Double-trigger air-blast arc-extinguishing lighting protection device

Abstract

The invention discloses a double-trigger air-blast arc-extinguishing lighting protection device. The double-trigger air-blast arc-quenching lighting protection device mainly comprises a lighting protector shell, an arc starting rod, an induction coil, an arc-extinguishing barrel and an upper cover, wherein a triggering loop I and a triggering loop II are respectively arranged on two internal sidesof the lighting protector shell, and a trigger delay element is arranged on the triggering loop II. The trigger delay element is a capacitor, or an inductor or a spark gap. When the trigger delay element is the capacitor, the capacitor is parallelly connected with an arc-extinguishing air pellet II at an air pellet triggering position II and is connected in the triggering loop II; when the trigger delay element is the inductor or the spark gap, the inductor or the spark gap is serially connected with the arc-extinguishing air pellet II at the air pellet triggering position II and is connectedin the triggering loop II. Compared with a single-trigger mode, a double-trigger mode of the double-trigger air-blast arc-extinguishing lighting protection device has the advantages that the amount of the arc-extinguishing pellets is increased, arc-extinguishing energy is enlarged, asymmetry of electric arc energy and arc-extinguishing energy is realized, and effective arc extinguishing is guaranteed.

Description

technical field [0001] The invention relates to a lightning protection device for a power transmission line, in particular to a double-triggered jet airflow arc extinguishing lightning protection device. Background technique [0002] Lightning is an important factor affecting the safety of transmission lines. It has long occupied the first place in line fault tripping. It is a natural process of atmospheric activity and has not been controlled so far. However, we can analyze the frequent accidents to find the law of lightning strikes and strengthen prevention. For example, towers on high mountains or peaks, transmission lines near ponds or reservoirs, towers crossing mountains or rivers and lakes, and towers installed on high grounding resistance, rocky tower foundations and transmission lines are all vulnerable to lightning damage. focus. [0003] Lightning strikes will bring different forms of damage and damage to power facilities. Thundercloud discharge will cause light...

AI Technical Summary

Problems solved by technology

But in actual application, the applicant also finds that there are some shortcomings in it, and there will still be easy re-ignition of the arc, and the use of arc extinguishing gas pills is fast, etc. Superposition, the number of continuous pulses is more than 2-20 times (average 3-4 times), and the time interval is 15-150ms (average 30-40ms)

Although the magnitude of the subsequent lightning strike current is smaller than that of the first lightning strike current, the maximum steepness of the current rise is much larger than that of the first lightning strike current, which will cause a higher overvoltage on the inductive struck object

Therefore, when the first return strike is extinguished, the strength of the air medium has not fully recovered, and at this time the arrival of the next lightning pulse is likely to cause the arc to reignite

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