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

Abstract

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.

Power Quality in DC Power Distribution Systems and Microgrids

“…This inrush current in DC distribution systems can be substantial enough to physically weld contact points together if connectors do not have sufficient tolerance, and the arc can cause other physical damage to the distribution system [69]. Even if the system is designed to withstand the resulting physical stresses, high inrush currents can cause voltage sags on the system that affect the operation of other equipment [67].…”