Abstract
An arc extinguishing lightning protection device with a multi-arc extinguishing chamber structure has been gradually applied to the overhead line lightning protection, but the process and key factors of the arc building of the internal multi-phase flow suppression arc still need to be studied. In this paper, based on the theory of arc magnetohydrodynamics and Euler’s high velocity flow field model, a simplified model of arc coupled polyphase longitudinal air flow in a multi-pipe structure is established, the approximate solution of the model is made, and the development process of polyphase air flow and the extinction mechanism of the arc are obtained. At the same time, the arc quenching process of polyphase longitudinal air flow is also studied experimentally. The experimental results show that the continuous arc of power frequency can be stopped quickly and will not be reignited under the condition of polyphase air flow.
Highlights
A multi-arc extinguishing chamber structure can improve the uniformity of the electric field distribution of the gap, ensure the breakdown stability of the gap, and turn the long arc into many series short arc, which is conducive to the arc extinguishing, and its application in the field of circuit breakers and switches has been relatively mature, so some researchers began to apply it in the lightning protection field of transmission and distribution network
In order to solve the problem of power frequency arc building caused by lightning,1–4 the line lightning protection device based on the structure of the multiple arc extinguishing chamber is generally installed in parallel on the insulator bypass or spiral installed on the outside side of the insulator
Compared with the traditional multi-chamber arc extinguishing structure, the arc extinguishing structure in this paper lengthens the distance between each arc initiating electrode, weakens the near-cathode effect of zero crossing arc extinguishing, strengthens the effect of heating air extinguishing in the impact stage, and makes the arc extinguishing time shorter
Summary
A multi-arc extinguishing chamber structure can improve the uniformity of the electric field distribution of the gap, ensure the breakdown stability of the gap, and turn the long arc into many series short arc, which is conducive to the arc extinguishing, and its application in the field of circuit breakers and switches has been relatively mature, so some researchers began to apply it in the lightning protection field of transmission and distribution network. Compared with the traditional multi-chamber arc extinguishing structure, the arc extinguishing structure in this paper lengthens the distance between each arc initiating electrode, weakens the near-cathode effect of zero crossing arc extinguishing, strengthens the effect of heating air extinguishing in the impact stage, and makes the arc extinguishing time shorter This kind of arc extinguishing mode can begin to accumulate the pressure burst air as the arc extinguishing energy in the impact stage, and after the impact stage, the pressure burst air has formed a certain strength and speed, but the arc that is still in the early stage of arc construction is relatively fragile, and it is difficult to develop into a stable power frequency arc under the action of high speed air. There are energy breakpoints at the adjacent arc-extinguishing elements, and the multi-point truncation of arc is realized
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
