Power Transformers Articles
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Transformer oil purification
Why degas transformer oil? Maybe the first question should be, “why is it important to have purified oil in a transformer?” Dissolved gasses in transformer oil can cause arcing, corona discharges, and overheating--reducing the electrical efficiency and lifetime of the transformer. Likewise, water contamination at levels as low as 30 ppm (parts per million) can adversely affect the ...
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A novel harmonic mitigator-based 12-pulse rectification for vector-controlled induction motor drives
This paper presents an optimised 12-pulse autotransformer-based AC–DC converter with reduced kVA magnetics for reducing the harmonic distortion in AC mains current in a vector-controlled induction motor drive (VCIMD). The proposed AC–DC converter results in elimination of fifth, seventh and 11th harmonics in the supply current. The proposed system consists of an autotransformer and a tuned ...
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Analysis and design of single-phase power factor-corrected AC–DC Cuk converter with high-frequency isolation
In this paper, an analysis and design of a high-frequency transformer isolated single-phase buck-boost AC–DC Cuk converter is presented for both discontinuous and continuous conduction modes (DCM and CCM) of operation. Both modes of operation are considered for the design of 2.6-kW rating with high-level steady-state and dynamic performance. A comparative analysis of Cuk converter is also ...
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Characterisation of power quality disturbances based on wavelet transforms
This paper presents a new technique for detecting and characterising disturbances in power systems based on wavelet transforms. The voltage signal under investigation is often corrupted by noises, therefore the voltage signal is first denoised using wavelet thresholding and then wavelet transform is applied to the denoised signal. Using the first-level detail wavelet coefficients, the voltage ...
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Pathways to innovation in Asia's leading electronics-exporting countries – a framework for exploring drivers and policy implications
This paper offers a framework for exploring emerging pathways to innovation in Asian electronics industries, as well as their drivers and policy implications. The focus is on "stylised facts" rather than on the diversity of specific country trajectories. I demonstrate that the role of Asia's leading players in the electronics industry is changing – from global export production bases for hardware ...
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Technology transformation and purposed play: model development and implications for high tech product development
High technology companies increasingly meet the demand for rapid innovation by building on the work done by other firms. Many high technology firms use technology transformation, adding their own Intellectual Property (IP) to others' platform technologies to create their own breakthrough innovations or new technologies. Transformation examples can be found in many industries (automobile, consumer ...
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Comparative study on potential business opportunities: China, USSR, Eastern Europe
This paper identifies changes which have taken place in the world's political and economic structure, such as the cessation of the Cold War, the Middle Eastern crisis, etc. It suggests causes of such changes. The paper then considers the alternative market opportunities that have been created for small-and medium-sized US businesses that have evolved as a result of this transformation. It ...
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Changing production paradigm and the transformation of knowledge existing form
There are many studies concerning the changes in the production paradigm. However, few of them put knowledge transformation as a centrepiece to examine its role in forging the production system. This paper, by introducing an idea of three-existing-form of technology, argues that Fordism is nurtured by a stable and one-step knowledge transformation pattern. In contrast, post-Fordism is nurtured by ...
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The transformational effects of technology on operations management
Over the years, advances in technology have transformed key aspects of operations management. New tools and technologies have been incorporated into the design and operation of service and production systems. Textbooks play an integral role in documenting the transformational effects of technology in specific fields. In this paper, the evolution of technology, its transformational effects, and ...
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Some elements of energy conservation policy under the energy policy guidelines of Poland
This paper discusses the energy conservation policy issues in the context of an overall state energy policy, including regulations which came into force under the new Energy Law provisions. As a result of the analysis performed, it was confirmed that in the period of market transformation in Poland, a key factor of energy efficiency improvement would be an appropriate energy pricing policy. At ...
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