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Journal : Jurnal Ilmiah Dinamika Rekayasa (DINAREK)

Penentuan Kapasitas Daya Reaktif Dan Frekuensi Tuning Filter Pasif Untuk Mengurangi Kandungan Arus Harmonik Beban Prasetijo, Hari
Dinamika Rekayasa Vol 4, No 2 (2008): Dinamika Rekayasa - Agustus 2008
Publisher : Jenderal Soedirman University

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Abstract

This studi involve decresing method of harmonic current content in a radial distribution systems used single?tuned passive filter. The distribution systems model consist of transformer 20/0,4 kV supplying groups of non?linier loads that is represented by personal computer (PC) and fluorescent lamp 2x40 W as load harmonic?current source. Passive filter was installed in PCC bus (0,4 kV) and analysis to be conducted according to?IEEE std.1531-2003 and IEEE std. 519-1992. The reesult showed that insalation passive filter in PCC bus?will decrease magnitut load harmonic current significantly. The decreasing determined by reactive power?capacity and frequency tunning of passive filter.
Penentuan Pembebanan Maksimum Transformator Daya Yang Menyuplai Personal Computer (PC) Prasetijo, Hari; Susilawati, Hesti
Dinamika Rekayasa Vol 5, No 2 (2009): Dinamika Rekayasa - Agustus 2009
Publisher : Jenderal Soedirman University

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Abstract

Personal computer is electronic equiment that use solid state device, such as rectifiers, so it to be source of harmonic current.?Harmonic current is sinusoidal current with multiple frequency of fundamental current which will be increase power losses because?increasing effective current and frequency. In electric distribution system, transformer is component with highest power losses. They are?consit of DC losses (Pdc) that influence by effective current, eddy current (PEC) and other stray losses (POSL) which influence by effective current and their frequency. This study involved increasing transformer power losses with assume that transformer supply in full load condition to personal computer. Analyzes following IEEE Std. C57.110-1998 with comparing determination maximum?transformer loading use current spectrum from spectrum analyzer equipment and conversion produce Mathlab from current wave time?domain to current wave frequency domain. The result are maximum transformer loading is 97,84 use spectrum analyzer and 97,84 use Mathlab sofware.
Perencanaan Sistem Distribusi Dengan Analisa Aliran Daya Prasetijo, Hari
Dinamika Rekayasa Vol 3, No 1 (2007): Dinamika Rekayasa - Februari 2007
Publisher : Jenderal Soedirman University

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Abstract

This paper presents system distribution planning study with minimum investment base for 10 years. The planning will begin from existing condition (first year) and shows migration of system growth from first year  until tenth year. The planning constrain are voltage criteria and equipment capability. The study use  distribution power flow analysis as metode. The result of this study is distribution power flow analysis can  predict equipment profile that out of criteria and this condition make the planning more efective.
Generator Magnet Permanen Sebagai Pembangkit Listrik Putaran Rendah Prasetijo, Hari; Ropiudin, Ropiudin; Dharmawan, Budi
Dinamika Rekayasa Vol 8, No 2 (2012): Dinamika Rekayasa - Agustus 2012
Publisher : Jenderal Soedirman University

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Abstract

Development renewable energy as electrical energy need to be followed by provision of low speed generator, especially for?small-scale use of alternative energy. This study discusses the design of low speed synchronous generator using permanent magnets?for producing magnetic flux in the rotor. Stator coils are designed so that on the rotation of 500 rpm generator can produce 5 watts?output power at 3 phase voltage 12 Vac.
Studi Potensi Pembangkit Listrik Tenaga Mikro Hidro (PLTMH) Di Aliran Sungai Desa Kejawar Banyumas Harto Jawadz, Unggah Rizki; Prasetijo, Hari; Purnomo, Widhiatmoko Herry
Dinamika Rekayasa Vol 15, No 1 (2019): Dinamika Rekayasa - Februari 2019
Publisher : Jenderal Soedirman University

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Abstract

Desa Kejawar memiliki sumberdaya air yang dapat dimanfaatkan sebagai pembangkit listrik tenaga mikro?hidro (PLTMH). Ketersediaan mercu bendung saluran pembawa, dan bak pengendap menjadi faktor utama diadakannya?penelitian ini. Metode yang digunakan dalam pengumpulan data primer berupa head yaitu dengan pengukuran langsung?di lokasi perencanaan pembangunan PLTMH dan didapatkan hasil pengukuran head efektif setinggi 3,08m.?Pengumpulan data sekunder berupa curah hujan, iklim, dan DAS sebagai perhitungan untuk debit andalan diperoleh?hasil 0,05 ?3/?. Kapasitas daya dalam perencanaan pembangunan PLTMH ini sebesar 1,36 kW. Berdasarkan simulasi?menggunakan aplikasi TURBNPRO 3.0 turbin yang digunakan bertipe kincir dan alternator 3 kW. Total investasi yang?dibutuhkan dalam perencanaan pembangunan PLTMH sebesar Rp. 31.699.531 dengan umur proyek selama 10 tahun.?Kelayakan proyek perencanaan pembangunan PLTMH diperoleh nilai NPV pada discount factor 10% sebesar Rp.?37.063.244>0, BCR sebesar 2,1>1, PP selama 3,46 tahun < 10 tahun, IRR pada discount factor 34% sebesar 33,6%.?Berdasar pada evaluasi proyek, dapat dikatakan perencanaan pembangunan PLTMH di aliran sungai Desa Kejawar?layak dilakukan
Analisis Unjuk Kerja Prototip Sistem Pengiriman Daya Nirkabel Jenis Resonansi Magnetik Menggunakan Inverter Setengah Jembatan Dan Kumparan Helix Suroso, Suroso; Prasetijo, Hari; Nugroho, Daru Tri; Qosim, Marlin Ibnu
Dinamika Rekayasa Vol 14, No 2 (2018): Dinamika Rekayasa - Agustus 2018
Publisher : Jenderal Soedirman University

