scholarly journals Inspeksi Overhaul Motor Induksi 3 Fasa 1000 KW di PT. Mesindo Tekninesia

2020 ◽  
Vol 21 (2) ◽  
pp. 100
Author(s):  
Akmal Radiansyah ◽  
Albert Gifson
Keyword(s):  
Electrical Measurement ◽  
Mechanical Action ◽  
Load Test ◽  
Electric Motors ◽  
Mechanical Measurement ◽  
Electrical Measurements ◽  
Maintenance And Repair ◽  
Maintenance Activity ◽  
Polarization Index ◽  
Standard Value

An electric motor that is used continuously will experience a decline in performance and even be damaged, maintenance and repair of electric motors must be done based on standards so that all existing specifications can be met and repairs deserve to be accepted. Where in this case motor repair is done by overhauling, where overhaul is a comprehensive repair or maintenance activity by repairing or replacing parts of electric motors that are damaged. Based on visual data and electrical measurements the decrease in the value of the polarization index (PI) of the induction motor is caused by dirty and moist winding conditions. Overhaul is done in 8 stages, namely; planning, dismantling, electrical measurement, mechanical measurement, electrical action, mechanical action, assembling and no load test running. After overhauling, the result shows that the value of the polarization index (PI) increased by 1.4 from 1.8 to 3.2, which is above the standard value set by IEEE 43.ABSTRAK:Suatu motor listrik yang digunakan terus menerus akan mengalami penurunan performa bahkan rusak, perawatan dan perbaikan motor listrik harus dilakukan berdasarkan standar supaya semua spesifikasi yang ada dapat terpenuhi dan perbaikan layak untuk diterima. Dimana pada kasus ini perbaikan motor diakukan dengan cara overhaul, dimana overhaul merupakan kegiatan perbaikan atau perawatan secara menyeluruh dengan cara memperbaiki atau mengganti bagian dari motor listrik yang mengalami kerusakan. Berdasarkan data visual dan pengukuran elektrik penurunan nilai polarization index (PI) motor induksi disebabkan oleh kondisi winding yang kotor dan lembab. Overhaul dilakukan dengan 8 tahapan, yaitu; planning, dismantling, pengukuran elektrik, pengukuran mekanik, tindakan elektrik, tindakan mekanik, assembling dan running test no load. Setelah overhaul didapatkan hasil bahwa nilai polarization index (PI) meningkat sebesar 1.4 dari sebelumnya 1.8 menjadi 3.2, berada diatas nilai standar yang ditetapkan oleh IEEE 43

Measurement of Valence Band Offset in Strained GexSi1−x/Si Heterojunctions

1991 ◽  
Vol 220 ◽  
Author(s):  
S. Khorram ◽  
C. H. Chern ◽  
K. L. Wang
Keyword(s):  
Valence Band ◽  
Theoretical Calculations ◽  
Thick Layer ◽  
Electrical Measurement ◽  
Band Offset ◽  
Electrical Measurements ◽  
Temperature Growth ◽  
Heterostruc Ture ◽  
Valence Band Discontinuity ◽  
Good Agreement

ABSTRACTThe valence band discontinuity ΔEV in the coherently strained GexSi1−x/Si heterostruc-ture is determined using I-V-T measurement. The electrical measurements of the band discontinuity of the pseudomorphic layers are difficult due to the thin layer imposed by the strain. Recently, low temperature growth of thick layer (>100 nm) of coherently strained GexSi1−x on Si has been achieved and thus made it possible for an accurate electrical measurement of band offset. The results obtained are in good agreement with the theoretical calculations by pseudopotential method.

scholarly journals Pengembangan Bahan Ajar Mata Pelajaran Dasar dan Pengukuran Listrik untuk Sekolah Menengah Kejuruan

2016 ◽  
Vol 23 (1) ◽  
pp. 28 ◽  
Author(s):  
Aliangga Kusumam ◽  
Mukhidin Mukhidin ◽  
Bachtiar Hasan
Keyword(s):  
Research And Development ◽  
Core Competencies ◽  
Sampling Technique ◽  
Electrical Measurement ◽  
Measuring Instruments ◽  
Electrical Measurements ◽  
Teaching Materials ◽  
Purposive Sampling ◽  
System Of Units ◽  
Preliminary Study

