SU1458863A2 - Regulating member of a.c. voltage stabilizing apparatus - Google Patents

Abstract

The invention relates to electrical engineering, in particular, to converter technology, and may not be used in alternating voltage stabilization devices. The goal of an isbrateny is to eliminate self-oscillations and reduce costs. During operation of the thyristor switches 6 and 7, high-frequency currents occur, which create an unacceptable level of radio interference. LC circuits are used to attenuate them. One serial circuit formed by a capacitor 11 and a winding 2-3 of the autotransformer I, through a parallel circuit formed by a capacitor 12 and a coil 13, is connected in parallel to a thermal switch 6. Another serial circuit formed by a capacitor 11, a winding of 3-4 autotransformers 1 and choke 8 through a parallel circuit 12,13 is connected in parallel to the thyristor key 7. All three circuits must have a resonant frequency close to the lower limit of the frequency range. In addition, for high frequency currents that occur at. the operation of thyristor switches 6 and 7, in the entire frequency range, the resistance of the serial circuits in combination with the parallel circuit is small. Capacitors 9 and 10 provide an additional reduction in radio interference, while the capacitances of these capacitors are reduced. 1 il. CO 4; Ate 00 00 O) with / 5 N)

Description

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The invention relates to electrical engineering, in particular, to converter technology, and can be used in alternating voltage stabilization devices.

The purpose of the invention is to eliminate self-oscillations and reduce the cost of the device.

The drawing shows a diagram of a regulator of an alternating voltage stabilization device.

The regulator of the alternating voltage stabilization device contains an autotransformer 1 with output, common and adjusting taps 2-5, low 6 and top 7 thyristor keys, choke, 8, cond, sensors 9-1 2 and inductance coil 13. The common connection point of the thyristor switches 6 and 7 and the capacitors 9 and 11 is connected to the output terminal 14. The coil 13 and the capacitor 12 form a parallel LC circuit. A common connection between the parallel LC circuit 12, 13 and the capacitors 10 and 11 is connected to the output terminal 15.

The regulator organ of the stabilization device works as follows.

At the beginning of each half-cycle of the input voltage, the thyristor key 6 and the autotransformer 1 operate in the underdrive mode. Then, at a certain point in time, depending on the magnitude of the input voltage, the thyristor key 7 is turned on, and the thyristor key 6 is closed, and autotransformer 1 works in a higher mode. When the thyristor switches 6 and 7 are in operation, high frequency currents occur, which in the range of 0.15 to 0.30 MHz create an unacceptable level of radio interference. For their weakening, LC circuits are used: two serial and one parallel connected in series into the common circuit of serial circuits. One series circuit formed by a capacitor 11 and a winding between taps 2-3 autotransformers. Matora 1, through a parallel circuit formed by a capacitor 12 and a coil 13, is connected in parallel with a thyristor switch. Another sequential circuit formed by a capacitor 11, winding between taps 3-4 of the author of the transformer

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and the choke 8, through a parallel circuit 12, 13 is connected in parallel to the thyristor switch 7. All three pins must have a resonant frequency close to the lower limit of the frequency range, i.e. on the order of 0.15 MHz. . At the same time, for high aastota currents, which arise when thyristor switches are in operation, in the whole frequency range the resistance of successive circuits in combination with a parallel circuit will be small. As is known, the condition for the resonance of any circuit is the equality of the inductive and capacitive impedances WL -. In this case, the overall resistance.

contour close to zero. For currents of higher frequency than 0.15 MHz, the inductive resistance of the windings between the taps 2–3 and 3–4 of the autotransformer 1 and the winding of the drossel 8 increases, and the capacitance of the capacitor 11 drops. However, the phenomenon close to resonance is not disturbed, since the current through parallel circuit 12, 13 is capacitive in nature. This is because the inductive resistance of the coil 13 increases, and the capacitive impedance of the capacitor 12 drops. However, the total capacitance of the capacitors 11 and 12 increases, providing a minimum total resistance with the inductance of the windings. The capacitors 9 and 10 included in the input and output play an auxiliary role, providing an additional reduction of radio interference, they exceed a predetermined value due to the difficulty of meeting the requirements of the resonance due to the difference in inductances of the windings between the taps of 2–3 and 2–4 autotransformers. 1 and throttles 8, which are determined solely by the design requirements, as well as due to the technological variation in the capacitances of the capacitors of the inductances of the throttles 8, autotransformer 1 and coil 13. However, the capacitances of these capacitors are reduced: capacitor 9 5 - 10 times, capacitor 10 10-50 times. Self-oscillation proce, ssy completely. exclude. When using capacitors P, 12 and coils 13 with times 1458863-I

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;,: ™ GG EH- on auth. St. ff 1141387, distinctive conclusion.

Claims (1)

claims Regulating body of the device for stabilization of alternating voltage according to ed. St. No. 1141387, with the aim of eliminating the parallelism with the fact that, in terms of self-oscillations and bridges, an LC circuit is inserted into it, which is included in the gap between the output branch of the autotransformer and the common point connecting the third capacitor to the output terminal.