MemberIn the purpose to find an alternative gas to SF 6 , this paper describes the results of current-interruption experiment for a rotary-arc type of load-break switch filled with CO 2 , H 2 , He and SF 6 at an absolute pressure of 0.1 MPa in case of ring electrode made of stainless steel. In addition, in case of the switch filled with CO 2 , current-interruption experiments were also performed for the ring electrode made of copper. The interrupting capability was found to be higher in order of SF 6 , H 2 , CO 2 and He. Moreover, the switch proved to have the higher current-interrupting capability for the copper than for the stainless steel. The phenomenon was found to arise from change in magnetic flux in an inner space of a ring electrode, depending the electrode material. This change in the magnetic flux also proved to result from variation of a resistance of the ring electrode.
Gas load-break switches adopting SF 6 as quenching media have been used in power-distribution systems. However, SF 6 is a greenhouse gas and thus it is desirous to use an environmentally benign gas as the quenching medium. On the basis of the previous research results, the CO 2 has been found to be candidate as the alternative quenching-gas for the load-break switches.Some of the load-break switches employ arc-extinguishing method called a rotary-arc type. This type of load-break switch has a ring-electrode and an interrupting arc runs on the inner surface of the ring electrode, owing to application of magnetic flux. This type of load-break switch is considered to have various factors affecting the interrupting capability: (a) material of the ring electrode; (b) strength of magnetic flux; (c) admixture of other gas to CO 2 and (d) gas pressure.Until now, we have investigated the effect of the above item (a) on the arc behavior and on the interrupting capability. As the next stage, the first purpose of the present research is related to the item (b), being to measure how great rate an arc rotational velocity and a current-interrupting capability increases with the strength of the magnetic flux. The second aim of this research is related to the item (c), being to find out effect of CO 2 mixtures on the currentinterrupting capability.
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