Effect of Radial and Axial Movement of Winding on Coherence Function in a 220/132 kV, 100 MVA, Auto Transformer

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Published Jun 17, 2014
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Volume 10, Issue 2, June 2014

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Shashidhar Reddy K.
St. Martin’s Engineering College, Dhulapally, Secunderabad-500014
Vishal Kulkarni
St. Martin’s Engineering College, Dhulapally, Secunderabad-500014
Suryakalavathi M.
Department of Electrical & Electronics Engineering, JNTU, Hyderabad-500 058
Singh B. P.
St. Martin’s Engineering College, Dhulapally, Secunderabad-500014

Abstract

The short circuit force generated in Powers Transformers due to system fault is known to cause movement of the windings. Several diagnostic methods have been employed to identify the movement of internal components of transformer e.g. Core, winding, coil bulging, coil twisting, Inter turn fault etc. The methods include – Sweep Frequency Response Analysis, Current reflection time, wavelet transform and Coherence Function (CF). The present work reports a detailed analysis of Coherence Function due to radial and axial movement of coil by theoretically simulating the HV winding of 220/132 kV, 100 MVA autotransformer. The results show a variation in magnitude of CF for dominant frequencies and that even a small change in radial or axial distances cause significant change in magnitude of CF. It is observed that sensitivity of detection of winding movement by CF for minor faults is moderately better than Frequency Response, since CF is related to the amount of linearity between input and output. It is observed that CF and FRA are complimentary to each other.

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How to Cite
K., S. R., Kulkarni, V., M., S., & B. P., S. (2014). Effect of Radial and Axial Movement of Winding on Coherence Function in a 220/132 kV, 100 MVA, Auto Transformer. Power Research - A Journal of CPRI, 295–300. Retrieved from https://cprijournal.in/index.php/pr/article/view/816

References

  1. P M Nirgude, B Gunasekaran, A D Rajkumar and B P Singh, “Investigations on Axial Displacement of Transformer Winding by Frequency Response Technique,” Proceedings of the XIVth International Symposium on High Voltage Engineering, Tsinghua University, China,Paper F-47,August 25-29, 2005.
  2. C Homagk, T Leibfried, K Mössner and F Fischer, “Circuit Design for Reproducible on-site Measurements of Transfer Function on Large Power Transformers using the SFRA Method,” presented at the ISH Conference, Ljubljana,T7-730 pp. 1-6 2007.
  3. L Satish and A Saravanakumar, “Identification of Terminal Connection and System Function for Sensitive Frequency Response Measurement on Transformers,” IEEE Transactions on Power Delivery, vol. 23, No.2, pp. 742-750, 2008.
  4. S D Mitchell and J S Welsh, “Modelling of Power Ttransformer to Support the Interpretation of Frequency Response analysis,” IEEE Trans.on Power Delivery Vol 26 No 4, pp 2705-2717, Oct.2011.
  5. D M Sofian, Z D Wang, and S B Jaya singhe, “Frequency Response Analysis in Diagnosing Transformer Winding Movements – Fundamental Understandings,” Universities Power Engineering Conference, 2004.
  6. UPEC 2004. 39th International, vol.1, no., Vol. 1, 8-8, pp.138, 142, Sept. 2004.
  7. K S Reddy,P V V R Kumar, B P Singh and M.Suryakalavathi, “Coherence Function Method of Detection of Fault in a Power Transformer during Impulse Test,” 2011 International Conference on Power and Energy Systems, ICPS 22-24 Dec. 2011
  8. K Shashidhar Reddy, B P Singh and M Suryakalavathi, “Analysis of Simulated Partial Discharges in a High Voltage Transformer by Coherence Function,” 2013 IEEE International Conference on Smart Structures and Systems (ICSSS) 28-29 March 2013.
  9. G M Kennedy A J McGrail and A J Lapworth.n,“Cross-correlation Coefficients to Analyze Transformer Sweep Frequency Response Analysis (SFRA) traces,” IEEE Power Engineering Society Conference and Exposition in Africa, PowerAfrica PESAFR , 2007.
  10. L Coffeen, B Jeffrey, and J Rickmann, “A Few Technique to Detect Winding Displacements in Power Transformers using Frequency Response Analysis,” IEEE Power Tech Conference, Bologna,Itlay ,June 23rd -26th , 2003.
  11. K.Shashidhar Reddy, B P Singh, B N Shashank, and M.Suryakalavathi, “Analysis of Simulated Partial Discharge in a High Voltage Transformer by Coherence Function,” IEEE International Conference on Smart Structures and Systems(ICSSS) Chennai, March 28 & 29th, pp 13-18, 2013.
  12. K Shashidhar Reddy 1, B N Shashank, VV Kulkarni, B P Singh and M Suryakalavathi, “Coherence Function and FFT Analysis of Theoretically Simulated Partial Discharge Current in a Transformer during Impulse test,” 8th International Symposium on HVE, Seoul, Korea August 25-30, pp 561565,2013.
  13. S C Gupta and B P Singh, “Determination of the Impulse Voltage Distribution in Windings of large power transformers,” Electric Power System Research, vol.25, No 3, pp.186-189, 1992.