Test results of fault current limiter using YBCO tapes with shunt protection

A Fault Current Limiter (FCL) based on high temperature superconducting elements with four tapes in parallel were designed and tested in 220 V line for a fault current peak between 1 kA to 4 kA. The elements employed second generation (2G) HTS tapes of YBCO coated conductor with stainless steel reinforcement. The tapes were electrically connected in parallel with effective length of 0.4 m per element (16 elements connected in series) constituting a single-phase unit. The FCL performance was evaluated through over-current tests and its recovery characteristics under load current were analyzed using optimized value of the shunt protection. The projected limiting ratio achieved a factor higher than 4 during fault of 5 cycles without degradation. Construction details and further test results will be shown in the paper. © 2010 IOP Publishing Ltd.

The CELADE data bank. Data available and procedures to obtain tapes and tabulations

El presente documento incluye una lista de los micro-datos existentes en cintas magneticas en el Banco de Datos de CELADE a la vez que explica los procedimientos para la obtencion de los datos y tabulaciones estandarizadas disponibles en el Banco. Como parte del Programa de Informacion en Poblacion para America Latina (INFOPAL) la funcion del Banco es adquirir y hacer disponible para el procesamiento computarizado, micro-datos tales como las muestras de los censos de poblacion de 1960 y 1970 de los paises de la region, estudios comparativos de migracion interna e internacional, de fecundidad y aborto y otros estudios

Diversidade de cianobacterérias nas áreas da lagoa d Casamento e dos Butiazais de Tapes e seus ecossistemas associados (RS, Brasil)

Pós-graduação em Microbiologia - IBILCE

Electrical and Superconducting Properties in Lap Joints for YBCO Tapes

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Monofilamentary Ag/Bi:2212 tapes - Effects of silver powder addition

The Bi-Sr-Ca-Cu-O system has been one of the most studied superconducting ceramic materials for industry applications. The most of the studies with this aim are on silver/ceramic composites, due to the benefits and great compatibility of this metal with the oxide. Tapes made by the powder in tube (PIT) method have been successfully tested in pilot power plants in many countries but in Brazil. In this paper, 5, 10, and 20-wt% silver powders are introduced to compose the core of the tape along with the Bi:2212 ceramic powder. The results of electrical experiments are compared with those made with no silver addition Ag tapes. The best current density, at 60 K and no applied magnetic field, was found for the 10-wt% silver proportion, doubling the value obtained for the tape with no silver in the core.

Experimental Analysis and Numerical Simulation of Quench in Superconducting HTS Tapes and Coils

The quench characteristics of second generation (2 G) YBCO Coated Conductor (CC) tapes are of fundamental importance for the design and safe operation of superconducting cables and magnets based on this material. Their ability to transport high current densities at high temperature, up to 77 K, and at very high fields, over 20 T, together with the increasing knowledge in their manufacturing, which is reducing their cost, are pushing the use of this innovative material in numerous system applications, from high field magnets for research to motors and generators as well as for cables. The aim of this Ph. D. thesis is the experimental analysis and numerical simulations of quench in superconducting HTS tapes and coils. A measurements facility for the characterization of superconducting tapes and coils was designed, assembled and tested. The facility consist of a cryostat, a cryocooler, a vacuum system, resistive and superconducting current leads and signal feedthrough. Moreover, the data acquisition system and the software for critical current and quench measurements were developed. A 2D model was developed using the finite element code COMSOL Multiphysics R . The problem of modeling the high aspect ratio of the tape is tackled by multiplying the tape thickness by a constant factor, compensating the heat and electrical balance equations by introducing a material anisotropy. The model was then validated both with the results of a 1D quench model based on a non-linear electric circuit coupled to a thermal model of the tape, to literature measurements and to critical current and quench measurements made in the cryogenic facility. Finally the model was extended to the study of coils and windings with the definition of the tape and stack homogenized properties. The procedure allows the definition of a multi-scale hierarchical model, able to simulate the windings with different degrees of detail.

1990 Nationwide Personal Transportation Survey: user's guide to the public use tapes.

Federal Highway Administration, Washington, D.C.

Calibration of line standards of length and measuring tapes at the National Bureau of Standards.

Mode of access: Internet.

tapes-niveauet paa Jaederen undersøgt sommeren 1900.

Mode of access: Internet.

Du Spitznberg au Sahara : étapes d'un naturaliste : au Spitzberg, en Laponie en Écosse, en Suisse, en France, en Italie en Orient, en Égypte et en Algérie /

Mode of access: Internet.