SU1450117A1 - System for transmission and reception of control signals via electric mains - Google Patents

Abstract

The invention relates to telecommunications. The purpose of the invention is to increase the number of transmitted and received signals. A system for transmitting and receiving control signals over an electrical network comprises transmitting and receiving parts. By transmitting the symbols 1 and O in the command code in the system, the thyristor 6 (5) is opened into the positive (negative) half-wave of the grid voltage with angles of 113 (180 + 67 °) and 59 (18C ° -f12r), respectively. When a command pulse arises in the network, the receiving part allows receiving the signal pulses generated by the transmitting part into a negative (positive) half-wave of the network and further decoding the received command. The goal is achieved by ensuring the reception of signal pulses after 132 ° C. (time elapsed in angular degrees of the voltage period of 50 Hz) after receiving a positive signal pulse in the first pulse channel and after 240 in the second pulse channel. 1 il. (L

Description

I The invention relates to the field of telecommunications and can be used in the automation of electrical networks, as well as in systems of protection and automation of power systems.

The aim of the invention is to increase the number of transmitted and received signals.

The drawing shows the structure of the electrical circuit of the system when I transmit and receive control signals through the electrical network. I The system contains on the transmitting side a transformer 1, a generator of 2 rectangular pulses, a switch / 3, a resistor 4, the first 5 and second 6 I thyristors, the first and second elements I OR 7 and 8 the first, second, third and fourth shaper 9-12 control pulses, respectively, the first, second, and third elements are NOT 13–15, the first and second elements, and I, 16 and 17, the first, 18, and the second, 19 blocks of forming the turn-on signals, I, the register 20, the pulse former 21 code records, AND-NOT element 22, encoder 23, start-up unit 24 and transmission duration control unit 25, on the receiving side comprises i sformator track 26, and second elements porvsh thou NO 27 and 28, first, second requir- Tille, fourth and fifth -formirovate-: LEE 29-33 pulses respectively. rectangular pulse generator 34 first and second elements OR 35 and 36 pulse selector 37, setting trigger 38, trigger 39, first, second, third, quarter and fifth elements AND 40-44, counter 45, first 46 and second 47 pulse shapers duration, the first 48 and second 49 shapers of the reception pulse, the register 50, the decoder 51 and the execution unit 52.

The system works as follows.

If it is necessary to transmit any command using the encoder 23, the command code is written to the register 20. From the direct outputs of the encoder 23, the signal arrives at the input of the IS-NOT element 22, as a result of which a positive signal appears at its output the selection of the mode of the register 20 and the input of the generator 21. The rear edge of the pulse from the output of the generator 21, coming to the synchronization input of the register 20,

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leads to writing the code of the selected command in its cells. In this case, the input of the last cell of register 20 is always connected to the common input of the power source with a voltage level of Log., And the penultimate input is connected to the output of a power source with a voltage level of Log. 1, which ensures that the signal O is written to the last cell, and the penultimate one - signal 1, which corresponds to the starting unit in the transmitted command. In addition, a negative pulse from the setup output of the encoder 23 receives a signal at the first input of the unit 25, ensuring the installation of its counter in O.

To transmit the selected command, it is necessary to turn on the starting block 24 - by pressing the Start button. As a result, the output of the generator 2, synchronized from the network, is connected via transformer 1 to the first synchronization input of register 20 and to the second input of block 25. Thus, rectangular pulses synchronized with the network shift the previously recorded information in the register 20, which ensures the transformation of a parapel code recorded in a register cell into a serial one, in the form of a sequence of pulses with a duration in the period of the network voltage occurring on the last eighth cell of the istra 20. The first pulse from the output of register 20 extending through a second NOT member 14, to the input unit 25 and its leading edge flip-flop toggles its logic 1 in position. The signal from; the second output of block 25 is fed to the second inputs of the first and second elements And 16 and 17, giving permission for their operation at the time of transmission of the command.

In addition, these rectangular pulses are fed to the input of the counter of unit 2, ensuring the generator 2 is turned off after eight periods of mains voltage after the start of transmission.

The first 18 and second 19 forming units can be executed, by analogy with the generator 2 rectangular pulses k, which form rectangular pulses synchronized with the network. Their difference lies in the duration of the pulses and their location relative to the mains voltage. Duration

  14 pulses are chosen arbitrarily, and they are located relative to the mains voltage so that their leading edge is in the positive half of the mains voltage wave, and the trailing edge is in the negative one. For example, the first block 18 generates rectangular pulses, whose leading edge corresponds to 1, 113 °, and the rear edge 1, 180 + 67 °, where cc is the network voltage phase, which corresponds to the opening times of the first 5 and second 8 thyristors during transmission characters code combination. The second block 19 at Wj is 59 ° and 4 is 121 °, which corresponds to the moments of time when the first 5 and second 6 thyristors are opened when transmitting O characters in a code combination.

