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Pengaruh optimalisasi maintenance terhadap On Load Tap Changer Transformator Daya 50 MVA 150/20 kV Sulistyowati Sulistyowati; Slamet Nurhadi; Dhimas Dhesah Kharisma
JURNAL ELTEK Vol 20 No 2 (2022): ELTEK Vol 20 No 2
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (356.005 KB) | DOI: 10.33795/eltek.v20i2.358

Abstract

Penyediaan energi listrik dengan yang kontinuitas penyaluran energi yang terjamin, dan kualitas tegangan yang baik sesuai dengan kebutuhan dunia industri perlu diperhatikan. Pengaturan tegangan (regulator tegangan) mutlak perlu dilakukan karena pengaruh tegangan input dari PLN selaku penyedia energi listrik yang fluktuatif, dan pengaruh perubahan beban yang berubah-ubah pada sisi konsumen. Adanya faktor diatas, penyesesuaian tegangan dengan cara melakukan perpindahan tap perbandingan kumparan dengan peralatan OLTC (On Load Tap Changer). Meningkatkan kinerja operasional dari on load tap changer dengan mengoptimalkan lagi program perawatan dan perbaikan (maintenance) yang terjadwal. Dengan maintenance yang terjadwal, dan memperbaiki faktor-faktor yang berpengaruh secara langsung terhadap OLTC, diharapkan dapat memperkecil jumlah perpindahan on load tap changer transformator, sehingga didapatkan life time yang lebih lama dalam artian life time dari kontak OLTC sebesar 100.000 untuk preventive maintenance, dan 500.000 untuk overhoule maintenance dapat dilampaui dengan waktu yang lebih lama, tanpa mengangu kehandalan serta fungsi dari peralatan itu sendiri. It is necessary to pay attention to the supply of electrical energy with guaranteed continuity of energy distribution, and good voltage quality in accordance with the needs of the industrial world. Voltage regulation (voltage regulator) absolutely needs to be done because of the influence of the input voltage from PLN as a provider of fluctuating electrical energy, and the influence of changing load changes on the consumer side. The existence of the above factors, voltage adjustment by changing the coil comparison tap with OLTC (On Load Tap Changer) equipment. The method used is by analyzing changes in load patterns, fluctuations in input voltage, and overall maintenance of power transformers. In accordance with the estimated life time of the transformer OLTC, the obtained life time is around 80 months and 25 days (6 years, 6 months, 25 days). And after the 80 months and 25 days have passed, the transformer and the on load tap changer device should be thoroughly serviced. When compared with manual tap changer operations, it can save up to 4 times the displacement of the tap changer in 1 hour or about 34560 times the displacement of the tap in 1 year and an improvement of 57.14% is obtained
Analisis Penggunaan Energi Listrik di Gedung Instalasi Bedah Sentral dan Perawatan Intensif Slamet Nurhadi; Heri Sungkowo; Nunun Setyo Nadia Putri
Elposys: Jurnal Sistem Kelistrikan Vol. 9 No. 2 (2022): ELPOSYS Vol. 9 No. 2 (2022)
Publisher : UPT - P2M POLINEMA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (198.64 KB) | DOI: 10.33795/elposys.v9i2.615

Abstract

Energy audit is a technique for calculating Energy Consumption Intensity (IKE) and aims to determine the energy use profile of a building and seek efforts to increase energy efficiency without reducing the comfort level of the building. The analytical method used is to make observations at Waluyo Jati Hospital by measuring the building area and ensuring appropriate lighting. Based on the Initial Energy Audit (AEA) which has been calculated and measured, the value of the intensity of energy has not met the standard because it is below the IKE standard for hospitals, which is 32.90617486 kWh/m2 on account calculations and 31.51399876 kWh /m2 on measurements that have been made, while the hospital IKE standard is 380 kWh/m2. The lighting system in the building still does not meet the standard of lighting strength according to the Regulation of the Minister of Health of the Republic of Indonesia No. 7 of 2019 concerning hospital environmental health. And for the lighting system it is not optimal and efficient, where the power consumption before repair according to the calculation is 4343.04 kWh, while after repair it becomes 4181.76 kWh / month 4343.04 kWh. The way to make energy use more efficient is to utilize natural light from the sun and change lamps and install energy-saving stickers in every corner of the room in the Central Surgical Installation and Intensive Care building at Waluyo Jati Kraksaan Hospital
Desain Closed-Loop Boost Converter Berbasis Voltage Lift Cell Untuk Implementasi Penguat Tegangan Masramdhani Saputra; Asfari Hariz Santoso; Slamet Nurhadi; Imron Ridzki; Sri Wahyuni Dali
Elposys: Jurnal Sistem Kelistrikan Vol. 9 No. 2 (2022): ELPOSYS Vol. 9 No. 2 (2022)
Publisher : UPT - P2M POLINEMA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (825.068 KB) | DOI: 10.33795/elposys.v9i2.619

