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All Journal International Journal of Electrical and Computer Engineering Jurnal Nasional Teknik Elektro dan Teknologi Informasi
Stephanus, Harnoko
Gadjah Mada University
Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering

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Optimum Permanent Magnets Configuration in Flat-Quasi Linear Permanent Magnet Generators Fransisco Danang Wijaya; Budi Azhari; Harnoko Stephanus
International Journal of Electrical and Computer Engineering (IJECE) Vol 6, No 6: December 2016
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1277.282 KB) | DOI: 10.11591/ijece.v6i6.pp2589-2602

Abstract

Flat-quasi type of linear permanent magnet generators (LPMGs) have been considered to be applied for several applications, such for wave energy conversion and free piston combustion engine. One of the important issues concerning LPMG is the permanent magnets configuration, due to its effects to the generator’s excitation performance. In this paper, a 1 kW flat-quasi LPMG would be designed and built. During the process, optimum permanent magnets configuration was required and researched. The optimum configuration considered the output power and resulted cogging force. Invetigation was then conducted by modifying several variables, including poles’ arrangement, pole length, number of pole, and pole skewing angle. The modification constraints were total permanent magnets’ volume and generator dimension. The results showed that permanent magnet configuration with halbach arrangement, pole length equals 55% of the slot pitch length, and 61.19o skewing angle produced the optimum output values.
Pengaruh Perubahan Sisi Elektrode Sangkar Delta pada Nilai Resistans Satu Batang Pentanah Harnoko Stephanus
Jurnal Nasional Teknik Elektro dan Teknologi Informasi Vol 6 No 4: November 2017
Publisher : Departemen Teknik Elektro dan Teknologi Informasi, Fakultas Teknik, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (961.609 KB)

Abstract

Grounding rod is more practical than grounding plate or grounding strip. Grounding resistance value must be set as small as possible. But, it is hard to approach the standard grounding resistance value. There are some methods used to reduce grounding resistance like paralleling ground rod, extending ground rod, or enlarging ground rod diameter. This paper explains the effect of side variation of delta cage electrode (dimension of delta length is 1 meter) on single ground rod resistance value. In this research, ground rod’s length and diameter are 1.5 meter and 10 millimeter, respectively. Ground rod is planted on the ground while the but is on land surface. Grounding resistance value of that single ground rod then is being compared with grounding resistance value of the combination of single ground rod and the delta cage electrode (dimension of delta side are 0.5 meter, 1 meter, and 1.5 meter). This research concludes that: (a) Delta cage electrode (its side are 0.5 meter, 1 meter, and 1.5 meter) with three edge rod length 1.5 meter (diameter 10 millimeter) can minimize grounding resistance value of single ground rod (length 1.5 meter, diameter 10 millimeter) by 29 ohm, 33 ohm, and 40 ohm. (b) Delta cage electrode (its side are 0.5 meter, 1 meter, and 1.5 meter) with six edge rod length 1.5 meter (diameter 10 millimeter) can minimize grounding resistance value of single ground rod (length 1.5 meter, diameter 10 millimeter) by 34 ohm, 37 ohm, and 43 ohm.
Pengaruh Panjang Elektrode Sangkar Delta pada Nilai Resistans Pentanahan di Lokasi Sempit Harnoko Stephanus
Jurnal Nasional Teknik Elektro dan Teknologi Informasi Vol 5 No 2: Mei 2016
Publisher : Departemen Teknik Elektro dan Teknologi Informasi, Fakultas Teknik, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (897.324 KB)

Abstract

Grounding rod is more practical than grounding plate or grounding strip. Grounding resistance value must be set as small as possible. But, it is hard to approach the standard grounding resistance value. There are some methods used to reduce grounding resistance like paralleling ground rod, extending ground rod, or enlarging ground rod diameter. This paper explains the effect of length variation of delta cage electrode (dimension of delta side is 1 meter) on single ground rod resistance value. In this paper, ground rod’s length and diameter are 1.5 meters and 10 millimeters respectively. Ground rod is planted on the ground while the but is on land surface. Grounding resistance value of that single ground rod then is being compared with grounding resistance value of the combination of single ground rod and the delta cage electrode (dimension of delta side is 1 meter). After this research, we can conclude that: (a) delta cage electrode (its side 1 m) with three edge rod (length 0.5 meters, 1 meter and 1.5 meters; diameter 10 millimeters) can minimize grounding resistance value of single ground rod (length 1.5 meters, diameter 10 millimeters) by 33 ohm, 45 ohm, dan 50 ohm; (b) delta cage electrode (its side 1 m) with six edge rod (length 0.5 meters, 1 meter, and 1.5 meters; diameter 10 millimeters) can minimize grounding resistance value of single ground rod (length 1.5 meters, diameter 10 millimeters) by 45 ohms, 52 ohms dan 56 ohms.
Pengaruh Elektrode Sangkar Persegi Pada Resistans Pentanahan Satu Batang Di Lokasi Sempit Harnoko Stephanus
Jurnal Nasional Teknik Elektro dan Teknologi Informasi Vol 4 No 1: Februari 2015
Publisher : Departemen Teknik Elektro dan Teknologi Informasi, Fakultas Teknik, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1155.817 KB)

Abstract

Grounding rod is more practical than grounding plate or grounding strip. Grounding resistance value must be set as small as possible, but it is hard to approach the standard grounding resistance value. There are some methods used to reduce grounding resistance such as: paralleling ground rod, extending ground rod, or enlarging ground rod diameter. This paper explains the influence of square cage electrode (1x1 meter) on single ground rod resistance value. In this research, ground rod’s length and diameter were 1.5 meters and 12 millimeters respectively. Ground rod was planted on the ground while the butt was on land surface. Grounding resistance value of that single ground rod was then compared with grounding resistance value of the combination of single ground rod and the square cage electrode (dimension 1x1 meter). The results show that : (a) 1x1 meter square cage electrode with four edge rod (length 0.5 meters; diameter 12 millimeters) can minimize grounding resistance value of single ground rod (length 1.5 meters, diameter 12 millimeters) by 29 ohms. (b) 1x1 meter square cage electrode with eight edge rod (length 0.5 meters; diameter 12 millimeters) can minimize grounding resistance value of single ground rod (length 1.5 meters, diameter 12 millimeters) by 32 ohms.
Co-Authors Budi Azhari Fransisco Danang Wijaya