This study is aimed to develop teaching materials of basic electrical and electrical measurement, and to find out the feasibility of the teaching materials that have been developed in SMK Negeri 1 Koba Bangka. This study used the method of Research and Development (R & D) that begins with the preliminary study followed by the development phase and the product assessment. The subjects that consisted of three experts and 28 students of the Department of Electrical Installation Engineering were determined using purposive sampling technique. The data collection technique used documentation, interviews and questionnaires. The procedure of this study is the process of preparing the teaching materials through the following stages: (a) A preliminary study, by conducting interviews with the head of the program and the teachers. The analysis of the syllabus and core competencies. (b) Collecting learning resources and literature as well as the main points of the materials. (c) Preparing the draft of the materials. (d) The limited trial of the products (e) The extensive product testing. (f) The data analysis and evaluation. The results were the development of the teaching materials was based on the curriculum of 2013 and the syllabus of basic electrical and electrical measurement. The teaching materials were developed starting from the materials of electric current and electron current, electrical materials, passive elements, active elements, direct current resistive circuits, two poles theorem, power and efforts, switching circuits, the system of units of measurement, measuring instruments and electrical measurements, and the types of measuring devices.Penelitian ini bertujuan untuk mengembangkan bahan ajar dasar dan pengukuran listrik, dan mengetahui kelayakan bahan ajar yang telah dikembangkan menurut expert judgment dan peserta didik di SMKN I Koba Bangka. Metode penelitian ini menggunakan Research and Development (R & D) yang diawali dengan studi pendahuluan dilanjutkan tahap pengembangan dan penilaian produk. Subjek penelitian ditentukan dengan menggunakan teknik purposive sampling yang terdiri dari tiga orang expert judgement dan 28 orang peserta didik teknik instalasi pemanfaatan tenaga listrik. Pengumpulan data dengan teknik studi dokumentasi, wawancara dan kuesioner berupa angket. Prosedur penelitian ini adalah proses penyusunan bahan ajar dasar dan pengukuran listrik melalui tahap-tahap sebagai berikut: (a) Studi pendahuluan, dengan melakukan wawancara terhadap ketua program dan guru. Studi analisis silabus dan menganalisa kompetensi dasar dalam penyusunan bahan ajar (b) Mengumpulkan sumber belajar dan literatur serta pokok-pokok materi yang akan disusun. (c) Penyusunan draft bahan ajar dasar dan pengukuran listrik. (d) Uji coba terbatas produk. (e) Uji coba lebih luas produk. (f) Pengolahan data dan evaluasi. Kesimpulan penelitian ini adalah pengembangan bahan ajar mata pelajaran dasar dan pengukuran listrik yaitu bahan dikembangkan dari kurikulum 2013 dan silabus mata pelajaran dasar dan pengukuran listrik. Materi bahan ajar dikembangkan mulai dari materi arus listrik dan arus elektron, bahanbahan listrik, elemen pasif, elemen aktif, rangkaian resistif arus searah, teorema dua kutub, daya dan usaha, peralihan rangkaian, sistem satuan pengukuran, alat ukur dan pengukuran listrik, dan jenis alat ukur.

A Study of Measurement Methods for Detecting Voiding and Delamination of Die Attach Materials in Power Semiconductor Devices

1996 ◽  
Author(s):  
L. Smith ◽  
T.S. Kalkur
Keyword(s):  
Semiconductor Industry ◽  
Semiconductor Devices ◽  
Electrical Measurement ◽  
Acoustic Microscopy ◽  
Temperature Sensitive ◽  
Analysis Tool ◽  
Electrical Measurements ◽  
X Ray ◽  
Power Semiconductor ◽  
Die Attach

Abstract There are three basic methods used to detect voiding and delamination of die attach materials in semiconductor devices. (1)Electrical measurement of a temperature sensitive parameter (e.g. Vbe, Vgs) under pulsed power conditions is preferred by manufacturers because the data is easily and quickly obtainable during final electrical test; but electrical measurements are only sensitive to gross voiding or delamination. (2)X-ray analysis produces images which are generally accepted as proof of voiding; but X-ray is completely insensitive to delamination or degradation from thermal stress. (3)Use of Scanning Acoustic Microscopy (SAM) as a non-intrusive analysis tool is increasing in the semiconductor industry and provides accurate evidence of delamination in cases where the other two methods fail. The use of all three methods is recommended to maintain a reliable power product fabrication line at its peak of quality with respect to die attach coverage. This paper will compare and contrast the three methods during thermal shock stress in two manufacturer's power Insulated Gate Bipolar Transistor (IGBT) using a lead-tin solder die attach material.

