Relevant bibliographies by topics / Electrical transformers

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Electrical transformers'

Author: Grafiati
Published: 4 June 2021
Last updated: 13 February 2022

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Journal articles on the topic "Electrical transformers"

1

Kefalas, Themistoklis D., and Antonios Kladas. "Reduction of Power Grid Losses by Using Energy Efficient Distribution Transformers." Materials Science Forum 721 (June 2012): 269–74. http://dx.doi.org/10.4028/www.scientific.net/msf.721.269.

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The importance of distribution transformer no-load loss on the operation of modern electrical grids is often underestimated. Internationally, distribution transformer no-load loss constitutes nearly 25% of the transmission and distribution losses of electrical grids. The losses in European Union distribution transformers are estimated at about 33 TWh/year whereas, reactive power and harmonic losses add a further 5 TWh/year. In the Greek electrical grid the no-load losses of 140,000 distribution transformers are estimated at about 490 GWh/year. This paper has two goals the first one is to illustrate the significance of distribution transformer no-load loss in periods of high electric energy cost and the second goal is the presentation of a novel numerical methodology for wound core transformers no-load loss analysis, enabling to determine the economically and technically optimum transformer for every use.
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Banchuin, Rawid, and Roungsan Chaisricharoen. "Vector SDE Based Stochastic Analysis of Transformer." ECTI Transactions on Computer and Information Technology (ECTI-CIT) 15, no. 1 (January 5, 2021): 82–107. http://dx.doi.org/10.37936/ecti-cit.2021151.188931.

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In this research, the stochastic behaviours oftransformer have been analysed by using the stochasticdifferential equation approach where both noise in thevoltage source applied to the transformer and the randomvariations in elements and parameters of transformers havebeen considered. The resulting vector stochasticdifferential equations of the transformer have been bothanalytically and numerically solved in the Ito sense wherethe Euler-Maruyama scheme has been adopted fordetermining the numerical solutions which have been theirsample means have been used for verification. With theobtained analytical and numerical solutions, the stochasticproperties of the transformer’s electrical quantities havebeen studied and the influences of noise in the voltagesource and random variations in elements and parametersof transformers to those electrical quantities have beenanalysed. The causes of high and low frequency stochasticvariations of such electrical quantities in both transient andsteady state have been pointed out. Moreover, furtherextension of our stochastic differential equations and therelated mathematical formulations has also been given.
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Alyunov, A. N., O. S. Vyatkina, I. G. Akhmetova, R. D. Pentiuc, and K. E. Sakipov. "Issues on optimization of operating modes of power transformers." E3S Web of Conferences 124 (2019): 02015. http://dx.doi.org/10.1051/e3sconf/201912402015.

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The article presents measure to optimize the operating modes of power transformers in order to minimize losses of electrical energy. The influence of actual voltage and service life of power transformers on electric power losses is shown. It was proposed to determine the economic capacity of power transformers taking into account the indicated factors, as well as taking into account the time of transformer switching on into the electric network and the form of the load schedule.
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Hanus, Oleksii, and Kostiantyn Starkov. "STUDY OF THE NATURE OF OVERVOLTAGES IN THE ELECTRICAL NETWORK ARISING FROM VOLTAGE TRANSFORMERS." Bulletin of the National Technical University "KhPI". Series: Energy: Reliability and Energy Efficiency, no. 1 (2) (July 2, 2021): 28–36. http://dx.doi.org/10.20998/2224-0349.2021.01.05.

