Graphite composite grounding body capable of reducing impact grounding resistance and preparation method for the same

Abstract

The invention discloses a graphite composite grounding body capable of reducing impact grounding resistance. The graphite composite grounding body capable of reducing the grounding resistance comprises a framework inner core, a graphite wire layer, a composite graphite wire layer and a graphite wire braiding layer; the framework inner core is a flexible fiber beam consisting of a single non-conducting flexible fiber or a plurality of non-conducting flexible fibers; the graphite wire layer coats the framework inner core and consists of the graphite wires which are longitudinally and densely arranged on the outside of the framework inner core; the composite graphite wire layer coats the graphite wire layer and consists of the composite graphite wires and the graphite wires or only consists of composite graphite wires which are tightly and longitudinally arranged on the outside of the graphite wire layer; the graphite wire braiding layer coats the composite graphite wire layer and is obtained through winding graphite wires on the composite graphite wire layer to weave; and the composite graphite wire is obtained through mixedly twisting a graphite band or a graphite wire with a metal fiber. The grounding body of the invention has a low skin effect and a low inductive effect, has small contact resistance with soil, and can effectively reduce impact grounding resistance. Besides, the grounding body is low in cost, dramatic in engineering practical application effect and can be applied to tower grounding in a power transmission line.

Description

technical field [0001] The invention belongs to the technical field of lightning protection and grounding of power systems, and in particular relates to a graphite composite grounding body capable of reducing impact grounding resistance and a preparation method thereof. Background technique [0002] With the continuous development of the power grid, the construction of transmission lines has increased accordingly. In order to ensure the safe and stable operation of the lines, the requirements for the grounding grid have also increased. Lightning strikes on power lines mostly occur in areas with frequent lightning activities and high soil resistivity, which brings huge safety hazards and economic losses to the power system. [0003] When lightning strikes the tower, a very large current will flow through the grounding grid in a very short period of time, and the potential of the electrical equipment will increase due to the existence of its resistance. It is the key to light...

AI Technical Summary

Problems solved by technology

However, when high-frequency currents such as lightning strikes or fault currents flow, due to the skin effect and inductance effect, the ability of the entire ground network to reduce the impact grounding resistance is greatly reduced, and it is difficult to effectively dissipate the current

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