Abstract

In this new era the use of Photovoltaic (PV) is increasingly being used as an energy source. However, this technology has a drawback, namely, the intensity of the sun's light is always changing every time. This can cause the output voltage of the Photovoltaic (PV) Cell to be variable or indeterminate. In the Photovoltaic (PV) Cell, a dc-dc converter circuit is needed which functions to regulate and change the output of the Photovoltaic (PV) Cell. Conventional DC-DC boost converters are unable to provide a high step-up voltage boost due to the effects of switching power, rectifier diodes, and equivalent series resistance of inductors and capacitors. In this study, a closed loop design using a PID controller and analysis of a non-isolated boost dc-dc converter based voltage lift technique were carried out to achieve a high step-up voltage gain. In the presented converter two inductors, three capacitors and three power diodes are used. From this structure, this converter is referred to as a voltage lift cell-based boost converter. The structure of the presented converter is considered very simple, since it has only two stages of power. The voltage and current equations of each element with the converter voltage gain under continuous conduction mode (CCM) were extracted. In addition, the steady state analysis of the amplified stress and boundary conditions is discussed in this study. This boost converter circuit is simulated through the PSIM application. From the simulation results in the PSIM application, it is found that the boost converter circuit is able to increase the voltage from 100 V to 400 V and has an error value of 0. The specifications of the simulation results are a duty cycle of 0.6, and a frequency of 10,000 Hz.
Evaluasi Kinerja Sistem Isolasi Transformator Kertas Kraft Terendam Minyak Mineral Pada Sel Uji Penuaan Termal Dipercepat Rahman Azis Prasojo; Kresna Bayu Priambodo; Anton Setya Aji Herdiansyah; Rohmanita Duanaputri; Slamet Nurhadi; Epiwardi
Elposys: Jurnal Sistem Kelistrikan Vol. 9 No. 3 (2022): ELPOSYS vol.9 no.3 (2022)
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (684.286 KB) | DOI: 10.33795/elposys.v9i3.640

Abstract

The transformer insulation system in the form of oil-immersed paper, is the most important part of a transformer. This isolation system needs to be ensured that it has the appropriate characteristics, and is resistant to stress due to transformer operation. The most commonly used method for evaluating insulation life is the accelerated thermal aging test. Insulating oil-immersed paper is sealed in a vessel with a ratio in the Accelerated Thermal Aging Chamber with a volume capacity of 3600 ml. It takes about 3000 ml of oil to be poured into a tube with a ratio of insulating oil to insulating paper rolled on copper which is 10:1 and then heated in a thermal oven to accelerate aging. This study aims to develop an Accelerated Aging Chamber for evaluating the performance of transformer isolation systems. The developed test cell is able to reach a set-point of 150°C in 16 minutes with on/off control while PID control in 37 minutes with a Human Machine Interface for monitoring and collecting temperature data in real time, and maintaining that temperature until the end of the experimental period. Theresults of the sample will later be tested for the characteristics of the transformer insulation, namely tensile strength, color scale, andbreakdown voltage due to thermal stress.
Kapasitor Shunt Sebagai Korektor Tegangan Bus di Gardu Induk Muhammad Fahmi Hakim; Slamet Nurhadi; Hanifiyah Darna Fidya Amaral; Satria Luthfi Hermawan
Elposys: Jurnal Sistem Kelistrikan Vol. 10 No. 1 (2023): ELPOSYS vol.10 no.1 (2023)
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (732.277 KB) | DOI: 10.33795/elposys.v10i1.915

