile winding in short circuit 3a, 3b and 3c. the primary windings are fitted with an auxiliary coil 4a, 4b, 4c placed on another column and used on to compensate for the residual voltages when the transformer is in the "0" position. The carrier columns of the primary windings are assembled at the center in a radial orientation in the form of a "star" shape.

This arrangement offers the possibility of grouping in a compact assembly, the movable coils, in short circuit, 4a, 4b, respectively 4c. For this purpose the three coils are fixed between two electrically insulating plates 5 and 5 ', having the form of equilateral triangles with the blunt ends. The obtained assembly slides on guides 6, 6 ', 6, also arranged at the ends of an equilateral triangle and is actuated by a threaded axis 7 integral with a handle 7'. The three modules are joined by a powerful clamping and fastening system consisting of special shaped yokes associated with properly designed clamping bolts and not shown in the figure.

The three-phase transformer for continuous voltage regulation, according to the invention can be reproduced with the same performances and characteristics whenever necessary, which can be an argument in favor of meeting the criterion of industrial applicability.

Claims (2)

claims 1. Three-phase transformer for continuous voltage regulation, operating on the principle of short-circuit mobile coil transformers, characterized in that it consists mainly of three single-phase modules (Ml), (M2) and (M3), each representing in fact a single-phase transformer consisting of a magnetic core with columns (1), where a primary winding is mounted on one of the columns, divided into two series sections (2) and (2 ') and which modules (Ml), (M2) and (M3) are assembled into a star-shaped radial core assembly, where the bearing columns of the main windings are mounted side by side; concentric with the first winding, there is placed a winding, movable, in short circuit, (3), movable between the ends of the column by means of an assembly formed by two support plates of triangular shape with the pointed ends (5) and (5 ') and which assembly slides on guides (6), (6) and (6 ') under the action of a threaded shaft (7) that makes common body with a handle (7'). Transformer according to claim 1, characterized in that the primary windings are divided into sections (2a), (2a '); (2b), (2b '); (2c), (2c ') coupled with some auxiliary windings (4a), (4b), respectively (4c) having the role of correcting the voltages at the "O position" of the control system and which primary windings are connected by the star connection. and are connected to a three-phase power supply; voltage regulation is achieved by moving the assembly formed by the three movable coils in the short circuit (3 a), (3b) and (3c) between the ends of the columns related to the magnetic system assembled in a radial orientation space assembly.