Robust Differential Protection with Intermittent Cable Faults for Aircraft AC Generators



Published Mar 26, 2021
Ashraf Tantawy Xenofon Koutsoukos Gautam Biswas


Differential protection is a popular method to protect aircraft generators against winding faults. Traditional relay-based systems have a limited capability to distinguish between differential current resulting from a winding fault, and the one resulting from measurement noise or current saturation, resulting in false alarms and unnecessary equipment shutdown. Modern aircraft generators are monitored and controlled by advanced generator control units, and therefore, sophisticated signal processing algorithms can be implemented to enhance the differential protection performance. We propose and compare four different differential detector designs, based on the available information about measured currents, for detection of persistent, short circuit faults in the protected windings. Also, current sensors are subject to intermittent, open circuit, cable faults, resulting in degradation in the differential detection performance. We propose an optimal differential protection architecture, based on the Neyman-Pearson criterion, to detect winding short circuit faults in the presence of intermittent cable faults. In this architecture, the system switches between two different detectors, depending on the cable health state.

How to Cite

Tantawy, . A. ., Koutsoukos, X. ., & Biswas, G. . (2021). Robust Differential Protection with Intermittent Cable Faults for Aircraft AC Generators. Annual Conference of the PHM Society, 1(1). Retrieved from
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anomaly detection, detection, diagnosis, electronic equipment, electronic systems, fault detection, fault diagnosis, fault tolerance, fault-tolerant control, PHM system design and engineering, applications: electronics

(Antoniou, 2000) Andreas Antoniou. Digital Filters, Analysis, Design, and Applications. McGraw-Hill, 2nd edition, 2000.
(Batzel and Swanson, 2009) T.D. Batzel and D.C. Swanson. Prognostic health management of air- craft power generators. IEEE Transactions on Aerospace and Electronic Systems, 45(2):473–482, April 2009.
(Breingan et al., Oct 1988) W.D. Breingan, C.H. Cas- tro, J.R. Latham, J. Mescua, A.G. Phadke, J.M. Postforoosh, E.O. Schweitzer, W.M. Strang, F.Y. Tajaddodi, and E.A. Udren. Survey of experience with generator protection and prospects for im- provements using digital computers. IEEE Trans- actions on Power Delivery, 3(4):1511–1522, Oct 1988.
(GmbH, 2007) Woodward GmbH. Esdr 4 current dif- ferential protection relay, manual 37137b. Techni- cal report, Woodward, 2007.
(Kay, 1998) Steven M. Kay. Fundamentals of Statis- tical Signal Processing, Volume 2: Detection The- ory. Prentice Hall Signal Processing Series. Pren- tice Hall PTR, 1998.
(Krause et al., 2002) Paul C. Krause, Oleg Wasynczuk, and Scott D. Sudhoff. Analysis of Electric Machinery and Drive Systems. IEEE Press Power Engineering Series, Piscataway, NJ, 2002.
(Sottile et al., 2006) J. Sottile, F.C. Trutt, and A.W. Leedy. Condition monitoring of brushless three- phase synchronous generators with stator winding or rotor circuit deterioration. IEEE Transactions on Industry Applications, 42(5):1209–1215, Sept.-Oct. 2006.
(Tantawy et al., 2008) Ashraf Tantawy, Xenofon Koutsoukos, and Gautam Biswas. Aircraft ac generators: Hybrid system modeling and simulation. International Conference on Prognostics and Health Management, 2008.
(Tantawy et al., 2009) Ashraf Tantawy, Koutsoukos, and Gautam Biswas. Xenofon
performance for detection systems in wireless passive sensor networks. 17th Mediterranean Conference on Control and Automation, MED’09, Thessaloniki, Greece, 2009. To appear.
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