A kind of serial arc extinguishing method

Abstract

The invention discloses a serial connection type arc extinguishing method, which belongs to the technical field of lightning protection for power transmission and distribution overhead lines. The electrode passes through the wire and the terminal insulator, and several arc extinguishing channels are set on the terminal insulator. The lightning arc starts at both ends of the insulator, and the arc-guiding electrode guides the arc to the end insulator. The arc is conducted through the wires into the arc extinguishing channels in the end insulators. The arc is compressed and recoiled in the arc extinguishing channel, the energy of the arc is weakened, a part of the arc enters the next level of arc extinguishing channel, and the other part of the remaining arc is ejected from the nozzle of the arc extinguishing channel, and the local flashover arc is extinguished, avoiding the arc A penetrating channel is formed on the surface of the insulator. The arc-building channel of this method is a non-penetrating channel with huge damping; it is easier to eliminate the partial discharge arc from the source, and no penetrating flashover is formed at this time.

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 arc extinguishing method. 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, the lightning flashover arc first appears at the first and last ends of the insulator string, and then develops from both ends o...

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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