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Papers by Elisete Pereira

Research paper thumbnail of Single and double ended travelling-wave fault location on a MV system

Eighth IEE International Conference on Developments in Power System Protection

Page 1. ' 200 SINGLE AND DOUBLE ENDED TRAVELLING-WAVE FAULT LOCATION ON A MV SYSTEM DWP Thom... more Page 1. ' 200 SINGLE AND DOUBLE ENDED TRAVELLING-WAVE FAULT LOCATION ON A MV SYSTEM DWP Thomas and C Christopoulos The University of Nottingham UK ABSTRACT Single and double ended fault location ...

Research paper thumbnail of Fault location in distribution systems based on traveling waves

2003 IEEE Bologna Power Tech Conference Proceedings,

Page 1. Paper accepted for presentation at 2003 IEEE Bologna PowerTech Conference, June 23-26, Bo... more Page 1. Paper accepted for presentation at 2003 IEEE Bologna PowerTech Conference, June 23-26, Bologna, Italy ..... Transient Fault Location in Distribution Systems Based on Traveling Waves David W. P. Thomas ...

Research paper thumbnail of Computation of electromagnetic switching transients in a substation

Research paper thumbnail of Low Cost High Power Factor Electronic Ballast with No Input Filter

International Journal of Mechanical Sciences, 2005

A new topology of electronic ballast for fluorescent lamps employing the charge pump concept but ... more A new topology of electronic ballast for fluorescent lamps employing the charge pump concept but with no LC input filter is presented in this paper. The use of magnetic coupled boost inductors together with the connection of the resonant capacitor directly at the input stage assures high power factor even with no filtering stage for the input current. Thereby, the

Research paper thumbnail of The simulation of circuit breaker switching using a composite Cassie-modified Mayr model

IEEE Transactions on Power Delivery, 1995

... Thus, for the solution of the Cassie and Mayr equations of the ... A simulation time step of ... more ... Thus, for the solution of the Cassie and Mayr equations of the ... A simulation time step of los seconds was therefore chosen which meant that, for the circuit given in figure 3, any simulation errors would be due to the error in representing the circuit breaker arc's non-linear ...

Research paper thumbnail of Initial Experiences with a New FPGA Based Traveling Wave Fault Recorder Installed on a MV Distribution Network

2008 Joint International Conference on Power System Technology and IEEE Power India Conference, 2008

This paper presents the initial results obtained from a newly developed FPGA based traveling wave... more This paper presents the initial results obtained from a newly developed FPGA based traveling wave fault recorder installed on a medium voltage (MV) distribution line. The recorder is capable of recording six input signals, simultaneously sampling at 40 mega samples per second (MSPS) and at 14 bit resolution. It uses high bandwidth 17 MHz Rogowski coils connected to the secondary

Research paper thumbnail of Field trial of fault location on a distribution system using high frequency transients

2005 IEEE Russia Power Tech, 2005

ABSTRACT

Research paper thumbnail of Calculation of radiated electromagnetic fields from cables using time-domain simulation

IEEE Transactions on Electromagnetic Compatibility, 1994

Abstruct-Radiated electromagnetic fields are produced by currents in cables or transmission lines... more Abstruct-Radiated electromagnetic fields are produced by currents in cables or transmission lines interconnecting various circuits. An elegant method of computing the resultant electromagnetic field, produced by several radiating current elements, is given. The current in each radiating cable is first found from a time-domain simulation algorithm and this may be a steadystate or transient current. The radiated field is then calculated by assuming a radiating transmission line can be treated as a chain of short radiating dipoles. The problems associated with the calculation of the near-zone term at low frequencies and the overall response near the radiator are clarified. The proposed technique is fully evaluated and compared with other methods.

Research paper thumbnail of Single and double ended travelling-wave fault location on a MV system

Eighth IEE International Conference on Developments in Power System Protection

Page 1. ' 200 SINGLE AND DOUBLE ENDED TRAVELLING-WAVE FAULT LOCATION ON A MV SYSTEM DWP Thom... more Page 1. ' 200 SINGLE AND DOUBLE ENDED TRAVELLING-WAVE FAULT LOCATION ON A MV SYSTEM DWP Thomas and C Christopoulos The University of Nottingham UK ABSTRACT Single and double ended fault location ...

Research paper thumbnail of Fault location in distribution systems based on traveling waves

2003 IEEE Bologna Power Tech Conference Proceedings,

Page 1. Paper accepted for presentation at 2003 IEEE Bologna PowerTech Conference, June 23-26, Bo... more Page 1. Paper accepted for presentation at 2003 IEEE Bologna PowerTech Conference, June 23-26, Bologna, Italy ..... Transient Fault Location in Distribution Systems Based on Traveling Waves David W. P. Thomas ...

Research paper thumbnail of Computation of electromagnetic switching transients in a substation

Research paper thumbnail of Low Cost High Power Factor Electronic Ballast with No Input Filter

International Journal of Mechanical Sciences, 2005

A new topology of electronic ballast for fluorescent lamps employing the charge pump concept but ... more A new topology of electronic ballast for fluorescent lamps employing the charge pump concept but with no LC input filter is presented in this paper. The use of magnetic coupled boost inductors together with the connection of the resonant capacitor directly at the input stage assures high power factor even with no filtering stage for the input current. Thereby, the

Research paper thumbnail of The simulation of circuit breaker switching using a composite Cassie-modified Mayr model

IEEE Transactions on Power Delivery, 1995

... Thus, for the solution of the Cassie and Mayr equations of the ... A simulation time step of ... more ... Thus, for the solution of the Cassie and Mayr equations of the ... A simulation time step of los seconds was therefore chosen which meant that, for the circuit given in figure 3, any simulation errors would be due to the error in representing the circuit breaker arc's non-linear ...

Research paper thumbnail of Initial Experiences with a New FPGA Based Traveling Wave Fault Recorder Installed on a MV Distribution Network

2008 Joint International Conference on Power System Technology and IEEE Power India Conference, 2008

This paper presents the initial results obtained from a newly developed FPGA based traveling wave... more This paper presents the initial results obtained from a newly developed FPGA based traveling wave fault recorder installed on a medium voltage (MV) distribution line. The recorder is capable of recording six input signals, simultaneously sampling at 40 mega samples per second (MSPS) and at 14 bit resolution. It uses high bandwidth 17 MHz Rogowski coils connected to the secondary

Research paper thumbnail of Field trial of fault location on a distribution system using high frequency transients

2005 IEEE Russia Power Tech, 2005

ABSTRACT

Research paper thumbnail of Calculation of radiated electromagnetic fields from cables using time-domain simulation

IEEE Transactions on Electromagnetic Compatibility, 1994

Abstruct-Radiated electromagnetic fields are produced by currents in cables or transmission lines... more Abstruct-Radiated electromagnetic fields are produced by currents in cables or transmission lines interconnecting various circuits. An elegant method of computing the resultant electromagnetic field, produced by several radiating current elements, is given. The current in each radiating cable is first found from a time-domain simulation algorithm and this may be a steadystate or transient current. The radiated field is then calculated by assuming a radiating transmission line can be treated as a chain of short radiating dipoles. The problems associated with the calculation of the near-zone term at low frequencies and the overall response near the radiator are clarified. The proposed technique is fully evaluated and compared with other methods.