Hutan Pinus Limpakuwuswhich is located on the southern slope of Mount Slamet is located at an altitude of about 750 meters above sea level (MDPL). The Limpakuwus Pine Forest has limited access to electricity from the PLN network, so there are still many locations at night or cloudy skies, so these locations have limited access, this causes the manager to use generators to turn on the lights in order to provide the electricity needed for electricity. provide information on the location in the Limakuwus Pine Forest tourist spot. The interview and survey method started this service activity, the interview aimed to determine the need for the number of spots (spots), to get lighting and a survey to determine the location of the lamp installation. equipment, and manufacture of solar powered PJU light poles and their installation. The results of these activities include increasing knowledge, skills of residents in the field of fabrication and installation of solar-powered PJU lamps with the installation of 2100Lm 20 Watt LED lights, 5V/40Watt Solar Panels and 3.2V/32 Ah batteries at predetermined locations, as well as increased ease of use. running activities at night at that location. Abstrak Hutan Pinus Limpakuwus yang berada di lereng selatan Gunung Slamet itu berada pada ketinggian sekitar 750 meter di atas permukaan laut (MDPL). Hutan Pinus Limpakuwus memiliki akses listrik terbatas dari jaringan PLN, sehingga masih banyaknya lokasi yang malam hari atau kondisi langit mendung, maka lokasi tersebut memiliki akses yang terbatas hal ini menyebabkan pihak pengelola menggunakan genset guna menghidupkan lampu dalam rangka menyediakan sarana kebutuhan listrik yang digunakan untuk memberikan penerangan pada lokasi di tempat wisata Hutan Pinus Limakuwus tersebut. Metode wawancara dan survey mengawali kegiatan pengabdian ini, wawancara bertujuan untuk menentukan kebutuhan jumlah titik (spot), untuk mendapat penerangan dan survey guna menentukan lokasi pemasangan lampu Metode pelaksanaan kegiatan meliputi: survey lokasi, identifikasi dan solusi masalah, perencanaan kegiatan, perhitungan kebutuhan bahan dan peralatan, dan pembuatan tiang lampu PJU bertenaga surya dan pemasangannya. Hasil kegiatan antara lain peningkatan pengetahuan, ketrampilan warga di bidang fabrikasi dan instalasi lampu PJU bertenaga surya dengan terpasangnya lampu LED 2100Lm 20 Watt, Solar Panel 5V/40Watt dan battery 3.2V/32 Ah pada lokasi yang telah di tentukan sebelumnya, serta peningkatan kemudahan dalam menjalankan aktivitas dimalam hari pada lokasi tersebut.

This study designs a 1-phase permanent magnet generator with double-sided axial coreless 10 stator poles to get optimum output voltage and power. Permanent magnet generator is chosen because it does not require a DC excitation current and the maintenance is relatively easy, so it has potential to be applied on a low head pico hydro power plant. The design uses NdFeb (Neodymium-Iron-Boron) type permanent magnet. The study was conducted by simulation to get the flux density in the stator coil using FEMM 4.2 applications. Simulation is done with the air gap width varies from 2 mm, 3 mm, 4 mm, and 5 mm. The depth of the magnet in the yoke varies from 0%, 5%, 10%, and 50% of the magnet thickness. Then, the flux density is used to estimate the output voltage and power of the generator. The results show that minimum output of 52.85 V and 195,56 VA is obtained at air gap distance of 5 mm and the depth of the magnet in yoke is 50%. Maximum output of 87,25 V and 322.84 VA is obtained at air gap distance of 2 mm and the depth of the magnet in yoke is 0% of the magnet thickness.

