Resistive current limiter and process for producing it

US5231369A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Eberhard Preisler · Lechenich, DE
• Joachim Bock · Lechenich, DE

Key dates

• Filing date: Jun 4, 1992
• Grant date: Jul 27, 1993
• Expiry date: Jun 4, 2012

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02E40/60
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

A resistive current limiter takes the form of a hollow cylinder and is composed of high-temperature superconducting material. In this connection, the high-temperature superconducting material may be a polynary oxide. To produce said resistive current limiter, a homogeneous melt is prepared from an oxide mixture, suitable for forming high-temperature superconductors, in a specified stoichiometry and said melt is allowed to run, at temperatures above 900.degree. C., into a casting zone which rotates about its horizontal axis. The molding, solidified as a cylinder, is removed from the casting zone. The cylinder is sawn so as to produce a gap extending parallel to its axis. Furthermore, a multiplicity of slits are sawn into the cylinder parallel to the gap. Finally, the cylinder is heat-treated for up to 150 hours at 700.degree. to 900.degree. C. in an oxygen-containing atmosphere.