Available online at www.sciencedirect.com ScienceDirect Journal of Electrical Systems and Information Technology 2 (2015) 257–267 Fault identification in electrical power distribution system using combined discrete wavelet transform and fuzzy logic Majid Jamil, Rajveer Singh ∗ , Sanjeev Kumar Sharma Department of Electrical Engineering, Faculty of Engineering and Technology, Jamia Millia Islamia, New Delhi 110025, India Received 5 October 2014; received in revised form 1 March 2015; accepted 4 March 2015 Available online 21 September 2015 Abstract In this proposed work a fuzzy logic based algorithm using discrete wavelet transform is developed for identifying the various faults in the electrical distribution system for an unbalanced distribution electrical power system. This technique is capable to identify the ten different types of faults with negligible effect of variation in fault inception angle, loading and other parameters of the power distribution system. The proposed method is tested on IEEE 13 bus electrical distribution system and on an Indian scenario of distribution system. The current of respective three phases is used as input signal for fault identification and the results obtained from the proposed method are more than satisfactory. © 2015 The Authors. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). Keywords: Fault identification; Fuzzy logic; Discrete wavelet transform; Fault inception angle 1. Introduction Nowadays, distribution systems carry a large amount of power as compared to earlier era because of increase in per capital consumption of electricity. Any, change is not predicted in the present trend in near future and it will sustain for decades at least in India and in other developing countries. So, any disturbance in the power supply may lead to discontinuation of power supply and degradation in the power quality. Distribution system is the most vital component in terms of its effect on reliability, quality of service, cost of electricity and aesthetic impact on society. In any industrialized country, the distribution system delivers electricity literally everywhere taking power from different generating station to the end users. Two foremost things which are required for quick restoration of the faulty part are fault location and type of fault. Similarly, in digital distance protection system the appropriate operation of protective device and accurate classification of the fault are necessary (Grainger and Stevenson, 1994). ∗ Corresponding author. Tel.: +91 9911314742. E-mail addresses: majidjamil@hotmail.com (M. Jamil), rajeev dit@rediffmail.com (R. Singh), sanjeev.eck@gmail.com (S.K. Sharma). Peer review under the responsibility of Electronics Research Institute (ERI). http://dx.doi.org/10.1016/j.jesit.2015.03.015 2314-7172/© 2015 The Authors. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).