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From the viewpoint of the environmental issues, SF6 gas circuit breakers are expected to adopt an environmentally benign gas as the arc quenching gas. At the present stage, the CO2 is expected to be promising quenching gas, especially for high-voltage circuit breakers. However the arc interrupting process in CO2 is not yet fully found out. For an ac high-voltage circuit breaker, arc parameters—an arc time constant and an arc power loss—around a current-zero are known to be an important factors for the interrupting process of an ac arc. Thus the present study was undertaken to measure the arc parameters of the CO2 arc before a current-zero during currentinterruption process in a CO2-blast quenching chamber. This study was also aimed at finding out the arc parameters for different CO2 pressures in the range of 0.1 and 0.2 MPa. Finally, theoretical calculation is performed so that dependences of the arc parameters on the pressure is interpreted on the basis of physical aspects of the interrupting arc. The arc paramters were determined from an arc conductance measured before a current zero, on the basis of the expression proposed by Mayr. Figure 1 shows the arc power loss during the time period from −20 to −2 μs for the pressure of 0.1 and 0.2 MPa, while Fig. 2 presents the arc time constant. The CO2 arc at the pressure of 0.1 MPa proved from Fig. 1 to show a decrease in the arc power

Arc Parameters around Current Zero in CO2-Blast Quenching Chamber and their Dependences on Filled Pressure