Abstract
This research study presents a real time data analysis on the diagnostic tests of four different service transformers by using a statistical correlation technique. Transformers are essentially passive devices that supply desired voltage at a specified frequency. Transformer oil performs two different functions within all power transformers: insulation and cooling. The quality of the transformer oil depends on the performance of this continuously working equipment. Hence it is required to conduct a concurrent scheduled as well as unscheduled diagnostic tests. The proposed analysis has considered the dielectric strength or breakdown voltage, moisture or water content, acidity or neutralization number, interfacial tension along with dissolved gas analysis diagnostic tests. Here, the statistical analysis has been performed by using correlation tests and the final results predict the linear correlation among diagnostic tests.
References
- Heathcote, Martin J. The J & P transformer book: a practical technology of the power transformer. Newnes, 1998.
- Waldemar, Z. "Transformer electrical insulation." IEEE Trans. Dielectr. Electr. Insul 19, no. 6 (2012): 1841-1842.
- Harlow, J. H. "Electric power transformer engineering-Book Review." IEEE Electrical Insulation Magazine 20, no. 3 (2004): 64-64.
- Winders, John. Power transformers: principles and applications. CrC Press, 2002.
- Rouse, T. O. "Mineral insulating oil in transformers." IEEE Electrical Insulation Magazine 14, no. 3 (1998): 6-16.
- Arora, Ravindra, and Wolfgang Mosch. High voltage and electrical insulation engineering. John Wiley & Sons, 2022.
- Wetzer, Jos. "Transformer health and risk indexing: Transforming asset data into decision-support information." Transformers Magazine 5, no. 2 (2018): 74-79.
- Pasaribu, Rizky Auglius. "Thermal Aging of Mineral Oil-Paper Composite Insulation for High Voltage Transformer." International Journal on Electrical Engineering & Informatics 8, no. 4 (2016).
- Polanský, Radek, Pavel Hahn, Petr Kadlec, Daniela Moravcová, and Pavel Prosr. "Quantifying the effect of catalysts on the lifetime of transformer oil." Applied Sciences 10, no. 4 (2020): 1309.
- Bureau of Reclamation engineers, "Transformer Basics, Maintenance and diagnostics", Hydroelectric Research and Technical Services Group Denver, Colorado 2005.
- IS 335 (1993): "New insulating oils", Beaureu of Indian Standards, New Delhi, (Fourth Revision) Third Reprint, 1998.
- IS 1866 (2000): "Code of Practice for Electrical Maintenance and Supervision of Mineral Insulating Oil in Equipment", Beaureu of Indian Standards, New Delhi, (Third Revision), First Reprint April 2006.
- IEC: 60296 Fluids for electro technical applications – Unused mineral insulating oils for transformers and switchgear”, IEC 60296: 4th edition; IEC: Geneva, Switzerland, 2012.
- IEEE Power & Energy Society, IEEE Std C57.104-2008 "Guide for the Interpretation of Gases Generated in Oil-Immersed Transformers", New York: IEEE, 2 February 2009. https://www.mylittledga.com/ieeeguidelines.pdf
- ERDA: "ERDA’s Transformer Test Facility: Capability Profiles and Technical Notes", Electrical Research and Development Association, Vadodara – 390 010. Web: www.erda.org.
- Singpurwalla, Darius. "A handbook of statistics: An overview of statistical methods." (2013).
- Kothari, Chakravanti Rajagopalachari. Research methodology: Methods and techniques. New Age International, 2004.
- Singh, K. Y. "Fundamentals of research methodology and statistics, new age international (p) limited." New Delhi-110002 (2006).
- Stephanie Glen., "Correlation in Statistics: Correlation Analysis Explained" From StatisticsHowTo.com: Elementary Statistics for the rest of us! https://www.statisticshowto.com/probability-and-statistics/correlation-analysis/