SU680017A1 - Remote pipeline cathode protection monitoring device - Google Patents

Description

one

The invention relates to the field of automation and telemechanization of pipelines and other underground utilities.

A device for continuous automated quality control of cathodic protection is known, which contains an auxiliary electrode and a relay device that generates a signal when the protective potential decreases below the minimum value of l.

A disadvantage of the known device is the low accuracy of quality control of pipeline protection.

The closest in technical essence to the proposed is a device containing a control room connected to a pipeline connected to a controlled point containing a receiver, whose input and output of the modulator are connected to the input of the controlled point, to the first input of the modulator the generator output is connected to the second input - output of the cathodic protection station, the input of which is connected to the grounding circuit, and the third input is connected to the first inputs of the prohibition unit, the memory unit, the switching unit and the driver output

pulses, to the first input of which the first output of the switching unit is connected, the second output of the switching unit is connected to the first input of the gap generator, the output of which is connected to the second inputs of the inhibit block, pulse generator and the switching block, the first output of the inhibit block is connected to the second input of the gap generator, the first output of the memory unit is connected to the third inputs of the switching unit and the gap generator, the second output of the prohibition unit is connected to the second input of the memory unit, the second output of which is connected to the third input at the block ban 2.

A disadvantage of the known device is the low accuracy of the cathodic protection counter.

The aim of the invention is to improve the accuracy of the device.

The goal is achieved by the fact that, at an unusable controlled point, the probe pulse generator, the reflected pulse reception unit and the RC-KOHtur are entered, the receiver output is connected to the first input of the probe generator

0 pulses, the second input of which is connected to the grounding circuit, and the output to the first input of the receiving pulses receiving unit and to the modulator output, the second input of the reflected pulses receiving unit is connected to the grounding circuit, the first output to the fourth input of the prohibition block, and the second output is connected to the fourth input of the switching unit I to the pipeline at a controlled point, an output of the forming HC circuit is connected, the input of which is connected to the grounding circuit.

Diagram of the device shown in the drawing.

The device contains dispatching point 1, pipeline 2, receiver 3, generator of 4 probe pulses, block 5 of receiving reflected pulses switching block b, block 7 of the prohibition, pulse shaper 8, modulator 9, generator 10, cathodic protection station 11, block 12 Shaper 13,

The device works as follows.

On command from the control room 1 (DP) in the pipeline channel 2 receives the control signal, filled with the control frequency.

 At the first control point (KP) from the DP signal is fed to the input of the receiver 3; from its output, the signal is fed to the input of the generator 4, which produces probe pulses. The probing pulses through the pipeline channel are fed to the forming RC circuit 14, for example, a capacitor and inductance connected in series and installed at the point of control of the protective potential, are partially reflected from it, partially propagate further and attenuate.

The signal reflected from the two-port depends on the voltage applied to the two-port, which is equal to the protective potential of the pipeline at a given point.

Reflected pulses arrive at the code of the block 5 receiving the reflected pulses, which generates a pulse arriving at the input of the switching unit 6 and the input of the prohibition unit 7. From the output of the switching unit 6, a pulse is fed to the driver of the pulse 8, which forms a square pulse and feeds it to one of the inputs of the modulator 9. A response signal is generated, which with a constant current of the cathodic protection station 11 enters the pipeline channel. At the same time, the signal from the pulse generator 8 is fed to the blocking first input of the switching unit 6, which prevents the signal from the block 5 of receiving the reflected pulses 5 to the pulse generator 8 during its operation and to the memory block 12, which prohibits reception of the direct signal and It outputs a signal to switching unit 6 and the pause driver 13, which was disconnected from block 6 in its initial state. Now this unit prohibits 5 1 signal from the reflected-impulse reception unit 5 directly to the pulse driver 8. The signals from the output of block 5 will come through the pause maker 13 after 0 spitting the memory block 12.

Similarly, the work of the following KP.

After receiving the direct signal from the PD and transmitting its signal, the first CP will receive a return signal from the second CP with some time delay.

Return signals in the chain are returned to the DP where they are recorded. 0 When the value of the protective potential changes below the minimum, the magnitude of the pulse reflected from the forming circuit 14 changes, and the block 5 of receiving the reflected pulses 5 detects the change and does not give a signal to start subsequent blocks of the control.

The termination of the arrival of the return pulses is fixed at the DP and the CP with the zone of low potential is determined.

Introduction to the known device for telecontrol of the cathodic protection station through the pipeline channel 5 at the control point of the generator

probe pulses and a unit for receiving reflected pulses, and at the potential control point, a forming RC link allows precise control of the cathodic protection completeness, timely detection of pipeline sections with reduced protective potential, and restoration of normal operation.

Claims (2)

1. The patent of Germany No. 1521957, cl. From 23 F, 1969. 2. USSR author's certificate №310282, cl. G 08 C 19/16, 03/27/69 (prototype).