SU1422298A1 - Three-phase phase regulator - Google Patents

Abstract

The invention relates to electrical engineering. The purpose of the invention is to expand the range of adjustment of the phase shift angle and improve the weight and size parameters of the phase regulator. Phase regulator contains the first tr-p 1. with the primary 6 and secondary 7 windings, the second tr-p 2 with the winding 3 connected to the mains supply and equipped with current-carrying elements 4 and 5, and the switching device 8, the Phase regulator allows you to adjust the phase shift angle is from -180 to 180 when the output voltage is constant by moving the current collection points from the current-carrying elements 4 and 5 with the phase voltage of the winding 7 changed by 180 with a phase shift angle of ± 120 °. The change in the sign of the angle is carried out by changing the order of connecting the phases of the winding 7 to the current conductor. water elements 5 winding 3 on the open. 5 ill., 1 tab. i (Л С

Description

four:

ke to to

CD

00

eleven

The invention relates to electroergytics and can be used for regulating the power flows of power systems, as well as for the 4th control of the modes of electrical systems.

The purpose of the invention is to expand the range of adjustment of the phase shift angle and improve the weight and size parameters of the phase regulator.

Fig. 1 shows a diagram of the connection of the windings in Fig. 2, a vector diagram of the voltages for one of the phase shifter controllers; Fig. 3: Dependence of the angle of regulation and the voltage taken from the current lead of a shielded element, from the voltage taken from another current lead;

Fig, 4 is a three-phase switch circuit

5 is a diagram of the connection of the windings of the phase regulator taking into account the switching device of the phase reversal of the secondary winding of the first transformer.

The phase regulator contains a main three-phase transformer 1 and an adjustment three-phase transformer 2, which has a winding 3 connected to a star and equipped with current-carrying elements 4 and 5 along the entire length. Transformer 1 has a primary winding 6, the phases of which are connected in a star and connected via output

A, c, with the current-carrying elements 4 of the same phases of the winding 3 of the adjusting transformer 2, and the secondary winding 7, the phases of which through the three-phase switching device 8 are connected to the current-carrying elements of the 5 opposite phases of the winding 3 of the adjusting transformer 2, the Current-carrying elements 4 and 5 can be made of any design depending on the requirements for the phase regulator device. The indices A, B, C indicate the beginning of the phases of the winding 3, to which the primary voltage from the power supply network is connected, the indices a, b, from the output terminals (phases) of the phase regulator, from which the secondary (output) voltage is removed.

The vector diagram (Fig. 2) shows the vector 9 of the primary phase voltage of phase A, the vector 10 of the phase voltage taken from the current-carrying element 5 of phase C of the winding 3 connected through the switching device 8 to the phase a

skeins 7 of the main transformer 1; phase voltage vector 11 of the phase P of the secondary winding 7 of the main transformer 1, vector 12 of the secondary (output) phase voltage of the phase A of the phase regulator, angle 9 of the phase shift between the primary systems Ud, Pb, Uc and secondary (output) ilg, Ug, Up Phasoregulator voltages.

The operation of a phasoreg ultor is considered by the example of a phase A device.

In accordance with the vector diagram (figure 2)

a "® ic, - ic. Given that

(one)

.but}

.

-P

+

Uss

j "70

(2)

where Uq is the secondary (output) voltage of the phase regulator; Uj is the voltage between the current collector 4 and the end of the winding 3 of the transformer 2,

Uj5 is the voltage between the current collection 5 and the end of the winding 3 of the transformer 2;

n - transformation ratio of transformer 1.

Transforming (2), the dependences of the stresses and l), v- from the angle 6 are obtained:

2 Uv

sin9;

(3)

0

and

3

-0),

(BUT)

where and 4

 sin (6o

- voltage between current collector 4 and end of winding 3 ff

at an angle

45

By phasing the voltage in (3) and (4) through the number of turns of the windings, one gets

- „qi

sinG;

(Behind)

W

)four

 - W .. sin (60 ° + e). (4a)

Accepted in expressions (3), (4)

 1, stress values are obtained 1) 35 and in relative units

four

See:

35

--sin b;

p-4z

(V)

four

- sin (60 °

+ e).

