Unified Proposal for Characteristics Testing Methods and Figure of Merit of 8kV•3.5kA Class Light-Triggered Thyristors

Abstract

Power devices with high capability have been developed. 8kV•3.5kA class light-triggered thyristors have the highest capability among power devices. These devices are used in the Kii channel HVDC transmission system in Japan. In this paper, we report the extracted problems of conventional testing methods of 8kV•3.5kA class light triggered thyristors among manufacturers, and the proposed unified testing methods on the basis of element characteristics and operating conditions in Kii channel HVDC system. Furthermore, we propose a figure of merit for power devices for the practical use, and try to extract elements used at Kii channel HVDC system with small margins and low withstand capabilities.