A Novel Flux-Based Protection Scheme for Power Transformers

Document Type : Research Article

Authors

1 Assistant Professor, Department of Electrical Eng, Abbaspour School of Engineering, Shahid Beheshti University, Tehran, Iran

2 M.Sc. Student, Department of Electrical Eng, Abbaspour School of Engineering, Shahid Beheshti University, Tehran, Iran

3 B.Sc. Student, Department of Electrical Eng, Abbaspour School of Engineering, Shahid Beheshti University, Tehran, Iran

Abstract

Internal Turn-Turn faults (TTF) are the most common failures in power transformers, which could
seriously reduce their life expectancy. Although common protection schemes such as current-based
differential protection are able to detect some of the internal faults, some other minor ones (such as TTFs and
short circuit near the neutral point) cannot be detected by such schemes. Likewise, these relays may have
false trip due to energizing inrush currents, transformer over excitation, and occurrence of CT saturation at
one side. In this paper, a novel Linkage Flux Based (LFB) scheme is proposed to detect TTF in power
transformers, which uses some Search Coils (SC) located on the transformer legs to sense the related linkage
flux. Any difference in induced voltage in the corresponding SCs (located on any leg) suggests passing
unsymmetrical linkage fluxes through them (unlike the normal conditions), which stands for the occurrence
of a fault inside the transformer. The proposed technique not only can be used to protect power transformers,
but also can be employed to find the fault location during repair activities, as well.

Keywords

References

[1]
Wu, Q. H., Lu, Z. and Ji, T.Y., “Protective relaying for power systems using mathematical morphology”, Springer, 2009.
[2]
H. Wang and K. L. Butler, “Modeling Transformer with Internal Winding Faults by Calculating Leakage Factors”, Proceeding of the 31th North American Power Symposium, San Luis Obispo, CA, USA, 1999.
[3]
González, D., Guzmán, J., Fernández, G.A. and Arboleya, P.A., “Diagnosis of a Turn-to-Turn Short Circuit in Power Transformers by Means of Zero Sequence Current Analysis”, Electric Power Systems Research 69, No. 2, pp. 321- 329, 2004.
[4]
Guzmán, A., Zocholl, S., Benmouyal, G. and et al., “A Current-based Solution for Transformer Differential Protection. Part I: Problem Statement”, IEEE Transactons on Power Delivery, Vol. 16, No. 4, pp. 485– 491, 2001.
[5]
Areva, T.D. “Network Protection & Automation Guide”, Flash Espace, Cayfosa, pp. 92- 95, 2002.
[6]
Babiy, M., Gokaraju, R., and Garcia, J.C., “Turn-to-Turn Fault Detection in Transformers Using Negative Sequence Currents”, IEEE Electrical Power and Energy Conference, 2011.
[7] Gajić, Z., Brnčić, I, Hillström, B. and Ivanković, I., “Sensitive Turn-to-Turn Fault Protection for Power Transformers”, CIGRÉ Study Committee B5 Colloquium, 2005.
[8]
Cabanas, M.F., Melero, M.G., Pedrayes, F., Rojas, C.H., and Orcajo, G.A., “A New Online Method Based on Leakage Flux Analysis for the Early Detection and Location of Insulating Failures in Power Transformers: Application to Remote Condition Monitoring”, IEEE Trans. Power Delivery, Vol. 22, No. 3, pp. 1591- 1602, 2007.
[9] Maxwell 2D field simulator, ANSOFT Corporation, February, 2002.
[10]
Lehner, G., “Electromagnetic Field Theory for Engineers and Physicists”, Springer, 2010
[11]
Chapman, S.J., “Electric Machinery Fundamentals”, New York: Mc-Grow-Hill.
[12]
Silvester, P.P. and Ferrari, R.L., “Finite Elements for Electrical Engineers”, Cambridge University Press, 1996.
[13]
Wang, H. and Butler, K.L., “Finite Element Analysis of Internal Winding Faults in Distribution Transformers”, IEEE Trans. Power Delivery, vol. 16, No. 3, pp. 422- 428, 2001.
[14]
Davenport, E.M., “Application of Finite Element Methods to the Modeling of Field Ingress to Structures”, Proceedings of International Conference on Computation in Electromagnetics, pp. 6– 9, 1991.
[15]
Zhou, P., McDermott, E.T., Cendes, Z.J., and Rahman, M. A., “Steady State Analysis of Synchronous Generators by a Couple Field-Circuit Method”, IEEE International Conference of Electric Machines and Drives, pp. 422- 428, WC2/2.1– WC2/2.3., 1997.

Files

Share

How to cite

Statistics