Compression arc extinguishing insulator connected in series

Abstract

The invention discloses a compression arc extinguishing insulator connected in series and belongs to the technical field of lightning protection of transmission and distribution overhead lines. The compression arc extinguishing insulator connected in series comprises a plurality of insulators and connecting rods. The plurality of insulators are connected in series through the connecting rods to form an insulator string. Both ends of the insulator string are provided with compression arc extinguishing devices. Each compression includes an arc-guiding electrode, a wire, and an end insulator. Thearc-guiding electrode is arranged on an external connecting piece, and is connected to the end insulator through the wire. The compression arc extinguishing insulator connected in series advances thearc extinguishing time from the traditional through flashover insulation coordination to the local flashover insulation coordination. After the local flashover, most insulation does not break down, and only generates surface discharge. At this time, an arc extinguishing object is only a stream of weak impulse arc with high vulnerability and low arc extinguishing difficulty.

Description

technical field [0001] The invention relates to the technical field of lightning protection for power transmission and distribution overhead lines, in particular to a series-connected compression arc-extinguishing insulator. Background technique [0002] When the thundercloud gathers to form the potential difference between the thundercloud and the earth, a very uneven electric field is always induced at the insulator. Research shows that the distribution of electric field intensity between different numbers of insulators is also very uneven when lightning strikes occur, which is manifested as high electric field intensity at both ends of the insulator string and low electric field intensity at the middle part. Due to the high electric field intensity of the insulators at the first and last ends, and the low electric field intensity in the middle of the insulator, lightning flashover arcs first appear at both ends of the insulator string, and then develop from both ends of t...

AI Technical Summary

Problems solved by technology

[0003] Nowadays, the lightning arresters and parallel gaps widely used in power lines mainly intervene when lightning strikes occur. Traditional lightning arresters have many disadvantages, such as: difficult maintenance, low lightning protection effect, and inability to protect against superimposed lightning strikes, etc.

There are also many disadvantages in the parallel gap, for example: (1) The installation of the parallel gap requires additional fittings, which is difficult to install; (2) The insulation coordination of the parallel gap is designed according to the highest breakdown voltage of the two insulators at the head and tail of the insulator string. At the beginning and end, the insulation mix ratio that leads to the parallel gap needs to be very low, which will reduce the insulation level of the line and lead to an increase in the lightning trip rate; Causes the metal electrode to be ablated, reducing the insulation coordination ability between the parallel gap and the insulator

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