Method for grounding single-core high-voltage cable metal sheath

Abstract

The invention discloses a method for grounding a single-core high-voltage cable metal sheath, which comprises the following steps: the cable metal sheath is led to the line inlet end of a grounding box by a coaxial cable; then the grounding end of the grounding box is connected with a grounding belt by a grounding wire; a parallel connection grounding line is also arranged between the grounding box and the grounding belt; one end of the parallel connection grounding line is connected with the original grounding line by a grounding wire clamp, and the other end is connected with the grounding belt by a grounding bolt; and both the grounding wire clamp and the grounding bolt are carried out seal processing by a waterproof adhesive tape. The invention effectively solves the problems of leakage current increase, grounding point heating and power failure overhauling processing on a high-voltage cable, which are caused by grounding point resistance increase because of oxidation and corrosiondue to the damp of the grounding end of the cable line metal sheath erected on a channel, and can be widely applied to the running and the overhauling maintenance of a high-voltage power transmissionline.

Description

technical field [0001] The invention relates to the field of grounding protection for high-voltage cables of transmission lines, in particular to a metal sheath grounding protection method for single-core high-voltage cables. Background technique [0002] With the rapid development of the national economy and the rapid advancement of urbanization, high-voltage and long-distance cable lines in urban construction have grown rapidly, direct burial and tunnel cable erection methods have become the main direction, and high-voltage single-core power cables have been widely used. [0003] In order to ensure the safety and transmission efficiency of the power network, high-voltage single-core power cables must be reliably grounded. The reason is that when an overvoltage or short-circuit fault occurs in the cable line, a high induced voltage will be formed on the metal sheath or the metal sheath, which will cause breakdown of the cable outer sheath insulation, so it should be used in...

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is: the connection between the grounding wire of the secondary grounding terminal of the tunnel erection cable line and the grounding belt is prone to oxidation and corrosion due to moisture, the resistance of the grounding point increases, resulting in an increase in leakage current, heating problems at the grounding point, and It is necessary to repair and deal with the power outage of the high-voltage cable, the operation and management procedures of the power outage are cumbersome, and the labor intensity of the laborers is high.

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