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Model Power Sistem Stabilizer Berbasis Standar IEEE untuk Stabilitas Transien Sistem Tenaga Listrik Jamal, Agus
Jurnal Semesta Teknika Vol 13, No 1 (2010): MEI 2010
Publisher : Jurnal Semesta Teknika

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

Power System Stabilizers (PSS) are added to excitation systems, in order to enhance the damping of electric power system during low frequency oscillations. For large scale power systems comprising of many interconnected machines, the PSS parameter tuning is a complex exercise due to the presence of several poorly damped modes of oscillation. The problem is further being complicated by continuous variation in power system operating conditions. In the simultaneous tuning approach, exhaustive computational tools are required to obtain optim um parameter settings for the PSS, while in the case of sequential tuning, although the computational load is fewer, evaluating the tuning sequence is an additional requirement. There is a further problem of eigenvalue drift. This research proposes the PSS model based on IEEE Standard 421.5 PSS 4B for designing robust power system stabilizers for a multi machine system. Simulations were carried out using several fault tests at transmission line on a Two-Area Multimachine Power System. As a reference the PSS model, Delta w PSS and Delta Pa PSS has been used for comparison with the PSS under consideration. The result shows that power transfer response using the model is more robust than Delta w PSS and Delta Pa PSS, especially for three phase faults and phase to ground faults.

Loss Analysis of Propulsion System on an Electric Railway Jamal, Agus; Chamim, Anna Nur Nazilah; Putra, Karisma Trinanda; Lestari, Sri Indah; Jusman, Yessi
Journal of Electrical Technology UMY Vol 2, No 2 (2018)
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jet.2235

Electric Railway (KRL) is a train that is based on eletrification system. The electrification system in the KRL supplies electrical energy to the train locomotive and several other carriage units, so the train can run. Electrical energy can be either AC or DC source. There are two electrical systems to support the performance of KRL, propulsion system and auxiliary system. The propulsion system is a driving system and than the auxiliary system is the system that handles the electrical load on KRL. In this research, discuss about the loss of propulsion system on KRL LAA Electric DC, AC Traction Motor. The propulsion system consists of several components, such as pantograph, circuit breaker, capacitor filter, IGBT VVVF inverters and AC traction motors. The component has different losses and different efficiencies. There are five test conditions for AC traction voltage inputs of 160.5V, 321V, 493.9V, 635V and 645V. By calculating using equations, from the five test conditions it can be seen that the propulsion system has the lowest power loss with the highest efficiency at the input voltage of AC 635V traction motors, which obtained the power loss of inverter VVVF IGBT 41.996kW with the efficiency 90.67% and the power loss of AC traction motor 18.219kW with the efficiency 91.45%.

Electrical System Design and Installation of New Building, Aisyiyah University, Yogyakarta Suripto, Slamet; Jamal, Agus; Purwanto, Kunnu; Wicaksono, Wahyu Nugroho; Jusman, Yessi
Journal of Electrical Technology UMY Vol 2, No 3 (2018)
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jet.2337

Aisyiyah University New Yogyakarta Building is one of the commercial buildings that moves the field of education in Yogyakarta. The New Building of Aisyiyah University Yogyakarta consists of 10 floors, including the basement floor, main floor and roof floor. Electric loads installed at the New Building of Aisyiyah University Yogyakarta include lighting loads (lights) and power loads (sockets) and the power loads of electric motors (air conditioners, elevators and others), which of course requires a large enough electricity supply. Electricity installed in the New Building of Aisyiyah University in Yogyakarta is 1010.9 kVA. The power supplied is 800 kVA from State Electricity Company and the total power capacity of the transformer is 1000 kVA and a generator set with a capacity of 1000 kVA. Where the backup power supply system is fully supplied by the generator set.

