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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.
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 Desain Tangga Hidrolik Untuk Keselamatan Menaiki Unit Excavator Liebherr R9100 Ahmad Faisal Dwi Rohmawan; Nurhadi Nurhadi
JURNAL APLIKASI DAN INOVASI IPTEKS "SOLIDITAS" (J-SOLID) Vol 6, No 2 (2023): Jurnal Aplikasi Dan Inovasi Ipteks SOLIDITAS
Publisher : Badan Penerbitan Universitas Widyagama Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31328/js.v6i2.4831

Abstract

Kerusakan pada tangga alat berat rawan terjadi karena tangga pada spesifikasi unit terpasang pada chasis yang cenderung bertabrakan dengan material tambang sehingga mudah rusak. Tangga dengan bawaan unit juga menyulitkan kegiatan service dan memiliki potensi terjatuh dan terpeleset. Tujuan penelitian adalah mendesain tangga hidrolik pada unit excavator Liebherr R9100 dengan analisis perhitungan tangga hidrolik. Metode pengujian dengan melakukan perhitungan pada variasi sudut operasional tangga sebesar 1250, 1300, 1400 dan 1450 serta penambahan beban sebesar 0kg, 50kg dan 80kg sehingga diketahui tekanan oli dan daya pompa yang dibutuhkan agar piston cylinder dapat menggerakkan tangga hidrolik untuk posisi memanjang atau memendek. Hasil analisis pada penelitian berupa desain tangga hidrolik dengan analisis perhitungan tekanan terbesar pada sudut 1350 dengan penambahan beban 80kg sebesar 35,57 bar sedangkan untuk tekanan terkecil pada sudut 1300 dengan penambahan beban 0kg sebesar 32,577 bar. Daya pompa terbesar pada sudut 1350 dengan penambahan beban 80 sebesar 1,375 HP sedangkan daya pompa terkecil pada sudut 1300 dengan penambahan beban 0kg ebesar 1,26 HP.
ANALISIS DAN PEMASANGAN LISTRIK SURYA ATAP (LSA) SEBAGAI SUMBER ENERGI LISTRIK ALTERNATIF Nurhadi Nurhadi; Muhamad Rifa’i; Chandra Wiharya
Konferensi Nasional Pengabdian Masyarakat (KOPEMAS) #5 2024 Konferensi Nasional Pengabdian Masyarakat (KOPEMAS) 2020
Publisher : Konferensi Nasional Pengabdian Masyarakat (KOPEMAS) #5 2024

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

Abstract

Merebaknya wabah COVID 19 mulai pertengahan Maret 2020 menyebabkan produksi olahan rumput laut di UMKM Citara berhenti karena tidak adanya permintaan. Sebagai upaya ketahanan pangan, UMKM Citara mengembangkan budidaya ikan lele biofloc dan hidroponik (bioponik). Masalahnya budidaya ikan lele bioponik membutuhkan pompa air yang harus menyala 24 jam dengan biaya listrik yang cukup besar dalam jangka panjang, namun UMKM tidak memiliki sumber energi listrik alternatif sebagai penggerak pompa air tersebut. Kegiatan PkM ini bertujuan menganalisis dan memasang Listrik Surya Atap (LSA) yang memanfaatkan cahaya matahari sebagai sumber energi listrik alternatif di UMKM Citara Perumahan Taman Bhayangkara Indah D5, Desa Banjaarum Kec. Singosari Kabupaten Malang. Metode pelaksanaan kegiatan meliputi penghitungan beban listrik, penentuan jumlah panel surya, penentuan kapasitas baterai, pemasangan dan uji coba LSA. Hasil kegiatan adalah terpasangnya LSA di UMKM Citara dengan kapasitas panel surya 400 WP, kapasitas controller hybrid 850 VA, kapasitas baterai 200 AH, dan kapasitas keluaran baterai maksimum 160 AH. LSA mampu menghasilkan energi listrik sebesar 960 watt untuk 2 jam, atau 480 watt untuk 4 jam, atau 160 watt untuk 12 jam, atau 80 watt untuk 24 jam pemakaian. LSA mampu menggerakkan pompa air selam 24 jam.
DESAIN DAN PEMBUATAN KURSI AYUNAN UNTUK POS PENDIDIKAN ANAK USIA DINI Syamsul Hadi; Ach. Muhib Zainuri; Nurhadi Nurhadi; Nurchajat Nurchajat; Purwoko Purwoko
Jurnal Pengabdian kepada Masyarakat Vol. 12 No. 2 (2025): JURNAL PENGABDIAN KEPADA MASYARAKAT 2025
Publisher : P3M Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/abdimas.v12i2.9114

