Title :
Quench protection of persistent current switches using diodes in cryogenic temperature
Author :
Yamamoto, Shunji ; Yamada, Tadatoshi ; Iwamoto, Masatami
Author_Institution :
Mitsubishi Electr. Corp., Hyogo, Japan
Abstract :
Transient characteristics of power diodes at cryogenic temperatures and their application to the protection of persistent current switches (PCS) in superconducting magnet systems are presented. The observed forward voltage drop was 9 V at 4.2 K and was six times larger than that at room temperature. The voltage was quickly reduced to 1 V after the diode was turned on. The transition time was less than 1 ms. A PCS with a normal state resistance of 1.5 Omega was adequately protected from quenching by the diodes.<>
Keywords :
protection; semiconductor diodes; superconducting magnets; switches; 1.5 ohm; 4.2 K; cryogenic temperature; diodes; persistent current switches; power diodes; quench protection; superconducting magnet systems; transient characteristics; Cryogenics; Diodes; Magnetic switching; Persistent currents; Personal communication networks; Power system protection; Superconducting magnets; Switches; Temperature; Voltage;
Conference_Titel :
Power Electronics Specialists Conference, 1988. PESC '88 Record., 19th Annual IEEE
Conference_Location :
Kyoto, Japan
DOI :
10.1109/PESC.1988.18150
