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

Volume

32

Issue

4

fYear

1996

fDate

7/1/1996 12:00:00 AM

Firstpage

2411

Lastpage

2414

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;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.511359

Filename

511359