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A non-linear dynamic mathematical model of voltage transformer has been considered and overvoltages arising on the elements of voltage transformer equivalent circuit during transient processes have been investigated. The influence of voltage transformer secondary circuit capacitance on overvoltage multiplicity in the primary circuits and the duration of transients has been determined. The advantages of approximation of nonlinearity of voltage transformers by hyperbolic sine are used. Mathematical expressions determining the nature of changes in the forced and free components of the transient process in an electrical network with a voltage transformer have been obtained. It is shown that with the increase of the electric network capacitance the duration of the transition process damping increases and the frequency of the forced oscillations and the level of overvoltage decrease. It is proved that even small, in comparison with the primary nominal sinusoidal voltage, aperiodic components of the voltage transient process can lead to significant overvoltages during voltage transformer outages. It has been substantiated that both the secondary resistance and the switching torque influence the overvoltage multiplicity arising in the primary winding of voltage transformers. It is shown that the closed secondary winding worsens the disconnection process of non-linear inductance of voltage transformers. The values to which overvoltages increase in this case are determined. According to the results of calculations it is determined that with open secondary winding of voltage transformers the duration of transient process significantly increases. It has been found that the decrease of frequency of forced oscillations, which occurs in this case, is accompanied by an increase of currents in the primary winding of the voltage transformer, which is dangerous in terms of thermal stability of the winding insulation. It is shown, that closing the secondary winding of voltage transformers leads to significant reduction of transient damping time. It is suggested that this algorithm can be used to provide a rapid breakdown (suppression) of ferroresonant processes. The effectiveness of such a measure of stopping of ferroresonance processes as short-term shunting of secondary winding of voltage transformers has been investigated. The correlation of parameters of electric networks (capacity of busbar sections, nonlinearity of characteristics of voltage transformers, disconnection torque, etc.) at which ferroresonance process may occur and consideration of which may allow, in terms of prevention of ferroresonance processes, to identify substations (electric networks) that require more detailed research has been determined. The results of analytical studies were tested in the electric networks of JSC "Kharkivoblenergo" and used in the electricity distribution system for the selection of specific voltage transformers for certain configurations of electrical networks.
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Changjiang, Zheng, Wang Qian, Wang Huai, Shen Zhan, and Claus Leth Bak. "Electrical Stress on the Medium Voltage Medium Frequency Transformer." Energies 14, no. 16 (August 19, 2021): 5136. http://dx.doi.org/10.3390/en14165136.

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This paper proposes an equivalent circuit model to obtain the transient electrical stress quantitatively in medium voltage medium frequency transformers in modern power electronics. To verify this model, transient simulation is performed on a 1.5 kV/1 kHz transformer, revealing voltage overshoot quantitatively between turns and layers of the transformer’s HV winding. Effects of rise time of the input pulse voltage, stray capacitance of the winding insulation, and their interactions on the voltage overshot magnitude are presented. With these results, we propose limiting the voltage overshoot and, thereafter, enhancing medium voltage medium frequency transformer’s insulation capability, which throws light on the transformer’s insulation design. Additionally, guidance on the future studies on aging and endurance lifetime of the medium voltage medium frequency transformer’s insulation could be given.
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Anh Khoi Pham, Dinh. "Application of Frequency Response Analysis for in-service power transformers." Science and Technology Development Journal 20, K1 (March 31, 2017): 58–66. http://dx.doi.org/10.32508/stdj.v20ik1.415.

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CIGRE, IEC and IEEE have recently approved the technique of Frequency Response Analysis (FRA) as an application tool for diagnosis of mechanical failures in power transformer’s active part, i.e., windings, leads and the core. The diagnosis is based on the discrepancy between frequency responses measured on power transformers mainly at different time points. In Vietnam, utilities such as Power Transmission Companies and Power Corporations are investigating this technique for application on their power transformers. Mechanical failures in power transformers cause changes on measured frequency responses starting from a medium frequency range, from several hundreds of Hz or tens of kHz depending on transformer/winding type and power. For a reliable diagnosis, the understanding of transformer/winding structure on measured frequency responses is of importance; thus, the international standards suggested the simulation approach with physical distributed transformer circuits should be exploited. The development of physical distributed circuits of power transformers normally needs availability of internal transformer structure and material properties for an analytical approach. However, for in-service power transformers, this task is challenging since the required data are not available. For a feasible application of the simulation based FRA interpretation, this paper introduces an investigation on the development of a distributed equivalent circuit of an in-service 6.5 MVA 47/27.2 kV Yd5 power transformer. The result of this investigation is a feasible approach in determining electrical parameters in a physical distributed circuit, which supports analysis of frequency responses measured at transformer terminals for real application on in-service power transformers of utilities.
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Liu, Guo Bin, Ning Wang, Qing Hao Wang, Tian Shu Hai, Chuan Zong Zhao, Gui Bin Hu, Hong Zhi Jiao, Chuan Bing Bi, and Hui Yan Cao. "Chromatographic Analysis of Oil-Based Electrical Equipment Discharge Failure." Applied Mechanics and Materials 602-605 (August 2014): 2953–57. http://dx.doi.org/10.4028/www.scientific.net/amm.602-605.2953.

