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All Journal G-Tech : Jurnal Teknologi Terapan Jurnal Ilmiah Telsinas Elektro, Sipil dan Teknik Informasi
Yusreni Warmi
Institut Teknologi Padang, Indonesia
Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering

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Analisa Pengaruh Arus Bocor Terhadap Total Harmonic Distortion Pada Isolator 150 kV Yang Terkontaminan Lumut Menggunakan Transformasi Fourier Rachmat Deska Saputra; Sitti Amalia; Yusreni Warmi; Sepannur Bandri; Andi M Nur Putra
G-Tech: Jurnal Teknologi Terapan Vol 8 No 4 (2024): G-Tech, Vol. 8 No. 4 Oktober 2024
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/gtech.v8i4.5476

Abstract

This study investigates the Total Harmonic Distortion (THD) of 150 kV insulators contaminated with moss based on leakage current patterns with three variations of test voltages, namely 10,578 V, 21,063 V, dan 30,569 V. The tests were conducted experimentally at the High Voltage Laboratory of Gajah Mada University with a temperature of 28.2 °C dan humidity of 57.8%. The test was conducted experimentally at the High Voltage Laboratory of Gajah Mada University with a temperature of 28.2°C dan humidity of 57.8%. The analyzed parameters include waveform, frequency spectrum (FFT), dan THD, which were calculated using Fast Fourier Transform (FFT) through NI DIAdem software. The test results showed no strong relationship between leakage current dan THD. At a leakage current of 0.103 mA, the resulting THD is 21.84%, while at a current of 0.207 mA produces a THD of 18.27%, dan 0.306 mA produces a THD of 36%. Based on the IEEE STD 519-2014 stdanard, THD on 150 kV insulators contaminated with moss exceeds the maximum limit of 15%, so this insulator is not safe to use on the Koto Panjang-Payakumbuh transmission line.
Contact Angle Based Dielectric Strength Enhancement of Contaminated Ceramic Insulators Using Epoxy-SiO2 Coating Martini Martini; Yusreni Warmi; Sitti Amalia
Jurnal Ilmiah Telsinas Vol 9 No 1 (2026)
Publisher : Universitas Pendidikan Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.38043/telsinas.v9i1.7047

Abstract

This study evaluates the effectiveness of epoxy-SiO2 coatings in enhancing the dielectric strength of contaminated ceramic insulators through contact angle analysis. Insulators in tropical regions, such as the 150 kV Koto Panjang-Payakumbuh line, often suffer from performance degradation due to moss contamination and high humidity, leading to reduced hydrophobicity and an increased risk of flashover. Contact angles were measured using the sessile drop method before and after coating. Uncoated insulators exhibited hydrophilic behavior with contact angles below 90° (53.81°, 72.70°, and 60.14°). Pure epoxy improved the values to 87.52°, 91.62°, and 85.94°, indicating partial hydrophobicity. The addition of SiO2 nanoparticles further increased the values above 100° (100.26°, 99.33°, and 101.33°). Based on the empirical correlation between contact angle and dielectric strength, dielectric performance improved from 124.4 kV/cm (uncoated) to 176.7 kV/cm (epoxy) and 200.4 kV/cm (epoxy-SiO2). The novelty of this work lies in demonstrating, for the first time, the comparative effectiveness of epoxy and epoxy-SiO2 coatings under real tropical contamination conditions. These findings confirm that epoxy-SiO2 coatings not only improve hydrophobicity but also provide a homogeneous protective layer, thereby reducing leakage current and strengthening dielectric endurance. The results highlight a cost-effective preventive maintenance strategy with both scientific and practical contributions for high-voltage transmission systems in tropical environments.
IoT-Based Image Segmentation and Fuzzy Mamdani for Ceramic Insulator Contaminant Identification Rahul Maryulis Putra; Yusreni Warmi; Arif Handika
Jurnal Ilmiah Telsinas Vol 9 No 1 (2026)
Publisher : Universitas Pendidikan Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.38043/telsinas.v9i1.7071

Abstract

Ceramic insulators on 150 kV transmission lines are prone to contamination from dust and moss, which can degrade insulation performance and increase the risk of system failure. This study aims to identify insulator contaminants using image processing techniques and Mamdani fuzzy logic integrated with an Internet of Things (IoT) platform to assess the dielectric strength of 150 kV ceramic insulators. The method involves capturing images of the insulator surface using a monocular digital microscope, applying OpenCV-based image processing for segmentation and quantification of contamination, and classifying contamination levels using Mamdani fuzzy logic. The results show that the system can accurately detect the percentage of dust and moss contamination. The processed image data are used as input to the fuzzy system to determine the dielectric strength of the insulator. Simulations demonstrate consistent classification of contamination into three levels: low, medium, and high. The system is integrated with the Ubidots IoT platform for real-time monitoring of insulator conditions. As contamination levels increase, the insulator's breakdown voltage decreases, with dust having a greater impact than moss, especially under high humidity conditions. The dielectric strength ranges from 45 kV to 110 kV, with values below 60 kV considered critical.
Co-Authors Arif Handika Martini Martini Putra, Andi M. Nur Rachmat Deska Saputra Rahul Maryulis Putra Sepannur Bandri