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All Journal Eksergi: Jurnal Teknik Energi
Samaratungga, Langga
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Chemical Engineering, Chemistry & Bioengineering Electrical & Electronics Engineering Energy Engineering Mechanical Engineering

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Journal : Eksergi: Jurnal Teknik Energi

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Evaluation of the Efficiency and Stability of High-Frequency Inverters Under Varying Load Profiles in Photovoltaic Systems Zahro, Nabila Aida Az; Samaratungga, Langga; Hendrawati, Dwiana; Ferandez, Aggie Brenda; Efendi, Erwan Tri
Eksergi Vol. 21 No. 03 (2025): SEPTEMBER 2025
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v21i03.7111

Abstract

This research undertakes an operational performance analysis of a high-frequency inverter (HFI) within a Solar Power Plant (SPP) system configuration. The investigation prioritizes assessing the effects of pure resistive and mixed resistive-inductive load profiles on its efficiency stability. Experimental findings definitively demonstrate that the HFI inherently maintains superior efficiency stability when operating under purely resistive loads. Conversely, the introduction of varying inductive loads tends to compromise this efficiency stability, inducing significant fluctuations. These results yield crucial recommendations, establishing that HFIs are optimally suited for systems with predominantly resistive loads, thereby contributing to the overall system power efficiency enhancement
Validation Insulation Resistance Testing and Reliability Assessment of 6 kV Current Transformers for High Voltage Applications Suwarti, Suwarti; Hermawan, Natanael Yonando; Fajri, Amrisal Kamal; Samaratungga, Langga
Eksergi Vol. 21 No. 01 (2025): JANUARY 2025
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v21i01.6357

Abstract

Current transformers (CTs) are critical components in electrical power systems, particularly for measurement and protection functions in high-voltage systems. However, the performance and operational safety of CTs heavily depend on the quality of their insulation. A common issue encountered is insulation degradation due to aging, humidity, or external disturbances, which can lead to system faults or even complete equipment failure. This study aims to evaluate the insulation condition of a 6 kV CT through insulation resistance testing. The method employed involves measuring the insulation resistance using a megohmmeter with a direct current (DC) test voltage, where resistance values are recorded in megaohms (MΩ) up to gigaohms (GΩ). The test results showed an average resistance value of 145.5 GΩ, significantly exceeding the minimum threshold of 1 MΩ per kilovolt as stipulated in international standards (VDE 228/4). Therefore, it can be concluded that the CT insulation is in excellent condition and is reliably suitable for operation in high-voltage systems.
Co-Authors Dwiana Hendrawati Efendi, Erwan Tri Fajri, Amrisal Kamal Ferandez, Aggie Brenda Hermawan, Natanael Yonando Suwarti Suwarti Zahro, Nabila Aida Az