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Dynamic analysis of flashover in high voltage DC polluted insulator
(1992-01-01)
The actual voltage growing in electrical power systems make the insulation studies, very important. In this, one of the principal problems is the development of discharges in surface polluted high tension insulators. Under ...
Melhoria na isolação de bobinas de média e alta tensão: aplicação dos conceitos de melhoria contínua no processo de isolação das cabeças de bobinas
(Universidade Tecnológica Federal do ParanáCuritibaBrasilEspecialização em Engenharia de ProduçãoUTFPR, 2017-03-03)
The study herein presented regards the use of quality tools for the improvement in a facility focused on manufacturing electrical motors. The Coils Manufacturing Area was choosen, where form-wound, flat wires, medium voltage ...
Reliability evaluation of power transformers using partial discharge testing and measurement of low molecular mass acids in insulating oil
(2014-11-10)
The transformer is a fundamental part in electrical power systems. This equipment represents high cost and requires greater attention during maintenance activities. To avoid interruptions, it is important to evaluate the ...
Analysis of the Dielectric Behavior of Distribution Insulators Under Non-Standard Lightning Impulses Voltages
(IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2011)
Overhead distribution lines are often exposed to lightning overvoltages, whose waveforms vary widely and can differ substantially from the standard impulse voltage waveform (1,2 - 50). Different models have been proposed ...
THEORY OF ELECTRICAL CHARACTERISTICS OF A SCHOTTKY-BARRIER HAVING EXPONENTIALLY DISTRIBUTED IMPURITY STATES AND METAL-INSULATOR METAL STRUCTURES
(Iop Publishing Ltd, 1992-03-30)
The metal-insulator or metal-amorphous semiconductor blocking contact is still not well understood. Here, we discuss the steady state characteristics of a non-intimate metal-insulator Schottky barrier. We consider an ...
THEORY OF ELECTRICAL CHARACTERISTICS OF A SCHOTTKY-BARRIER HAVING EXPONENTIALLY DISTRIBUTED IMPURITY STATES AND METAL-INSULATOR METAL STRUCTURES
(Iop Publishing Ltd, 1992-03-30)
The metal-insulator or metal-amorphous semiconductor blocking contact is still not well understood. Here, we discuss the steady state characteristics of a non-intimate metal-insulator Schottky barrier. We consider an ...
Desenvolvimento de modelo hidrodinâmico do fluxo de óleo em um relé de proteção acoplado a um transformador de potência.
(Universidade Católica de Pernambuco, 2021-03-10)
The present work aims to propose a hydrodynamic study of a gas relay using the computational
fluid dynamics tool, in order to predict the speed, temperature variation and oil pressure
profiles, based on their physical ...
How a dc Electric Field Drives Mott Insulators out of Equilibrium
(American Physical Society, 2018-07)
Out of equilibrium phenomena are a major issue of modern physics. In particular, correlated materials such as Mott insulators experience fascinating long-lived exotic states under a strong electric field. Yet, the origin ...
Classification of polymers insulators hydrophobicity basead on digital image processing
(ABM, ABC, ABPol, 2012)
Although the hydrophobicity is usually an arduous parameter to be determined in the field, it has been pointed out as a good option to monitor aging of polymeric outdoor insulators. Concerning this purpose, digital image ...