Articles

Analytical Modelling of Resistive Load Effect on Transient Voltage and Power Output from d_33-mode Piezoelectric Vibration Energy Harvester

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This research analytically investigates the effect of resistive load on the transient performance of a -mode piezoelectric vibration energy harvester. Through normalized voltage and power analyses under varying normalized resistive loads and excitation frequencies, it is observed that the normalized voltage peaks consistently at resonance frequency, with its magnitude increasing as load resistance decreases. The normalized power, however, exhibits a maximum at an optimal load resistance that aligns with the system’s internal impedance, underscoring the significance of impedance matching for efficient energy harvesting. Transient voltage and power dynamics reveal faster energy dissipation and higher fluctuations at lower resistances, while higher resistances yield smoother but less efficient energy transfer. These findings provide crucial insights into the interplay between load resistance, transient dynamics, and power optimization, paving the way for improved design and application of piezoelectric energy harvesters in real-world systems.

Energize Transformer 400kVA at State Polytechnic of Samarinda with Simulation

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The purpose of this study is to analyze the performance and effectiveness of the Energize 400kVA Transformer model which acts as a step-up transformer in the electric power distribution system. The focus of this study is to evaluate the efficiency of the transformer in increasing the voltage from medium to higher levels and the impact of this conversion on power stability, energy losses, and thermal resistance.Testing was carried out by operating the transformer at various load levels and measuring performance parameters such as copper and iron losses, voltage regulation, and cooling capacity. The results showed that the Energize Transformer 400kVA can operate optimally as a step-up transformer with high efficiency in the load range of 70-90% of full capacity and good voltage stability when the load changes. The transformer cooling system also proved effective in maintaining the operating temperature within safe limits, thus contributing to a longer service life and shorter maintenance intervals. Based on these results, the Energize Transformer 400 kVA model is suitable for use as a step-up transformer in medium to large distribution networks, supporting optimal power quality and high operational efficiency.