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A novel voltage step-down/up ZCS-PWM Zeta converter
(Institute of Electrical and Electronics Engineers (IEEE), 2000-01-01)
This paper presents an analysis of a novel pulse-width-modulated (PWM) voltage step-down/up Zeta converter, featuring zero-current-switching (ZCS) at the active switches. The applications in de to de and ac to de (rectifier) ...
The use of electrohydrolysis for the recovery of sulphuric acid from copper-containing solutions
(ELSEVIER, 2006-06-15)
Two lab-scale electrohydrolysis (EH) cells have been used to study the effectiveness of this method in the recovery of sulphuric acid from copper-containing electrolytes such as those present in copper electrorefining. ...
Estudo paramétrico da recuperação de petróleo pesado por aquecimento eletromagnético resistivoEstudo paramétrico da recuperação de petróleo pesado por aquecimento eletromagnético resistivo
(Universidade Federal do Rio Grande do NorteBRUFRNPrograma de Pós-Graduação em Ciência e Engenharia do PetróleoPesquisa e Desenvolvimento em Ciência e Engenharia de Petróleo, 2009-12-18)
Electrical resistive heating (ERH) is a thermal method used to improve oil recovery. It can increase oil rate and oil recovery due to temperature increase caused by electrical current
passage through oil zone. ERH has ...
Análise da tensão de restabelecimento transitória em disjuntor de alta tensão: estudo de caso em uma instalação elétrica industrial
(Universidade Federal de Santa MariaBrasilEngenharia ElétricaUFSMPrograma de Pós-Graduação em Engenharia ElétricaCentro de Tecnologia, 2021-06-29)
The electrical system is subject to several types of failure occurrences, short circuits and abnormal operating
conditions, thus producing transients in the network. For these reasons, it is essential that circuit ...
Sliding-Mode Control of a Quadratic Buck Converter with Constant Power Load
(Institute of Electrical and Electronics Engineers Inc., 2022)
This paper analyzes for the first time a two-loop sliding-mode control (SMC) of a high-order converter supplying a constant power load (CPL). The converter is a single-switch quadratic buck structure (QBC) interfacing a ...
Smart demand for improving short-term voltage control on distribution networks
(Inst Engineering Technology-ietHertfordInglaterra, 2009)
Novel high-power-factor ZCS-PWM preregulators
(Institute of Electrical and Electronics Engineers (IEEE), 2001-04-01)
This paper introduces novel zero-current-switching (ZCS) pulsewidth-modulated (PWM) preregulators based on a new soft-commutation cell, suitable for insulated gate bipolar transistor applications. The active switches in ...
Novel high-power-factor ZCS-PWM preregulators
(Institute of Electrical and Electronics Engineers (IEEE), 2001-04-01)
This paper introduces novel zero-current-switching (ZCS) pulsewidth-modulated (PWM) preregulators based on a new soft-commutation cell, suitable for insulated gate bipolar transistor applications. The active switches in ...
Método de detecção de falhas em transformadores de distribuição de poste com proteção operada
(Universidade Federal de Minas GeraisUFMG, 2006-01-01)
According to CEMIG estimates, maintenance crew perform around 100.000 switching operations in fuse equipped air switches, installed in distribution transformers, every year. Since approximately 5600 transformers are replaced ...