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Fault current limiter using transformer and modular device of YBCO coated conductor
(IEEE Transactions on Applied Superconductivity, 2013-04-08) [Artigo]
In this work, we report on the evaluation of a superconducting fault current limiter (SFCL). It is consisted of a modular superconducting device combined with a short-circuited transformer with a primary copper winding ...
Analysis of the E-J Curve of HTS Tapes Under DC and AC Magnetic Fields at 77 K
(IEEE Transactions on Applied Superconductivity, 2009-06-01) [Artigo]
The evaluation of the electrical characteristics of technical HTS tapes are of the key importance in determining the design and operational features of superconducting power apparatuses as well as to understand the external ...
Test of a Modular Fault Current Limiter for 220 V Line Using YBCO Coated Conductor Tapes With Shunt Protection
(IEEE Transactions on Applied Superconductivity, 2011-06-01) [Artigo]
A modular superconducting fault current limiter (SFCL) consisting of 16 elements was constructed and tested in a 220 V line for a fault current between 1 kA to 7.4 kA. The elements are made up of second generation (2G) ...
Evaluation of Electrical Properties of Lap Joints for BSCCO and YBCO Tapes
(IEEE Transactions on Applied Superconductivity, 2009-06-01) [Artigo]
The joint process between tapes of coated conductors is a critical issue for the most of the applications of high temperature superconductors (HTS). Using different fabrication techniques joints of YBCO coated superconductors ...
Fault Current Limiter Using YBCO Coated Conductor-The Limiting Factor and Its Recovery Time
(IEEE Transactions on Applied Superconductivity, 2009-06-01) [Artigo]
A fault current limiter (FCL) based on an arrangement of parallel connected high temperature superconducting tapes constituting a limiter element was designed and tested in 220 V line for a fault current peak between 1 kA ...
Optimization procedures in the design of continuous induction hardening and tempering installations for magnetic steel bars
(IEEE Transactions on Magnetics, 1998-12-01) [Artigo]
An inverse problem concerning the industrial process of steel bars hardening and tempering is considered. The associated optimization problem is formulated in terms of membership functions and, for the sake of comparison, ...
Low-cost PWM speed controller for an electric mini-baja type vehicle
(Journal of the Brazilian Society of Mechanical Sciences and Engineering, 2007-01-01) [Artigo]
This paperwork presents a Pulse Width Modulation (PWM) speed controller for an electric mini-baja-type car. A battery-fed 1-kW three-phase induction motor provides the electric vehicle traction. The open-loop speed control ...
Level crossing rate of Nakagami-m fading signal: Field trials and validation
(Electronics Letters, 2000-02-17) [Artigo]
Field trial measurements are used to validate the level crossing rate formula derived in an exact manner recently for the Nakagami-m signal. The formula reveals an excellent fit to measurements in situations other than ...
Effective aspect-ratio and gate-capacitance in circular geometry MOS transistors
(Solid-state Electronics, 1996-10-01) [Artigo]
Settling analysis of MOS regulated current mirrors applied to micropower D/A converters
(Analog Integrated Circuits and Signal Processing, 2000-08-01) [Artigo]
This paper provides an insight to the trade-off between settling time and power consumption in regulated current mirrors as building parts in micropower current-switching D/A converters. The regulation-loop frequency ...