Koichi Kiryu

Development of plug and socket-outlet for 400 volts direct current distribution system

This paper reports test results and reviews of the developed DC plug and socket-outlet. The developed item can be applied to the 400 Vdc power to improve energy efficiency in telecommunication sites, data centers, commercial buildings, and smart energy. There are some safety issues to use the 400 Vdc power. The set of plug and socket-outlet has a unique mechanism which based on combination of a permanent magnet and mechanical contact in the limited small space. That should solve the problems such as both arc extinction and protection against electric shock known as critical DC power issue for a long time.

Characteristics of 400 V dc plug and socket-outlet for DC distribution systems

This paper reports test results and reviews for the developed plug and socket-outlet applied to the 400 V dc power systems expected to improve energy efficiency in communication sites, data centers, commercial buildings, and smart energy systems. However, there are some safety issues to use 400 V dc power. The plug and socket-outlet has a unique mechanism based on combination of a permanent magnet and mechanical contacts in the limited small space. The mechanism should solve the problems such as both arc extinguishing and protection against electric shock known as critical DC power issue for a long time. The results of an investigation of inrush current also are reported, including current size, effects and testing methods, as one problem in the construction and operation of 400 V dc power distribution circuit.

Development of appliance coupler for 400V direct current system

The prototypes of the appliance coupler for 400 Volts direct current power distribution system have developed and evaluated. Arc extinguishing and electric shock prevention functions are adopted for safety. Evaluation of load switching is performed with the prototypes and enough capability of arc extinguishing were observed. The prototype was made for confirmation of functions. So that, the shapes, sizes and specifications of the prototypes shall be reviewed along with variety of users needs and international standardization.