SU842908A1 - Device for remote monitoring of pipeline cathode protection system - Google Patents

Description

(54) DEVICE FOR CATHODE TELECOMMUNICATION PROTECTION

PIPELINE

one

The invention relates to a technique for the remote measurement of cathodic protection parameters of pipelines and can be used in the oil and gas industry.

A device for measuring the parameters of cathodic protection of pipelines, in which analog information of cathodic protection is converted into digital and through a pipeline, is transmitted by repeated retransmission to dispatcher 1.

In such a device, due to repeated retransmission of signals transmitted through the pipeline channel, there is a loss of useful information. This is due to the fact that the transmission is conducted under conditions of intense high-level impulse noise.

The closest to the proposed technical entity is a device for telecontrol cathodic protection of pipelines, containing at the control point a information reproduction unit, a register, a switch, and a connection to the communication channel, registers, measuring unit, trigger for each controlled object

and a communication unit to the communication channel, as well as sensors of measured values, connected to analog-python converters, synchronization unit and digital-to-analog converters. In addition, a cathodic protection station and a modulator 2 are used to form the transmission pulses.

The disadvantages of this device are the complexity of the equipment, the accuracy of information transfer is low, and CKiipocib information transfer is low (5-10 minutes per parameter).

The purpose of the invention is to improve the accuracy and speed of information transfer.

The goal is achieved by the fact that the device for monitoring cathodic protection, which contains at the control point, an information playback unit, a register, a switch and a communication unit, registers on each monitored object, a measuring unit, a trigger and a communication unit, on

the control point introduced prohibition elements, the AND element, the OR elements, the pulse generator, the inverter, - the return button, the call button and triggers, the inputs of the first

which directly and through the Return button are connected to the communication unit to the communication channel, the output of the first trigger is connected to the first inputs of the elements AND and the prohibition elements, the output of the first of which is connected to the first input of the register and through the call button to the input of the generator pulse, the output of which the inverter is connected to the communication unit and directly to the second input of the second prohibition element, the output of which is connected to the first input of the first OR element, whose output is connected to the second input of the register, The outputs of which are connected to one input of the information reproduction unit with the first inputs of the other three-geers, whose outputs through the second OR element are connected to the second input of the second prohibition element, the output of which through the switch is connected to the second inputs of other triggers, the attachment unit to the communication channel is connected to To another input of the information playback unit and to the second input of the element AND, the output of which is connected to the second input of the first element OR, the element AND, the elements OR, d are entered on each controlled object sphering elements, pulse shaper, inverter, time delay element and prohibition elements, the connection unit to the communication channel is connected to the first inputs of the inhibiting elements, the outputs of the first two of which are connected respectively to the first inputs of the registers and the trigger and the second input of the first register, whose output through the time delay element is connected to the second input of the trigger, the output of which is connected to the second input of the second prohibition element, to the first input of the And element and through the first differentiating element to the ne The first input of the first element OR, whose output is connected to the second inputs of the first and third prohibition through the pulse shaper and the first input of the second OR, whose output is connected to the first input of the measuring unit, the output of the third prohibition through the inverter z, which is connected to the second inputs of the measuring unit and the element I, the output of which is through the second differentiating element and directly connected to the second inputs, respectively, of the first and the second element OR, the output of the element AND is connected to the second input of the second register, the outputs of which are connected to the first group of inputs of the measuring unit.

FIG. 1 shows the functional scheme of the control point; in fig. 2 is a schematic diagram of an information playback unit; in fig. 3 - functional

scheme of the controlled object; in fig. 4 - schematic diagram of the measuring unit.

The device contains a communication unit 1, including a choke connected to the high-voltage line 2 and a capacitor 3 connected to the choke and pipeline 4. At the monitoring point, the information playback unit 5 is connected to the connection unit via return buttons 6, to the register output 7 and

to the first inputs of the other triggers 8, and the outputs of these triggers are connected to the input of the second element OR 9.

Generator sync input 10

5 pulses through the call button 11 is connected to the output of the first prohibition element 12 and the input “Stop register 7. The input“ Start. Register 7 through the first element OR 13 is connected to the output of the AND 14 element and the output of the second prohibition element 15 ”. The inhibit inputs of the prohibition elements 12 and 15 are interconnected and connected to the output of the first trigger 16 and the first input of the I 14 element. The second input of this element is connected to the first input of the first trigger 16 and through the protection circuit 17 to the communication channel. The second inputs of the other flip-flops 8 are connected to the switch 18. The pulse generator 10 is connected to the communication channel through the inverter 19 and the protection circuit 20. The information playback unit contains measuring devices 21 connected to transistor switches 22 and 23. The bases of the keys 23 are connected to the outputs of the register 7, and the keys 22 to the communication channel. Each monitored object contains a measuring unit 24 connected to the outputs of the second register 25 and the output of the second element OR 26. The input “Start of the second register 25 is connected to the output of the element AND 27 and through the second differentiating element 28, the first element OR 29 to the driver 30 pulses which, through the third prohibition element 31, the inverter 32, the protective chain 33 is connected to the communication channel, and through the second prohibition element 34 is connected to the input "Start of the first register 35. The output of the second register 35 through

5, the time delay element 36 is connected to the first input of the trigger 37, and its second input is connected to the inputs of the Stop Registers 35 and 36 and to the output of the first prohibition element 38. The input element 38 is connected to the communication channel through the protective chain 39. The inhibiting input of the second prohibition element 34 is connected to the second input of the element AND 27 and to the input of the first differentiating element 40. The measuring unit contains transistor switches 41 to which the reference electrode 42 is connected, the station 43 cathodic protection with anode grounding 44 and measuring shunt 45. In the collector circuit of the keys 41 are connected

transistors 46, the bases of which are connected via a key 47 to the output of an element 27, and measuring shunt 45 is connected to a key 41 via an inverter 48. The measuring unit is also provided with a protective circuit 49.

