SU752669A1 - Three-phase voltage source - Google Patents

Description

put through the 3N terminals from the second one, and the position of the slider of the first switch on the 1st terminal corresponds to the position of the analogous slider of the second switch on (i + 4N) and the third on (i + 2N) terminals, and the magnitude of the change in the angle between the direct voltage and the reverse sequence is determined by the shape of 360 °

le n

In addition, the proposed device is characterized in that the two-phase voltage converter in the 6Y-phase is made according to the autotransformer circuit.

FIG. 1 shows a functional diagram of the source for N 2; in fig. 2 shows the vector diagrams (a, b, c, d) of the BS-phase voltage for four values of L.

The three-phase voltage source contains a two-phase voltage generator 1, two-phase voltage converters 2 and 3 three-phase and 12-phase, respectively, and switch 4. Both converters are made on multi-winding transformers Tr1-Tr3 and Tr4-Tr9, the number of turns of the primary windings of which correspond modules vertical and horizontal components, their vectors in the diagram of FIG. 2, b. The output potential of the output windings, denoted by letters am, relative to the second conclusions correspond to the ends of the 12-phase voltage vectors, denoted by the same letters. Switch 4 consists of three switches P1, P2, PZ for 12 positions each. All engines are electrically isolated and fixed relative to each other, so that in each switch one engine is located six terminals away from the other, and the position of engine 111-2 on the i-th terminal corresponds to the position of engine P2-2 on (t-b8), ПЗ-2 on (ti-4) terminals.

The two-phase voltage of the generator 1 is converted into converters 2 and 3, respectively, into a three- and 12-phase symmetric voltage. When indicated in FIG. The 1 position of the switches P1, P2 n PZ to the three-phase voltage r, 3, m and converter 2 phase-wise three-phase voltage r 3, 3, 3 are added (due to the series connection of the windings).

These three-phase voltages are used as components t / i and 1/2, since the alternation of their phases at the output terminals A, B, C of the source, respectively, is direct and reverse. If you take phase A for

L / i and L / 2 corresponding to vector 2, then in this case the angle between the systems of direct and inverse sequences is f2.1 0. When the sliders rotate to the next position (but clockwise) to the voltage r, 3, m converter 2, phase

The voltages v, l, l of converter 3 are added. In this case, phase A for Uz corresponds to vector v, i.e. f2.1 30. Switching the sliders P1, P2, PZ to the next position will entail changing the parameter f2.1 by 30, etc. Thus, using switch 4, a discrete change in parameter F2.1 is carried out, and twelve of its positions can be calibrated directly in degrees. Adjusting the amplitude values of the output voltages of the converters 2 and 3 and, therefore, the modules ill and (/ 2 can be accomplished in various known ways, for example, a module and by changing the output voltage of the generator 1, the Uz module by changing the transformation ratio Tp4-Tp9 ,

if the output of the latter is the last for the autotransformer.

The number of phases of the output voltage of converter 2, a multiple of 6, is explained by the vector diagrams in FIG. 2, a, b, c, g

It can be seen from them that for each 6N-phase voltage vector it is possible to find two others, turned at angles of + 120 ° and -120 relative to the selected one. As a result, 6N-phase voltages can be considered as a set of three-phase voltage systems rotated relative to each other.

Scream

friend in the plane of the vectors at the angle -, -.

6L

The addition of a well-known three-phase voltage source with a two-phase voltage converter to 6iN-phase and a switch allows increasing the functionality and extending its range of application. A significant advantage of the source is the possibility of directly setting the three-phase asymmetry parameters, and also, as is easy to show, multiphase voltage systems. This significantly reduces the time required to set parameters and improves the manufacturability of work associated with the use of this source.

Claims (3)

1. A three-phase voltage source containing a two-phase voltage generator connected in series and converting a two-phase voltage to a three-phase multi-winding transformer, the zero output of which is a source zero input, characterized in that, in order to regulate the reverse sequence voltage and the angle between voltage forward and reverse order, it is equipped with a switch consisting of three switches with two mechanically interconnected sliders, each th of which 6L positions where, 2, 3 ... and an adjustable two-phase voltage converter to 6Y-phase, made on multiwinding transformers, each output terminal of this converter connected to the corresponding terminal of each switch, first, second and third output terminals of the other converter to the first sliders of the first, the second n of the third switch, the second sliders of which are output terminals, the first slider of each switch is located through 3yV terminals from the second and position of the slider of the first switch bodies at i-position of the terminal corresponds to a similar engine on the second switch (MS-4 / V) and the third to the (i + 2N) terminals, wherein the amount of change of the angle between the voltages of forward and reverse sequence was determined by the formula: 360 ° 6N 2. The source of the three-phase voltage under item 1, characterized in that the two-phase voltage converter in the 6Y-phase is made according to the scheme of the autotransformer. Sources of information taken into account in the examination 1. The patent of Romania No. 48177, cl. 21 e 36/04, 1976. 2. USSR author's certificate number 457152, cl. H 02. 5/14, 1976. x.a F / Y. "  tv. g / // Put.Z