Method for preventing 10kV overhead insulated line from being broken by lightning stroke

Abstract

The invention relates to a method for preventing a 10kV overhead insulated line from being broken by lightning stroke, which comprises a tower, an isolation lightning arrester and a shielding isolation downlead, three cross arms are uniformly arranged in front of the tower from top to bottom, U-shaped hoops are arranged at the connecting parts of the cross arms and the tower, line column type porcelain insulators are arranged on the left and right sides above the cross arms, and the line column type porcelain insulators are connected with the isolation lightning arrester and the shielding isolation downlead. A chuck is arranged on the right side below the tower; a chassis is arranged at the bottom of the tower; an isolation lightning arrester is arranged above the rear part of the overhead line; an insulation supporting rod is arranged below the isolation lightning arrester, a mast is arranged on the right side of the insulation supporting rod, and a shielding isolation downlead is arranged below the insulation supporting rod; an intelligent lightning counter is arranged below the shielding isolation downlead, and a grounding system is arranged below the intelligent lightning counter; the lightning protection device has the advantages of non-contact active interception mode, direct and effective lightning protection effect, simplicity and convenience in installation and long service life.

Description

technical field [0001] The invention belongs to the technical field of protection against lightning strike and disconnection of overhead lines, and in particular relates to a method for preventing lightning strike and disconnection of 10kV overhead insulated lines. Background technique [0002] The 10kV distribution line is the most important transmission line for power users. Its safe and stable operation is related to the safety of the user's electricity consumption, and it is also related to the normal operation of the equipment on the distribution network. It is necessary to study how to improve the lightning protection level of the distribution line and avoid the line Due to excessive lightning strikes that cause tripping or failure, it is of great engineering significance to ensure the safety of power distribution equipment. The current preventive measures mainly include "draining" and "blocking". Partially bare the wires, so that the arc root of the power frequency ar...

AI Technical Summary

Problems solved by technology

[0002] The 10kV distribution line is the most important transmission line for power users. Its safe and stable operation is related to the safety of the user's electricity consumption, and it is also related to the normal operation of the equipment on the distribution network. It is necessary to study how to improve the lightning protection level of the distribution line and avoid the line Due to excessive lightning strikes that cause tripping or failure, it is of great engineering significance to ensure the safety of power distribution equipment. The current preventive measures mainly include "draining" and "blocking". Partially bare the wires, so that the arc root of the power frequency arc is transferred or fixed on the special metal fittings for burning, so as to protect the wires from being burned. For example, Finland uses flashover protection clamps to strip the insulating layer at the junction of insulators and wires; Sweden and the United States Strip off a section of insulation from the insulated wires on both sides of the insulator and install an anti-arc clamp; Japan strips off the insulation of the wires at the source of the insulator, and uses a clamp insulator; the above-mentioned method of "drainage" is used to prevent the overhead insulated wire from being broken by lightning Accidents, this method is easy to operate and requires less investment, but it is partially exposed and has sealing and insulation defects. In addition, the line clamp device often has the problem of poor seismic performance. When the line is blown by the wind, it often fails. "It is to prevent power frequency continuous current arcing after lightning flashover. For example, Japan adopts a large number of overvoltage protectors, that is, metal oxide arresters with series ring outer gaps; therefore, it provides a non-contact active interception method and lightning protection effect. It is very necessary to have a direct and effective, easy to install and long service life method for preventing lightning strike and disconnection of 10kV overhead insulated lines

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