Adjustable excess voltage protective gap fine lightning protection method of power distribution network

Abstract

The invention discloses an adjustable excess voltage protective gap fine lightning protection method of a power distribution network. The adjustable excess voltage protective gap fine lightning protection of the power distribution network mainly comprises a power distributing line insulator adjustable excess voltage protective gap fine lightning protection method, a power distributing device adjustable excess voltage protective gap fine lightning protection method and an adjustable excess voltage protective gap setting incoming line segment lightning protection method used for the power distributing line. The power distributing line insulator adjustable excess voltage protective gap fine lightning protection method is mainly used for protecting a power distributing line insulator, transferring voltaic arc channels and reducing lightning arc establishing rate of the power distributing line. Therefore, lightening trip-out rate is reduced. The power distributing device adjustable excess voltage protective gap fine lightning protection method utilizes united protection of adjustable excess voltage protective gap and a power distribution lightning arrester to a power distribution device, the problem that power distributing line and the power distributing device is conflicted in insulation coordination is solved, and the problem that the power distributing device and the lightning arrester are destroyed due to the fact that insulation level of the power distributing line is too high and exceeds bearing capacity of the power distributing lightning arrester is avoided. The adjustable excess voltage protective gap setting incoming line segment lightning protection method used for the power distributing line can conduct step-by-step intercept and release to the lightning excess voltage which is invaded along the line, the problem that lightning excess voltage which is invaded along the line can be prevented from destroying substation equipment.

Description

technical field [0001] The invention mainly relates to the field of lightning protection for distribution networks, and mainly includes lightning protection for distribution lines, lightning protection for distribution equipment and lightning protection for substations. Background technique [0002] Due to the insulation level and network structure of distribution line routing, lightning damage accidents are particularly prone to occur. Not only direct lightning strikes can cause damage, but also overvoltage generated by induced lightning can also cause lightning damage accidents. Although a lot of research has been done on lightning protection of distribution networks at home and abroad, the lightning protection measures that can be taken for distribution lines are very limited. The use of erecting lightning protection lines and coupling ground wires has little effect, and only lightning arresters are installed for protection. Due to the operation and maintenance costs of l...

AI Technical Summary

Problems solved by technology

Although a lot of research has been done on lightning protection of distribution networks at home and abroad, the lightning protection measures that can be taken for distribution lines are very limited. The use of erecting lightning protection lines and coupling ground wires has little effect, and only lightning arresters are installed for protection. Due to the operation and maintenance costs of lightning arresters High, and the lightning arrester itself will form a new fault point when it is damaged. It is only suitable for the protection of the incoming and outgoing lines of the distribution line and the distribution equipment, and cannot be installed in large quantities on the distribution network. Therefore, the lightning protection problem of the distribution network has always been It is the main problem affecting the safe operation of distribution network

[0004] The vast majority of lightning accidents in substations and distribution stations are caused by lightning overvoltage intruded by lines, because the insulation level of distribution lines is higher than that of electrical equipment in substations and distribution stations. The power lines are highly likely to be struck by lightning, and the lightning wave may also invade the substation and damage the substation equipment. In recent years, there have been many lightning accidents in which the lightning overvoltage invaded by the line has damaged the main equipment of the substation.

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