This paper presents a novel and reliable DC switch and DC socket for high voltage DC power feeding system, in which the arc does not occur when the are turned on/off and inserted/removed, respectively. The novel prototype DC switch and DC socket have been made. Both are almost same circuit configuration and operation principle and then composed of two mechanical relays and a single MOSFET. It has been tested for the proposed DC switch to protect not only the arc but also thermal problem. As a result, it is confirmed that the arc thermal problem do not occur when the MOSFET and relays are turned on/off and relays are on in steady state, respectively, and that they have the excellent performance characteristics using simple semiconductor snubbers with the overvoltage clamp function.
Financed by the National Centre for Research and Development under grant No. SP/I/1/77065/10 by the strategic scientific research and experimental development program:
SYNAT - “Interdisciplinary System for Interactive Scientific and Scientific-Technical Information”.