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Ganga, S.
- Selection of an optimum flux density to offer reduced core loss and its effect on temperature rise of transformers
Abstract Views :210 |
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Authors
Affiliations
1 Joint Director, Heat Run Test Laboratory, Insulation Division, Central Power Research Institute, Bangalore - 560 080, IN
2 Engineering Officer, Insulation Laboratory, Central Power Research Institute, Bangalore - 560 080, IN
3 Additional Director, Insulation Division, Central Power Research Institute, Bangalore - 560 080, IN
1 Joint Director, Heat Run Test Laboratory, Insulation Division, Central Power Research Institute, Bangalore - 560 080, IN
2 Engineering Officer, Insulation Laboratory, Central Power Research Institute, Bangalore - 560 080, IN
3 Additional Director, Insulation Division, Central Power Research Institute, Bangalore - 560 080, IN
Source
Power Research, Vol 13, No 2 (2017), Pagination: 197-202Abstract
Commonly used grades for transformer core stampings are Cold Rolled Grain Oriented Steel of grades M3, M4, M5 and M6. As the flux density increases, the magnitude of no load loss and no load current increases. But studies also indicated that, a given magnitude of core loss can be attained with both high and low magnitudes of no load current. This result can be used to ascertain the presence of inferior grade core material. It is essential to operate the transformer in the linear region of BH curve. Operation in saturated state will result in increased no load current which in turn will have a detrimental effect on the temperature rise of transformer as additional I2R losses are generated. With the limits of temperature rise being more stringent in IS standard than in IEC, the choice of flux density is crucial. In this paper an attempt is made to realize the best operational flux density, which gives a benchmark for deciding the magnitude of no load current and the corresponding no load power factor.Keywords
No load losses, copper losses, temperature rise, CRGO- Review on degradation of EVA encapsulated PV Module by UV ageing
Abstract Views :184 |
PDF Views:0
Authors
N. V. Lahari
1,
S. Ganga
2
Affiliations
1 Project Associate, Insulation Division, Central Power Research Institute,Bangalore, IN
2 Additional Director, Insulation Division, Central Power Research Institute, Bangalore, IN
1 Project Associate, Insulation Division, Central Power Research Institute,Bangalore, IN
2 Additional Director, Insulation Division, Central Power Research Institute, Bangalore, IN
Source
Power Research, Vol 13, No 2 (2017), Pagination: 223-230Abstract
Solar energy is considered to be one of the prime sources of renewable energy for the generation of electrical energy, which is gaining the importance in recent time in India and there is a plan to generate 200GW of solar energy by 2024. Solar energy is absorbed by Photo-Voltaic (PV) cells and converted into electrical energy. Such PV cells are connected in series and parallel combination to generate required output power. Hence, Photo-Voltaic (PV) modules must be in operation for long time without any reduction in output and efficiency. In recent times, to achieve this, both surfaces of PV module are encapsulated by Ethylene-Vinyl-Acetate (EVA) polymer, but UV radiations leads to degradation of EVA polymer, which results in deterioration of PV module, thus overall efficiency and output of module reduces. Various UV accelerated ageing studies and investigations have predicted service time of module. The objective of this investigation is to review the available literature with respect to types of PV cells & encapsulant used, UV ageing parameters & instruments employed and envision a way forward in employing EVA with nano additives as an encapsulant to improve its performance.Keywords
Solar energy; Photovoltaics; Ethylene-Vinyl-Acetate polymer;Encapsulation; Accelerated UV ageing- Impact of Ultraviolet Radiation on an Artifi cially Polluted Silicone Rubber during Inclined Plane Tracking Test
Abstract Views :186 |
PDF Views:0
Authors
Affiliations
1 Central Power Research Institute, Bangalore-560080, IN
1 Central Power Research Institute, Bangalore-560080, IN