Researches on dielectric recovery characteristics of CO2 gas-blast arc chamber under no-load breaking

摘要

In order to replace the SF₆ gas with strong greenhouse effect in the high-voltage switchgear, CO₂ has become one of the hotspots. In this paper, LW35-40.5(G)/T2500(3150)-31.5 gas-blast circuit-breaker is used as the research object to study the dielectric recovery characteristics of CO₂ gas-blast arc chamber under no-load breaking, so that the theoretical basis for the development of CO₂ circuit-breaker can be provided. Ansoft/Maxwell software is used for simulating the distribution of the electric field distribution in the arc chamber at different clearances between contacts for purpose of obtaining the nonuniform-coefficient curves of the electric field distribution. The gas flow field characteristics of the CO₂ in the gas-blast arc chamber are simulated by Fluent software, and the pressure, density and velocity distribution of the CO₂ gas in the arc chamber were analyzed. Then, the dielectric recovery characteristics of CO₂ between open contacts during the no-load breaking process are calculated.