To prevent voltage decrease of distribution systems, the principle and fundamental characteristics of a solid-state current limiter using GTO thyristors were investigated.Basic components of the apparatus were a fast solid-state switch and a current limitingimpedance of low resistance in parallel with the switch. Experimental results of the testcurrent limiter showed the fault current was limited successfully, regardless of DC componentsize. The time from detection of fault occurrence to interruption of the fault currentby the solid-state switch was 40 micro-second. This time was very short in comparison withthat before the fault current reached a large value. Thermal rise of the solid-state switchfor conduction was solved by a self-cooling apparatus using a non-combustible cooling liquid.The results indicated that the solid-state current limiter was a valuable protecting devicefor high fault current distribution systems.
Toshiaki Ueda (Chubu Electric Power Co. Inc.)
Masao Morita (Chubu Electric Power Co. Inc.)
Hiroshi Arita (Hitachi Research Laboratory, Hitachi Ltd.)
Junzou Kida (Hitachi Research Laboratory, Hitachi Ltd.)
Kurosawa Yukio (Hitachi Research Laboratory, Hitachi Ltd.)
Tokio Yamagiwa (Kokubu Works, Hitachi Ltd.)