Electricity is an essential energy to support society activities and to operate electric-device operation. Appearances such as employment of higher DC distribution-voltage, repetition usage of the electric device and dispersed power source placed at a far distance require us to elucidate the various properties on the basis of physical, chemical and electrical theories. Research themes are listed below.

■ High current phenomena and interruption.

・Chemical species in high temperature gas created in circuit breaker and electric fuse.

・Transient current behavior in DC motor installed in automobiles.

・High-performance of DC current interruption technology for electric fuse in automobile and for low-voltage distribution system in utility customers

・ Environmental benign quenching-gas, alternative to SF₆.

・ Elucidation of arc state around current zero.

■ Contriving next-generation equipment and measurement method.

・Monitoring method of arc interrupting state in quenching chamber.

・Application technology of semiconductor switching-function to current interruption.

・Contribution of direct current limiting technology

■ AC and DC electrical-distribution systems coordinated with dispersed Generations.

・Distribution properties of high-voltage AC distribution system having solar power generation devices.

・Property elucidation of DC delivery system installed in electric facilities.

・Electric power quality in electrical delivery systems having dispersed generations.

Our research activities are based on the energy control engineering field and are performed by use of high-current power sources, fast measurement system and various numerical calculation software.