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Discharge of failure was the fault type are likely to occur in transformers, bushings, transformers, and the extent of damage to the equipment is a serious and direct impact on the stable operation of the system, first introduced the principle and gas chromatographic analysis its test methods, then gas chromatography equipment discharge failure is how to judge the conduct described. Through the analysis of transformer oil chromatographic method can be found as early as possible transformers and other equipment inside the existence of latent failures, thus chromatography is to oversee and guarantee the safe operation of an important means of transformer.
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Bogicevic, Zorica, Slobodan Bjelić, Petar Spalević, and Milan Mišić. "Graph-Analytical Method of Determining Impedance in Electrical Transformers." Mathematical Problems in Engineering 2015 (2015): 1–11. http://dx.doi.org/10.1155/2015/745629.

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This paper presents a graph-analytical method for determining the electrical impedance of alternate energy sources, especially small power transformers and current transformers in electric networks. Unlike conventional short-circuit and idle tests, according to proposed method, in this paper, transformer parameters are determined in a new way, which is based on measurement of voltages and currents on the active and reactive load (inductive or capacitive). The effectiveness of the proposed model was verified using an adapted simulation in the software package MATLAB Simulink. The simulation was performed for three types of ABB transformers with a 100% load. Simulation results were obtained for power transformers:Sn1=1 [MVA],Sn2=2 [MVA],Sn3=3.15 [MVA]. If we compare measurement result values ofRT,XT, which are contained in a brochure for ABB transformers and those obtained through simulation, different tolerances are obtained. For reactance results, deviations are up to 20% for all three tested transformers. For results of active resistance tolerances are up to 5% for all three tested transformers. This method can be used not only to determine the active and inductive AC power source parameters but also to determine and analyze the impendence of electrical sources with high frequencies.
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Orosz, Tamás, and István Vajda. "Design Optimization with Geometric Programming for Core Type Large Power Transformers." Electrical, Control and Communication Engineering 6, no. 1 (October 23, 2014): 13–18. http://dx.doi.org/10.2478/ecce-2014-0012.

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Abstract A good transformer design satisfies certain functions and requirements. We can satisfy these requirements by various designs. The aim of the manufacturers is to find the most economic choice within the limitations imposed by the constraint functions, which are the combination of the design parameters resulting in the lowest cost unit. One of the earliest application of the Geometric Programming [GP] is the optimization of power transformers. The GP formalism has two main advantages. First the formalism guarantees that the obtained solution is the global minimum. Second the new solution methods can solve even large-scale GPs extremely efficiently and reliably. The design optimization program seeks a minimum capitalized cost solution by optimally setting the transformer's geometrical and electrical parameters. The transformer's capitalized cost chosen for object function, because it takes into consideration the manufacturing and the operational costs. This paper considers the optimization for three winding, three phase, core-form power transformers. This paper presents the implemented transformer cost optimization model and the optimization results.
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Gong, Chen Bin, Qing Hao Wang, Gang Chen, En Lu Wang, Tian Shu Hai, Xin Yu Li, Bo Li, Xue Wang, Chen Yang Liu, and Qi Dong Zhao. "Research on Harm of Harmonics on Electrical Equipment." Advanced Materials Research 986-987 (July 2014): 1846–49. http://dx.doi.org/10.4028/www.scientific.net/amr.986-987.1846.

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Through the analysis of harmonics caused by transformer, capacitor, electromagnetic voltage transformer and other accident, harmonics is an important indicator of power quality, which has been included in the “pollution" of power grid is found. In order to understand the harmonic, this paper from the concept of quality of electric energy, and then gradually extended to the field of harmonics. This paper firstly introduces the various reasons and equipment may produce harmonic, Secondly, illustrate harm of harmonic to operation of transformers, capacitors, electromagnetic voltage transformers and other electrical equipment, let more people know and understand the relevant knowledge of the harmonic, In order to save technical force and provide scientific basis for future effective harmonic.
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Dissertations / Theses on the topic "Electrical transformers"

1

Siebrits, F. B. (Francois Bart). "Field implementation of a transient voltage measurement facility using HV current transformers." Thesis, Stellenbosch : Stellenbosch University, 2003. http://hdl.handle.net/10019.1/53426.

