SU1248002A1 - Device for generating control signals in high-voltage lines - Google Patents

Abstract

The invention relates to electrical engineering and can be used to transmit signals of automatic frequency unloading. The purpose of the NIN invention is to increase the stability of the level of the generated signal and the efficiency. . Generators synchronized with the network 14–17 in the cal 9Ts of the 1st half-period of the mains voltage generate pulses. The command to generate signals is given by the command key 6, when it is opened, the enabling signal is sent to the element 10 from the power supply unit. The pulses to the input of amplifier 2 will start to come after the RS-9 trigger 9 is turned on, which can be triggered only by the first pulse generators. The generator must produce a pulse wider than the total lag time of the element And 10 and RS - trigger 9. Due to this, the pulse with the smallest angle will always be the first to pass. This eliminates the overvoltage on the capacitor: 4, as well as the different amplitudes of current pulses and voltages generated in the system, which ensures the most favorable mode of operation of the device, high reliability, and signal transmission distance. 1 z.p, f-ly, 2 ill. (L of s 1 00 About O K9

Description

The invention relates to electrical engineering and can be USED to transmit signals of automatic frequency unloading,

The aim of the invention is to increase the stability of the generated signal level and efficiency, improve the operating mode of the power components of the device by reducing the voltage on them, as well as improving speed and reliability.

FIG. 1 shows a schematic of the proposed device; in fig. 2 - chart it. work.

The device contains two opposite-parallel thyristors 1, control inputs of 2 pulses connected to the amplifier, and power terminals connected in series with the choke 3 and the capacitor 4. The indicated circuit is connected to the network. The device also contains an AND 5 element. A command switch 6 is connected via resistor 7 to power supply unit 8. RS-flip-flop 9 output is connected to the element And 5, triggering, the input is connected to the element AND 10. Resetting R-input of the RS-flip-flop 9 is connected to the element And P, one of the inputs of which is connected to the Element of the element HE 12. The element NO 12 is connected with a command switch 6. Parallel to the capacitor 4, a resistor 13 is connected.

The device also includes one of four synchronized with the generator network 14-17 pulses, the inputs of which are connected to the transformer 18 which is connected to the network by the primary winding. The outputs of the generators 14-17 are connected with. element OR 19, the output of which is connected to the element AND 5. The output of the first generator 14 is also connected to the input of the element AND 10, and the output of the last generator 17 to the input of the element AND P.

The device works in the following way.

Generators synchronized with the network, 14–17, in each half-period of the network voltage, the pulses are most preferred. Phase 4 pulses are approximately 14.5; 48.5; 131.5 and 165.5 °. In this case, when the first pulse (14.5 °) arrives at the thyristor I, an oscillatory process of charging the capacitor 4 occurs up to twice the magnitude of the network voltage at this moment (2 sin-14.5), i.e. up to 50%

S

0

five

5 o

55

0

five

0

five

50

network voltage amplitudes. A narrow pulse of about 10-50 microseconds is given to the thyristor 1. The pulse must be shorter than the half-cycle of oscillations of the LC circuit formed by condensation, torus 4 and inductance of droplets 3, taking into account the transformer, if it is used by connecting the power section of the device to the network. A resistor can be connected in series with the thyristor. As a result, due to the presence of a resistor, the charge of the capacitor may not be oscillatory, but aperiodic.

When a second pulse arrives (.48.5 °), the network voltage is 75%. As a result, capacitor 4 is charged. S to voltage 50 + 2 (75-50) 100%, i.e. to amplitude.

