SU410438A1 - - Google Patents

Description

one

This invention relates to the field of telemechanics.

The devices for telecontrol of the pipeline channel of cathodic protection stations are known. They contain receivers at the control room and controlled points, the input of which is connected to the pipeline, a modulator, one of the inputs of which is connected to the cathodic protection station, and a time delay circuit. "NOT," OR-NOT, "OR," AND and triggers. At the controlled point, the devices contain a generator, the output of which is connected through the first AND circuit and the amplifier to another modulator input, and at the control room — a generator unit, one of whose outputs is connected to another modulator input, and a control unit.

However, such devices use the principle of time selection and allow only one direction to be controlled.

The aim of the invention is the implementation of address telecontrol of cathodic protection stations of two or more pipeline directions, as well as improving the reliability of determining the address of a faulty station and reducing the hardware costs for the telecontrol process.

This goal is achieved by the fact that at each controlled point the output of the first receiver through the series-connected "NOT and one of the OR-NOT connected to one of the inputs of the first trigger and the OR circuit whose output is connected to another

the input of the first scheme "I. The other input of the first trigger is connected via the first time delay element with the output of the second AND circuit, one of the inputs of which is connected to the output of the first trigger and the other input of one of the OR-NOT circuits, and the other with the output of another OR-NOT circuit the first input of which is connected to another input of the OR circuit, with one of the inputs of the second trigger and through the second time delay element - with the output of the second trigger. Another input of the latter is connected to the output of the second receiver, and to another input of another circuit “OR NOT. On the control room: one output of the control unit is connected to one of the inputs of the generator unit, and the other through a series-connected time delay element and the first circuit "NOT to the input of the second circuit" and to the other input of the generator unit connected to receiver, the output of which through the other two series-connected circuits "is NOT connected to one of the inputs of the AND circuits and the first trigger. The outputs of each trigger are connected to another input of the corresponding AND circuits, and the output of each circuit

we "And connected to one of the inputs of the corresponding trigger. Other inputs of the trigger are connected to the output of the second circuit “NOT.

This makes it possible to carry out the tele-control of the cathodic protection stations of the polling method with frequency selection. A polling signal is sent from the dispatch point (DP) at one frequency (nalimer, fi). The first controlled point from it (KP) generates and transmits a signal at the second frequency (/ 2), and the second - the signal fs. Then the order of frequency usage is repeated. Each KP forms a nerve signal from the direct signal, which is transmitted from the DP to the last CP, and then all the subsequent signals from the reverse signal, which is not transmitted from the last CP to the DP. This is achieved in that the direct signal is transmitted at one frequency, and the return signal is transmitted at another frequency, which are different from the natural transmission frequency. The feedback signals from the first gearbox are fixed at the ACL and the serviceable and faulty cathodic protection stations are detected.

The frequency combination should be as follows:

Direct reception, flmu Reverse signal reception

gf. / 3

/ af, f

/.flf,

Combinations of frequencies may be different depending on the number of fixed frequencies used.

Pa figs. 1 shows a diagram of the device for telecontrol stations of cathodic protection (equipment KP And DP); in FIG. 2 - time diagram of the process of trolling.

DP contains control unit 1, delay element 2 of type "delay, for signal drop, scam 3, 4, generator block 5 and modulator 6 to which the cathodic protection station 7 is connected and whose output is connected to the pipeline 8. In addition, the DP contains Riemvc 0, schemes “PE 10, 1.1 triggers 12, schemes“ I 13, amplifiers 14. and signal lights 15 | Ki 15.

KP except .modulator 6 and the cathodic protection station 7 contains a receiver 16 tuned to the frequency of the LR of the DP or the previous CP (counting from the DP), the circuit “PE 17, the circuit“ OR-PE 18, the circuit “OR 19,” the circuit “AND 20, generator 21, amplifier 22, trigger 23, second receiver 24 tuned to the transmission frequency of the subsequent gearbox, trigger 25, time delay element 26 of type “signal loss delay, OR – PE 27 circuit, AND 28 circuit and delay element time type 29 "delay the appearance of the signal.

The device works as follows.

Pa DP DPU unit 1 sporadically or cyclically according to the program starts the element of the time delay 2. An impulse of a certain duration T is formed, which 4

Through the circuit, the PE 3 acts on a generator unit 5 tuned to a specific frequency depending on the direction monitored by control unit 1. The signal frequency (for example / i) from the generator unit 5 is fed to one of the inputs of the modulator 6. In modulator 6 the current of the cathodic protection station 7 is modulated by the signal frequency, and in the pipeline 8 along with the current

The station receives a frequency signal (/ i) of duration Ti.

The signal propagates to the first gearbox, counting from the DP. Here, from pipeline 8, the signal goes to receiver 16, which is tuned to

DP transmission frequency (fi). From the receiver 16, a DC pulse is transmitted through the “PE 17” circuit, the “OR-PE 18” circuit and the “OR 19” circuit to one of the inputs of the “AND 20 circuit.”

of the first frequency signal, but with a different filling frequency (for example, f) using generator 21, amplifier 22, modulator 6 and cathodic protection station 7. Forming. H1 frequency signal transmission is carried out with some delay fs associated with integration input signal. The duration of the frequency signal / 2 is equal to the duration of the received frequency signal.

At the end of the pulse from the first ORI-18 circuit, the first trigger 23 is triggered and supplies a locking signal to the second input of the circuit 18, which prevents the signal 16 from the receiver 16 from passing through the OR 19 circuit to (modulator 6).