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Thesis (MScEng)--University of Stellenbosch, 2003.
ENGLISH ABSTRACT: The bandwidth of standard HV measurement devices such as capacitive voltage transformers is too limited in order to measure wideband phenomena. This thesis is concerned with the investigation into a non- intrusive HV transient voltage measurement facility using standard substation HV current transformers (CI's) configured in a transconductance topology. The sensing, summation and integration of the CT capacitive earth currents are investigated. This thesis also reports on the development of a optically isolated link using optical fibre for signal transfer and a computer based data acquisition system.
AFRIKAANSE OPSOMMING: Standaard hoogspannings (HS) meettoerusting soos kapasitiewe spannmgs transformators het beperkte bandwydte vir die meet van wyeband verskynsels. Hierdie tesis handel oor die implementering van 'n HS meetstelsel wat op meinbrekende wyse oorgangsverskynsels meet deur middel van HS stroomtransformators wat in 'n transkonduktansie topologie gekonfigureer is. Die meet, sommasie en integrasie van kapasitoewe grondstrome word ondersoek. Hierdie tesis doen ook verslag aangaande die ontwikkeling van 'n optiese geisoleerde koppelvlak wat gebruik word vir seinoordrag en 'n rekenaar gebasseerde data versamelaar.
pdv201406
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Barham, Oliver M. "Microfabricated Bulk Piezoelectric Transformers." Thesis, University of Maryland, College Park, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10615552.

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Piezoelectric voltage transformers (PTs) can be used to transform an input voltage into a different, required output voltage needed in electronic and electro- mechanical systems, among other varied uses. On the macro scale, they have been commercialized in electronics powering consumer laptop liquid crystal displays, and compete with an older, more prevalent technology, inductive electromagnetic volt- age transformers (EMTs). The present work investigates PTs on smaller size scales that are currently in the academic research sphere, with an eye towards applications including micro-robotics and other small-scale electronic and electromechanical sys- tems. PTs and EMTs are compared on the basis of power and energy density, with PTs trending towards higher values of power and energy density, comparatively, indicating their suitability for small-scale systems. Among PT topologies, bulk disc-type PTs, operating in their fundamental radial extension mode, and free-free beam PTs, operating in their fundamental length extensional mode, are good can- didates for microfabrication and are considered here. Analytical modeling based on the Extended Hamilton Method is used to predict device performance and integrate mechanical tethering as a boundary condition. This model differs from previous PT models in that the electric enthalpy is used to derive constituent equations of motion with Hamilton’s Method, and therefore this approach is also more generally applica- ble to other piezoelectric systems outside of the present work. Prototype devices are microfabricated using a two mask process consisting of traditional photolithography combined with micropowder blasting, and are tested with various output electri- cal loads. 4mm diameter tethered disc PTs on the order of .002cm

3 , two orders smaller than the bulk PT literature, had the followingperformance: a prototype with electrode area ratio (input area / output area) = 1 had peak gain of 2.3 (± 0.1), efficiency of 33 (± 0.1)% and output power density of 51.3 (± 4.0)W cm

-3 (for output power of80 (± 6)mW) at 1M? load, for an input voltage range of 3V-6V (± one standard deviation). The gain results are similar to those of several much larger bulk devices in the literature, but the efficiencies of the present devices are lower. Rectangular topology, free-free beam devices were also microfabricated across 3 or- ders of scale by volume, with the smallest device on the order of .00002cm

3 . These devices exhibited higher quality factorsand efficiencies, in some cases, compared to circular devices, but lower peak gain (by roughly 1/2 ). Limitations of the microfab- rication process are determined, and future work is proposed. Overall, the devices fabricated in the present work show promise for integration into small-scale engi- neered systems, but improvements can be made in efficiency, and potentially voltage gain, depending on the application

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Lavalle, Juan Carlos. "Failure detection in transformers using vibrational analysis." Thesis, Massachusetts Institute of Technology, 1986. http://hdl.handle.net/1721.1/106705.

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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1986.
MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING
Bibliography: leaves 191-194.
by Juan Carlos Lavalle.
M.S.
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Carvajal, Angel J. "First principles design of coreless power transformers." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/120875.