Abstract

Segoromadu Substation has two busbars, namely busbar A and busbar B. Busbar A which has nominal voltage of 150 kV has reached a voltage value of 129.38 kV or experienced voltage drop of 13.75%. The percentage of this voltage drop exceeds a predetermined standard. Therefore, it is necessary to design a shunt capacitor which is then modeled and simulated. Based on calculation and analysis result, capacity of shunt capacitor that should be installed on Bus A is 50 MVAR. After the shunt capacitor was installed, based on simulation, there was an increase of 4.87 kV so the voltage afterward became 139.67 kV or only experienced a voltage drop of 3.19%. So, by installing a shunt capacitor with capacity of 50 MVAR, it can increase busbar voltage of the substation. The shunt capacitor also increases the value of reactive power and current flowing to the busbar.
Upaya Peningkatan Keandalan Penyulang dengan Manuver Jaringan Slamet Nurhadi; Muhammad Fahmi Hakim; Ruwah Joto
Elposys: Jurnal Sistem Kelistrikan Vol. 10 No. 1 (2023): ELPOSYS vol.10 no.1 (2023)
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (737.032 KB) | DOI: 10.33795/elposys.v10i1.916

Abstract

The Tlogosari feeder was disturbed 20 times so that the reliability of system wasn’t said to be good. The purpose of this research was to make efforts to increase reliability and reduce ENS by maneuvering the network and adding CO Branch. Hoped that after these efforts the reliability level of Tlogosari Feeder will be better and ENS will be as minimal as possible. The network maneuver is carried out by delegating part of Tlogosari Feeder load when it experiences a disturbance to the nearest feeders on the condition that the total load current after the maneuver doesn’t exceed the current setting and conductor ampacity. The addition of CO Branch is based on fault data to localize fault points to reduce transformer outages. After performing network maneuvers and adding CO Branch in the sub-networks, it was found that the SAIDI and SAIFI values were improved and the ENS was reduced. Network maneuvering and addition of CO Branch are quite effective in implementing the Tlogosari Feeder.
DESAIN DAN UJI PERFORMA TRAFO TOROID SATU FASA PADA APLIKASI INVERTER BERBASIS EGS002 Slamet Nurhadi; Masramdhani Saputra; Anang Dasa Nofvowan
Jurnal Teknik Ilmu dan Aplikasi Vol. 3 No. 2 (2022): Jurnal Teknik Ilmu dan Aplikasi
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

nverter Satu-Fasa dengan trafo frekuensi rendah merupakan jenis topologi yang paling banyak digunakan pada saat ini. Berbagai aplikasi mulai dari bidang energi terbarukan hingga kalangan peminat power amplifier musik juga menggunakan topologi ini. Keunggulan topologi ini adalah jumlah komponen elektronika daya yang lebih sedikit dan rangkaian kendali yang cukup sederhana. Komponen utama pada topologi inverter ini adalah trafo frekuensi rendah. Pada topologi inverter ini, trafo berfungsi sebagai komponen utama untuk menaikkan dengan sinus 12 V menjadi 220 V rms. Permasalahan yang muncul adalah suhu trafo yang meningkat drastis akibat riak arus yang dihasilkan oleh rangkaian inverter. Penulis menemukan aplikasi di lapangan tidak memperhatikan faktor geometri trafo serta derating dari dayanya. Oleh karena itu, pada penelitian ini, diusulkan suatu metode pembuatan trafo toroid baru beserta uji performanya untuk memperbaiki kinerja dari topologi inverter satu fasa dengan trafo frekuensi rendah. Hasil penelitian telah diverifikasi dengan implementasi laboratorium. Uji dari transformator yang dirancang menggunakan inverter satu-fasa berbasis pengendali modul EGS002.
Analisis Penyebab dan Solusi Masalah Durasi Overhaul Dump Truck Komatsu HD 785-7 Tidak Sesuai Rencana Akhmad Abdul Latif; Nurhadi Nurhadi
Rekayasa Material, Manufaktur dan Energi Vol 6, No 2: September 2023
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v6i2.15916

