Combined grounding network of overhead power transmission line pole tower

Abstract

The invention discloses a combined grounding network of an overhead power transmission line pole tower. The combined grounding network comprises a first grounding network, a second grounding network and a plurality of spacing pieces, wherein the first grounding network is mainly made of steel or galvanized steel material, the second grounding network is mainly made of graphite composite material, the plurality of spacing pieces are arranged between the first grounding network and the second grounding network at a certain distance, a certain distance is reserved between the first grounding network and the second grounding network, and the first grounding network and the second grounding network are independent to each other. By the combined grounding network of the overhead power transmission line pole tower, the problem that grounding resistance is sharply increased caused by damage to a breakage point occurring in the grounding network can be prevented, and the probability of an insulator arc-over accident is reduced; the shielding effect between adjacent conductors is further reduced, and the impact grounding resistance of the grounding network is reduced; and the combined grounding network is simple in structure and is convenient to construct, repair and maintain.

Description

technical field [0001] The invention relates to the field of electric transmission lines, in particular to a pole-tower combined grounding grid for overhead transmission lines. Background technique [0002] The grounding network of transmission line towers is an important basic power facility for lightning protection of power systems, and an important lightning protection device to reduce flashover accidents of transmission line tower insulators. The current transmission line tower grounding grid uses round steel and galvanized steel as the main grounding material, which faces many problems in the long-term operation process: [0003] 1. The corrosion problem of round steel and galvanized steel grounding bodies is serious. Due to the poor corrosion resistance of round steel and galvanized steel, in some acidic soils and saline-alkali soils, their service life can only last for 5 to 8 years. In the case of local corrosion fracture, the actual service life is greatly reduced....

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Problems solved by technology

[0003] 1. The corrosion problem of round steel and galvanized steel grounding bodies is serious. Due to the poor corrosion resistance of round steel and galvanized steel, in some acidic soils and saline-alkali soils, their service life can only last for 5 to 8 years. In the case of localized corrosion fracture, the actual service life is greatly reduced

[0004] 2. Round steel and galvanized steel grounding materials themselves are strong magnetic materials. Under the action of lightning impulse current, their ability to disperse to the far end is weak, so that the actual impact grounding impedance value of the grounding grid is much greater than its acceptance and later maintenance measurement When the power frequency grounding resistance value, it is easy to cause the insulator flashover accident when the lightning strikes the line

[0005] 3. Due to the high transportation and construction costs of round steel and galvanized steel grounding materials, the maintenance cost of the grounding grid due to corrosion fracture or solder joint desoldering is relatively high, which increases the operation and maintenance cost of the tower grounding grid

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