SU7915A1 - Device for changing the voltage in the AC circuit - Google Patents

Description

The present invention relates to devices for varying the voltage in an alternating current circuit with the help of day-switched transformers with iron saturation control.

In FIG. 1 depicts the scheme of the proposed device in the case of a single-phase circuit; FIG. 2 is the same device in the case of a three-phase circuit.

The proposed device consists of two transformers, which are included in the AC price, so that their nervous windings 1,1, 1, I, connected to each other in series, reach the source of voltage; Secondary 2, 2, 2, 2 windings, also interconnected in series, are included in the common circuit. Both transformers are the same. The direction of the windings is such that, at the same magnetic state of the cores, the electromotive forces induced in the secondary windings cancel each other out. The difference in magnetization creates a difference in the electromotive forces and, therefore, an increase or decrease in the voltage in the common circuit. To change the saturation wall on the cores, additional magnetizing windings are inserted to which a steady (or alternating) current is sent, the value of which can be controlled by one of the known methods (variable resistance, Morse key, electronic lamps, etc.) by hand or automatically . To avoid inducing currents in magnetizing windings, one of the known methods of compensation-magnetic or electric can be used. However, it is possible to make transformers with a third core, on which the magnetizing winding is located.

FIG. 1 shows a diagram of such a device. G and T. - transformers with third (middle) cores carrying magnetizing windings 3–3, driven to a source of a constant current B: the current values in windings 3 and 3 are distributed in a differential manner (potentiometer). Depending on the contact position K of the resistance a, the ratio of the currents in the magnetizing windings of the transformers c is determined, hence the degree of magnetic saturation. Instead of the resistance R, differential-electronic relays can be included, the voltage in the chain of grids of which can be regulated by one of the known methods. The numbers .1, 2-2 designate the nervous and secondary windings of both transformers.

FIG. Figure 2 shows schematically the same device for multiphase current (in the diagram, the three-phase Toa nrimer). Here, a special compensation device is not required, since the magnetizing winding distributed on the three cores consequently gives, as is known, the resulting induced electromotive force equal to zero.

The Molget device will be used to change the amplitude of the high-frequency current of the radio telegraph and radiotelephone non-emitter stations, as well as for messages with high currents. frequencies. In the case of application of lamella (electronic) generators, the described device is included either at the anode price, or at the grid, or at the coupling organs of the oscillating circuit with the value of the grid (both at self-excitation and at independent excitation). As a differential tool for controlling the degree of saturation of the cores of both transformers, there can be a Morse key with two contacts, a microphone with a differential microphone transformer, electron tubes that are included differentially, amplifiers, and so on. In the same way, the pitch variation of the high-frequency current for tone telegraphy can be reproduced.

The subject of the patent.

A device for varying the voltage in the field of temporary current through the help of transformers connected to the circuit with iron saturation regulation using direct current, characterized by the use of two transformers, each of which are provided with three kinds of windings located on three cores, of which one is 2, 2, ,, 2, 2 are connected in series with each other and are consistently included in the price of non-current current the other windings 1, G, 1, 1 are interconnected in series and included in the branch parallel to the value of the alternating current to be regulated, and the third windings 3, 3, located on the same middle (Fig. 1), in the case of a single-phase circuit, or on all three cores (Fig. 2), in the case of a three-phase circuit, are connected to a direct current source through a regulating device so that, when controlled, the current increase in the winding of one of the transformers corresponds to a decrease in the current in the winding of the other.

FIG. but.

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