Bar-ilan University

Other

Bar-ilan Research & Development Co., Ltd.

Ricor Cryogenic & Vacuum Systems Limited Partnership

Ricor Cryogenic & Vacuum Systems

Mio Smes Ltd.

Alexander Friedman

Yosef Yeshurun

Shuki Wolfus

Eliezer Perel

Yakov Nikulshin

Vladimir Rozenshtein

Zvi Bar-Haim

Moshe Sinvani

Yehoshua Wolfus

Yossef Yeshurun

Noam Shaked

A hybrid superconductive device for stabilizing an electric grid comprises (a) a magnetic core arrangement at least partially carrying an AC winding the AC winding connectable to an AC circuit for a current to be limited in the event of a fault; (b) at least one superconductive coil configured for storing electromagnetic energy; the superconductive coil magnetically coupled with the core arrangement and saturating the magnetic core arrangement during use. The hybrid superconductive device further comprises a switch unit preprogrammed for switching electric current patterns corresponding to the following modes: at least partially charging the superconductive coil; a standby mode when the superconductive coil is looped back; and at least partially discharging the superconductive coil into the circuit. Optionally, hybrid superconductive device comprises at least one passage located within said magnetic flux. The passage conducts a material flow comprising components magnetically separable by said magnetic flux.

Hybrid superconducting magnetic device

A three-phase current limiter () for an alternating current system includes an AC magnetic circuit having at least one AC coil (RST) for each phase of a 3-phase AC supply wound on a saturable ferromagnetic core and configured to subject respective AC coils for each phase to a common magnetic flux, and a DC magnetic circuit () for biasing the AC magnetic circuit into saturation at normal conditions. In use the AC coils are connected in series with a load and during alternate half cycles of the AC supply at least one of the AC coils produces a magnetic field that opposes a magnetic field of the DC magnetic circuit. The AC coils (R,S,T) for each phase are configured so that at least one of the AC coils exhibits unbalanced magnetic impedance relative to remaining ones of the AC coils for each phase.

Fault current limiter with saturated core

A current limiting device () comprising for each phase of an AC supply a closed magnetic core () of reduced volume and mass having first and second pairs of opposing limbs (), and at least one AC coil () enclosing opposing limbs () of the magnetic core () and adapted for series connection with a load. A superconducting DC bias coil () encloses a limb) () of the magnetic core () for saturating each of the opposing limbs () in opposite directions by the bias coil (). 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.

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

A method and converter topology for ensuring charge and discharge of electric current to a coil so as to allow simultaneous and independent charge and discharge thereof, particularly suitable for a superconducting coil and showing an increase in power transfer by a factor of up to two as compared with prior art converters.

Method and a converter topology for ensuring charge and discharge

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Lod, Israel

Alexander Friedman