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The operation of circuit-breakers generates high frequency signals, therefore, a way to capture these signals is a radiometric system to evaluate the operation of the circuit-breaker, the greatest advantage of this method is that it\s possible the analyze the performance of the circuit-breaker without the need of any operational change to insert measuring devices. However, it was necessary to verify...
Some researches have shown that arcing produces impulsive radio-frequency radiation and through timing analysis of the received and recorded impulses, the switching times of circuit breakers can be measured and utilized in order to ensure the safe operation and reliability of these equipments. In this context, this paper presents a performance evaluation of power circuit breakers (CBs) using an antennas-based...
This paper presents an analysis of the performance of circuit breakers (CBs) using direct digital sampling and the wavelet transform applied to antenna signals obtained from the arc created during the switching process. Some researches have shown that arcing produces impulsive radio-frequency radiation. Therefore, from timing analysis of the received and recorded impulses, the switching times of circuit...
This work presents an analysis of the performance of surge suppression devices that currently are applied in power distribution network. Based on the Transmission Lines Method - TLM, numerical models for these devices have been created and their computational implementation made by using MATLAB™ codes. These models were simulated with some types of power surges and a comparison of results is made...
This work presents an analysis of the overvoltage in the distribution network caused by lightning discharges. Numerical simulations using TLM- Transmission Line Modeling and ATP- Alternative Transients Program are presented to show and to establish comparisons between two models for the grounding resistance of the transformer and customer: the traditional model with constant resistance and considering...
This work presents an analysis of the overvoltage in the secondary network caused by lightning discharges that are transferred from the primary through the transformer. Numerical simulations using TLM- Transmission Line Modeling and ATP- Alternative Transients Program are presented to show and to establish comparisons between two models for the grounding resistance of the transformer and customer:...
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