Relevant bibliographies by topics / Transformer thermal cycling

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Transformer thermal cycling'

Author: Grafiati
Published: 30 June 2021
Last updated: 29 July 2025

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Journal articles on the topic "Transformer thermal cycling"

1

Galipeau, James, and George Slama. "Characterization and Reliability Testing on an LTCC Transformer Operable to 250 °C." Additional Conferences (Device Packaging, HiTEC, HiTEN, and CICMT) 2012, HITEC (2012): 000354–60. http://dx.doi.org/10.4071/hitec-2012-tha24.

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Environments prone to vibration and shocks can cause premature failure in small wire-wound transformers due to cracked cores and broken wires. These problems are only exacerbated by temperatures exceeding 200 °C where the heat causes organic compounds to age rapidly. As more electronics are used in harsh, high temperature environments, high reliability, compact transformers for use in power, filtering, and isolation applications are needed. To address this need monolithic low-temperature co-fired ceramic transformers were developed. In this work transformers were made from a low-temperature, c
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Yurkiv, Vitaliy, Yasaman AbdiSobbouhi, Qusai Alahmad, and Todd A. Kingston. "(Invited) Thermal Runaway Prediction in Li-Ion Batteries: Combining Experimental Insights with Multiphysics and Transformer-Based Models." ECS Meeting Abstracts MA2025-01, no. 8 (2025): 822. https://doi.org/10.1149/ma2025-018822mtgabs.

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Thermal runaway (TR) in commercial lithium-ion batteries (LIBs), is a critical challenge for electric vehicles (EVs) safety. This research presents a comprehensive approach to predicting and mitigating TR by integrating experimental testing, multiphysics modeling, and machine learning (ML). Experimental tests were conducted on high capacity commercial cylindrical batteries (e.g., 24 Ah) under thoroughly controlled temperature and humidity conditions, with surface temperatures monitored via FLIR infrared cameras and thermal sensors. Battery cycling was performed across a range of C-rates, inclu
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Gaynes, Michael, Timothy Chainer, Edward Yarmchuk, et al. "Using In situ Capacitance Measurements to Monitor the Stability of Thermal Interface Materials in Complex PCB Assemblies." International Symposium on Microelectronics 2010, no. 1 (2010): 000450–57. http://dx.doi.org/10.4071/isom-2010-wa3-paper4.

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A thermal solution for an array of voltage transformer modules which are cooled by a large area, common aluminum heat spreader for a high end server was evaluated using an in situ, capacitive bond line thermal measurement technique. The method measures the capacitance of a non-electrically conducting thermal interface material (TIM) between the electronic module and heat spreader to quantify the TIM bond line effective thickness during assembly and operation. The thermal resistance of the TIM has the same geometric dependence as the inverse of capacitance, therefore, the capacitive technique a
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Tokarev, Mikhail. "A Double-Bed Adsorptive Heat Transformer for Upgrading Ambient Heat: Design and First Tests." Energies 12, no. 21 (2019): 4037. http://dx.doi.org/10.3390/en12214037.

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A full scale lab prototype of an adsorptive heat transformer (AHT), consisting of two adsorbers, an evaporator, and a condenser, was designed and tested in subsequent cycles of heat upgrading. The composite LiCl/SiO2 was used as an adsorbent with methanol as an adsorbtive substance under boundary temperatures of TL/TM/TH = −30/20/30 °C. Preliminary experiments demonstrated the feasibility of the tested AHT in continuous heat generation, with specific power output of 520 W/kg over 1–1.5 h steady-state cycling. The formal and experimental thermal efficiency of the tested rig were found to be 0.5
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Savin, Olivian, Carmen Badina, Renaud Pollier, et al. "Effect of start and stop cycles on hydropower plants: modelling the deterioration of the equipment to evaluate the cycling cost." IOP Conference Series: Earth and Environmental Science 1136, no. 1 (2023): 012057. http://dx.doi.org/10.1088/1755-1315/1136/1/012057.

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Abstract With the high energy demand, renewable energies emerged and the deregulation of the energy market appeared in the late ’90. These types of energies are intermittent and can produce high fluctuations in the power grid because they are connected only in certain weather conditions (for example: solar energy can be produced only by day and wind energy only when it is windy). Hydropower energy is recognized for its flexibility in responding to the demands of the network in order to maintain a constant level of energy and to guarantee the security of the electrical network. Nowadays, the hy
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Hisada, Shota, Mitsuhiro Matsuda, Minoru Nishida, Carlo Biffi, and Ausonio Tuissi. "Microstructure and Martensitic Transformation Behavior in Thermal Cycled Equiatomic CuZr Shape Memory Alloy." Metals 9, no. 5 (2019): 580. http://dx.doi.org/10.3390/met9050580.