<span>Desa Kejawar memiliki sumberdaya air yang dapat dimanfaatkan sebagai pembangkit listrik tenaga mikro <span>hidro (PLTMH). Ketersediaan mercu bendung saluran pembawa, dan bak pengendap menjadi faktor utama diadakannya <span>penelitian ini. Metode yang digunakan dalam pengumpulan data primer berupa <span><em>head </em><span>yaitu dengan pengukuran langsung <span>di lokasi perencanaan pembangunan PLTMH dan didapatkan hasil pengukuran <span><em>head </em><span>efektif setinggi 3,08m. <span>Pengumpulan data sekunder berupa curah hujan, iklim, dan DAS sebagai perhitungan untuk debit andalan diperoleh <span>hasil 0,05 𝑚<span>3<span>/𝑠. Kapasitas daya dalam perencanaan pembangunan PLTMH ini sebesar 1,36 kW. Berdasarkan simulasi <span>menggunakan aplikasi TURBNPRO 3.0 turbin yang digunakan bertipe kincir dan alternator 3 kW. Total investasi yang <span>dibutuhkan dalam perencanaan pembangunan PLTMH sebesar Rp. 31.699.531 dengan umur proyek selama 10 tahun. <span>Kelayakan proyek perencanaan pembangunan PLTMH diperoleh nilai NPV pada <span><em>discount factor </em><span>10% sebesar Rp. <span>37.063.244&gt;0, BCR sebesar 2,1&gt;1, PP selama 3,46 tahun &lt; 10 tahun, IRR pada <span><em>discount factor </em><span>34% sebesar 33,6%. <span>Berdasar pada evaluasi proyek, dapat dikatakan perencanaan pembangunan PLTMH di aliran sungai Desa Kejawar <span>layak dilakukan</span></span></span></span></span></span></span></span></span></span></span><br /></span></span></span></span></span></span></span></span></span></span></span>

This study discussed the coordination of working time of Over Current Relay (OCR) incoming and OCR feeders on a substation with a 60 MVA transformer, 150/20 kV which supplies 4 feeders. OCR working time coordination was done to compare the performance of OCR using 3 time characteristics : standard inverse (SI), very inverse (VI) and extremely inverse (EI). OCR feeder 1 (OCR F1) was chosen to coordinate work time with OCR incoming because feeder 1 (F1) is the longest (6.10 km) between the 4 feeders so that it has the largest impedance. Phase to phase short-circuit current was calculated at a distance of 0% (bus 20 kV), 1%, 25%, 50%, 75% and 100% length of feeder 1. The short-circuit current was used to calculate the time multiplier setting (tms) also working time (tOCR) OCR incoming and OCR feeder 1 with time characteristics SI, VI and EI. From the comparison analysis of OCR incoming and OCR feeder working time coordination, it was proven that the time characteristics of SI had the best performance by considering OCR feeder working speed and OCR incoming work speed as back up.

This study aims to observe the influence of the changing stator dimension on the air gap magnetic flux density (Bg) in the design of a single-phase radial flux permanent magnet generator (RFPMG). The changes in stator dimension were carried out by using three different wire diameters as stator wire, namely, AWG 14 (d = 1.63 mm), AWG 15 (d = 1.45 mm) and AWG 16 (d = 1.29 mm). The dimension of the width of the stator teeth (Wts) was fixed such that a larger stator wire diameter will require a larger stator outside diameter (Dso). By fixing the dimensions of the rotor, permanent magnet, air gap (lg) and stator inner diameter, the magnitude of the magnetic flux density in the air gap (Bg) can be determined. This flux density was used to calculate the phase back electromotive force (Eph). The terminal phase voltage (V∅) was determined after calculating the stator wire impedance (Z) with a constant current of 3.63 A. The study method was conducted by determining the design parameters, calculating the design variables, designing the generator dimensions using AutoCad and determining the magnetic flux density using FEMM simulation.  The results show that the magnetic flux density in the air gap and the phase back emf Eph slightly decrease with increasing stator dimension because of increasing reluctance. However, the voltage drop is more dominant when the stator coil wire diameter is smaller. Thus, a larger diameter of the stator wire would allow terminal phase voltage (V∅) to become slightly larger. With a stator wire diameter of 1.29, 1.45 and 1.63 mm, the impedance values of the stator wire (Z) were 9.52746, 9.23581 and 9.06421 Ω and the terminal phase voltages (V∅) were 220.73, 221.57 and 222.80 V, respectively. Increasing the power capacity (S) in the RFPMG design by increasing the diameter (d) of the stator wire will cause a significant increase in the percentage of the stator maximum current carrying capacity wire but the decrease in stator wire impedance is not significant. Thus, it will reduce the phase terminal voltage (V∅) from its nominal value.