Model Power Sistem Stabilizer Berbasis Standar IEEE untuk Stabilitas Transien Sistem Tenaga Listrik Jamal, Agus
Semesta Teknika Vol 13, No 1 (2010): MEI 2010
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v13i1.729

Power System Stabilizers (PSS) are added to excitation systems, in order to enhance the damping of electric power system during low frequency oscillations. For large scale power systems comprising of many interconnected machines, the PSS parameter tuning is a complex exercise due to the presence of several poorly damped modes of oscillation. The problem is further being complicated by continuous variation in power system operating conditions. In the simultaneous tuning approach, exhaustive computational tools are required to obtain optim um parameter settings for the PSS, while in the case of sequential tuning, although the computational load is fewer, evaluating the tuning sequence is an additional requirement. There is a further problem of eigenvalue drift. This research proposes the PSS model based on IEEE Standard 421.5 PSS 4B for designing robust power system stabilizers for a multi machine system. Simulations were carried out using several fault tests at transmission line on a Two-Area Multimachine Power System. As a reference the PSS model, Delta w PSS and Delta Pa PSS has been used for comparison with the PSS under consideration. The result shows that power transfer response using the model is more robust than Delta w PSS and Delta Pa PSS, especially for three phase faults and phase to ground faults.

Comparative Analysis of the Use of LED and HPS Lights in PT. Bukit Asam Hasibi, Rahmat Adiprasetya Al; Jamal, Agus; Surahmat, Indar; Hardiyanto, Tio; Jusman, Yessi; Arkan, Fardhan
Journal of Electrical Technology UMY Vol 3, No 3 (2019): September
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jet.3358

The lamp is the main construction facility in the company that serves as a support for the activities of the economic system and mobility in the company. An analysis of the difference between the use of LED lights with HPS lamps at PT. Bukit Asam Tbk. reference is used to recommend the use of appropriate (technical) lighting equipment for industrial areas and to obtain better cumulative costs and energy savings for the company in the future. In this study using the lamp replacement method with the same lumen level comparison. The goal is that later the level of lighting produced is the same for each lamp. From the results of this study it was found that the technical use of 70W, 150W, 250W and 400W HPS lamps has an efficacy level of 84 to 123 lm / W. Whereas the 80W, 200W, 300W, 450W LED lamps are 90 lm / W and the results of the cumulative value or the total cost of operating and maintenance costs for 15 years between HPS lamps versus the LED lights that occur is that in HPS lamps the total cost incurred amounting to 20,604,230,235 rupiahs while for LED lamps it is 27,787,386,324 rupiahs which can be seen that the use of more economical lighting is HPS lamps.

Analysis of Losses of propulsion systems on Electric Diesel Rail Trains Jamal, Agus; Chamim, Anna Nur Nazilah; Putra, Karisma Trinanda; Masfiyah, Nisfi Nurlailatul; Jusman, Yessi
Journal of Electrical Technology UMY Vol 2, No 3 (2018)
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jet.2338

Train is one of transportation which supports the mobilization of society. Futhermore, it is affordable and comfortable so that people prefer using it. One of trains which is usually used by many people is KRDE or electric diesel railway, which is an innovation of technology in PT. INKA based on railway industry. It is one of railway that need electricity as the main source of energy that comes from alternator. it will handle all power of load needs on KRDE like as propulsion and auxiliary load. Therefore, the fluency of KRDE is affected by electrical system of the railway, which is mostly affected by propulsion load because it needs bigger power than auxiliary load. In this research presents about losses calculation on KRDE that are Three- phase rectifier, Variable Voltage Variable Frequency (VVVF) inverter and Three phase induction motor. Three phase rectifier and VVVF inverter will simulated by PSIM software to understand how the circuit work. The results of this research are explain about the number of loss energy in three phase rectifier is 21,6 Watt. In VVVF inverter and three induction motor, there are five samples. From analysis of the samples result that VVVF inverter has the highest efficiency 95,53% with loss energy 19,992 KW, which on 645 Volt about output voltage and 90 Hz about output frequency. In three phase induction motor, 91, 426% is the highest efficiency and it has 18,211 KW at loss energy, which on 635 Volt about input voltage and 36,38 Hz about input frequency. Then, the highest efficiency of propulsion system is 94,59% and 53,38 KW about loss energy, which on 635 Volt about input voltage and 36,38 Hz about input frequency in induction motor.

