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Karmakar, Subrata
- Dolomitic carbonatite from the Chotanagpur Granite Gneiss Complex:A New DARC (Deformed Alkaline Rocks and Carbonatite) in the Precambrian shield of India
Abstract Views :346 |
PDF Views:113
Authors
Satabdi Das
1,
Nandini Dasgupta
1,
Sanjoy Sanyal
1,
Shyamal Sengupta
1,
Subrata Karmakar
1,
Pulak Sengupta
1
Affiliations
1 Department of Geological Sciences, Jadavpur University, Kolkata-700 032, IN
1 Department of Geological Sciences, Jadavpur University, Kolkata-700 032, IN
Source
Current Science, Vol 113, No 06 (2017), Pagination: 1038-1040Abstract
The Chotanagpur Granite Gneiss Complex (CGGC) of the East Indian Shield records a protracted geological history ranging from Palaeo- to Meso- to Neoproterozoic time. It is commonly believed that the whole of the CGGC behaved as a unified crustal block at least from 1600 Ma (ref. 3). The E-W to ENE-WSW trending North Purulia Shear Zone (NPSZ) dissects and geographically divides the CGGC into the northern and southern blocks.References
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- Chatterjee, N., Banerjee, M., Bhattacharya, A. and Maji, A. K., Precambrian Res., 2010, 179, 99–120.
- Dey, A., Mukherjee, S., Sanyal, S., Ibanez-Mejia, M. and Sengupta, P., In Sediment Provenance (ed. Mazumdar, R.), Elsevier, Amsterdam, 2016, pp. 453–486.
- Maji, K., Goon, S., Bhattacharya, A., Mishra, B., Mahato, S. and Bernhardt, H.-J., Precambrian Res., 2008, 162, 385–402.
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- Woolley, A. R., Alkaline Rocks and Carbonatites of the World, The Geological Society of London, 2001, p. 372.
- Rekha, S., Upadhyay, D., Bhattacharya, A., Kooijman, E., Goon, S., Mahato, S. and Pant, N. C., Precambrian Res., 2011, 187, 313–333.
- Burke, K., Ashwal, L. D. and Webb, S. J., Geology, 2003, 31, 391–394.
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- Evaluation of Partial Discharge Aged Transformer Oil using Optical Spectroscopy Techniques
Abstract Views :262 |
PDF Views:1
Authors
Affiliations
1 Department of Electrical Engineering, National Institute of Technology, Rourkela – 769008, IN
1 Department of Electrical Engineering, National Institute of Technology, Rourkela – 769008, IN
Source
Power Research, Vol 15, No 2 (2019), Pagination: 130-135Abstract
In recent times, optical spectroscopy techniques are being widely accepted for chemical analysis of transformer oil. These techniques gained popularity because of the advantages like they are quite simple to perform, give results very quickly, outcome is reliable, and they are economical. Unlike traditional methods, these can also be carried out online with cost effective equipments. In this work, breakdown voltage test is done and then, UV-Visible (UV-Vis) spectroscopy and Fourier Transform Infrared (FTIR) spectroscopy techniques have been used to investigate the condition of the transformer oil. To replicate the actual aging of oil in field, partial discharge (PD) in the laboratory environment has aged oil samples. Test results obtained from UV-Vis spectroscopy gives the qualitative analysis of transformer oil and FTIR spectroscopy evaluates the functional group present in it. The analysis is done precisely by relating the optical spectra obtained by spectroscopy techniques with the duration of aging. The results obtained justify that the optical spectroscopy techniques used, can accurately analyze the condition of aged transformer oil.Keywords
Fourier Transform Infrared, Partial Discharge, Spectroscopy, Ultraviolet Visible Spectroscopy, Transformer Oil.References
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- Tsuboi T, Takami J, Okabe S, Inami K, Aono K. Partial discharge aging effect on insulation reliability evaluation with Weibull distribution for oil-immersed transformers. IEEE Transactions on Dielectrics and Electrical Insulation. 2010 Dec; 17(6):1869-76. https://doi.org/10.1109/ TDEI.2010.5658240
- Kiiza RC, Niasar MG, Nikjoo R, Wang X, Edin H. The effect of partial discharge by-products on the dielectric frequency response of oil-paper insulation comprising of a small cavity. IEEE Transactions on Dielectrics and Electrical Insulation. 2015 Oct; 22(5):2923-30. https://doi.org/10.1109/TDEI.2015.004424
- Gómez NA, Wilhelm HM, Santos CC, Stocco GB. Dissolved Gas Analysis (DGA) of natural ester insulating fluids with different chemical compositions. IEEE Transactions on Dielectrics and Electrical Insulation. 2014 Jun; 21(3):1071- 8. https://doi.org/10.1109/TDEI.2014.6832250
- Bakar NA, Abu-Siada A, Islam S, El-Naggar MF. A new technique to measure interfacial tension of transformer oil using UV-Vis spectroscopy. IEEE Transactions on Dielectrics and Electrical Insulation. 2015 Apr; 22(2):1275- 82. https://doi.org/10.1109/TDEI.2015.7076831
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- Kalathiripi H, Karmakar S. Fault analysis of oil-filled power transformers using spectroscopy techniques. 9th IEEE International Conference on Dielectric Liquids (ICDL), Manchester, United Kingdom; 2017 Jun. https://doi.org/10.1109/ICDL.2017.8124633
- Cui Y, Zhu L, Ji S, Cao P, Zhang F. Partial discharge development in needle-plane configuration of oil-paper insulation under ac voltage. IEEE Transactions on Dielectrics and Electrical Insulation. 2017 Aug; 24(4):2469- 76. https://doi.org/10.1109/TDEI.2017.006270
- Liao R-J, Yang L-J, Li J, Grzybowski S. Aging condition assessment of transformer oil-paper insulation model based on partial discharge analysis. IEEE Transactions on Dielectrics and Electrical Insulation. 2011 Feb; 18(1):303- 11. https://doi.org/10.1109/TDEI.2011.5704522