Research On Jet Streamarc Extinguishing Device

As one of the main factors affecting the stability of power systems,lightning strikes are equipped with lightning protection devices and lightning protection measures are the main measures to prevent and limit the damage of lightning transmission lines.The basic idea of lightning protection for transmission lines is to suppress the insulation flashover,which is also called "blocking" lightning protection,to reduce the lightning trip rate of the line by suppressing lightning strikes.In recent years,with the emergence of the "sparing type"lightning protection method,the lightning protection point also causes the insulation flashover to be converted from the lightning strike tower or the lightning protection line to allow the lightning flashover to prevent its subsequent conversion into a stable power frequency arc.In this paper,the lightning protection parameters and design of the "drainage-type" lightning protection device-jet airflow cut-off arc-proof lightning protection device are studied.This paper introduces the working principle of the jet airflow lightning protection device,and mainly focuses on the important factors affecting the lightning protection device--the specifications of the detonation projectile and the arc extinguishing cylinder.Firstly,through the detonation of detonation products and the motion analysis of detonation products after detonation,the relationship between detonation velocity and charge diameter,the relationship between the end of the charging chassis and the charge is quantitatively analyzed,and the detonation velocity and charge radius are obtained.The detonation velocity is positively correlated with the charge radius,and the impulse received at the end is also positively correlated with the charge density.Finally,the quantitative relationship was combined with the query data to determine the diameter and length range of the detonation projectile:the length of the cylindrical detonation projectile was 15 mm,and the radius of the bottom surface was 8 mm.Secondly,the improvement measures are proposed for the structure of the jet lightning protection device,including the arc extinguishing cylinder adopting a trumpet shape and having an umbrella skirt on the outside,a recoil tube in the arc extinguishing cylinder,and a compression and arc extinguishing arrester.With the use of.Finally,based on the basic assumption of plasma,the jet-cutting and arc-extinguishing process of different diameter arc extinguishing cylinders was simulated,and the suitable diameter of the arc extinguishing cylinder was determined to be 10 cm.And through the lightning strike experiment,the actual hanging network operation to obtain the arc-.extinguishing effect of the jet air-cutting arc-extinguishing lightning protection device:the above-mentioned size of the lightning protection device can cut the arc during the relay protection action time,and the self-device is not any irreversible damage will be caused by the impulse.