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Transformers and inductors for power electronics
Based on the fundamentals of electromagnetics, this clear and concise text explains basic and applied principles of transformer and inductor design for power electronic applications. It details both the theory and practice of inductors and transformers employed to filter currents, store electromagnetic energy, provide physical isolation between circuits, and perform stepping up and down of DC and AC voltages.
The authors present a broad range of applications from modern power conversion systems. They provide rigorous design guidelines based on a robust methodology for inductor and transformer design. They offer real design examples, informed by proven and working field examples.
Key features include:
* emphasis on high frequency design, including optimisation of the winding layout and treatment of non-sinusoidal waveforms
* a chapter on planar magnetic with analytical models and descriptions of the processing technologies
* analysis of the role of variable inductors, and their applications for power factor correction and solar power
* unique coverage on the measurements of inductance and transformer capacitance, as well as tests for core losses at high frequency
* worked examples in MATLAB, end-of-chapter problems, and an accompanying website containing solutions, a full set of instructors' presentations, and copies of all the figures.
Covering the basics of the magnetic components of power electronic converters, this book is a comprehensive reference for students and professional engineers dealing with specialised inductor and transformer design. It is especially useful for senior undergraduate and graduate students in electrical engineering and electrical energy systems, and engineers working with power supplies and energy conversion systems who want to update their knowledge on a field that has progressed considerably in recent years.
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Correction: Research on partial discharge signal recognition and classification of power transformer based on acoustic-VMD and CNN-LSTM
[This corrects the article DOI: 10.1371/journal.pone.0335447.].
Journal Article
Correction: Based on PCA and SSA-LightGBM oil-immersed transformer fault diagnosis method
[This corrects the article DOI: 10.1371/journal.pone.0314481.].
Journal Article
Adsorption Mechanisms of TMsub.3 -Decorated Tin Sulfide Monolayers for the Decomposition of Gas Components under Fault Conditions in Oil-Immersed Transformers
Oil-immersed transformers play a pivotal role owing to their environmentally friendly characteristics, compact footprint, and cost-effectiveness. Ensuring the online monitoring of oil-immersed transformers is a fundamental measure to ensure the secure and stable operation of modern power systems. In this paper, metal particle cluster-doped SnS is firstly used in the adsorption and sensing of decomposition components (CO, C[sub.2]H[sub.2]) under fault conditions in oil-immersed transformers. The study comprehensively analyzed band structure, differential charge density, density of states, and molecular orbital theory to unveil the adsorption and sensing mechanisms of target gases. The findings suggest that the modification of metal particle clusters can enhance the surface electronic properties of single-layer SnS. In the regions of metal particle clusters and the gas–surface reaction area, electronic activity is significantly heightened, primarily attributed to the contribution of d-orbital electrons of the metal cluster structures. The modified SnS exhibits adsorption capacity in the following order: Ru[sub.3]-SnS > Mo[sub.3]-SnS > Au[sub.3]-SnS. Additionally, the modified material demonstrates increased competitiveness for C[sub.2]H[sub.2], with adsorption types falling under physical chemistry adsorption. Different metal elements exert diverse effects on the electronic distribution of the entire system, providing a theoretical foundation for the preparation of corresponding sensors. The findings in this work offer numerical insights for the further preparation and development of SnS nanosensors, concurrently shedding light on the online monitoring of faults in oil-immersed transformers.
Journal Article
Enhanced RF Energy Harvesting System Utilizing Piezoelectric Transformer
RF energy harvesting converts ambient signals into electrical power, providing a sustainable energy source. This study demonstrates the use of a piezoelectric transformer for efficient RF energy harvesting. In this work, a piezoelectric transformer (PT) is employed as a high-gain, efficient inverting amplifier to enhance RF wireless energy harvesting. The PT, composed of lead zirconate titanate (PZT), is placed after the receiving loop antenna, with its output connected to an AC-to-DC converter circuit. Maximum harvested power was observed at the PT’s resonance frequency of 50 kHz, with an optimal load of 40 kΩ. The system, comprising the antenna, transformer, and rectifier circuit, continues to resonate at 50 kHz, as confirmed by input impedance measurements, demonstrating stable and effective performance. The overall system efficiency was characterized to be 88%.
Journal Article
Rosen-Type Piezoelectric Transformers Based on 0.5BaTiOsub.3 Ceramic and Doped with Sbsub.2Osub.3
In this study, the characteristics in the lead-free piezoelectric ceramic 0.5Ba(Zr[sub.0.2]Ti[sub.0.8])O[sub.3]−0.5(Ba[sub.0.7]Ca[sub.0.3])TiO[sub.3] (0.5BZT–0.5BCT) were investigated to assess its potential for Rosen-type piezoelectric transformers. This piezoelectric ceramic has a piezoelectric charge coefficient d[sub.33] of 430 pC/N, an electromechanical coupling factor k[sub.p] of 49%, a dielectric constant ε[sub.r] of 2836, a remnant polarization P[sub.r] of 4.98 μC/cm[sup.2], and a coercive electric field E[sub.c] of 2.41 kV/cm. Sb[sub.2]O[sub.3] was soft doped with 0.05, 0.1, 0.15, and 0.2 mol%, respectively, and exhibited excellent physical properties at 0.1 mol%. Based on this, a piezoelectric transformer was fabricated and measured, and it showed better output characteristics than pure 0.5BZT–0.5BCT. The amplification ratio (V[sub.out]/V[sub.in]) was optimized based on the device geometry and properties of the piezoelectric material. Moreover, the output characteristics of the Rosen−type piezoelectric transformer were simulated with the PSpice program. Output values of the fabricated and simulated piezoelectric transformers for the r vibrational frequency were compared and analyzed. Accordingly, the step-up amplification ratios V[sub.out]/V[sub.in] of the fabricated and simulated devices at the vibrational frequency were compared as well. This piezoelectric transformer could replace silicon steel transformers and be used for the creation of black light and for laptop chargers.
Journal Article
Transformer Ageing
<p>This book is a one-stop guide to state-of-the-art research in transformer ageing, condition monitoring and diagnosis. It is backed by rigorous research projects supported by the Australian Research Council in collaboration with several transmission and distribution companies. Many of the diagnostic techniques and tools developed in these projects have been applied by electricity utilities and would appeal to both researchers and practicing engineers. Important topics covered in this book include transformer insulation materials and their ageing behaviour, transformer condition monitoring techniques and detailed diagnostic techniques and their interpretation schemes. It also features a monitoring framework for smart transformers as well as a chapter on biodegradable oil.</p> <ul> <li>Offers a comprehensive coverage of transformer ageing topics including insulation materials, dielectric properties and ageing mechanisms, condition monitoring and diagnostic techniques</li> <li>Features chapters on smart transformer monitoring frameworks, transformer life estimation and biodegradable oil behaviour</li> <li>Highlights industrially relevant techniques adopted in electricity utilities, backed by extensive research</li> </ul> <p><i>Transformer Ageing: Monitoring and Estimation Techniques</i> is an industrially relevant and essential textbook for graduate students, engineers and researchers studying transformers and condition monitoring techniques. It is also a helpful reference for industry professionals working in transformer condition monitoring and life assessment.</p>
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