Method for calculating interrupting power frequency follow current capability of multi-cavity arc extinguishing device

Abstract

According to the method for calculating the power frequency follow current interrupting capacity of the multi-cavity arc extinguishing device, an arc model is used for representing a plurality of short arcs based on the arc chain type idea, the number of cavities is changed by changing the dissipated power value, and the arc model is built in ATP-EMTP. Modeling of the multi-cavity arc-extinguishing device is achieved by combining an insulation flashover model, the multi-cavity arc-extinguishing device is applied to a lightning stroke model of the power transmission line, a lightning stroke model of the power transmission line of the multi-cavity arc-extinguishing device is obtained, and the power frequency follow current interruption capacity of the multi-cavity arc-extinguishing device under different cavity numbers is calculated in a simulating mode. Compared with a multi-chamber arc extinguishing device, an arc model is realized by connecting arc models of single chambers in series, and due to the fact that the number of chambers of a multi-chamber structure is too large when the voltage grade of a power transmission line is high, the multi-chamber structure is difficult to realize in simulation. Therefore, the number of the cavities is changed by changing the dissipated power value, and safe and reliable operation of the power transmission line can be effectively guaranteed by selecting the proper number of the cavities in the lightning stroke transient model of the power transmission line.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a method for calculating the power-frequency freewheeling capability of a multi-chamber arc extinguishing device. Background technique [0002] Distribution lines occupy an important position in the power system, and it directly distributes electric energy to the majority of users. However, lightning accidents often occur during the operation of distribution lines, which affects the reliability of power supply of the power grid. In order to improve the operational reliability of the line, it is of great significance to study a new lightning protection method that can actively extinguish the arc. In recent years, some scholars have proposed a multi-chamber structure that can actively extinguish arcs. Multiple spherical electrodes are arranged in insulating materials, and there is an air gap between each pair of spherical electrodes, which is the arc-extinguishing chamber....

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Problems solved by technology

[0003] The multi-chamber arc extinguishing device has a simple structure and can quickly quench the arc. However, as the voltage level increases, there are several chambers in the multi-chamber structure, and the number is too large. This method of modeling is difficult to achieve in simulation. And there is no method for analyzing the ability of multi-chamber arc extinguishing devices to interrupt power frequency continuous flow under the condition of different number of chambers

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