Anti-corrosion down conductor and use method of anti-corrosion down conductor

Abstract

The invention discloses an anti-corrosion down conductor and a use method of the anti-corrosion down conductor. An anti-corrosion sleeve (such as a seamless aluminum pipe) is arranged outside a down conductor by the inventor, a down conductor body is effectively isolated from the soil, the direct corrosion on the down conductor by harmful substances in the soil is avoided, the service life of the down conductor is obviously prolonged and is matched with the operation time of a grounding network, and the frequency for modifying a grounding device after the corrosion of the down conductor is reduced. The anti-corrosion down conductor has the advantages that the structure is simple, the construction is flexible, convenient and fast, the anti-corrosion sleeve only needs to be sheathed in a burying position of the existing down conductor, then, the anti-corrosion sleeve is pressed and connected for fixing the down conductor body, during the backfilling burying arrangement, the soil at the burying position of the down conductor is compacted, the work intensity of electric network line maintenance personnel is effectively reduced, and the ground network modification found is greatly saved.

Description

technical field [0001] The invention belongs to the technical field of grounding devices for high-voltage direct current transmission lines, and in particular relates to an anti-corrosion grounding downconductor and a using method thereof. Background technique [0002] The design operating life of the grounding device of the high-voltage DC line is 8 years, but it is found in the production, operation and maintenance that the grounding grid of the ultra-high voltage and ultra-high voltage DC transmission line that has been put into operation generally has a serious problem of grounding down-conductors after about 4 years of operation. Corrosion causes the impact grounding resistance of the entire grounding device to increase, which cannot meet the lightning protection requirements. Compared with high-voltage AC transmission lines, the corrosion of the tower grounding grid of DC lines is more serious and the corrosion rate is faster, especially the part of the tower grounding...

AI Technical Summary

Problems solved by technology

The grounding down-conductors used in transmission lines are basically Φ12 (12mm in diameter) galvanized round steel. After 3 to 4 years of operation, the cross-section of the grounding down-conductor's entry into the soil is obviously corroded and reduced, although the power frequency of some partially corroded grounding grids The measured value of the grounding resistance is not large, but when the lightning strike current acts, the cross-sectional area of ​​the grounding grid with local severe corrosion becomes smaller or disconnected, the ability to discharge the lightning current is restricted, and it is easy to cause the line lightning strike back failure

At the same time, due to the rapid and severe corrosion of the grounding part of the grounding down-conductor, the grounding device of the line needs to be rebuilt frequently, and the characteristics of the grounding device being buried in the ground and scattered in the field make the maintenance workload of the line heavy and the cost is high

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