Analysis of Power Transformer Insulation: A Case Study in 150 kV Bantul Substation Hidayat, Arief Rahman; Jamal, Agus; Chamim, Anna Nur Nazilah; Syahputra, Ramadoni; Jeckson, Jeckson
Journal of Electrical Technology UMY Vol 3, No 2 (2019): June
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jet.3254

Insulation of the transformer is one of the essential components. So that the quality of the resistance in the isolation of the transformer is essential to note the condition, in order to find out the condition of the transformer isolation, several tests must be performed, namely the polarization index, delta tangent, and break down voltage. In this study, all three tests were carried out on Transformer 1 in the 150 kV Bantul substation. Polarization index testing itself is testing the leakage current on the transformer isolation by comparing the test results for 1 minute with the results of the 10-minute drive test. While delta tangent is testing capacitive leakage current in the isolation transformer, and break down voltage is a test of the ability of the breakdown voltage in transformer insulation oil. Based on the results of the analysis, it can be seen that the value of the transformer polarization index in 2016 and 2018, the average value between the windings has been in the rating of 1.25-2.0. As for the delta tangent test results in 2016 and 2018, the value between the capacitive parts is already in the rating of 0.18% -0.36%. For the breakdown voltage test results in 2016 and 2018, the average breakdown voltage value is 43.9 kV/mm - 65.5 kV/mm. From these data, it can be concluded that the transformer isolation conditions in 2016 and 2018 are in good condition, although there was a decline in the transformer isolation conditions in 2016. However, the National Electric Company has made repairs and maintenance of the isolation transformer. This is seen due to an increase in the quality of transformer insulation in 2018. Repair and maintenance of transformer insulation are done to maximize the work system and the life of the transformer.

Unjuk-kerja Pembangkit Listrik Tenaga Hibrid Berbasis Mikrohidro dan Surya Syahputra, Ramadoni; Subarkah, Yudha Agung; Purwanto, Kunnu; Jamal, Agus
Semesta Teknika Vol 26, No 1 (2023): MEI
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v26i1.16284

Sumber energi terbarukan yang sangat potensial adalah energi mikrohidro dan surya. Dalam aplikasinya, diperlukan suatu pembangkit listrik berukuran kecil dengan beban listrik yang sesuai yang dapat digunakan secara fleksibel. Dalam penelitian ini dibahas performa pembangkit listrik hibrid tenaga surya dan mikrohidro portable. Pembangkit listrik hybrid tersebut dirancang dengan kapasitas maksimum 1100 watt. Pembangkit listrik yang dirancang adalah bersifat portable, sehingga dapat dibawa dan dipindahkan dengan mudah sesuai lokasi yang sesuai. Lokasi yang sesuai untuk operasional pembangkit listrik ini adalah saluran irigasi, sungai kecil, atau selokan dengan area terbuka. Hal ini dimaksudkan agar pembangkit listrik ini menghasilkan daya listrik yang optimal, karena selain mendapatkan aliran air untuk menggerakkan mikrohidro juga mendapatkan paparan sinar matahari yang cukup. Ujicoba pembangkit listrik ini telah dilakukan untuk uji tanpa beban dan menghasilkan keluaran tegangan yang memadai. Pengujian telah dilakukan untuk pulley turbin mikrohidro berukuran 45 mm dan 100 mm. Hasil pengujian menunjukkan bahwa pulley turbin mikrohidro berukuran 45 mm menghasilkan daya listrik yang lebih tinggi dibanding pulley 100 mm.

Optimalisasi Proses Akuntansi melalui Seminar Pembukuan Digitalisasi dengan Pembukuan Digital sebagai Solusi Modern Inayah, Nadia Kayla; Kurniawati, Rikke; Jamal, Agus; Putri, Surni Aulia; Putra, Verdiansyah Kharisma; Firdaus, Fikky
Nusantara Community Empowerment Review Vol. 3 No. 2 (2025): Nusantara Community Empowerment Review
Publisher : LPPM UNUSIDA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55732/s5rtp077

