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Error compensation of current transformers in high voltage networks
(IEEE, 2004)
An error compensation technique for measuring current transformers is described. An example is shown for current transformers installed in 150 kV switching devices. Initial ratio errors in the order of 4% and phase shifts ...
Compensação das formas de onda distorcidas pela saturação de transformadores de corrente com auxílio da estimação de frequência
(Universidade Federal de Santa MariaBREngenharia ElétricaUFSMPrograma de Pós-Graduação em Engenharia Elétrica, 2015-03-02)
This work presents innovative methods for detection and correction of the distorted portions of the secondary current waveforms, which occur due to the core saturation of current transformers (CTs). The detection technique ...
Estudo de saturação de transformadores de corrente aplicados em sistemas elétricos de potência
(Universidade Tecnológica Federal do ParanáCornelio ProcopioBrasilEngenharia ElétricaUTFPR, 2017-06-19)
This paper presents a study of current transformers (CTs) saturation applied in electric power systems through the development of a graphical interface via Matlab together with the software of transients simulation ATP. ...
Experimental analysis of harmonic distortions in the excitation currents of double-excited three-phase transformers
(Institute of Electrical and Electronics Engineers (IEEE), 2000-01-01)
This paper shows the results of experimental investigations of three-phase banks composed of single-phase transformers and three-phase three-limb core transformers under simultaneous alternating and direct current excitations, ...
Experimental analysis of harmonic distortions in the excitation currents of double-excited three-phase transformers
(Institute of Electrical and Electronics Engineers (IEEE), 2000-01-01)
This paper shows the results of experimental investigations of three-phase banks composed of single-phase transformers and three-phase three-limb core transformers under simultaneous alternating and direct current excitations, ...
Métodos para correção das distorções da forma de onda secundária causadas pela saturação de transformadores de corrente para serviço de proteção
(Universidade Federal de Santa MariaBREngenharia ElétricaUFSMPrograma de Pós-Graduação em Engenharia Elétrica, 2011-02-18)
This work aims to evaluate the performance of some methods used to detect and
correct the distorted portions of the secondary current signal waveform, which occur due to
the core saturation of current transformers. Such ...
Redes neurais aplicadas a relés diferenciais para transformadores de potência
(Sociedade Brasileira de Automática, 2008)
Este trabalho apresenta um sistema completo de proteção diferencial para transformadores de potência, através da teoria de Redes Neurais Artificiais (RNAs). O método proposto trata a classificação do sistema de proteção ...
Experimental analysis of harmonic distortions in the excitation currents of double-excited three-phase transformers
(Institute of Electrical and Electronics Engineers (IEEE), 2014)
Estudo de transformadores de corrente ópticos e seu panorama no Paraná
(Universidade Tecnológica Federal do ParanáCuritibaBrasilGraduação em Engenharia ElétricaUTFPR, 2016-06-13)
Instrument transformers (IT) are used to reduce current or voltage values of the electric power system (EPS) to values which are tolerated by the measurement, control and protection instruments, without changing its nature. ...