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Equiatomic CuZr alloy undergoes a martensitic transformation from the B2 parent phase to martensitic phases (P21/m and Cm) below 150 °C. We clarified the effect of the thermal cycling on the morphology and crystallography of martensite in equiatomic CuZr alloy using a transmission electron microscopy. The 10th cycled specimens consisted of different multiple structures at the maximum temperature of differential scanning calorimetry (DSC) measurement −400 °C and 500 °C, respectively. At the maximum temperature 400 °C of DSC measurement, it is composed of the fine plate-like variants, and a lame
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Daróczi, Lajos, Tarek El Rasasi, and Dezső L. Beke. "Effect of Partial Thermal Cycles on Non-Chemical Free Energy Contributions in Polycrystalline Cu-Al-Be Shape Memory Alloy." Materials Science Forum 738-739 (January 2013): 38–45. http://dx.doi.org/10.4028/www.scientific.net/msf.738-739.38.

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Abstract. Thermoelasic martensitic transformations are controlled by the local equilibrium of chemical and non-chemical free energy contributions (D and E being the dissipative and elastic energies, respectively). The derivatives of non-chemical free energies ( ) as a function of the transformed martensite fraction (ξ) can be expressed from the experimental data obtained from the temperature-elongation, temperature-resistance, etc hysteresis loops. This method, developed in our laboratory, was used for the investigation of non complete, partial thermoelastic transformation cycles. In the first
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Sitepu, H., Heinz Günter Brokmeier, Daniel Chateigner, and J. P. Wright. "Crystallographic Phase Composition and Structural Analysis of Ti-Ni-Fe Shape Memory Alloy by Synchrotron Diffraction." Solid State Phenomena 105 (July 2005): 139–44. http://dx.doi.org/10.4028/www.scientific.net/ssp.105.139.

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The preferred crystallographic orientation (i.e. texture) and the non-transformed austenite can cause serious systematic errors in the structural study of the R-phase in 50.75at.%Ti- 47.75at.%Ni-1.50at.%Fe (hereafter referred to as Ti-Ni-Fe ternary) shape memory alloy. The crystal structure refinement of R-phase synchrotron high resolution powder diffraction (SRD) data using Rietveld refinement with generalized spherical harmonic (GSH) description for preferred orientation correction showed that the sample consists of minor cubic phase and the space group was 3 P [1]. The objective of the pres
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Wertz, Markus, Florian Fuchs, Hieronymus Hoelzig, et al. "The Influence of Surface Preparation, Chewing Simulation, and Thermal Cycling on the Phase Composition of Dental Zirconia." Materials 14, no. 9 (2021): 2133. http://dx.doi.org/10.3390/ma14092133.

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The effect of dental technical tools on the phase composition and roughness of 3/4/5 yttria-stabilized tetragonal zirconia polycrystalline (3y-/4y-/5y-TZP) for application in prosthetic dentistry was investigated. Additionally, the X-ray diffraction methods of Garvie-Nicholson and Rietveld were compared in a dental restoration context. Seven plates from two manufacturers, each fabricated from commercially available zirconia (3/4/5 mol%) for application as dental restorative material, were stressed by different dental technical tools used for grinding and polishing, as well as by chewing simula
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Hu, Tian Qi, Hong Tao Chen, and Ming Yu Li. "Fabrication of Cu@Sn Core-Shell Structured Particles and the Application in High Remelting Temperature Bonding." Materials Science Forum 878 (November 2016): 3–7. http://dx.doi.org/10.4028/www.scientific.net/msf.878.3.

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A novel solder bonding material for high-temperature applications based on Cu@Sn core-shell structured particles was developed, and the fabricated Cu@Sn particles were compressed into preforms for die attachment. The reflow temperature for this bonding material could reached as low as 260°C due to the low melting temperature of the outer Sn layer. However, after reflow soldering, the resulting interconnections can withstand a high temperature of at least 415°C, outer Sn layer completely transformed into Cu-Sn intermetallic compounds (IMCs) with high remelting temperatures. The formed bondlines
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Dissertations / Theses on the topic "Transformer thermal cycling"

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Luedtke, Elin. "Minimizing Transformer No-Load Losses at Hydropower Plants : A Study of Effects from Transformer Switch-Off During Stand-by Operation." Thesis, Uppsala universitet, Institutionen för fysik och astronomi, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-447635.

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Hydropower is the most important power balancing resource in the Swedish electrical power system, regulating the power supply to match the load. Consequently, several hydropower plants have periods of stand-by operation where the power production is absent but where several devices within a plant are still active. Such a device is the step-up power transformer, which during stand-by operation still generates no-load energy losses. These losses can accumulate to a considerable amount of energy and costs during the long technical lifetime of the apparatus. One option to minimize these no-load en
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Book chapters on the topic "Transformer thermal cycling"

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Swaminathan, G., and Vedamanickam Sampath. "Thermal and Thermomechanical Cycling Studies of Nickel-Based Shape Memory Alloys for Engineering and Medical Applications." In Advanced Materials for Emerging Applications (Innovations, Improvements, Inclusion and Impact). BENTHAM SCIENCE PUBLISHERS, 2024. http://dx.doi.org/10.2174/9789815196771124010006.

