Development of self-extinguishing SF6 interrupter in medium voltage class

This paper considers the research and development of the new type hybrid interrupter, which adopts both rotating arc and thermal expansion technology. The operating principle of this device depends on rapid arc rotation due to the magnetic field created by the fault current through a coil, which is mounted on contacts and also relies on the principle of thermal expansion created by arc energy in extinguishing chamber and finally causes pressure rise in expansion volume. To develop this type of interrupter, arc generation facility was constructed and to visualize arc movement in this chamber, highspeed camera measurement was introduced. In this research, the principles of the interrupting techniques are given and some experimental results of hybrid interrupter, which is developed by new technology, is introduced.