Abstract

Dump Truck is one of the heavy equipment that functions to transport materials such as soil and coal. For this machine to always be in the best condition, periodic maintenance is required, one of which is overhaul maintenance. There are various types of overhaul work on the Komatsu HD 785-7 dump truck unit. Even though there was good planning before the work started, there were still problems with the duration of the Komatsu HD 785-7 overhaul dump truck work which was not in accordance with the initial plan and resulted in the company as a heavy equipment rental service provider losing money. The purpose of this study is to analyze the causes of the duration of work on the Komatsu HD 785-7 dump truck overhaul and provide a solution as a recommendation or reference for the company. The method used is descriptive quantitative method. Descriptive quantitative methods are used to understand an event regarding the duration of an overhaul that is not according to plan in depth, by describing and explaining the characteristics of the incident. Collecting data by interviewing workers, observing in the field, distributing questionnaires and archives of previous overhaul work documents. The results of the study show that the main cause of the duration of work that is not according to plan is the arrival of spare parts or major components not according to schedule, and the addition of work accompanied by the addition of spare parts. The solution provided is to schedule joint inspection work to be carried out earlier with the aim of being able to find out the additional spare parts needed so that the ordering time can be made earlier and the waiting time for spare parts supply can be reduced.
Power Line Carrier (PLC) sebagai Media Pendeteksi Phasa Pelanggan Tegangan Rendah Anang Dasa Novfowan; Mochammad Mieftah; Wijaya Kusuma; Slamet Nurhadi
Elposys: Jurnal Sistem Kelistrikan Vol. 10 No. 3 (2023): ELPOSYS vol. 10 no. 3 (2023)
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/elposys.v10i3.4166

Abstract

With so many distribution substations and the number of household customers, most of whom are single-phase low voltage customers, customer phase verification becomes very important in the load balancing proces. The customer phase detection system that has been studied previously, using radio frequency communication media over the air, is considered less valid if used in border areas between 2 (two) distribution substations. It is felt that the low voltage customer phase detection method will be more valid if it is carried out via Power Line Carrier (PLC) media, namely data communication via electrical lines. And this system consists of two devices, namely a transmitter (called the Master) which is installed on the LV Panel and a receiver (called the Slave) which is carried by the mobile to the detected phase point Short distance phase detection using Power Line Carrie from transmitter to receiver has a 100% success rate in one sub-panel with a transfer speed of 9600 baudrate, with an average detection time for short distances of 5 seconds. For long distance detection, sometimes the detection time is relatively long (± 120 seconds) or even failed, possibly due to the quality of the connection along the conductor being detected, thus causing noise in the network.
Uji Performa Trafo E-I dengan Variasi Rapat Fluks pada Sumber Tegangan Non-Sinusoidal Slamet Nurhadi; Anang Dasa Nofvowan; Ika Noer Syamsiana; Yanik Lailinas Sakinah; Masramdhani Saputra; Mochammad Nur Rochman
Elposys: Jurnal Sistem Kelistrikan Vol. 10 No. 3 (2023): ELPOSYS vol. 10 no. 3 (2023)
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/elposys.v10i3.4547

Abstract

In the industrial field, transformers are used as a step-up voltage and are used as a step-down level. In a loaded transformer, the power that comes out of the transformer (transformer output power) is not always 100% because there are losses when channeling to the load. Both losses caused by current flowing in the copper wire, losses caused by alternating flux in the iron core, and losses caused by Eddy current in the iron core which result in the outgoing power (output power) from the transformer to the load is not the same as the incoming power (input power) to the transformer. This is known as the efficiency of the transformer. From these problems, the solution offered is to design and implement a transformer using an EI-shaped iron core which is arranged alternately which aims to prevent the occurrence of Eddy Current what happens in the coresolid by applying to the inverter. From the test results of the transformer, it can be concluded that the difference in flux density in the transformer when it is loaded will affect efficiency. The smaller the flux density of the transformer, the better the efficiency, while the greater the flux density of the transformer, the lower the efficiency.
Co-Authors Ahmad Faisal Dwi Rohmawan Akhmad Abdul Latif Amaral, Hanifiyah Darna Fidya Anang Dasa Nofvowan Anang Dasa Novfowan Anton Setya Aji Herdiansyah Asfari Hariz Santoso Asrori Asrori Bakti Indra Bambang Hertomo Chandra Wiharya Chandra Wiharya Dhimas Dhesah Kharisma Epiwardi Fahmi Hakim, Muhammad FATHUR ROHMAN Hari Sucipto IRWAN HERYANTO ERYK Jane Seva Anwar Muhardi Kasijanto - Khambali Khambali Kresna Bayu Priambodo Lisa Agustriyana Masramdhani Saputra Mochammad Mieftah Mochammad Nur Rochman Moh. Alfian Muhamad Rifa’i Muhammad Rifa'i Nunun Setyo Nadia Putri Rahman Azis Prasojo Ridzki, Imron Rohmanita Duanaputri Ruwah Joto Satria Luthfi Hermawan Sri Wahyuni Dali Sugeng Hadi Sukamdi Sulistyowati Sulistyowati Sungkowo, Heri Wijaya Kusuma Yanik Lailinas Sakinah Yuniarto Agus Winoko