Passive fault current limiting device

Title: Passive fault current limiting device

Full Record
Other Related Research

Abstract

A passive current limiting device and isolator is particularly adapted for use at high power levels for limiting excessive currents in a circuit in a fault condition such as an electrical short. The current limiting device comprises a magnetic core wound with two magnetically opposed, parallel connected coils of copper, a high temperature superconductor or other electrically conducting material, and a fault element connected in series with one of the coils. Under normal operating conditions, the magnetic flux density produced by the two coils cancel each other. Under a fault condition, the fault element is triggered to cause an imbalance in the magnetic flux density between the two coils which results in an increase in the impedance in the coils. While the fault element may be a separate current limiter, switch, fuse, bimetal strip or the like, it preferably is a superconductor current limiter conducting one-half of the current load compared to the same limiter wired to carry the total current of the circuit. The major voltage during a fault condition is in the coils wound on the common core in a preferred embodiment.

Inventors:

Evans, Daniel J. ^[1]; Cha, Yung S. ^[2]

(Wheeling, IL)
(Darien, IL)

Issue Date:: 1999-01-01

Research Org.:: Argonne National Laboratory (ANL), Argonne, IL

OSTI Identifier:: 872248

Patent Number(s):: 5892644

Assignee:: University of Chicago (Chicago, IL) ANL

DOE Contract Number:: W-31109-ENG-38

Resource Type:: Patent

Country of Publication:: United States

Language:: English

Subject:: passive; fault; current; limiting; device; isolator; particularly; adapted; power; levels; excessive; currents; circuit; condition; electrical; comprises; magnetic; core; wound; magnetically; opposed; parallel; connected; coils; copper; temperature; superconductor; electrically; conducting; material; element; series; normal; operating; conditions; flux; density; produced; cancel; triggered; imbalance; results; increase; impedance; separate; limiter; switch; fuse; bimetal; strip; preferably; one-half; load; compared; wired; carry; total; major; voltage; common; preferred; embodiment; power levels; conducting material; temperature superconductor; particularly adapted; operating conditions; power level; device comprises; magnetic flux; preferred embodiment; electrically conducting; fault current; magnetic core; current limiting; operating condition; current limiter; normal operating; metal strip; total current; limiting device; parallel connected; fault condition; flux density; current load; superconductor current; rate current; current limit; /361/

Citation Formats


                    Evans, Daniel J., and Cha, Yung S. Passive fault current limiting device.  United States: N. p., 1999. 
        Web.

Copy to clipboard


                    Evans, Daniel J., & Cha, Yung S. Passive fault current limiting device.  United States.

Copy to clipboard


                    Evans, Daniel J., and Cha, Yung S. Fri .  
        "Passive fault current limiting device".  United States.  https://www.osti.gov/servlets/purl/872248.

Copy to clipboard


                    
@article{osti_872248,

  title        = {Passive fault current limiting device},

  author       = {Evans, Daniel J. and Cha, Yung S.},

  abstractNote = {A passive current limiting device and isolator is particularly adapted for use at high power levels for limiting excessive currents in a circuit in a fault condition such as an electrical short. The current limiting device comprises a magnetic core wound with two magnetically opposed, parallel connected coils of copper, a high temperature superconductor or other electrically conducting material, and a fault element connected in series with one of the coils. Under normal operating conditions, the magnetic flux density produced by the two coils cancel each other. Under a fault condition, the fault element is triggered to cause an imbalance in the magnetic flux density between the two coils which results in an increase in the impedance in the coils. While the fault element may be a separate current limiter, switch, fuse, bimetal strip or the like, it preferably is a superconductor current limiter conducting one-half of the current load compared to the same limiter wired to carry the total current of the circuit. The major voltage during a fault condition is in the coils wound on the common core in a preferred embodiment.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {1999},

  month        = {1}

}

Copy to clipboard

Patent:

View Patent

Save / Share:

Export Metadata

Save to My Library

Similar records in DOE Patents and OSTI.GOV collections:

Passive fault current limiting device

Patent Evans, D.J. ; Cha, Y.S.

A passive current limiting device and isolator is particularly adapted for use at high power levels for limiting excessive currents in a circuit in a fault condition such as an electrical short. The current limiting device comprises a magnetic core wound with two magnetically opposed, parallel connected coils of copper, a high temperature superconductor or other electrically conducting material, and a fault element connected in series with one of the coils. Under normal operating conditions, the magnetic flux density produced by the two coils cancel each other. Under a fault condition, the fault element is triggered to cause an imbalancemore »« less
Optical limiting device and method of preparation thereof

Patent Wang, Hsing-Lin ; Xu, Su ; McBranch, Duncan W.

Optical limiting device and method of preparation thereof. The optical limiting device includes a transparent substrate and at least one homogeneous layer of an RSA material in polyvinylbutyral attached to the substrate. The device may be produced by preparing a solution of an RSA material, preferably a metallophthalocyanine complex, and a solution of polyvinylbutyral, and then mixing the two solutions together to remove air bubbles. The resulting solution is layered onto the substrate and the solvent is evaporated. The method can be used to produce a dual tandem optical limiting device.
Full Text Available
Fault current limiter and alternating current circuit breaker

Patent Boenig, Heinrich J.

A solid-state circuit breaker and current limiter for a load served by an alternating current source having a source impedance, the solid-state circuit breaker and current limiter comprising a thyristor bridge interposed between the alternating current source and the load, the thyristor bridge having four thyristor legs and four nodes, with a first node connected to the alternating current source, and a second node connected to the load. A coil is connected from a third node to a fourth node, the coil having an impedance of a value calculated to limit the current flowing therethrough to a predetermined value. Controlmore »« less
Full Text Available
Superconducting matrix fault current limiter with current-driven trigger mechanism

Patent Yuan, Xing

A modular and scalable Matrix-type Fault Current Limiter (MFCL) that functions as a "variable impedance" device in an electric power network, using components made of superconducting and non-superconducting electrically conductive materials. An inductor is connected in series with the trigger superconductor in the trigger matrix and physically surrounds the superconductor. The current surge during a fault will generate a trigger magnetic field in the series inductor to cause fast and uniform quenching of the trigger superconductor to significantly reduce burnout risk due to superconductor material non-uniformity.
Full Text Available
Superconducting matrix fault current limiter with current-driven trigger mechanism

Patent Yuan ; Xing

A modular and scalable Matrix-type Fault Current Limiter (MFCL) that functions as a "variable impedance" device in an electric power network, using components made of superconducting and non-superconducting electrically conductive materials. An inductor is connected in series with the trigger superconductor in the trigger matrix and physically surrounds the superconductor. The current surge during a fault will generate a trigger magnetic field in the series inductor to cause fast and uniform quenching of the trigger superconductor to significantly reduce burnout risk due to superconductor material non-uniformity.
Full Text Available

Similar Records