Case Studies-Health Monitoring of Power Transmission Equipment Using Insulating Oil Analytical Methods

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Published Dec 30, 2017
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Volume 13, Issue 4, December 2017

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Shruti Tiwari
POWERGRID Corporation of India Ltd, WR-I, STL Raipur
Vijay Srivasatava
POWERGRID Corporation of India Ltd, WR-I,AM Nagpur
P. R. S. Yadav
POWERGRID Corporation of India Ltd, AM, CC, Gurugram
Kuleshwar Sahu
POWERGRID Corporation of India Ltd, WR-I,AM Nagpur

Abstract

This paper presents cases which are encountered during routine monitoring of oil DGA for the 400 kV class and 765 kV class equipments (transformers and reactors). Fault detection of the four equipments was conducted based the DGA and equipment were then subjected to preventive actions.Using Dissolved Gas Analysis excess values of C2H2 gas were reported for 1st case and preventive actions were taken. The equipment is being monitored further. In 2nd case, a rapid rise in H2 gas content was observed and the improper processing during the past oil filling activity were then ractified. In 3rd case the equipment suddenly tripped with loud sound and the existence of high energy electrical fault were evident in DGA as well as site inspection. Fault had happened because of gradual weakening of phase – phase insulation inside the main tank up to approximately 45 kA of fault current. In the 4th case, Duval Pentagon Analysis showed the system continuously in thermal fault zone Upon inspection severe damages were observed in lead insulation, copper of neutral lead, wooden turret CT supports and neutral turret CT insulation. For the 5th case high energy discharge observed in DGA was confirmed with diverter switch inspection.

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How to Cite
Tiwari, S., Srivasatava, V., Yadav, P. R. S., & Sahu, K. (2017). Case Studies-Health Monitoring of Power Transmission Equipment Using Insulating Oil Analytical Methods. Power Research - A Journal of CPRI, 593–600. Retrieved from https://node6473.myfcloud.com/~geosocin/CPRI/index.php/pr/article/view/1024

References

  1. POWERGRID CORPORATION OF INDIA LIMITED, “Procedure of DGA Interpretation in POWERGRID”, Doc: D204-06-01-01, 2007, PP 1-14.
  2. Standard Test Method for Analysis of Gases Dissolved in Electrical Insulating Oil by Gas Chromatography, ASTM 3612 (02), 2012.
  3. Rohit Arora, Different DGA Techniques for Monitoring of Transformers, “International Journal of Electronics and Electrical Engineering”, Vol. 1, No. 4, December, 2013
  4. M. Wang, A. J. Vandermaar, K. D. Srivasatava, “Review of Condition Assessment of Power Transmission in Services, IEEE Electrical Insulation Magzene, Vol. 18, No. 6, 2002
  5. Oil-filled electrical equipment – Sampling of gases and analysis of free and dissolved gases – Guidance IEC 60567-ed-4.0, 201110
  6. R. R. Rogers, "Concepts used in the development of the IEEE and IEC codes for the interpretation of incipient faults in power transformers by dissolved gas in oil analysis," IEEE Transactions on Electrical Insulation, Technical Report, Central Electricity Generating Board, Transmission Development and Construction Division, Guilford, vol. EI-13, no. 5, pp. 349-354, 1978.
  7. M. Duval, “The Duval triangle for load tap changers, non-mineral oils and low temperature faults in transformers,” IEEE Electrical Insulation Magazine, vol. 24, no. 6, 2008.
  8. Michel Duval, Laurent Lamarre, IEEE Electrical Insulation Magazine, Volume: 30, Issue: 6, November-December 2014, PP 9-12
  9. Biographical Information:
  10. “Shruti Tiwari received B.E. in Metallurgical Engineering department of National Institute of Technology in 2003. She holds M. Tech. from Indian Institute of Technology Kanpur (year 2003-2005) and PhD in “Corrosion of Advanced Materials” from University of Hawaii at Manoa (year 2006-2013), Honolulu, USA. She joined Power Grid Corporation of India Ltd. in year 2016. She is currently involved oil testing laboratory work. Her area of interest includes electrical insulation, failure analyses, materials, and corrosion.”
  11. “Vijay Srivastava received B. Tech Degree in Electrical Engineering from NIT Surat in 2003. He was involved in commissioning and Asset Management of POWERGRID’s first 765 kV Substation at Seoni (MP) between 2004 to 2012 and is presently working with POWERGRID Corporation Nagpur. His area of interest include Power System, Sub Station Asset Management and Controlled Switching. He has presented technical paper in CIGRE 2014, Paris”
  12. “P. R. S. Yadav was born in Hyderabad, India, in 1972. He received the B. Tech. degree in Electrical and Electronics Engineering from Jawaharlal Nehru Technological University, Hyderabad, India, in 1995. Since 1997 he has been working with Power Grid Corporation of India Ltd.His areas of interest are power systems and electrical insulation.”
  13. “Kuleshwar Sahu received B. Tech Degree in Electrical Engineering department of National Institute of Technology in 1990 and Post Graduate Diploma in International Business operation from IGNOU in 2003. Since 1995 he has been working with Power Grid Corporation of India Ltd.He was involved in Construction and O&M, commissioning of EHV Transmission line substation and currently working in Regional Asset Management.