Effect of magnetic field strength and admixture gas on current interrupting capability of a CO₂ rotary‐arc load‐break switch

Abstract

SUMMARYFirst, current interrupting experiments were performed for a rotary-arc type of load-break switch filled with pure CO 2 at a total pressure of 0.1 MPa. Increase in the coil turns for generating magnetic field from 1 to 1.8, 2.5, and 3.6 (arbitrary unit) raised the current interrupting capability from 2.6 kA to 3.2, 3.5, and 4.1 kA. Second, experiments were performed for CO 2 gas mixture under the condition of 3.6 coil turns. Gases of He, O 2 , N 2 , and air were admixted to CO 2 . Adding either He or O 2 to CO 2 at a concentration of 30% allows the switch to have higher interrupting capability than using pure CO 2 .

Suppression of Electron Avalanches in Ultra-Dilute SF6-N2 Mixtures Subjected to Time-Invariant Crossed Fields

“…The design of the field winding that produces the crossed magnetic field will be easier in terms of the coil current and the number of turns in practice with the reduction of the magnetic field. Rotary arc load break switch and interrupter designs with increased dielectric strength due to a crossed magnetic field against transient recovery voltages are available in the literature [34][35][36].…”

Research on Arcing Characteristics of Sulfur Hexafluoride Alternative Gases in Rotating Arc Ring Main Unit

“…Yokomizu et al tested the breaking capacity of rotating arc structure in different gases. These gases included CO2, H2, He, SF6, as well as mixtures like He/CO2 and O2/CO2 [13][14]. Xiao et alstudied the breaking characteristics of the CO2 rotating arc structure, analyzing the influence of coil turns and the thickness of ring electrode rings on the breaking capability [15].…”