The pulses from the outputs of the first 18 and second 19 formation blocks arrive at the first inputs of the first and second elements AND 16 and 17, respectively. The second inputs of these elements are allowed to trigger them at the time the command is transmitted. To the third input of the first element I 16 comes the code of the command being transmitted, and to the third input of the second element I 17 inverted in the second element NOT 14 the code of the command being transmitted. As a result, the first element AND 16 transmits pulses from the first formation unit 18 to the intervals corresponding to the transmission of symbols 1 in the command code, and the second element 17 to the intervals that correspond to the transmission of characters O in the command code. The pulses from the output of the first element AND 16 are fed to the input of the first driver 9 and through the first element NOT 13 to the input of the second driver 10. As a result of this, the first driver 9 detects the control signal on the leading edge of the pulse coming from the first block 18 formation, and the second driver 10 on the rear. Similarly, the third driver 11 generates a control signal on the leading edge of the pulse coming from the second formation unit 19, and the fourth driver 12 - on the rear edge. Control signals from the outputs of the first 9 and third 11 drivers, the passage through the first element OR 7, go to the control output of the first

thyristor 6 and ensure its opening in the positive half-voltage of the grid with angles of 113 ° and 59, respectively, when transmitting symbols 1 and О in the command code. The control signals from the outputs of the second 10 and fourth 12 formers, the passage through the second element OR 7, arrive at the control output of the second thyristor 5 and ensure its opening into the negative half-wave voltage of the network with angles of 180 ° - (- 67 ° and 180 ° + 12Г, respectively, when transmitting symbols 1 and О in the command code. The control signals w through the resistor A and the switch 3 enter the electrical network

When a command pulse arises in the network, the selector 37 triggers. The pulses extracted from the network from the output of the selector 37 arrive at the first inputs of the fourth and fifth elements I 43 and 44. The second inputs of these elements receive square pulses of a duration equal to half the period of the network voltage through the transformer 26 formed by the generator 34. Moreover, the second input of the fourth element I 43 impulses the impulse to a positive half-voltage of the network, and to the second input of the fifth element I 44 it goes to the negative half-wave voltage network, which provides the possibility of occurrence of the output of the fourth AND gate 43 signal pulses generated in the positive half-wave of the mains voltage, and the output of the fifth AND gate 44 - in the negative. The pulses from the output of the fourth element And 43 are fed to the inputs of the first 46 and second 47 drivers, the first and second pulse channels, which provide for the creation of pulses of a certain duration. Their duration is chosen such as to allow the reception of a reception pulse by its falling edge, which coincides in time with the time of possible transmission of a command pulse to a negative half-voltage of the network. The first shaper 48 of the reception pulse of the first pulse channel provides for the creation of a reception pulse for quality signals 1, and the second shaper 49 of the reception pulse of the second pulse channel - O. The time between nepsbiM and the second pulses during signal transmission is quality 1, expressed in angular gras 4 50 Hz, 180 + 67-113 134 ° .. To ensure the reception of the second signal pulse, it is necessary to generate a reception pulse in about 134-2 132, and the duration of this pulse must be, taking into account fluctuations of the lacTOTH network and scheme, two degrees on both sides, is equal to about 4,

Similarly, when receiving a signal of quality O, the time interval of the first and second pulses of the avenues is 121 ° - 59 242 ° and the duration of the reception pulse will be approximately 4 °, and it should be formed after 2 240 points of reception of the first pulse.

Thus, after 132 after receiving a positive signal pulse in the first pulse channel and after 240 in the second, falling edge

The TOM of the pulse from the output of the corresponding shaper 46 and 47 includes the first 48 and the second 49 shapers, which produce pulses arriving at the first inputs of the first and second elements I 40 and 41, {ensuring the availability of | signal pulses generated by the transmitting device in a negative half-wave of the network voltage. The signal pulses received by the selector 37, from the output of the first element And 44, are fed to the second inputs of the first and second elements AND 40 and 41. trigger setup input 39 in state Log.1. As a result of switching the setup trigger 38, the generator 34 is connected via the third element AND 42 to the input of the meter 45. The counter 45, after eight periods of mains voltage after the command has started to transmit, provides the transfer of the trigger trigger 38 through the fourth driver 32 to the initial position. In addition, after each switch of the setup trigger 38 at the beginning and at the end of the reception of signals, the first 29 and third 31 drivers are operated. Per; One of them works at the beginning of the second reception - at the end. Impulses

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The first 29 and third 31 formers, driven through the first element OR 35, include the second driver 30, which ensures that all the cells of register 50 are set in О both before receiving commands and after receiving them.