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Abstract

Makalah ini menyajikan hasil perancangan, pengujian dan analisis unjuk kerja prototip sistem?pengiriman daya nirkabel menggunakan inverter setengah jembatan dengan teknik resonansi magnetik frekuensi 100?kHz. Pengiriman daya menggunakan rangkaian resonansi magnetik bekerja memindahkan energi listrik dari rangkaian?pengirim ke rangkaian penerima melalui resonator yang beroperasi pada frekuensi resonansi. Pada penelitian ini?bagian pengirim dan penerima menggunakan kumparan kawat tembaga berdiameter 1,2 mm berbentuk kumparan helix?dengan diameter kumparan 10 cm. Catu daya pengirim menggunakan sumber DC 12 V dan dihubungkan dengan?inverter setengah jembatan. Sisi penerima dihubungkan dengan rangkaian penyearah diode yang dilengkapi dengan?filter untuk mendapatkan tegangan DC. Rangkaian inverter dibuat menggunakan saklar semikonduktor daya?MOSFET. Berdasarkan hasil pengujian prototip di laboratorium diperoleh bahwa efisiensi pengiriman daya berkurang?terhadap jarak. Semakin jauh jarak antara kumparan pengirim terhadap kumparan penerima, maka efisiensinya?menurun. Frekuensi sinyal yang dikirim relatif tetap meskipun jarak kumparan pengirim terhadap kumparan penerima?berubah. Sudut antara kumparan penerima terhadap kumparan pengirim yang memberikan efisiensi terbaik adalah 00.?Selain itu, untuk hasil pengujian ketika terdapat media yang bersifat isolator di antara kumparan pengirim dan?penerima maka transfer daya tidak terganggu. Tetapi ketika terdapat media konduktor maka daya akan terserap oleh?konduktor tersebut sehingga efisiensi semakin kecil.
Analisis Kerja Rele Overall Differential pada Generator Unit I PLTA Ketenger PT Indonesia Power UBP Mrica Prasetijo, Hari; Romadhona, Firman Arif
Dinamika Rekayasa Vol 6, No 2 (2010): Dinamika Rekayasa - Agustus 2010
Publisher : Jenderal Soedirman University

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Abstract

Plant has two important equipment that are the generator and transformer. Therefore, it should be protected well by the?overall differential relay. This relay must be reliable from the disturbances that might arise. In this study a simulation was conducted?to obtain and test the overall differential relay setting at generator unit 1 PLTA Ketenger. Modelling was done with MATLAB?Simulink 7.0.1 to check the overall differential relay protection system from potentialproblems. The model was given several?disturbances, namely 1) short circuit fault in the security area, 2) short circuit fault outside the security area, and 3) lightning?disturbances when damaged arrester. From the simulation results, the overall differential relay operating current is 1.73 A (primary?side) and 1.64 A (secondary side). The results show that the overall differential relay provides a good response, except in the lightning?fault with a current above 9x109 A (going the mismatch). For handlingthis problem another arrester should be added.
Optimasi Operasi Pembangkit Listrik Tenaga Air (PLTA) Menggunakan Linear Programming Dengan Batasan Ketersediaan Air Winasis, Winasis; Prasetijo, Hari; Setia, Giri Angga
Dinamika Rekayasa Vol 9, No 2 (2013): Dinamika Rekayasa - Agustus 2013
Publisher : Jenderal Soedirman University

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Abstract

One of hydro power plant operational problem is how to maximize available water resouces to gather optimal electric?power generation. Water availability which is limited and can be stored in a reservoir will influence electrical energy generated by?the plant. This paper present a new approach of short term optimization of hydro power plant operation. The objective function is?to maximize energy which is produced by power plant on scheduling operation period, with consider water resource availability in?reservoir as operational constraint. The optimization problem is formulated in Linear Programming Method, in which this method?is a commonly used to solve optimization problem in hydro power plant. Based on simulation results on Ketenger Hydro Power?Plant using water flow data on June 1st 2013 shows that this method can be used to solve hydro power plant operation optimization?problem well. Electrical energy as main objective function is maximized and all prevailing constrain is satisfied. On this short term?operation (24 hour) simulation, total energy can be produced is 96121,55 kWh, or 1427 kWh (1,51%) greater comparing with real?generation condition with 96694 kWh.