Fault current limiters (FCL) with the cores saturated by superconducting coils

US8351167B2 · kind B2 · utility

Assignees

• Bar-Ilan University · IL
• RICOR Cryogenic & Vacuum Systems Limited Partnership · IL

Inventors

• Shuki Wolfus · Kiryat Ono, IL
• Alexander Friedman · Los Angeles, US
• Yosef Yeshurun · Ganei Tikva, IL
• Vladimir Rozenshtein · Givatayim, IL
• Zvi Bar-Haim · Afula, IL

Key dates

• Filing date: Sep 7, 2005
• Grant date: Jan 8, 2013
• Expiry date: Jun 26, 2028

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 current limiting device (30, 40, 50, 60) comprising for each phase of an AC supply a closed magnetic core (31) of reduced volume and mass having first and second pairs of opposing limbs (32a, 32b; 33a, 33b), and at least one AC coil (35a, 35b) enclosing opposing limbs (33a, 33b) of the magnetic core (31) and adapted for series connection with a load. A superconducting DC bias coil (34) encloses a limb) (32a, 32b) of the magnetic core (31) for saturating each of the opposing limbs (33a, 33b) in opposite directions by the bias coil (34). Under fault conditions, the AC flux in at least one limb counteracts the DC bias flux, bringing the limb out of saturation. Preferably, current is reduced in the DC bias coils thus bringing both opposing limbs of the core out of saturation.