Generalized impulse cathodic protection system and generalized impulse constant potential rectifier thereof

Abstract

The invention provides a generalized impulse cathodic protection system and a generalized impulse constant potential rectifier thereof. The generalized impulse constant potential rectifier comprises a pipe-to-soil potential measurement unit, a controller, an adjustable direct current power supply, an impulse output control unit and an impulse polarity control unit, wherein the impulse polarity control unit converts direct current impulse voltage output by the impulse output control unit into direct current impulse voltage output which is opposite to the polarity of an interfering pipe-to-soil potential. The system comprises the generalized impulse constant potential rectifiers, wherein two output ends of every two generalized impulse constant potential rectifiers are electrically connected with the external surfaces at the two ends of inlet and outlet buried metal pipeline sections of a compressor station respectively and correspondingly; two earthing terminals of every two generalized impulse constant potential rectifiers are connected with a generalized anodic groundbed; and the buried metal pipeline sections are electrically insulated with the adjacent buried metal pipeline sections. The system can exert an external stray current interference resistance effect, and can convert the impulse polarity to adapt to eliminate external stray current interference in any polarity.

Description

technical field [0001] The invention relates to the technical field of electrochemical corrosion of buried metal pipelines, in particular to a generalized pulse cathodic protection system and a generalized pulse constant potential instrument. Background technique [0002] In 1928, Robert J. Cohen (Kuhn), known as the "father of electrochemistry" in the United States, installed the first set of sacrificial anode protection devices on a long-distance gas pipeline in New Orleans, thereby laying the foundation for the modern technology of cathodic protection. Lay the groundwork. At present, cathodic protection technology is widely used in the field of metal pipeline corrosion. It is very necessary to equip the long-distance oil and gas pipeline with cathodic protection system, which is the basic condition for prolonging the life of the pipeline and ensuring the safe operation of the pipeline. At present, the cathodic protection technology mainly includes three types of protect...

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Problems solved by technology

For the pulse potentiostat of the prior art, which only has unipolar voltage output of "can be positive but not negative", the pulse potentiostat does not have the ability to suppress such stray current interference

[0028] Therefore, the discussion of the stray current interference for the above two situations shows that the "left" and "right" of the pulse potentiostat of the prior art cannot be coordinated. "A device that cannot be "negative" cannot meet the requirements

Therefore, the prior art pulse potentiostat does not have the ability to suppress asymmetric stray current interference

[0029] (5) The prior art pulse potentiostat control has serious limitations

However, when the pipeline is too long, the ground potential of the interference pipe will increase cumulatively with the increase of the length of the pipeline, and the stray current interference signals of the entire pipeline are superimposed and "coupled", so that the original pulse potentiostat loses the external Resistance to stray current disturbances

Moreover, the existing pulse potentiostat has a unipolar output, which cannot change the pulse polarity to adaptively eliminate external DC and AC stray current interference and geomagnetic stray current interference caused by space weather

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