Vergleich optischer und elektrischer Messungen an Cu-, Ag- und Au-Schichten mit unterschiedlicher Fehlstellenkonzentration / Comparison of Optical and Electrical Measurement on Cu, Ag and Au Films with Different Lattice Defect Concentrations

1974 ◽  
Vol 29 (8) ◽  
pp. 1159-1163
Author(s):  
H. Bispinck
Keyword(s):  
Hall Effect ◽  
Electron Density ◽  
Optical Constants ◽  
Lattice Defect ◽  
Electrical Measurement ◽  
Electrical Measurements ◽  
Conduction Electrons

The optical constants, d. c. conductivity and Hall-effect were measured in UHV for evaporated films of Cu, Ag and Au (thickness approx. 100 nm) which were quenched, condensed and stepwise annealed. For the range of wevelengths chosen (0.9 - 2.4 μm), a density of conduction electrons and their damping frequency can be determined from the optical constants by using the Drude theory. If one compares these data with the corresponding electrical measurements, a very similar behavior is shown for the recovery. The electron density increases by a factor 1.3 - 1.6, whereas the damping frequency decreases by a factor 1.7 - 2.8.

63Ni β range and backscattering in confined geometries

1987 ◽  
Vol 65 (5) ◽  
pp. 1012-1024 ◽  
Author(s):  
K. W. Michael Siu ◽  
Walter A. Aue
Keyword(s):  
Gas Phase ◽  
Charge Distribution ◽  
Electron Capture ◽  
Counter Electrode ◽  
Ion Pairs ◽  
Electrical Measurement ◽  
Electron Capture Detector ◽  
Range Data ◽  
Ambient Conditions ◽  
Electrical Measurements

To know the spatial distribution of ion pairs resulting from 63Ni β radiation in the gas phase is important for a variety of theoretical and practical reasons, in particular those concerning the electron capture detector. Literature estimates of this distribution vary by about one order of magnitude, yet this parameter is necessary for the modelling of this detector. The 63Ni-induced, initial ion pair distribution was therefore measured in a variety of gases with two techniques: a conventional one based on the electrical saturation current at variable interelectrode distances, and an unconventional one based on luminescence from a plastic scintillator. The data are analyzed in terms of two ranges, d50 and d95, that describe the distances from a planar radioactive foil within which 50% and 95% of the total gas-phase ionization occur. The data from the electrical measurement show unexpected evidence of strong β backscattering and secondary electron emission from the counter-electrode. Under these (non-exponential) conditions, d50 values in the common detector gases nitrogen and argon/methane vary from 0.5 to 1.0 mm, depending on the nature of the counter-electrode. Calculations based on the quasi-exponential range found at longer distances in electrical measurements yield values of about 2.5 mm (which are low because of geometric measurement bias). In contrast, the data from the luminescence measurement are almost completely exponential and d50 values for argon (+5% methane) and nitrogen are 2.8 and 3.8 mm, respectively. The d95 values vary from 12 to 16 mm for the luminescence, to 6 and 9 mm for the (less reliable) electrical measurement; all at ambient conditions. The luminescence data are considered closer to the "true" (unimpeded) charge distribution, while the ionization data may be closer to the initial charge topography inside an electron capture detector of confining geometry. All range data, however, are short enough to advise modelling the detector as a system with strongly heterogeneous charge distribution. No evidence was found for some of the very large range estimates found in the literature.

scholarly journals II. On the construction of some mercury standards of resistance, with a determination of the temperature coefficient of resistance of mercury

1905 ◽  
Vol 204 (372-386) ◽  
pp. 57-120 ◽  
Keyword(s):  
Electrical Measurement ◽  
National Physical Laboratory ◽  
Probable Error ◽  
Electrical Measurements ◽  
Temperature Coefficient Of Resistance ◽  
Cross Sectional ◽  
Object A ◽  
Physical Laboratory ◽  
Long Time

According to the Order in Council of August 23, 1894, by which certain fundamental electrical units were made legal— “The ohm which has the value 10 9 in terms of the centimetre, and the second of time, and is represented by the resistance offered to an unvarying electric current by a column of mercury at the temperature of melting ice, 14.4521 grammes in mass, of a constant cross-sectional area, and of a length 106.3 centims.,” is one of the units of electrical measurement on which “denomination of standards required for use in trade” is to be based. The establishment of the National Physical Laboratory rendered it possible to realize this unit in England. With this object, a number of selected tubes of “Verre dur” were obtained from M. Baudin, with the kind assistance of the officials of the Bureau International, while others of Jena 16'" glass were procured from Messrs. Schott and Co., Jena. The work, however, has necessarily occupied a long time. With the increasing accuracy of electrical measurements it appeared desirable to determine the constants of the tubes so that the probable error should not exceed 1 part in 100,000. Preliminary observations of various kinds were essential to secure success, while the work of organising the various departments of the Laboratory also tended to delay matters; hence it was not until the autumn of 1902 that the real start was made.