At the moments of arrival of pulses with phases 131.5 and 165.5 °, voltages of 50% and 0 are set respectively on the capacitor. Thus, in this case there are four currents of equal amplitude that are generated in the AC network. These pulses cause disturbance of the mains voltage and are fixed by the receivers.,. . ;

The command to generate signals yes-; There is a command key 6, when it is opened, the enabling signal is transmitted from the power supply unit to the And 10 cell. The impulses to the input of amplifier 2 will begin to come after the start of the RS-flip-flop 9. The latter can be started only by the first (14.5 °) pulse of the headers. In this case, the generator must produce a pulse wider than the total, the lag time of the element And 10 and the RS-flip-flop 9. Due to this, the pulse with an angle of 14.5 ° will always be the first. This includes overvoltage on the capacitor, as well as different amplitudes of current pulses and voltages generated in the system, which ensures the most favorable mode of operation of the device and high reliability and signal transmission distance.

After the completion of the formation of the signal: a, the command key 6 is closed and a zero signal appears at its output. However, control pulses will follow until element 11 of the signal turns off the RS flip-flop 9. The latter can only be turned off by the last (165.5 °) pulse,

As a result, the voltage on the capacitor 4 is zero. The input element And 11 receives signals from the generator 17 and the element NOT 12. A small residual voltage, which then remains on the capacitor 4 (due to losses in the circuit), is eliminated by the discharge resistor 13.

FIG. 2 shows n1 diagrams of voltage network Uj, capacitor U and control pulses Y.

. Similarly, increasing (decreasing) the number n of the generators 14-17 can form more (fewer pulses per period. At that, the phases of the pulses generated by the generators 14-17 are chosen so as to provide the same voltage spikes on the LC circuit. During transmission eight impulses for the period of the phase are equal to 3.6; .10.8; 18.2; 25.6; 34.2; 43.4; 54.3 and 69.6, etc., with a transmission of two pulses: phases are 30 and 150.

For a different number of n pulse phase generators 14-17, one can calculate by formula 4 ,. arcsin (- / dl

21-1,

i 1

n 2nd.

4-, 180 -arcsin () n

and

pulses, n

where 1 is a number is an even number 35

Lo pulse generators. The presence of the resistor 13 accelerates the removal of residual voltage from the capacitor 4, which improves the speed of the device.

The application of the proposed device makes it possible to form current-sized current pulses at minimum voltages on the power elements, to increase the efficiency of its operation, to increase the speed of formation of control signals, to increase the reliability of operation.

F. formula of invention

Claims (2)

1, A device for generating control signals in high voltage lines, comprising a circuit consisting ten 15 five 2480024 from the series-connected capacitor, throttle and a pair of counter-parallel thyristors and intended-. To connect between two wires - 5 high voltage lines. The power supply, the output of which is connected via a resistor to the first output of the command switch, the second view of which is connected to the common wire of the device, the first And element, the output connected through a pulse amplifier. with control inputs of a pair of anti-parallel thyristors, pulse generators, whose synchronization inputs are intended to be connected via a transformer to a high voltage line, and the outputs are connected via an OR element to the first inputs of the first Element And, characterized in that, in order to increase the stability of the generated signal and efficiency, improve the operating mode of the power elements of the device by reducing the voltage on them, it is equipped with an RS trigger, an element NOT, a second and third elements And - period of tension of high voltage line. The phase of the pulses generated by the pulse generators is determined. 21-1 is like H; arcsin - / dl n 2 dl 1 20 0 P  1 D V and H:  180 -arcsin (2 - ---)  (2 0, ..., p, where 1 is the number of the pulse generator, n is an even number of pulse generators, the output of the RS flip-flop is connected to the second input of the first element, And its S input is to the output of the second element And, R-input - to the output of the third element And, the inputs of which are connected to the output of the element NOT and the pulse generator with the number n, to the inputs of the second element And the first output of the command key and the pulse generator with the first number are connected, the input of the element is NOT connected to the first output command key. 2. The device according to claim 1, about tl and - the fact that, for the purpose of performance, it is equipped with a resistor connected in parallel with the capacitor. Compiled by Luzanov - Editor A. Lezhnin Tehred G. Gerber | Proofreader 0. Lugov 4137/55 Circulation 631 Subscription VNIIPI USSR State Committee Inventions and discoveries 113035, Moscow, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 fPLfS.2