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Shape memory alloys (SMAs) are those that can return to their initial shape after deformation under a stimulus, such as temperature or stress. They are capable of recovering deformations of up to 8%. Generally, the martensitic transformation is reversible in nature and the shape memory alloys exhibit two unique characteristics, super-elasticity effect (SE) and shape memory effect (SME), depending on whether these properties/responses are brought on by stress and temperature, respectively. Since the shape memory alloys undergo full cycling, they transform from austenite to martensite at tempera
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Shahinpoor, Mohsen. "Review of Shape Memory Alloys (SMAs) as Smart Materials." In Fundamentals of Smart Materials. The Royal Society of Chemistry, 2020. http://dx.doi.org/10.1039/bk9781782626459-00136.

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Chapter 12 reviews shape memory alloys (SMAs). The shape memory effect (SME) is a property of materials that are capable of solid phase transformation from a body-centered tetragonal form called thermoelastic martensite to a face-centered cubic superelastic called austenite. These materials are named shape memory materials (SMM) and their thermal versions are called shape memory alloys (SMAs). This solid phase transformation from the body-centered tetragonal martensite crystalline structures to a thermoelastic face-centered cubic austenite crystalline phase by either temperature, stress or str
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Conference papers on the topic "Transformer thermal cycling"

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Nwazor, Nkolika O., Justice C. Erowele, Remigius O. Okeke, Ekene S. Mbonu, and Otelemate M. Horsfall. "Energy Optimization of Wireless Body Area Network(WBAN) Using TDMA Duty Cycling and Thermal Energy Harvesting." In Africa International Conference on Clean Energy and Energy Storage. Trans Tech Publications Ltd, 2025. https://doi.org/10.4028/p-1wcg7x.

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Energy harvesting is an effective technique for optimizing Wireless Body Area Network (WBAN) devices used for continuous healthcare services delivery. Despite the growing popularity of WBANs in recent years due to their potential to transform healthcare, energy consumption remains a critical issue. This is due to several factors such as the limited capacity of batteries in smaller sensor nodes, the continuous operation that drains batteries and renders the nodes inoperable, and the impracticality of replacing batteries in situations where the sensors are implanted in the human body and would r
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Montazeri, Mahsa, John Harris, David R. Huitink, Adithya Venkatanarayanan, and Simon S. Ang. "Thermomechanical Stress and Warpage Augmentation Using Auxetic Features in Electronic Design." In ASME 2019 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/ipack2019-6424.

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Abstract One of the leading contributors to assembly and reliability issues in electronic packaging arises from warpage and interfacial stresses stemming from coefficient of thermal expansion (CTE) mismatch of the interfacing components. Trends toward miniaturizing and increasing density of the electronic packages exacerbate the assembly problems, leading to issues such as die cracking and board level assembly yield loss. One potential solution may be found in the inclusion of auxetic structures, which demonstrate negative Poisson’s ratio through re-entrant geometries, which has been investiga
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Novković, Marko, Patrick Picher, Federico Torriano, and Zoran Radaković. "THERMAL MONITORING OF LIQUID IMMERSED POWER TRANSFORMERS BASED ON DETAILED DYNAMIC THERMAL-HYDRAULIC MODEL." In 14. Savetovanje o elektrodistributivnim mrežama Srbije, sa regionalnim učešćem,. CIRED Liaison Committee of Serbia, 2024. http://dx.doi.org/10.46793/cired24.i-1.14mn.

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The substantial mass and consequent thermal inertia of liquid immersed power transformers (LIPT) make it feasible to load them over nameplate rating. This possibility is considered in IEC standard 60076-7. This is of interest during short-time cyclic overloading or short-time emergency loading in the event of power network element outages. It is imperative to prevent exceeding critical temperatures in different parts of the transformer to prevent sudden failures caused by bubbling phenomena or accelerated ageing. To ensure safe loading over nameplate rating, it is necessary to calculate the ch
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Chen, M. W., M. L. Glynn, D. Pan, et al. "Influence of Martensitic Transformation on the Durability of TBC Systems (Invited)." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-43203.

