Title :
Development of a quick response persistent current switch [for SMES]
Author :
Takeo, M. ; Kuroda, K. ; Matsuo, M. ; Sato, S. ; Shikimachi, K. ; Wang, Q.
Author_Institution :
Res. Inst. for Superconductivity, Kyushu Univ., Fukuoka, Japan
fDate :
7/1/1996 12:00:00 AM
Abstract :
The paper describes the test results of a 100 A persistent current switch and the design of a 1.5 kA persistent current switch for use in SMES applications. These switches are of transformer-type, based on the principle of a current transformer. In order to increase resistance in the switch-off mode, bifiliar windings with a negligible small inductance are inserted into the secondary circuit of the transformer. Tests of 100 A persistent current switches have been performed with satisfactory results such as switch-off resistance of 50 Ω, switch-off time delay of 20 ms and operational current of 100 A. A 1.5 kA persistent current switch has been also designed to have a response time shorter than 100 ms and a switch-off resistance larger than 100 Ω
Keywords :
current transformers; power transformer testing; superconducting coils; superconducting device testing; superconducting magnet energy storage; superconducting switches; superconducting transformers; switchgear testing; transformer windings; 1.5 kA; 100 A; 20 ms; 50 ohm; SMES; bifiliar windings; current transformer; performance testing; persistent current switch; response time; secondary circuit; switch-off resistance; switch-off time delay; Circuit faults; Current transformers; Delay effects; Frequency; Persistent currents; Personal communication networks; Samarium; Superconducting magnetic energy storage; Switches; Switching circuits;
Journal_Title :
Magnetics, IEEE Transactions on