The operation of the device is as follows.

When one of the buttons of the switch 18 is pressed, one of the triggers 8 is tilted and, through the second element OR 9, the first prohibition element 12, the call button 11 is commanded to start the pulse generator 10. A communication pulse through the attachment throttle is supplied with a command pulse series of positive polarity with respect to pipeline 4. At the monitored object, command pulses through the protective chain 33, the second prohibition element 34 is fed to the input of the Start of the first register 35, moving it to the position at which Trigger 37 will time out.

The signal from the trigger input 37 is supplied to the element AND 27, which prohibits the input of the second prohibition element 34, is differentiated and through the first element OR 29 the worldizer receives 30 pulses. The latter, through the third prohibition element 31, the inverter 32 sends one synchronizing pulse of negative polarity relative to the pipeline to the communication channel. The first synchronizing pulse at the control point causes the first trigger 16 to operate and sends a inhibit signal to the inhibitor elements 12 and 15. When the call button 11 is pressed, one command pulse of positive polarity is sent to the communication channel, which on the controlled object through the element 27 causes the second register 25 to move to one step and starts the pulse driver 30 with its leading edge. Thus, a second synchronizing pulse is transmitted to the communication channel, which at the monitoring point passes through the elements AND 14, OR 13 and moves to one step of the register 7.

The signal from the output of the register 7 opens the key 23, and the measuring device 24 is connected to the communication channel.

In the measurement unit, the signal from the output of the second register 25 provides opening of the key 46, and the comparison electrode 42 is connected via the key 11 to the communication channel. The key 47 locks the measuring unit when transmitting clock pulses. The connection at the monitored object to the communication channel of other measuring circuits (shunt 45, anode grounding 44), and at the control point of the measuring instruments 21 is similar. The return to the initial state of all transmitting units is ensured by pressing the return button 6 and forming a negative pulse in the communication channel.

Since the measuring circuits at the monitored object and the measuring devices at the monitoring point are connected to a physical circuit: the three phases of the line, the pipeline, significantly increase the accuracy of measurements. The measurement accuracy is not affected by the change in the ohmic resistance of the wires. The transmission of telemetric information from the pipeline route in analog form makes it possible to further increase the speed of information transmission and record the change in the cathodic protection parameters over time.

The proposed device can also be used for remote control of linear objects of gas and pipelines.

five

Claims (2)

Invention Formula A device for telecontrol cathodic protection of pipelines containing 0 control point information reproduction unit, register, switchboard and linkage unit, on each controlled object registers, measuring unit, trigger and linkage unit, characterized in that, in order to improve the accuracy and speed of the device, It has a ban item, an AND element, an OR element, a pulse generator, an inverter, a return button, a call button and triggers, 0 inputs of the first of which are directly and via the reset button connected to the communication unit to the communication channel, the output of the first trigger is connected to the first inputs of the And element and prohibition elements, the output of the first of which is connected to the first register input and through the call button to the input of the pulse generator, the output of which through the inverter is connected to the connection unit to the communication channel and directly to the second input of the second prohibition element, the output of which is connected to the first input of the first OR element, the output of which is connected to the second register input, the outputs of which are connected to one input of the information playback unit and the first inputs of other triggers, whose outputs through the second OR element are connected to the second input of the first prohibition element, the output of the switch is connected to the second inputs of other triggers, the connection unit to the communication channel is connected To the other bypass of the information reproduction unit and to the second input of the AND element, the output of which is connected to the second input of the first OR element, on each monitored object an AND element is introduced. OR elements, differentiating elements, pulse shaper, inverter, time delay element and prohibition elements, the connection unit to the communication channel is connected to the first inputs of the inhibit elements, the outputs of the first two of which are connected respectively to the first inputs of registers and the trigger and to the second input of the first register , the output of which is connected via the time delay element to the second input of the trigger, the output of which is connected to the second input of the second prohibition element, to the first input of the And element and through the first differentiating The first element to the first input of the first element OR, whose output through the pulse shaper is connected to the second inputs of the first and third prohibition elements and the first input of the second OR element, the output of which is connected to the first input of the measuring unit, the output of the third prohibition element is connected to the unit through the inverter connection to the communication channel, which is connected to the second inputs of the measuring unit and the element And, the output of which is through the second differentiating element and directly connected to the second inputs of the corresponding The first and second elements are OR, the output of the AND element is connected to the second input of the second register, the outputs of which are connected to the first group of inputs of the measuring unit. Sources of information taken into account during the examination 1. USSR author's certificate number 553b47; cl. G 08 C 19/28, 1975. 2. USSR author's certificate number 261518, cl. H 01 H 13/02, 1968 (prototype). sect