Seminar digitalisasi bertema “Optimalisasi Proses Akuntansi dengan Pembukuan Digital” diselenggarakan untuk meningkatkan literasi peserta mengenai manfaat dan penerapan pembukuan digital di era teknologi yang berkembang pesat. Kegiatan ini menggunakan metode penyuluhan tatap muka (offline) yang dilengkapi sesi diskusi interaktif. Hasil seminar menunjukkan adanya peningkatan pemahaman peserta tentang pentingnya digitalisasi dalam akuntansi, khususnya terkait efisiensi, akurasi, dan transparansi pengelolaan keuangan. Peserta juga mendapatkan panduan praktis mengenai implementasi sistem pembukuan digital beserta tantangan dan solusi yang mungkin ditemui dalam transisi dari pembukuan manual ke digital. Diharapkan melalui kegiatan ini, peserta mampu mengoptimalkan pemanfaatan teknologi digital dalam praktik akuntansi mereka, sehingga kualitas pengelolaan keuangan dapat meningkat secara menyeluruh. Kendati terdapat keterbatasan anggaran, seminar ini tetap berhasil memberikan landasan yang kuat bagi peserta dalam mengadopsi pembukuan digital, yang pada gilirannya dapat berkontribusi pada peningkatan efisiensi, transparansi, dan akuntabilitas pengelolaan keuangan di tingkat individu, UMKM, maupun komunitas. The digitalization seminar, themed "Optimizing Accounting Processes with Digital Bookkeeping," was held to increase participants' literacy regarding the benefits and application of digital bookkeeping in this rapidly evolving technological era. This activity utilized a face-to-face (offline) outreach method complemented by interactive discussion sessions. The seminar's results demonstrated an increased understanding of the importance of digitalization in accounting, particularly regarding efficiency, accuracy, and transparency in financial management. Participants also received practical guidance on implementing a digital bookkeeping system, along with challenges and solutions likely to be encountered in the transition from manual to digital bookkeeping. It is hoped that through this activity, participants will be able to optimize the use of digital technology in their accounting practices, thereby improving the quality of financial management overall. Despite budget constraints, the seminar still succeeded in providing a strong foundation for participants in adopting digital bookkeeping, which in turn can contribute to increased efficiency, transparency, and accountability in financial management at the individual, MSME, and community levels.

Implementation of the Smart & Green Building Concept in the UMY Student Dormitory Building Sukamta, Sukamta; Jamal, Agus; Utama, Nafi Ananda; Suryanto, Rudy; Subandono, Bagus; Budiyanto, Gunawan; Suryanto, Arwan
Berdikari: Jurnal Inovasi dan Penerapan Ipteks Vol. 13 No. 2: August 2025
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/berdikari.v13i2.28064

The design of student housing in the modern era is not only required to provide functional comfort but also to address the challenges of energy efficiency and environmental sustainability. Universitas Muhammadiyah Yogyakarta (UMY) responds to these needs through the development of a Student Dormitory that adopts the principles of smart and green building. The purpose of this community engagement program is to evaluate the implementation of intelligent and environmentally friendly building concepts from technical, functional, and operational economic perspectives. This program employs a case study method with a descriptive qualitative approach, based on the analysis of building technical documents and a review of relevant national and international scientific literature. The findings show that the integration of digital access control systems (smart access), energy-efficient VRV (Variable Refrigerant Volume) cooling, harmonic filters, solar water heaters, and the use of Panasap Blue Glass has significantly contributed to reducing energy consumption by up to 40%. In addition to enhancing residents’ comfort and security, these technologies also demonstrate potential investment payback within 5 to 7 years. The implications extend beyond cost and operational efficiency, contributing directly to the achievement of the Sustainable Development Goals (SDGs). Furthermore, this program is grounded on the principle of sustainability, emphasizing the long-term utilization of eco-friendly technologies, the principle of benefit, ensuring tangible advantages for students, the university, and the wider community through improved quality of life and reduced carbon footprint; and the principle of economic viability, guaranteeing operational cost efficiency and financial sustainability of the project. The strategic objectives of this community engagement initiative are (1) to establish UMY’s Student Dormitory as a model of environmentally conscious student housing in tropical regions, (2) to promote knowledge and technology transfer on smart and green buildings to other universities, (3) to strengthen UMY’s reputation as a modern campus aligned with the SDGs agenda, and (4) to create an energy-efficient housing ecosystem that contributes to long-term cost savings and improved residents’ well-being. In conclusion, the study indicates that UMY’s student housing model, based on smart and green building principles, is feasible to adopt as a reference for dormitory development in other higher education institutions, particularly in tropical areas

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