Method for improving arc extinguishing efficiency of multi-cavity structure by using magnetic field

Abstract

The invention relates to the technical field of overvoltage protection devices, in particular to a method for improving the arc extinguishing efficiency of a multi-cavity structure by using a magnetic field, which can improve the performance of the multi-cavity arc extinguishing structure. According to the method for improving the arc extinguishing efficiency of the multi-cavity structure by using the magnetic field, when the multi-cavity structure is broken down to generate the arc, movement of the arc plasma in the structure can be further accelerated, the arc ejection and extinguishing time is shortened, and the arc extinguishing efficiency is improved. A non-constant magnetic field is arranged on the basis of an original chamber structure, the magnetic induction intensity of the magnetic field is 0.15 T, and the direction of the magnetic field is perpendicular to the central axis between electrodes in an arc extinguishing chamber unit and the central axis of a chamber nozzle. Through the magnetic field, on the basis of pneumatic pressure acceleration, the electric arc plasma is subjected to Lorentz force in the direction of the nozzle, the movement of the electric arc plasma is accelerated, the electric arc spraying and extinguishing time is shortened, and therefore the arc extinguishing efficiency of the multi-cavity structure is improved.

Description

technical field [0001] The invention relates to the technical field of overvoltage protection devices, in particular to a method for improving the arc extinguishing efficiency of a multi-chamber structure by using a magnetic field. Background technique [0002] With the development of social economy, people's demand for electricity is increasing, and the requirements for technical and economic indicators of power grid operation at various voltage levels are increasing. The distribution network is an important component of the power system. It directly faces the majority of power users and is responsible for the distribution of electric energy. It transmits electric energy to thousands of households and is closely related to people's production activities and life. [0003] There are obvious deficiencies in the lightning protection measures of the existing distribution lines. For example, if the traditional parallel gap device is installed, although it has the advantages of c...

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Problems solved by technology

[0003] There are obvious deficiencies in the lightning protection measures of existing distribution lines. For example, if the traditional parallel gap device is installed, although it has the advantages of convenient installation, low price, and can protect insulators from arc burning, etc., it often increases the lightning tripping rate to a certain extent.

After the distribution line is struck by lightning, there is a high probability that it will cause a lightning trip and a power outage. Therefore, the lightning strike fault of the distribution network is extremely serious, and a more effective lightning protection measure is urgently needed

[0004] Scholars have proposed that the multi-chamber structure has good arc extinguishing performance, which can make up for the shortcomings of traditional parallel gap devices that cannot spontaneously extinguish arcs, and reduce the lightning tripping rate. installation and use

The arc quenching ability of the multi-chamber structure is due to the narrow and semi-closed pneumatic pressure driving the arc plasma movement to realize arc quenching. Enhancing the pneumatic pressure can only optimize the chamber structure, but it brings great challenges to the structural processing technology and material selection.

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