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Microstructural evolution of bond coat with thermal cycling was characterized with transmission electron microscopy (TEM) and high temperature X-ray diffraction (HT-XRD) analysis. Before thermal cycling, the structure of asfabricated bond coat was confirmed to be a long-range ordered B2 β-phase. After thermal cycling to ∼28% of the cyclic life, the bond coat was found to transform into a Nirich L10 martensite (M) from its original B2 structure. The transformations, M ↔ B2, were demonstrated to be reversible and to occur on heating and cooling in each cycle. Quantitative high temperature XRD me
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Ahmad, Mudasir, Weidong Xie, Kuo-Chuan Liu, Jie Xue, and Dave Towne. "Parametric acceleration transforms for lead-free solder joint reliability under thermal cycling conditions." In 2009 IEEE 59th Electronic Components and Technology Conference (ECTC 2009). IEEE, 2009. http://dx.doi.org/10.1109/ectc.2009.5074087.

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Pendyala, Swetha, Prashanth Sridharan, Sarada Kuravi, et al. "Macroencapsulation of Sodium Nitrate for Thermal Energy Storage in Solar Thermal Power." In ASME 2012 6th International Conference on Energy Sustainability collocated with the ASME 2012 10th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/es2012-91447.

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Storage systems based on latent heat storage have high-energy storage density, which reduces the footprint of the system and the cost. However, phase change materials (PCMs) have very low thermal conductivities making them unsuitable for large-scale use without enhancing the effective thermal conductivity. In order to address the low thermal conductivity of the PCMs, macroencapsulation of PCMs is adopted as an effective technique. The macro encapsulation not only provides a self-supporting structure but also enhances the heat transfer rate. In this research, Sodium nitrate (NaNO3), a low cost
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Chen, Bicheng, and Cemal Basaran. "Continuous Wavelet Transform Based Nanoscale Strain Field Measurement Using Moire´ Interferometry With Phase Shifting." In ASME 2009 InterPACK Conference collocated with the ASME 2009 Summer Heat Transfer Conference and the ASME 2009 3rd International Conference on Energy Sustainability. ASMEDC, 2009. http://dx.doi.org/10.1115/interpack2009-89016.

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Moire´ Interferometry (MI) provides real-time full strain field measurement for the structure under the dynamic loading. It has been successfully applied to the reliability testing of the electronic packaging under different loadings (e.g. thermal cycling, electrical current stressing and etc). The miniaturization of the microelectronic packaging calls for the operation of MI at a level with higher sensitivity and better resolution. The proposed operation of MI combines two novel methods in the interferometry, phase shifting (PS) and continuous wavelet transform (CWT) to achieve a 164 nm/pixel
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Menon, Nalini C., April Nissen, Keri McArthur, Bernice Mills, Fitzjames Ryan, and Kevin Simmons. "Evaluation of Common Thermoplastic Polymers in High-Pressure Cycling Hydrogen Under Ambient and Cold Environments as Applicable to the Hydrogen Infrastructure." In ASME 2024 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2024. http://dx.doi.org/10.1115/pvp2024-123905.

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Abstract Thermoplastic polymers are required to perform consistently without failing under stringent conditions of changing pressures (35 MPa to 70 MPa) and temperatures (−40°C to +85°C) in storage and fueling operations. Although diffusivity in glassy polymers appears to be an order of magnitude lower than elastomers, polymer microstructural attributes such as degree of crystallinity and presence of polar and non-polar groups on the main chain with and without branching can play a substantial role in influencing their behaviors in hydrogen environments. The work described here addresses the e
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Dubsky, J., B. J. Kolman, and A. Buchal. "Phase Composition Changes in Plasma Sprayed Zircon-Alumina Tubes." In ITSC 1998, edited by Christian Coddet. ASM International, 1998. http://dx.doi.org/10.31399/asm.cp.itsc1998p1613.

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Abstract Protective tubes (Ø90x1500 mm) were manufactured by spraying with a water stabilized plasma gun. Mixtures of zircon (ZrSiO4) and alumina (Al2O3) were used as feedstock powders. Products made of these powders exhibit very good properties during thermal cycling. Previous results of the phase composition and phase changes were obtained from as-sprayed and annealed samples using X-ray diffractometry (XRD) and scanning electron microscopy. During plasma spraying zircon decomposed into ZrO2 and SiO2, which on impact and after rapid quenching formed a very fine eutectic mixture of tetragonal
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Boucly, Vincent, Daniel Ne´lias, and Michel Brunet. "Thermal-Elastic-Plastic Contact Analysis for Rough Bodies With a Semi-Analytical Method." In ASME/STLE 2007 International Joint Tribology Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ijtc2007-44067.

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Nowadays, Finite Elements softwares allow the user to model efficiently the contact between two solids. It is though necessary to make numerous assumptions in order to compute a contact in a reasonable time: generally surfaces are smooth and the mesh is too coarse to accurately study transient phenomena. Moreover, friction on the surface is rarely taken into account since models are usually axi-symmetric. This paper presents a semi-analytical formulation that allows computing the contact between two elastic-plastic solids with rough surfaces. The numerical methods used, i.e. the conjugate grad
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