In addition, the pulses from the outputs of the first and second elements And 40 and 41, respectively, to the inputs of installation 1 and O of the trigger 39, ensure that it switches in accordance with the command code received. The output signal of the trigger 39 is fed to the input of the register information 50. In addition, the pulses from the outputs of the first and second elements AND 40 and 41, the passage through the second element OR 36, include the fifth driver 33, which ensures the sequential recording of the code of the command received in register 50 by sending information pulses to: the first synchronization input of register 50. When the first starting pulse reaches the seventh register cell, the received command is deciphered and the signal from the output of the decoder 51 goes to the performer 52 block.

Claims (1)

Invention Formula A system for transmitting and receiving control signals over an electrical network, the transmitter on the transmitting side, the first and second blocks of forming turn-on signals, whose inputs are combined and connected via an electrical transformer to the electrical network, as well as the first and second thyristors, the anode of the first and the cathode of the second of which are connected to the common bus, and the cathode of the first and the anode of the second thyristor are connected to the first terminal of the resistor, the second output of which through the switch is connected to the electrical network, and on the receiving side the right angle generator pulses, whose input through a transformer is connected to an electrical network, a decoder, whose outputs are connected to an ex- perimental unit, the first and second pulse channels containing the first and second duration impulses sequentially connected, respectively, the first and second reception impulses and per714 elements BOTpoii 11, the third pulse of a canap consisting of a sequentially connected setting trigger, a third AND element and a counter, the output of the square pulse generator connected to the second input of the third AND element, which is different from increase in the number of transmitted and received signals, the first driver of control pulses, encoder, series-connected square pulse generator, trigger unit and transmission duration control block are introduced on the transmitter side, consecutively connected element AND-- | -NE, code writing pulse shaper, register, first AND element, first NOT element, second control pulse shaper and first OR element, second NO element in series, second AND element, third control pulse shaper and second the OR element and the third element of the NOT and the fourth pulse shaper of the control pulse, the output of which is connected to the second input of the first OR element, the output of which is connected to the control output of the first thyristor a, the control output of the second thyristor is connected to the output of the second element OR, the second input of which is connected through the first driver of control pulses to the output of the first element AND, the second input of which is combined with the second input of the second element AND and connected to the first output of the transmission duration control unit, The second output of which is connected to the second input of the starting block, the output of which is connected to the first control input of the register, the second control input of which is connected to the output of the NAND element whose inputs are connected enes to the first output of the encoder, which second outputs are connected to inputs sootvetstvuyuvschm information register, whose output is connected to the input of a second NOT element, whose output is connected to the second input of the transmission duration of a control unit, a third input coupled to a third output of the encoder 0 5 About Q d five 50 178 moreover, the rectangular pulse generator pass is combined with the input of the first turn-on signal shaping unit, the outputs of the first and second turn-on signal shaping blocks are connected to the third inputs of the first and second AND elements, respectively, the output of the second of which is connected to the input of the third element NOT, and on the receiving side trigger, consequently connected pulse selector and the fourth element AND, the first element IN series and the fifth AND element, sequentially connected second element H E, the first pulse shaper, the first OR element and the second pulse shaper, the third and fourth pulse shaper and the second OR element connected in series, the fifth pulse shaper and a register, whose outputs are connected to the decoder inputs, and a fourth pulse shaper is connected between the counter output and the first input of the setup trigger, the output of which is connected to the combined inputs of the second element NOT and the third pulse generator, the output of which is connected to the second input of the first OR element whose output is connected to the second register input, the third and quarter inputs of which are connected respectively to the outputs of the second pulse shaper and the trigger, the first and second inputs of which are combined respectively with the first and second inputs of the second OR element and connected to the outputs of the first and second, respectively elements And, the second inputs of which are combined and connected to the output of the fifth element And, the second input of which is combined with the first input of the fourth element And, the output of which is connected to the inputs of the first second and second pulse shapers of duration, the input of the first element is NOT combined with the second input of the fourth AND element and connected to the output of the square pulse generator, the input of which is combined with the input of the selector lAinynbcoB, and the output of the first AND element connected to the second input of the setting trigger. h N | -Essz -OD i N