Method for elimination of interference damage of leaked stray current in ground from DC power supply

Abstract

The invention discloses a spuious current interference danger eliminating method of DC power leakage, which comprises the following steps: setting inversed-balance circuit near the interference source; overlapping the inversed-balance circuit in the current leakage circuit to buck the spuious current; restoring the outer metal building to the natural electric potential before interfering. The inversed-balance circuit is composed of auxiliary cathodic bulk (4), auxiliary anodic bulk (5) and adjustable auxiliary DC power, wherein the auxiliary cathodic bulk (4) and auxiliary anodic bulk (5) are buried in one side of proximate interference source; the anode of auxiliary power connects the auxiliary anodic bulk and negative pole connects auxiliary cathodic bulk. The method can replace insulation buffer facility, which solves the current interference problem successfully.

Description

technical field [0001] The invention relates to a method for eliminating interference hazards caused by stray currents leaked from a DC power supply to the ground. The method can replace insulation and isolation facilities, and successfully treat mechanical equipment that relies on DC power supplies as power and impressed current cathodic protection systems. The associated DC stray current interference problem. Background technique [0002] Since the industrial revolution in human society, the application of electricity has brought great changes to human production and lifestyle. Electric locomotives and subways provide convenience for people to travel, electrolytic welding industry has become an important industrial production field, and cathodic protection technology provides an economical and effective means for extending the service life of steel facilities to ensure safety and reliability. With the widespread use of all these mechanical equipment powered by DC power, l...

AI Technical Summary

Problems solved by technology

Interference sources (such as subways) or cathodic protection bodies are required to be electrically insulated from the outside world. For cathodic protection of storage tanks, all pipelines, grounding electrodes, and various monitoring devices that are required to be electrically connected to the storage tank must be installed with insulating flanges, and the number is large. Inevitably expensive

As far as the subway is concerned, most of the subways in major cities in my country adopt the DC traction power supply method of running rail backflow, and the insulation technology of the rails to the ground is very difficult.

[0006] (2) The safety production requirements of in-service pipeline storage tanks are strict, and the insulation and isolation renovation conflicts with storage and transportation production, so the project is actually not feasible

[0007] (3) The electrical insulation effect is unreliable

The maintenance and inspection of storage tank pipelines are frequent. As long as one insulating flange is accidentally artificially lapped and short-circuited or fails, the entire protective storage tank will be electrically connected to the outside world, which will cause stray current interference from external metal structures.

[0008] (4) The insulation and isolation transformation of electrified railways and in-service storage tanks cannot achieve electrical insulation effects

If the external underground metal structure is just within the influence range of the leakage voltage field of the interference source, then the insulation and isolation facilities cannot solve the interference corrosion (metal electrolytic corrosion) problem of stray current

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