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Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2018.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 117-118).
This thesis presents a theoretical foundation and methodology for designing novel 4-coil high frequency coreless power transformers from first principles via lumped equivalent circuit models. The procedure is applied to construct a design for 100W transformer with an S21 parameter value of .96. Using MATLAB and LTspice, simulation tools have been developed to produce accurate predictions of inductance, resistance, coupling coefficients, and S21 parameter values for an ensemble of coil models. These theoretical calculations have been employed for spiral and cylindrical coils and have been validated with numerous constructed experimental designs. The utility uses a first principles approach and derives these calculations directly from the physical parameters and relative positions of the coils. Simulation outputs greatly aid the engineering task of designing an efficient coreless power transformer.
by Angel J. Carvajal.
M. Eng.
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Amuanyena, L. A. T. "Effects of geomagnetically induced currents on power transformers and reactors." Master's thesis, University of Cape Town, 2003. http://hdl.handle.net/11427/5235.

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Chuthi, Noel Nelson Stima. "Current transformers transient response modelling using electromagnetic transient program (EMTP)." Master's thesis, University of Cape Town, 1997. http://hdl.handle.net/11427/19564.

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The subject of this thesis is Current Transformer Transient response study using an electromagnetic Transient program (EMTP). Current transformers are considered eyes for power system protection. Behaviours of protection systems depend largely on information fed to them by instrument transformers. Ferromagnetic current transformers have for many years provided practical method of current measurement, however there are limitations associated with current transformer operation:- notably, difficult in maintaining accuracy over the full range of operating conditions, and most particularly current transformers tendency to suffer saturation of iron core during severe faults, with accompanying severe ratio or loss of output. These limitations might lead to mal operation of protective relays due to distorted inputs from current transformers particularly in transient periods. This thesis involved studying the behaviour of current transformers in both steady state and transient periods. An emphasis being put on transient periods which are very crucial in behaviour of current transformers because transformation errors are greatest in these periods. Errors in current transformer transformation might affect operation of entire protection schemes. Maloperation of current transformers in transient periods have very bad effect on relay co-ordination and worst condition might be failure of protection scheme operation altogether. Over the past decades engineers have been trying to develop a current transformer model that would represent a current transformer well in transient periods. It has proved to be rather difficult to come up with a single detailed model that would satisfy all possible conditions. This is due to non-linearity of magnetising curve and saturation effects of current transformer iron cores. The author has considered different current transformer models with their merits and demerits being highlighted. It has been shown that different current transformer models have to be used when considering different operating conditions of a current transformer in a power system. ATP-EMTP an Electromagnetic Transient Program was developed in the sixties for the study of electromagnetic transients in power systems. It has proved to be a very useful tool in this regard. The program development is still going on today to accommodate a wide application in power systems. Several components have been developed to represent different components in a power system. It is only recently that there has been a growing interest to include modelling of protective equipment. This has been accelerated by the inclusion of MODELS in the EMTP program. This thesis explores the effect of transients taking into account different conditions like transient fault currents, effects of high frequency waves and surges. Effects of different types of burdens on current transformers were explored as well. Due to limitations of EMTP, simulation results are only applicable to current transformers with ARMCO M4 oriented steel with ungapped cores. The author arrived at several conclusions. The most important conclusion is that mal operation of protective relays due to current transformer saturation can be avoided easily if proper current transformer selection is given priority in power protection design. EMTP package proved to be very useful and handy when studying transients though one has to be careful with numerical oscillations which might be present during simulations. Problems of numerical oscillations have been discussed under current transformer simulation tools.
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Beckers, Peter C. "Design of a Self Regulated and Protected Electrification Transformer." Thesis, Link to the online version, 2007. http://hdl.handle.net/10019/335.

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Ovadya, Aviv. "Origami transformers : folding orthogonal structures from universal hinge patterns." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/62667.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2010.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 57) and index.
We investigate a new approach to origami design using simple universal hinge patterns where the crease patterns for different shapes are just different subsets of a common hinge pattern. Several algorithms have previously been developed to design folded states for particular shapes, but they require a different crease pattern for each shape. Our motivations include the development of robotic "origami transformers," artistic tools, and theoretical insights. We show how to compose "cube gadgets" to fold any N-cube polycube from an O(N) x O(N) rectangle of paper, using only O(N 2 ) time to compute the parameters of the unambiguous folding sequence. We also describe extensions of our basic algorithm to larger classes of shapes with improved paper efficiency. Finally, we demonstrate that an implementation of this technique can actually be used to partially automate geometric paper folding.
by Aviv Ovadya.
M.Eng.
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Mousavi, Takami Kourosh. "Process Control and Simulation of Ferromagnetic Strip in the Power Transformers and Electrical Machines Applications : Electric power systems." Doctoral thesis, Västerås : School of Sustainable Development of Sociaty and Technology, Mälardalen University, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-6648.