Obviously, the relative value of the primary (input) voltage of the phase regulator (mains)

 2

 ...

At an angle of 9 12Cf

 and

} 4 / n

in the formula

the voltage U (2) becomes negative. Here, the switching device .8 changes the voltage phase

and, at 180 ° and provides further about

angle control c.

The control of the movement of the current collection points from the current-carrying elements 4 and 5 of the transformer winding in accordance with formulas (3) and (4) ((For) and (4a)) can be manually and automatically controlled by the on-load tap-changer. The order of switching the on-load tap-changer is determined by the table of voltages (numbers of turns) on the connecting elements 4 and 5. To maintain the constancy of the module of the output voltage, it must be ensured that the voltage U

W ,,) o

and and, 5 (numbers of WITES W, 4

For each value of the adjustable angle E, the table shows the relative values of the voltages taken from the current-carrying elements 4 and 5 depending on the angle 9, and the ph.d. dependence of the angle g and the voltage U} 4 as a function of the voltage Ujj for the coefficient transformation ti n 1.

The calculated values of phase regulator voltages are given in the table.

//

Consider the operation of a phasoregulator in the range of adjustment in the angle b from 0 to 180. In this case, the ends of the phases of the winding 7 of the transformer 1 are connected to the current-carrying elements 5 of the winding 3 of the transformer 2 as follows: phase a winding 7 - to phase C winding 3, phase b - to phase A, phase c - to phase B. current collection points from current-carrying elements

4 and 5 in accordance with the table of voltages (number of turns), you can adjust the angle 0 in the specified range, while changing the phase of the secondary winding 7 of transformer 1 by 180 ° at an angle of 120 °, i.e. . connected to the current-carrying elements

5 the beginning of the phase winding 7.

35

The three-phase switching device 8 consists of two two-position three-phase switches,

g working synchronously. In the diagram I switch the device (in FIG. 4), the switching contacts 13 of the first switch and the contacts 14 of the second switch are indicated.

10 The adjustment of the angle d in the range from 0 to -180 is made similarly, only with a different order of connecting the phases of the winding 7 of the transformer 1 to the current-carrying elements 5 of the winding

15 of the transformer 2. To do this, you must first connect the phase a of the winding 7 to the phase B of the winding 3, phase b to the phase C, phase c to the phase A. The sign of the angle 9 is set either

20 when mounting a phase regulator or using a three-phase switch designed to change the order of connecting the phases of the secondary winding 7 of the transformer 1 to the current lead

25 elements 5 of the winding of the transformer 2, and connected between the switching device 8 and the current-carrying elements, 5, For the specified switch, you can use a two 30-position three-phase switch. In the diagram of a phasoregulator with this switch (FIG. 5), a three-phase switching device 15 is indicated.

Claims (1)

Invention Formula 35 A three-phase phase regulator containing two three-phase transformers, the first of which has a primary 40 and the secondary winding, and the second transformer has one winding, about the fact that, in order to expand the range of adjusting the angle of the shear angle and improve the mass 45 parameters, the winding of the second transformer is complete with the ability to control the number of turns and equipped with current-carrying elements, to which the primary and secondary windings of the first transformer are connected, while the phases of the first transformer located on one rod are connected to different phases of the winding of the second transformer 55 Pa, and the second The winding of the first trans. The transformer is connected via an additionally introduced three-phase switching device for reversing its phase. Then T 30 GBO to | 120 I 150 180 1.0 1.1547 1.0 0.577 O-0.577 -1.0 O 0.577 1.0 1.1547 1.0 0.577 O Phage. 2 Us, f.O 0.6 0.6 OL 0.2 hail - 120  90 - 60 - thirty ABOUT ol 7 R / J / f L-II-: 0.8 10 I fJonpir / n. 12 Phasing 7 / / J -ni 7 I gs 15 f five §