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All Journal Jurnal Fortech Jurnal FORTECH
Sarwo Widagdo, Reza
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Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering

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Journal : Jurnal FORTECH

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Analisa Keandalan Transformator Distribusi Menggunakan Weibull Distribution di Wilayah ULP Rungkut Kota Surabaya Adi Satrio, Aisahdan; Slamet, Puji; Sarwo Widagdo, Reza
Jurnal FORTECH Vol. 2 No. 2 (2021): Jurnal FORTECH
Publisher : FORTEI (Forum Pendidikan Tinggi Teknik Elektro Indonesia)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56795/fortech.v2i2.203

Abstract

The reliability of the electric power system is very important in the continuity of the supply of electrical energy to the load. One of the important parts in the electric power system is the transformer. Maintaining the reliability of the transformer is an effort to make electrical energy channeled properly. For this reason, efforts are needed to evaluate whether the transformer is in good condition or not by using the Weibull distribution. By looking at the average failure rate, the MTTF value is used as a benchmark for reliability. It is based on the number of disturbances that cause the transformer to fail to operate. The results of the reliability analysis with the Weibull distribution on distribution transformers in the Rungkut ULP area during the time span from 2019, 2020, 2021 obtained an average failure rate of 18.321894% per year, with an MTTF value of 0.054579 per year, so the value reliability obtained 0.981. So according to Croanbach alpha, this value belongs to a very reliable level.
Analisa Koordinasi Proteksi Feeder Lakarsantri pada Transformator II 50 MVA GIS Karangpilang Sarwo Widagdo, Reza; Budiono, Gatut; Tasmono, Hadi
Jurnal FORTECH Vol. 2 No. 2 (2021): Jurnal FORTECH
Publisher : FORTEI (Forum Pendidikan Tinggi Teknik Elektro Indonesia)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56795/fortech.v2i2.206

Abstract

In the event of a short circuit interruption it is still very worrying where there are still many problems with protection equipment that does not work properly. In field conditions, the transformer at GIS Karangpilang often fails to disconnect the feeder. Based on this incident, it will be discussed how to coordinate the relay between incoming and Lakarsantri feeders. The calculation results from the working time of the relay feeder are 0.3 seconds with the working time on the incoming part being 0.68 seconds. Based on data from GIS Karangpilang, the working time of the relay in the feeder section was 0.41 seconds and 0.69 seconds in the incoming section with a fault current of 4.5 kA showing good results. In the short circuit simulation results, the manual calculation data and the data obtained from the Karangpilang GIS are not much different, where the working time of the relay feeder is 0.11 seconds faster than the incoming working time, with a time of 0.7 seconds which is in accordance with the relay settings.
Co-Authors Adi Satrio, Aisahdan Gatut Budiono Puji Slamet, Puji Tasmono, Hadi