Passive fault current limiting device
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. 6 figs.
- Inventors:
- Issue Date:
- Research Org.:
- Univ. of Chicago, IL (United States)
- Sponsoring Org.:
- USDOE, Washington, DC (United States)
- OSTI Identifier:
- 335474
- Patent Number(s):
- 5892644
- Application Number:
- PAN: 8-975,431
- Assignee:
- Univ. of Chicago, IL (United States)
- DOE Contract Number:
- W-31109-ENG-38
- Resource Type:
- Patent
- Resource Relation:
- Other Information: PBD: 6 Apr 1999
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 24 POWER TRANSMISSION AND DISTRIBUTION; CURRENT LIMITERS; ELECTRICAL FAULTS; DESIGN; HIGH-TC SUPERCONDUCTORS; SUPERCONDUCTING DEVICES; MAGNET CORES; MAGNET COILS
Citation Formats
Evans, D J, and Cha, Y S. Passive fault current limiting device. United States: N. p., 1999.
Web.
Evans, D J, & Cha, Y S. Passive fault current limiting device. United States.
Evans, D J, and Cha, Y S. Tue .
"Passive fault current limiting device". United States.
@article{osti_335474,
title = {Passive fault current limiting device},
author = {Evans, D J and Cha, Y 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. 6 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Apr 06 00:00:00 EDT 1999},
month = {Tue Apr 06 00:00:00 EDT 1999}
}