@article{oai:nagoya.repo.nii.ac.jp:00030904, author = {Miyachi, Iwao}, issue = {2}, journal = {Memoirs of the Faculty of Engineering, Nagoya University}, month = {Mar}, note = {The physical properties and electric characteristics of the arc commonly found in switching operation of power systems are discussed in detail by introducting the fundamental constants of high temperature gases such as air and SF6. Temperature profiles inside the arc column are theoretically deduced for given current intensity and thermal arc radius with experimental confirmation. The effects of the electrode-metal vapour evaporated inside the column and the radiation energy from the arc core are also studied theoretically. The voltage gradient against current characteristics of the arc are decided by analytical method at first and by numerical calculation later more precisely from the electrical point of view. The time constant of arc conductance and the high temperature breakdown voltage are fully analysed based on the newly introduced theoretical consideration. The application of spiral arc is also proposed as a suitable device for direct current interrution. Then, some of the topics among the engineering requirements now being considered in the world-wide research and development of circuit-breakers in electric power systems are discussed from the viewpoints of restriking voltage, interrupting process and verification of capability. Finally, those requirements are surveyed with the abovementioned detailed knowledge of fundamental concepts on physical properties and electric characteristics of switching arc.}, pages = {169--199}, title = {Theoretical approach to the switching ARC phenomena in electric power systems}, volume = {30}, year = {1979} }