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Zandberg, Hermanus Andries Jakobus. "Wireless transformer condition monitoring system." Thesis, Cape Peninsula University of Technology, 2013. http://hdl.handle.net/20.500.11838/1186.

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The Department of Electrical Engineering in fulfilment of the requirements for the Magister Technologiae in Electrical Engineering at the Cape Peninsula University of Technology November 2013
Pole mounted transformers (PMT) in rural areas present an opportunity for local utilities to do current monitoring on these systems. These transformers are exposed to abnormal amounts of stress due to the vast power demand in these areas. The aim of this study is to develop a more cost-effective condition monitoring system. Transformer current monitoring can be a dangerous practice if not done by suitably trained utility electricians. Hence this study is partly aimed at the elimination of hazardous working environments associated with manual electrical measurements. An investigation to determine a safe and cost-effective way to obtain the electrical measurements required from PMTs is undertaken. Although current measurements can be done with a current clamp-on meter, these measurements still take place at the phases of the transformer and are unsafe. The possibility of implementing wireless data gathering on current clamp-on meters is therefore investigated. This is made possible by a wireless sensor node (WSN) which gathers information and transmits it wirelessly to a WSN base station. This wireless solution is battery powered, necessitating battery replacements, therefore leading to the investigation of magnetic fields, magnetic materials and magnetic induction. A current clamp able to generate a high voltage (HV) output with minimal magnetic field strength is developed. The magnetic fields produced by the transformer’s phase cables are used to generate an alternating voltage. With the help of a microcontroller and an energy harvesting circuit, this voltage is converted and used to charge supercapacitors. The magnetic fields are also used to determine the current flow in the transformer phase cables when the device is not in energy harvesting mode. The device will then undergo comprehensive laboratory testing to determine its accuracy and durability, and is then used to do ‘real life’ current measurements, the results of which are compared against an off-the-shelf current monitoring device.
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Books on the topic "Electrical transformers"

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Pansini, Anthony J. Electrical transformers and power equipment. Englewood Cliffs, N.J: Prentice Hall, 1988.

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Electrical transformers and rotating machines. Albany: Delmar Publishers, 1999.

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Herman, Stephen L. Electrical transformers and rotating machines. 2nd ed. Clifton Park, NY: Thomson Delmar Learning, 2005.

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Electrical transformers and rotating machines. 3rd ed. Clifton Park, NY: Delmar, Cengage Learning, 2012.

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Pansini, Anthony J. Electrical transformers and power equipment. 3rd ed. Lilburn, GA: Fairmont Press, 1999.

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Electrical power: Motors, controls, generators, transformers. Tinley Park, Ill: Goodheart-Willcox Co., 1991.

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Kaiser, Joe. Electrical power: Motors, controls, generators, transformers. Tinley Park, Ill: Goodheart-Willcox, 1998.

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1982, Platnick David d., and Karnas Joseph A. 1932-, eds. Electrical machines and transformers: Principles and applications. Englewood Cliffs, N.J: Prentice-Hall, 1987.

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D, Laramore Robert, ed. An introduction to electrical machines and transformers. 2nd ed. New York: Wiley, 1990.

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Electrical machinery and transformer technology. Fort Worth: Saunders College Pub., 1994.

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Book chapters on the topic "Electrical transformers"

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Gieras, Jacek F. "Transformers." In Electrical Machines, 41–80. Boca Raton : CRC Press, 2017.: CRC Press, 2016. http://dx.doi.org/10.1201/9781315371429-2.

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Krarti, Moncef. "Electrical Transformers." In Energy-Efficient Electrical Systems for Buildings, 51–68. Boca Raton: Taylor & Francis, a CRC title, part of the Taylor & Francis imprint, a member of the Taylor & Francis Group, the academic division of T&F Informa, plc, [2017]: CRC Press, 2017. http://dx.doi.org/10.1201/9781315372297-3.

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Warnes, L. A. A. "Transformers." In Electronic and Electrical Engineering, 279–97. London: Macmillan Education UK, 1994. http://dx.doi.org/10.1007/978-1-349-13012-2_15.