The frequency signal from the first CP (fz) propagates to the DP and to the second CP. At the second gearbox, when receiving a signal fz with a delay of the integration time, the process of generating the transmission signal at a frequency different from the DP transmission frequency and the first gearbox (for example, at a frequency / s). The signal / s from the second gearbox spreads to the third

KP and before the first KP. At the third CP, the signal is formed and transmitted at a frequency different from the frequencies of the transmitted signals from the first and second CPs (for example, at the frequency / i), etc., to the last CP.

At the nepBOiM KP, the signal fa CO of the second KP is received by the second receiver 24 tuned to the transmission frequency of the second KP (f). A DC pulse from the receiver 24 is applied to the second trigger 25, which triggers at the end of the pulse and triggers a time delay element 26. A DC pulse of duration Ti is generated. which is fed through the scheme "OR 19 to the scheme" AND 20.

The second frequency signal fz-is generated and transmitted. At the end of the pulse, the trigger 25 returns to the initial state, and a path is prepared for receiving the subsequent signal fa from the second gearbox. The fz signal also propagates to the DP and to the second gearbox. At the DP, the signal fz is received, and on the second gearbox it is shunted, because after receiving the first signal / 2, the first trigger 23 has been triggered, which eliminates a second trigger, and in one cycle polling the signal from the first gearbox. At the same time, in the second gearbox, the signal fi is received from the third gearbox; in the second path (receiver 24). The frequency signal f is re-transmitted, the Trn signal duration fs CO from the second gearbox again starts the formation of the first gearbox, and the signal is transmitted at the frequency / 2DP receives the control signals at one frequency (for example, fo) from the first gearbox. Depending on the direction | the control unit 1 adjusts the generator unit 5 and the receiver 9 through it, respectively, to the corresponding transmission frequencies; And reception. The direct current pulses come from receiver 9 through circuit "PE 10 and circuit" NOT 11 to the decoder from triggers 12 and circuits "And 13. At first, when transmitting the interrogation signal from DP, all triggers return to their original position, amplifiers 14 are de-energized, and the lamps 15 go out. Then, reception of feedback signals from the first gearbox is performed. The pulses from the receiver 9 arrive at the triggers. Moreover, the arrival of the first pulse triggers the first trigger 12, prepares the first circuit "And 13 to pass the second input pulse to the second trigger 12, and so on. When the triggers 12 are triggered, the corresponding amplifiers 14 and the lights 15 light up. -that stations of cathodic protection work. They catch fire on the control gear that received and transmitted the signal. The principle of transmitting and receiving signals is illustrated by a time diagram (Fig. 2). If there is no transmission from any control unit to the control unit prediction, counting in the polling direction from the control center, a delay element 29 of the installation path is triggered containing the “OR-NOT 27 and” AND 28 schemes after receiving the direct interrogation signal and transmitting its own signal. In doing so, the big picture is preparing for .-. new survey cycle. Consider the Dani process .dl second .dl second KP. At the end of the reception from the first QF signal f. The first trigger 28 sends a signal to one of the inputs of the second circuit, AND 28, to the second input of which the signal goes off when there is no signal from the output terminal. 24. The delay element 29 is put into operation. If during the time f there is no repeated signal from the third gearbox when the fourth gearbox fails, then the receiver 24 and the time element 26 do not give blocking signals to the OR-NO 27 circuit and the time delay element 29 is triggered. The trigger 23 returns to its original position what ensures the passage of the signal from the output of the receiver 16 through the circuit "NOT 17," OR-NOT 18 and "LII 19 to the circuit" AND 20 in the new polling cycle. At the same time, the next signal on the second gearbox is not formed, and the fourth gearbox light does not light up on the switchgear. The time t ensures the shunting of the action of the subsequent signal of the previous CP after its own signal transmission. At the last control, immediately after the termination of the reception and transmission, when the trigger 23 operates, the time element is triggered. Then, after time, taking into account the time of occurrence of the repeated signal at the input of the receiver 16 from the penultimate gearbox, the time delay element 29 is triggered and returns the trigger 23 to the initial state. The last control is again ready to receive a signal in a new poll box. The device can perform telecontrol | of cathodic protection stations in turn from three directions using three frequencies. To increase the number of controlled directions, it is necessary to increase the number of frequencies used. Subject of the Invention A device for telecontrol over a pipeline channel of cathodic protection stations, containing in the control room and monitoring points receivers, whose input is connected to the pipeline, a modulator, one of the inputs of which is connected to the cathodic protection station, and delays of time, the schemes “NOT,“ ILINE, “OR,“ AND, triggers; at each controlled point there is a generator p, the output of which is connected via the first AND circuit and the amplifier to another input of the modulator, and on the control point the generator block one of the outputs of which is connected to another input of the module torus, and a control unit, characterized in that, in order to simplify the device and increase the reliability of its operation, at each controlled point the output of the first receiver through the series connected "NOT and one of the OR OR NOT connected to one of the inputs of the first three “OR, whose output is connected to another VHO. DOM of the first circuit, another input of the first trigger, equipment, via the forward time delay element with the output of the second circuit,” AND, one of the inputs of which connects to the output of the first trigger and another input of one of the "OR NOT, and the other with the output of another circuit" OR-NOT, the first input of which is connected to another input of the circuit "OR, with one of the inputs of the second trigger and through the second time delay element - with the output of the second trigger, the other input of which is connected to the output of the second receiver and others Goma entry another circuit

"OR NOT, but, at the control room, one of the outputs of the control unit is connected to one of the inputs of the generator unit, and the other output is connected via serially connected time delay elements and the first circuit" NOT to the input of the second circuit "NOT to the other input of the generator unit connected to the reception.nikom, the output of which two

other series-connected circuits “are NOT connected to one of the inputs of the circuits“ AND and the first trigger; the outputs of each trigger are connected to another input of the corresponding AND circuits, and the output of each circuit with one of the inputs of the corresponding trigger; the other inputs of the triggers are connected to the output of the second “NOT.

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