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The output power of a magnetic resonant coupling wireless power transfer (WPT) system drastically decreases when the distance of couplings coils changes due to impedance mismatch. A maximum power point occurs at only one optimal distance. These characteristics are caused by limitation in design stage. This paper proposes a new impedance tuning method of tracking, for maximum power point, by adjusting...
Distance and frequency variation are the main causes for dramatic decrease of the output power and efficiency in wireless power transfer system. The influence of these parameters should be considered from the design stage. This paper investigates the effect of distance and proposes a method to estimate the distance with maximum output power for air-core coils. The effect of operating frequency focused...
The objectives of this paper are the investigation and comparison of the electrical power quality and efficacy of energy saving lamps. These lamps consume less real power and produce higher relative illumination compared with traditional incandescent lamps. However, the energy saving lamps produce high total harmonic distortion (THD) that have effect to power quality problem. On the other hand those...
The condition evaluation of insulating oil of power transformer is performed by oil contamination test and the dissolved gas analysis method. The first technique comprises of dielectric strength, interfacial tension, acidity, water content, color, and power factor. The limit value is assigned to each diagnostic test result in order to classify the condition of insulating oil as good, suspect, and...
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