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PLN (Persero) is the state-owned company responsible for supplying electrical energy in Indonesia and plays a crucial role in ensuring the reliability and continuity of power distribution. Therefore, all electrical equipment, particularly power transformers, must be maintained in safe and reliable operating conditions. Transformers function to change voltage levels from high to low or vice versa and are essential components in the electric power distribution system. One important transformer component that requires periodic maintenance is the On Load Tap Changer (OLTC). To maintain transformer performance and extend its service life, routine maintenance activities such as OLTC oil replacement are necessary. PT. PLN (Persero) ULTG Rangkasbitung conducts regular OLTC oil replacement twice a year as part of its preventive maintenance program. Transformer oil serves as both an insulating medium and a cooling agent; therefore, its condition greatly affects transformer reliability and operational safety. Degraded oil quality can cause insulation failure and reduce transformer efficiency. This study aims to describe the procedure and implementation of On Load Tap Changer oil replacement at the transformer substation of PT. PLN (Persero) ULTG Rangkasbitung. The research method used is field research, carried out through direct observation and interviews with maintenance personnel. The results of this study are expected to provide a clear understanding of the OLTC oil replacement process, support proper maintenance practices, and emphasize the importance of transformer maintenance in ensuring the reliability and sustainability of the electric power system.

This study aims to find out about the procedure for measuring the isolation resistance of the main equipment of the 150 kV conventional substation (AIS) as many as 5 bays at the Panakkukang Substation through the measurement of the insulation resistance value in accordance with the predetermined standards. The method used in this study is quantitative descriptive. The subject of the study to be studied is a comparison of isolation resistance values in pre- and post-treatment. This was done to find out if there was a change in the insulation resistance value of the main equipment of the Substation. The main equipment studied is LA, PMT, CT, VT, and Transformer. Measurements were taken with a Megger measuring instrument, with a voltage injection of 5kV. For 5kV voltage injection, the maximum value of the test device is >1000 GΩ. The standard used is IEEE 43-2000, which is > 1 MΩ / 1 kV. Based on the results of research that has been carried out on each main equipment of the substation at GI Panakkukang. It can be concluded that the isolation resistance value in each main equipment of the substation at GI Panakkukang is above the minimum value (> MΩ/1 KV) in accordance with the IEEE Std 62: 1995 standard, VDE Catalogue 228/4, and the standard used by PLN in the "Power System Maintenance Guidebook" in 2014 the isolation resistance value at each main substation at GI Panakkukang has increased after being maintained. Maintenance can be carried out by cleaning the equipment body and foreign materials, and measuring the insulation resistance periodically.

A substation is a transmission installation that distributes power to a load in a certain area. The Sekayu 150 KV Substation is the center for controlling electrical power load requirements and functions as a center for securing electrical power system equipment and as a center for the normalization process for disturbances in the Sekayu transmission area. The electrical power distribution system does not rule out the possibility of disturbances, especially disturbances caused by nature. If there is an unpredictable disturbance, appropriate and reliable safety equipment (protection system) is needed to be able to increase the distribution of electrical power to the load (consumer).  

PLTU Banten 3 Lontar Merupakan salah satu Pembangkit Tenaga Uap yang berada di Lontar Kabupaten Tangerang Banten. PLTU Lontar ini milik anak buah PT. PLN (Persero) yaitu Indonesia Power yang memiliki 3 unit Pembangkit dengan kapasitas masing – masing unit Pembangkit sebesar 3 x 315 dengan Energi listrik yang dihasilkan PLTU Lontar akan disalurkan Jaringan Tranmisi 150 KV (SUTT) sepanjang 25 Kilometer ke Gardu induk Teluk Naga dan Gardu Induk New Tangerang untuk memperkuat pasokan tenaga listrik di area Jakarta, tangerang dan sekitarnya pada sistem kelistrikan di jawa. Dalam penggunaan peralatan di PT. Indonesia Power PLTU Banten 3 Lontar OMU yang berlangsung terus menerus sehingga sangat penting untuk memperhatikan kondisi peralatan proteksi dengan melakukan pemeliharaan dengan “Preventive Maintenance” agar peralatan dapat tetap berfungsi dengan baik. Pada kasus kerusakan peralatan Proteksi untuk saat ini belum terlihat adanya permasalahan yang terjadi pada kurangnya kinerja pengolahan batu bara pada Belt Conveyor. Mengingat sering terjadinya hal tersebut bahwa alat proteksi dalam suatu proses pengolahan batu bara. Maka dari pembahasan ini penulis melakukan penilaian terhadap data dilapangan sehingga mengetahui masalah pada suatu alat. Mengingat pentingnya dan besarnya manfaat dari pembahasan ini, maka penyusun tertarik membahas “Preventive Maintenance Kontrol intrumen Belt Conveyor C-7”.    

In transformers installed and used in electric power systems, especially at substations (GI) there are often disturbances or problems. One of the problems with the transformer can occur due to the failure of the insulating oil which can be caused by a decrease in the value of the translucent voltage, therefore it is necessary to carry out maintenance to prevent and localize interference. Tap Changer oil is different from oil in the main tank (in terms of placement), in terms of type and function Tap Changer oil with oil in the main tank has similarities from the type of oil and its function as insulation, cooling and protecting windings from oxidation. With the method of observation (observation) in the field of all equipment worked on and with the literature method can be known the process of replacing oil On Load Tap Changer. From the results of the oil translucent voltage test study, it is known that the value of the penetrating voltage of the On Load Tap Changer oil sample used in the transformer is an average value of 38.8 kV, it can be known that the value of the new oil penetrating voltage (sample 1) being filtered is 86.8 kV, the value of the new oil penetrating voltage (sample 2) being filtered is worth 88 kV, and the value of the new oil penetrating voltage (sample 3) being filtered is 98.2 kV.

Proses pemeliharaan pemutus tenaga (PMT) sangat penting dilakukan diantaranya pengukuran tahanan kontak, untuk mengetahui kondisi kontak PMT masih beroperasi dengan baik atau sudah perlu dilakukan perbaikan, serta tahanan pentanahan untuk mengetahui nilainya agar mencegah terjadinya tegangan kejut yang berbahaya bagi manusia dan peralatan. Dalam pengukuran tahanan kontak dan tahanan pentanahan pada objek PMT bay Cikarang I Gardu Induk 150 kV Jababeka telah dianalisis dan dilakukan perbandingan antara pengukuran dengan micro ohm meter dan perhitungan manual. Nilai tahanan kontak PMT pada masing-masing fasa R, S, T, sebesar 38 µΩ, 89 µΩ, 40 µΩ. Hal ini menunjukkan bahwa tahanan kontak pada PMT masih dibawah batas normal, menurut standar PLN sebesar R < 100 µΩ. Presentase kesalahan untuk perbandingan antara pengukuran tahanan kontak menggunakan micro ohm meter dengan perhitungan manual pada masing-masing fasa R, S, T sebesar dibawah 1%. Nilai pengukuran tahanan pentanahan PMT di setiap fasa R, S, T sebesar 0,23 Ω, 0,19 Ω, 0, 31 Ω. Hal ini menunjukkan bahwa sistem pentanahan masih baik, menurut standar PUIL 2000 sebesar ≤ 1 Ω.