The Assessment of the Overload Capacity of Transformer Based on the Temperature Reverse Extrapolation Method

Abstract:

The assessment of the overload capacity of transformer has a certain practical significance. In this paper, a temperature reverse extrapolation method is proposed to assess the overload capacity of transformer. Firstly, the top oil temperature is monitored by the online monitoring system. Secondly, the temperature distribution model and the calculation methods of hot spot temperature in the PTP7 (Power Transformers. Part 7: Loading guide for oil-immersed power transformers) guide are analyzed. Then, a new method called temperature reverse extrapolation which can calculate the overload factor of transformer is composed. And based on the overload factor, two meaningful data about overload capacity are obtained. Finally, an assessment system of transformer overload capacity based on the online monitoring is developed.

• Periodical: Advanced Materials Research (Volumes 860-863)
• Pages: 2153-2156
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.860-863.2153
• Online since: December 2013
• Authors: Wei Jia Liu, Xin Wang*, Yi Hui Zheng, Li Xue Li, Qing Shan Xu
• Keywords: Online Monitoring, Overload Capacity, Power Transformer, Temperature Reverse Extrapolation

References

[1] P.K. Sen: Understanding and Assessment of Transformer Over-loading Capability: An Application Guideline(American Power Conference, Chicago 1996) p.968.

[2] J. O'Grady: Power Engineering Journal, Vol. 5 (1990), p.87.

[3] B.D. Lahoti andD.E. Flowers: Power Apparatus and Systems, Vol. 4 (1981), p. (1989).

[4] Y.G. Bae, P. N. Adkins and D. W. Bree: Power Apparatus and Systems, Vol. 1 (1979), p.98.

[5] B. Shahbazi andM. Ashouri: A New Approach for Transformer Overloading Considering EconomicTerms (Power Engineering, 2007 Large Engineering Systems Conference, Montreal 2007) p.54.

DOI: 10.1109/lescpe.2007.4437352

[6] S. Tenbothlen, T. Stirl and M. Stach: Assessment of Overload Capacity of Power Transformers by On-line MonitoringSystem (IEEE Power Engineering Society Winter Meeting, Columbus, Ohio2001) p.329.

DOI: 10.1109/pesw.2001.917057

[7] KBMI Perera, JR Lucas and KKASD Kumarasinghe: Estimation of Optimum Transformer Capacity based on Load Curve (Transactions of IEEE Sri Lanka, Sri Lanka 2001).

[8] Jian Li, Xingpeng Liu, Youyuan Wang, Weigen Chen andZongquan Deng: Chinese Journal of High Voltage Engineering, Vol. 10 (2011), p.2344 (In Chinese).

[9] Zerong Liu: Chinese Journal of Transformer, Vol. 9 (2007), p.66 (In Chinese).

[10] YongjiGuo: Chinese Journal of Automation of electric power systems, Vol. 21 (2001), p.38 (In Chinese).