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Melkebeek, Jan A. "Transformers." In Electrical Machines and Drives, 3–47. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-72730-1_1.

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Warnes, Lionel. "Transformers." In Electronic and Electrical Engineering, 298–316. London: Macmillan Education UK, 2003. http://dx.doi.org/10.1007/978-0-230-21633-4_16.

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Warnes, Lionel. "Transformers." In Electronic and Electrical Engineering, 293–311. London: Macmillan Education UK, 1998. http://dx.doi.org/10.1007/978-1-349-15052-6_16.

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Waygood, Adrian. "Transformers." In An Introduction to Electrical Science, 217–25. Second edition. | Abingdon, Oxon; New York, NY: Routledge,: Routledge, 2018. http://dx.doi.org/10.1201/9781351190435-21.

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Morris, Noel M. "Transformers." In Mastering Electronic and Electrical Calculations, 242–63. London: Macmillan Education UK, 1996. http://dx.doi.org/10.1007/978-1-349-13705-3_12.

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Targosz, Roman, Stefan Fassbinder, and Angelo Baggini. "Power Transformers." In Electrical Energy Efficiency, 21–69. Chichester, UK: John Wiley & Sons, Ltd, 2012. http://dx.doi.org/10.1002/9781119990048.ch3.

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Bird, John. "Transformers." In Bird's Electrical Circuit Theory and Technology, 389–411. 7th ed. London: Routledge, 2021. http://dx.doi.org/10.1201/9781003130338-26.

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Conference papers on the topic "Electrical transformers"

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Rapp, Kevin J., Alan Sbravati, John Vandermaar, and Martin Rave. "Evaluation of Transformer Components for High Temperature Transformers." In 2018 IEEE Electrical Insulation Conference (EIC). IEEE, 2018. http://dx.doi.org/10.1109/eic.2018.8481066.

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McLyman, W. T. "Reviewing current transformers and current transducers." In 2007 Electrical Insulation Conference and Electrical Manufacturing Expo (EIC/EME). IEEE, 2007. http://dx.doi.org/10.1109/eeic.2007.4562643.

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Molina, Paula Bastida, David Ribó-Pérez, Lina Montuori, and Carlos Vargas-Salgado. "“Innovation, creativity and entrepreneurship” transversal competence evaluation by technical-economic analysis of commercial electrical transformers." In INNODOCT 2019. Valencia: Universitat Politècnica de València, 2019. http://dx.doi.org/10.4995/inn2019.2019.10115.

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“Innovation, creativity, and entrepreneurship” transversal competence evaluation method (CT04-UPV) used in Electrical Machines course (2nd course, Electrical Engineering Degree) is described in this paper. Its evaluation activity consists of a technical and economic analysis of different commercial electrical transformers, carried out by the students. To this end, students get in touch with electrical suppliers, obtaining real transformers data. With this data, they can calculate transformers efficiency through its energy losses and the economic cost that these losses suppose in a period of 10 years. In this way, students are able to question reality, identifying the existing necessity of evaluating not only its initial cost but also economic cost generated by its energy losses when selecting a transformer. With this method, CT04-UPV learning outcome referred to the 1st domain level is achieved: to question the reality, identifying improvement necessities and generating added value ideas. This methodology has been applied for the last three years in the course. In each year, students marks have been graded by the professor using a rubric. Results indicate that “innovation, creativity, and entrepreneurship” transversal competence learning outcome is satisfactorily reached by students. Moreover, rating survey answered by students, using Google Forms, shows that their level of satisfaction is very high.
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Ebrahimnia-Bajestan, Ehsan, Mohammad Arjmand, and Hani Tiznobaik. "Effect of Waste Vegetable Oil on Cooling Performance and Lifetime of Power Transformers." In ASME 2020 14th International Conference on Energy Sustainability. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/es2020-1716.

