Abstract
A dual-jet arc-extinguishing method is proposed in order to improve the performance of jet-extinguishing gaps for extinguishing large currents and reducing the lightning trip-out rate of power lines. Meanwhile, we studied the arc-extinguishing effect of the dual-jet non-equilibrium field gas flow. Based on this, a Double Jet Arc Extinguishing Gap (DJAEG) is developed. First of all, the jet field arc extinction modeling analysis is carried out by coupling the typical MAYR arc model with the jet field. Then, the COMSOL MUTIPHSICS simulation software is used to simulate the arc extinction of the DJAEG in the balanced flow field and the non-balanced flow field. Finally, the DJAEG extinguishment arc test is carried out through the construction of the power frequency continuous flow interruption test. The simulation results show that the velocity of the high-speed jet emitted by the DJAEG can reach 3000 m/s, and the arc can be extinguished within 4 ms. These results also verified that the dual jet non-equilibrium flow field has the characteristics of long jet sustaining time. The test results show that the DJAEG successfully extinguished the arc within 4 ms, and there was no reignition. This means that the dual-jet non-equilibrium field has an obvious arc extinction effect.
Highlights
Power system is a vital part for social development
The MAYR arc coupled line model established in this paper is simulated in conjunction with the Double Jet Arc Extinguishing Gap (DJAEG) arc-extinguishing process
The viewpoints of the equilibrium flow field and the nonequilibrium flow field appearing in the jet process of the DJAEG are proposed, and their advantages and disadvantages are compared
Summary
Power system is a vital part for social development. Its stable operation is directly related to the safety and reliability of social production. The continuous ignition of power frequency continuous current arc will ablate the insulator, destroy the insulation level of the line, and increase the probability of tripping by lightning strikes.. In order to avoid the burning of the insulator and being struck by lightning, the transmission lines normally use a pair of metal electrodes in parallel at both ends of the insulator to form an open parallel protection gap.. Japanese scholars like Mikimasa Iwata and Toshiya Ohtaka have developed an Arcing Horn Arrester (AHA) based on the principle of gas blown arc extinction known as Fault Current Interrupting Arcing Horn (FCIAH)..This product can protect the insulator while evaporating and decomposing the gas through the inner wall to extinguish the power frequency arc.. Based on this, they developed the Multi-Chamber Insulation Arrester (MCIA).. The formation of the DJAED arc extinguishing gas depends on external gas generating materials, while MCS and MCIA only rely on the characteristics of their structure for arc extinguishing
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