scholarly journals Rapid Evaluation of Surface Sanitation by Electrical Measurement

2005 ◽  
Vol 88 (4) ◽  
pp. 1223-1226
Author(s):  
Fernando Álvarez ◽  
Susana Sanz ◽  
José Juan Rodríguez-Jerez
Keyword(s):  
Food Industry ◽  
Electrical Measurement ◽  
Rapid Evaluation ◽  
Excellent Correlation ◽  
Electrical Measurements ◽  
Subsequent Removal ◽  
Traditional Methods ◽  
Electrical Method ◽  
Routine Monitoring

Abstract Electrical measurements are easier and faster than traditional methods for evaluating surface sanitation in the food industry. However, the behavior of sublethally damaged bacteria is different in each method. The electrical method is more sensitive to the presence of disinfectant traces in the samples. These issues lead to low correlations between both methods (r2 < 0.7). The use of smaller sample volumes in electrical measurements, together with the addition of a blend of neutralizers to the sample and the subsequent removal by filtration, provide r2 values >0.9. The developed protocol shows an excellent correlation with traditional methods and facilitates the adaptation of the electrical method to routine monitoring of surface sanitation. It allows for a reduction in holding times and thereby provides the necessary time to make decisions.

scholarly journals STUDYING ELECTRICAL MEASUREMENT METHODS ON LABORATORY BENCH

2020 ◽  
Vol 2020 (1) ◽  
pp. 121-122
Author(s):  
Irina Il'ina ◽  
Stepan Sadovskiy
Keyword(s):  
Electrical Measurement ◽  
Measurement Methods ◽  
Laboratory Work ◽  
Electrical Measurements ◽  
Laboratory Bench

Studying laboratory bench and developing laboratory work on electrical measurements and basics of metrology.

Electrical Measurements Student Laboratory — Replacing Hands-on with Remote and Virtual Experiments

2008 ◽  
Vol 45 (4) ◽  
pp. 299-309 ◽  
Author(s):  
Roman Malarić ◽  
Marko Jurčević ◽  
Hrvoje Hegeduš ◽  
Drago Cmuk ◽  
Petar Mostarac
Keyword(s):  
High Precision ◽  
Electrical Measurement ◽  
Experimental Setup ◽  
Measurement Laboratory ◽  
Electrical Measurements ◽  
Web Based ◽  
Virtual Experiments ◽  
Large Numbers ◽  
Hands On ◽  
Student Laboratory

This paper discusses the problem of transferring knowledge to students of an undergraduate electrical measurement course, and also describes the design of a Web-based measurement laboratory and experimental setup of Web-based experiments at the Faculty of Electrical Engineering and Computing (FER) in Zagreb, Croatia. The suggested design offers the possibility of teaching or presenting high-precision experiments using expensive or sensitive equipment that is unavailable in sufficient quantities to serve large numbers of students.

Transport Properties of Hexagonal YMn0.9Ru0.1O3 Compound

2014 ◽  
Vol 1047 ◽  
pp. 151-154
Author(s):  
Rajesh K. Thakur ◽  
Rasna Thakur ◽  
N. Kaurav ◽  
Anchit Modi ◽  
G.S. Okram ◽  
...  
Keyword(s):  
Room Temperature ◽  
Sintering Temperature ◽  
Solid State Reaction Method ◽  
Electrical Measurement ◽  
Hexagonal Crystal Structure ◽  
Hexagonal Crystal ◽  
Electrical Measurements ◽  
Conventional Solid State Reaction ◽  
Consistent Increase ◽  
Diffraction Peaks

We report that the polycrystalline hexagonal YMn0.9Ru0.1O3 compound can be synthesized by using conventional solid state reaction method at a sintering temperature of 128000. The reflections/diffraction peaks observed in the XRD measurements matched exactly with standard (JCPDS) data for the hexagonal crystal structure of YMnO3 without any extra peaks due to impurities. The dc electrical measurements of the as prepared YMn0.9Ru0.1O3 compound have been carried out below room temperature down to the minimum possible. The electrical measurement of the Ru doped YMnO3 compounds reveal that the resistivity is suppressed with the addition of the ruthenium content and a consistent increase in the resistivity have been witnessed with decreasing temperature. In generalized sense the observed resistivity versus temperature behavior in the studied compounds suggests the induction semiconductor-like character in the material.KeywordsXRD, Electrical resistivity, Manganites

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