An automatic frequency conversion cathodic protection station control method for suppressing DC interference in subway

Abstract

The invention discloses an automatic variable-frequency cathode protection station control method for restraining subway direct current interference. The automatic variable-frequency cathode protection station control method for restraining the subway direct current interference comprises the following content that firstly, test data in the earlier stage general testing period are collected; secondly, a typical position on a pipeline is selected; thirdly, targeted testing is carried out on the typical position; fourthly, the position of a station control point is determined; and fifthly, automatic variable-frequency cathode protection power source equipment is determined. The automatic variable-frequency cathode protection station control method for restraining the subway direct current interference integrates the functions of subway direct current interference restraining and forged current cathode protection. The automatic variable-frequency cathode protection power source equipmenthas the capacity to adjust and control current, and the interference restraining effect is remarkable. The corrosion speed of the buried steel pipeline in the action range is controlled to be smallerthan 0.01 mm / year. Restraining of the subway direct current interference is realized through a cathode protection station inside a station yard / valve chest, and the automatic variable-frequency cathode protection station control method for restraining the subway direct current interference has the advantages of being small in investment, reducing occupied land and being convenient to construct compared with the method of drainage improvement along the pipeline. The maintenance and management engineering amount is small after the subway direct current interference preventing measure is taken.

Description

technical field [0001] The invention relates to an automatic frequency conversion cathodic protection station control method for suppressing direct current interference of subways. Background technique [0002] In order to alleviate the increasingly serious urban traffic pressure, subway rail transit has been developed rapidly. The urban subway generally adopts the power supply method of DC electric traction, adopts the catenary or the third rail as the positive pole, and the running rail, that is, the steel rail, doubles as the negative return line. The traction substation converts alternating current into direct current, and transmits it to the electric locomotive through the catenary, and the current returns to the substation by the rails and related wires. The rails are laid on the ballast bed and electrically isolated from the earth through the insulating cushion. However, as the operation time of the line increases, due to factors such as oil pollution, water seepage...

AI Technical Summary

Problems solved by technology

[0005] 1. The stray current interference of the subway leads to the dynamic interference characteristics of frequent positive and negative alternation, rapid fluctuations and large amplitude changes of the tube-ground potential, which makes the cathodic protection stations that can provide cathodic protection current centralized cannot operate normally

[0006] 2. Conventional potentiostat equipment is difficult to work normally under the DC interference of the subway

[0007] 3. Numerous sacrificial anodes or drainage points need to be set along the line. Construction and installation require a second entry. The scope of land acquisition is wide, the cost is high, the current and suppression ability provided are limited, and cannot be adjusted and controlled