Abstract

Early childhood education of Melati Bangsa has only static arcades that still restrict the creativity of children in play as a limitation encountered. The purpose of community service is to facilitate children early age (less than 5 years) in order to build a game together in an exciting atmosphere in the swing chairs capacity of 6 children who are facing each other. Teachers or parents/guardians have responsibility of overseeing and swinging the swing chairs that can be accompanied by the providing of learning through the accompaniment of an interesting story, so learning can be more effective and achieve goals. Methods of community service include: survey with teachers and principal, the availability of areas for installation of swing chairs, design of swing chairs in accordance with the size of the students also anticipate the possiblility that must be strong if it is used by 4 adults, manufacturing swing chairs, painted steel construction and wood, mounting frame and chairs, foundation construction, and testing the chairs and installation of a chain lock. Results obtained in swing chair that can be used by 6 students and 1 teacher simultaneously while receiving lessons from teacher.
Rancang Bangun Sistem Keamanan Cerdas Sepeda Motor Berbasis IoT dengan Integrasi Aplikasi Telegram Muhammad Brian Putra; Nurhadi Nurhadi
AEEJ : Journal of Automotive Engineering and Vocational Education Vol 5 No 2 (2024): Vol 5 No 2 (2024): AEEJ : Journal of Automotive Engineering and Vocational Educat
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/aeej.v5i2.247

Abstract

Pencurian sepeda motor adalah kasus yang sering kali terjadi di Indonesia. Target utama dari pelaku pencurian ini biasanya tertuju pada kawasan, salah satunya adalah Kota Malang dan Kota Surabaya. Hal ini bukti bahwa sistem keamanan bawaan pabrik kurang efektif untuk keamanan sepeda motor, sehingga perlu inovasi yang mengembangkan sistem keamanan agar lebih optimal. Penelitian ini memiliki tujuan utama yakni merancang desain sistem keamanan smart security pada sepeda motor berbasi IoT dan terintegrasi dengan aplikasi Telegram. Jenis penelitian ini adalah RnD (Research and Development) dengan pembuatan desain, pembuatan sistem pengaman, pengujian kinerja alat. Hasil dari penelitian ini yakni sistem bisa mendeteksi gerakan mencurigakan yang dapat memberikan informasi kepada pengguna sehingga dapat memantau titik sepeda motor secara akurat setiap waktu, serta dapat menyulitkan pelaku tindak pencurian dengan mematikan mesin dan mengunci rem sepeda motor.
Co-Authors Ach. Muhib Zainuri Ahmad Faisal Dwi Rohmawan Anang Dasa Nofvowan Anang Dasa Novfowan Anton Setya Aji Herdiansyah Asfari Hariz Santoso Asrori Asrori Bakti Indra Bambang Hertomo Chandra Wiharya 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 Moh. Alfian Muhamad Rifa’i Muhamad Rifa’i Muhammad Brian Putra Muhammad Rifa'i Nunun Setyo Nadia Putri Nurchajat Purwoko Rahman Azis Prasojo Ridzki, Imron Rohmanita Duanaputri Ruwah Joto Sri Wahyuni Dali Sugeng Hadi Sukamdi Sulistyowati Sulistyowati Sungkowo, Heri Syamsul Hadi Yuniarto Agus Winoko