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All Journal Prosiding Seminar Nasional Teknik Elektro, Sistem Informasi, dan Teknik Informatika (SNESTIK)
Trisna Wati
ITATS
Computer Science & IT Electrical & Electronics Engineering

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Perkiraan Sisa Umur Transformator Distribusi 20 KV di Perusahaan Bumi Waras Group Wahyu Triatmoko; Trisna Wati
Prosiding Seminar Nasional Teknik Elektro, Sistem Informasi, dan Teknik Informatika (SNESTIK) 2023: SNESTIK III
Publisher : Institut Teknologi Adhi Tama Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/p.snestik.2023.4119

Abstract

Each distribution transformer has a design age determined by the manufacturing company so that the International Electrotechnical Commission (IEC) 354 of 1972 states that if the transformer is loaded stably at its rated power with an ambient temperature of 20 oC, the hot spot temperature of the transformer will reach 98 oC and the life of transformer will reach 20 years or 7300 days with a normal age shrinkage of 0.0137% per day. The cause of the transformer experiencing shrinkage is the loading and ambient temperature. The temperature around the cities of Sidoarjo and Mojokerto has a room temperature of around 30 oC which will cause the transformer to experience a decrease in age. The research method used in this study is a mathematical method. The data used in this research are loading data and cooling oil temperature for 2 PT transformers. Tunas Baru Lampung, Tbk and 3 transformers PT. Alu Script Pratama and the temperature of the environment around the cities of Sidoarjo and Mojokerto. Based on the research results, it was found that the remaining life of the PT. Tunas Baru Lampung, Tbk transformer 1 has a remaining age of 9,921 years and transformer 2 has a remaining age of 9,986 years, for transformer PT. Alu Aksara Pratama transformer 1 has a remaining age of 18,216 years, transformer 2 has a remaining age of 18,266 years and transformer 3 has a remaining age of 9,654 years.
Analisa Sistem Proteksi Petir Pada Jaringan Transmisi 70-30 Kv Gi Dolopo - Golang Fatkur rohman rohman; Trisna Wati
Prosiding Seminar Nasional Teknik Elektro, Sistem Informasi, dan Teknik Informatika (SNESTIK) 2023: SNESTIK III
Publisher : Institut Teknologi Adhi Tama Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/p.snestik.2023.4138

Abstract

On the 70-30 kV Dolopo-Golang transmission network, the disturbance data due to lightning surges is quite high, reaching 642/year. Based on the IEEE standard used in this study, the data is quite large in terms of disturbances from lightning strikes. Therefore, the potential disturbance caused by lightning is in dire need of attention. Calculations were carried out using the Anderson method as an IEEE standard. The results of the analysis and calculations carried out using the MATLAB m-file indicated that the SFFOR values in the transmission network for the 150 Kv GI from Ngimbang to Mliwang conductors in 2018-2020 for the number of plates 7-9 were 10,264, 50,975, and 50,975 disturbances/100km/year. These values were still relatively high compared to the IEEE standard of 0.05 disturbances/100km/year. Consequently, the protection system of GI 150 KvNgimbang-Mliwang must be evaluated for the sake of isolator plate improvement. The values of SFFOR and BFOR must be reduced because the greater the number of isolator discs, the greater the optimal lightning impulse voltage capability that the isolator disc can withstand. The number of discs 7 to 9 could only be applied to GI 70 kV Dolopo-Golang 1 and GI 70 kV Dolopo-Golang 2 because two of the flashover values from the three available years (2018-2020) had values less than or equal to 0.05
Co-Authors Fatkur rohman rohman Wahyu Triatmoko