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Abstract During the operation of a power transformer, a large amount of heat is generated due to the electrical and magnetic energy losses in its core and windings, causing a temperature rise in transformers. This generated heat is known as the main factor for aging the electrical insulating system of a transformer. In this research, we numerically studied the ability of a vegetable-based oil — as an alternative coolant for the petroleum-based oils — on the cooling performance of a power transformer. The studied oil was a biodiesel produced from waste cooking vegetable oils, having lower viscosity compared to traditional mineral oils. We also calculated the aging rate of the transformer in the presence of the biodiesel. The results indicated that compared to the mineral oil, the average hotspot temperature of the transformer is 3 degrees lower when the biodiesel was used. The life expectancy of the transformer with the vegetable-based oil was also significantly longer than the case with mineral oil. In conclusion, this study provided a sustainable way to use an eco-friendly material produced from a waste resource as an alternative insulating liquid for the cooling of power transformers.
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Svoboda, Michal, and Pavel Trnka. "Alternative electrical insulating fluids in power transformers." In 2014 15th International Scientific Conference on Electric Power Engineering (EPE). IEEE, 2014. http://dx.doi.org/10.1109/epe.2014.6839419.

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McDermid, W., and T. Black. "Experience with 550 kV current transformers." In 2015 IEEE Electrical Insulation Conference. IEEE, 2015. http://dx.doi.org/10.1109/icacact.2014.7223491.

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Moyes, A. "The use of intelligent systems techniques in condition monitoring of electrical plant." In IEE Colloquium on Condition Monitoring of Large Machines and Power Transformers. IEE, 1997. http://dx.doi.org/10.1049/ic:19970495.

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Shaban, Khaled, Ayman El-Hag, and Andrei Matveev. "Predicting transformers oil parameters." In 2009 IEEE Electrical Insulation Conference (EIC) (Formerly EIC/EME). IEEE, 2009. http://dx.doi.org/10.1109/eic.2009.5166344.

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Banach, Henryk. "Voltage regulation in small transformers." In 2017 International Symposium on Electrical Machines (SME). IEEE, 2017. http://dx.doi.org/10.1109/isem.2017.7993577.

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Janura, Richard, Miroslav Gutten, Daniel Korenciak, and Milan Sebok. "Thermal processes in materials of oil transformers." In 2016 Diagnostic of Electrical Machines and Insulating Systems in Electrical Engineering (DEMISEE). IEEE, 2016. http://dx.doi.org/10.1109/demisee.2016.7530470.

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Reports on the topic "Electrical transformers"

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Hansen, Clifford, Thomas Catanach, Austin Glover, Jose Huerta, Zach Stuart, and Ross Guttromson. Modeling Failure of Electrical Transformers due to Effects of a HEMP Event. Office of Scientific and Technical Information (OSTI), July 2020. http://dx.doi.org/10.2172/1644736.

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Cutler, Dylan S., Willy G. Bernal Heredia, and Jesse D. Dean. Case Study: Laboratory and Field Evaluation of Circuit-Level Electrical Submetering with Wireless Current Transformers. Office of Scientific and Technical Information (OSTI), June 2019. http://dx.doi.org/10.2172/1530174.

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McBride, S. PCB (polychlorinated biphenyl) sampling of transformers and electrical devices at Norfolk Naval Base, Norfolk, Virginia. Office of Scientific and Technical Information (OSTI), March 1990. http://dx.doi.org/10.2172/7227477.

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Radhakrishnan, B., H. Buswell, and M. Ferringer. Electrical Core Transformer Using Wire Magnetic Components. Office of Scientific and Technical Information (OSTI), June 2010. http://dx.doi.org/10.2172/983004.

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Clem, Paul, Ellie Wang, and Joseph Kotulski. EMP-Resilient Electric Grid Transformer Analysis. Office of Scientific and Technical Information (OSTI), October 2020. http://dx.doi.org/10.2172/1684647.

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Harrie R. Buswell, PhD, PhD Dennis Jacobs, and Steve Meng. Electrical Core Transformer for Grid Improvement Incorporating Wire Magnetic Components. Office of Scientific and Technical Information (OSTI), March 2012. http://dx.doi.org/10.2172/1036998.

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Electrician falls to his death from an old wooden transformer platform. U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, January 1999. http://dx.doi.org/10.26616/nioshsface98ia053.

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The foreman for an electrical construction and maintenance company in Texas was electrocuted after grabbing energized bayonet fuse in a live front transformer. U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, October 1999. http://dx.doi.org/10.26616/nioshsface99tx202.

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Health hazard evaluation report: HETA-2009-0154-3101, evaluation of magnetic field exposure to office employees from an electrical transformer, Lebanon Correctional Institute, Lebanon, Ohio. U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, January 2010. http://dx.doi.org/10.26616/nioshheta200901543101.

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