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All Journal Telecommunications, Computers, and Electricals Engineering Journal Journal of Electrical Engineering, Energy, and Information Technology
Gani, Usman A.
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Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering

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THE TEST RESULTS AND CALCULATION OF THE EROR VALUE OF THE RATIO AND SATURATION POINT AT CURRENT TRANSFORMER FEEDER KUALA DUA SUBTATION Ilhamdi, Muhammad; Gani, Usman A.; Rajagukguk, Managam
Journal of Electrical Engineering, Energy, and Information Technology (J3EIT) Vol 11, No 3: December 2023
Publisher : Faculty of Engineering, Universitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/j3eit.v11i3.68704

Abstract

Electrical energy at this time is a very important need to meet the needs of humans, such as lighting, factory machinery, household electricity, and other needs. Electricity flowing from the plant is channeled through transmission lines to be distributed to low- and medium voltage customers. In the process of distributing electrical energy, a device is needed to lower the voltage, namely a transformer. For the purposes of measurement and protection in electrical installations, a current transformer is needed to convert the amount of current on the primary side of large-scale electrical installations into small-scale current quantities more precisely and accurately. Determine the accuracy class of the current transformer to be able to transform primary into secondary. The excitation current will cause deviations from the measurement results. This deviation is commonly known as a transformation error or ratio error. Every single current transformer that PLN will use must meet the criteria of the IEC 60044-1 standard. From the data manager of current transformers in 30 phases at the Kuala Dua substation, it can be concluded that the current transformers with a ratio of 300/5A, 400/5A, 500/5A and 600/5A, core metering accuracy classes of 0.2 S, 0.5, and 1, 5P and 10P protection core accuracy classes. With the maximum error of the metering core ratio of ±0.2%, ±0.5%, and ±1%, and the maximum error of the protection core ratio of ±3% and ±5%.
Study of Positioning Effect of Arrester Before and After FCO Next to Distribution Transformer Againts Lightning Surge Strikes Maulasa, Romi; Kurnianto, Rudi; Gani, Usman A.
Journal of Electrical Engineering, Energy, and Information Technology (J3EIT) Vol 12, No 1: April 2024
Publisher : Faculty of Engineering, Universitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/j3eit.v12i1.76152

Abstract

There are 2 methods of placing the Arrester and Fuse Cut Out (FCO) as protection at  distribution substation, namely the placement of the Arrester before the Fuse Cut Out (FCO) and the placement of the Arrester after the Fuse Cut Out (FCO). Each method has a different impact in overcoming the coming lightning implosion voltage disturbance. The purpose of this study is to determine the effect of arrester placement before and after FCO on distribution transformers on lightning surge interference, and to find out how the performance of arresters and FCO when lightning surge interference occurs. In this study there are three calculations, namely the calculation of the arrester placement before the FCO, the calculation of the arrester placement after the FCO and the calculation of the maximum protection distance of the lightning arrester with the transformer. The results of this study are the placement of the Arrester before the FCO, the surge voltage that passes to the primary side of the transformer is 53,8567 kV/ µs, this value is still below the transformer TID of 125 kV. Then in the Arrester placement after the FCO the surge voltage that passes to the primary side of the transformer is 58   kV/ µs, this value is still below the TID of the transformer of 125 kV. The maximum distance of arrester placement to the transformer is 14,1 m. The conclusion of this research is that the arrester works optimally in the two placements as for FCO does not work well in the Arrester placement after FCO.
ANALYSIS OF DISTRIBUTION TRANSFORMER LIFE BASED ON LOAD AT PT. PLN (PERSERO) PONTIANAK Pirniawan, Yoga; Gani, Usman A.; Rajagukguk, Managam
Telecommunications, Computers, and Electricals Engineering Journal (TELECTRICAL) Vol 2, No 1: June 2024
Publisher : Faculty of Engineering, Universitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/telectrical.v2i1.75928

Abstract

Energy needs in the city of Pontianak are increasingly growing along with population and industrial development. This can be seen from the growth rate of various types of consumer needs, including household, industrial, commercial consumers (shopping centers, entertainment centers, services), educational institutions and offices. A transformer is a static electromagnetic electrical equipment that functions to transfer and change electrical power. Distribution transformers have an important role in distributing electric power in the distribution system. International Electrotechnical Commission (IEC) 534 of 1972 states that if the transformer is loaded stably at its rated power with an ambient temperature of 20 °C, the transformer hot spot temperature will reach 98 °C and the life of the transformer will reach 20 years or 7300 days with losses. normal age 0.0137% per day. The average temperature around the city of Pontianak is 30 °C, so the transformer loading must be adjusted so that the distribution transformer's service life remains normal. There are more than 1000 distribution transformers in Pontianak for residential distribution transformers and industrial distribution transformers. Residential distribution transformers experience a shorter service life because the load usage on the distribution transformer is unstable. This is different from industrial distribution transformers where the usage load is constant. In industrial distribution transformers, there are transformers that are approaching overload with a usage load of 91.88%. The remaining service life is shorter than residential distribution transformers because the load is quite large.
Co-Authors Ilhamdi, Muhammad Managam Rajagukguk Maulasa, Romi Pirniawan, Yoga Rudi Kurnianto