SU1372390A1 - Three-phase variable transformer - Google Patents

Abstract

The invention relates to electrical engineering, namely adjustable transformers. The aim of the invention is to expand the adjustment possibilities. An adjustable transformer contains a symmetrical spatial magnetic core consisting of 3 rods 1, two extreme rm 2, 3 and middle rm 4, the primary winding with coils 5-7 placed on the middle rm, two secondary windings, coils of one of which are 8 -10 are placed on the rods on one side of the middle shell, and the coils 11-13 on the rods on the rods on the other side of the middle shell and the left of the group of bias windings 14 and 15. The primary winding can be connected to a triangle or a star. I 3.p.f-ly, 7 Il. with $

Description

(L

W

The invention relates to electrical engineering, namely adjustable transformers.

The purpose of the invention is to expand the adjustment capabilities by providing additional control over the phase of the secondary voltage.

FIG. 1 shows a diagram of a three-phase regulated transformer; in fig. 2-6 are winding connection diagrams; in fig. 7 is a voltage vector diagram illustrating transformer operation.

ten

simultaneous magnetization of rm 2 and 3 leads to a decrease in the flow in both secondary windings. Correspondingly, the change in the magnetic flux of the emf of the corresponding windings. The voltage vector diagram (Fig. 7) is shown for the case of connecting the primary winding to a triangle, and the secondary one according to the phase regulator circuit (Fig. 4), where the voltage vectors are filled with the same numbers as the corresponding coils. When changing the lengths of the vectors 11-13 by winding

Three-phase adjustable transforming of rma 2 or / and vectors 8-10

the mat contains a symmetric spatial magnetic core consisting of three rods 1, extreme ppm 2 and 3 and middle pma 4, primary winding

by biasing the PM 3, the output voltage vectors Uj ,, change the magnitude and direction (phase).

Phase shift between per25 system

thirty

35

with coils 5-7 placed at average voltages and a system of secondary voltages (Dg) can vary from -30 ° with zero vectors 8-10 to +90 with zero vectors 11-13 (Fig. 7).

Thus, the presence of two secondary windings and the use of various schemes for their connection expand the transformer's adjustment capabilities, providing almost independent control of the magnitude and phase of the output voltage.

Claims (1)

1. Three-phase adjustable transformer containing a three-core magnetic core, primary and secondary three-phase windings and six bias windings, characterized in that, in order to expand the adjustment capabilities by providing additional control of the secondary voltage phase, the magnetic core is symmetrically spatial so that the ends and the middle of the rods are connected by two extreme and middle rmi, equipped with a second secondary three-phase winding, the primary winding is placed on the middle rom, the secondary The two windings are placed on the rods on opposite sides of the middle rom, each two coils of different secondary windings are connected in series, and the bias windings are placed on the sections of the extreme RM, and each three windings of the bias magnetized on one frame are connected in series and according. There are two secondary windings, coils 8-10 one of which are placed on the rods on one side of the middle rm, and coils 11-13 on the other on the rods on the other side of the middle rm, and two groups of windings 14 and 15 bias. The primary winding can be connected in a triangle or a star (Fig. 2). Every two coils of different secondary windings are connected in series. FIG. 3 shows a sequential and consonant connection of the secondary windings into a star, where the same-phase phase coils are connected in series and according to, and FIG. 4 - connection of the secondary windings into a star, where the opposite phase coils of the secondary windings are connected in series and according to. This scheme is most appropriate when using a transformer as a phase-regulating. FIG. Figure 5 shows the connection pattern of secondary windings of the zigzag type. The windings of the magnetization of each group are connected in series and according to (Fig. 6). The transformer works as follows. The excitation flow created by the primary winding 5-7 is branched in different directions on the rods 1 by inducing an emf in the secondary windings. Regulating separately the current in the groups of windings 14 and 15 of the magnetization changes the magnetic conductivity of the PM 2 or 3, which ensures the redistribution of the magnetic flux between the secondary windings. BUT 40 45 50 55 simultaneous magnetization of rm 2 and 3 leads to a decrease in the flow in both secondary windings. Accordingly, the change in the magnetic flux varies the emf of the respective windings. The voltage vector diagram (Fig. 7) is shown for the case of connecting the primary winding to a triangle, and the secondary one according to the phase regulator circuit (Fig. 4), where the voltage vectors are denoted by the same numbers as the corresponding coils. When the lengths of the vectors 11–13 are changed by means of the magnetization of the rome 3, the vectors of the output voltage Uj ,, change the magnitude and direction (phase). Phase shift between the system per2. An adjustable transformer according to claim. 1, characterized by the fact that the opposite phase coils of the secondary windings are connected according to. eleven 12 GZ Ck qpU2.3 eleven 9 (10) hell in (9) FIG. 2 eleven 12  / J YU 9CO) G 10 (8} ye (ff) fig L iz Vj C) ig.5 needles