This paper describes the use of new methods of detecting faults in medium-voltage overhead lines built of covered conductors. The methods mainly address such faults as falling of a conductor, contacting a conductor with a tree branch, or falling a tree branch across three phases of a medium-voltage conductor. These faults cannot be detected by current digital relay protection systems. Therefore, a new system that can detect the above mentioned faults was developed. After having tested its operation, the system has already been implemented to protect mediumvoltage overhead lines built of covered conductors.
 Agarwal, H.K., Mukherjee, K., Barna, P. (2014). Partially and fully insulated conductor systems for low and medium voltage overhead distribution lines. Condition Assessment Techniques in Electrical Systems (CATCON). IEEE 1st International Conference, 104 (6−8), 100−104.
 Hemmati, E., Shahrtash, S.M. (2012). Evaluation of shielded Rogowski coil for measuring partial discharge signals. Environment and Electrical Engineering (EEEIC), 11th International Conference, 446−450.
 Hemmati, E., Shahrtash, S.M. (2012). Evaluation of unshielded Rogowski coil for measuring partial discharge signals. Environment and Electrical Engineering (EEEIC), 11th International Conference, 434−439.
 Samimi, M.H., Mahari, A., Farahnakian, M.A., Mohseni, H. (2014). A Review on the Rogowski Coil Principles and Applications. Sensors Journal, IEEE, (99), 1, 1.
 Shafiq, M., Kutt, L., Lehtonen, M., Nieminen, T., Hashmi, M. (2013). Parameters Identification and Modeling of High-Frequency Current Transducer for Partial Discharge Measurements. Sensors Journal, IEEE, 13(3), 1081−1091.
 Nobrega, A.M., Martinez, M. L. B., de Queiroz, A.A.A. (2104). Analysis of the XLPE Insulation of Distribution Covered Conductors in Brazil. Journal of Materials Engineering and Performance, 23, 723−735.
 Misak, S., Hamacek, S. (2010). Utilization of the Finite Element Method For Optimizing of Overhead Covered Conductors. Conference DAAAM 2010, Austria, Vienna.
 Makhkamova, I., Taylor, P.C., Bumby, J.R., Mahkamov, K. (2208). CFD analysis of the thermal state of an overhead line conductor. Universities Power Engineering Conference, UPEC 2008. 43rd International, 1−4.
 Hamacek, S. (2012). Problems of Covered Conductors Running. PhD Thesis. VŠB-TUO: VŠB-Technical University of Ostrava.
 Hashmi, G.M., Lehtonen, M., Nordman, M. (2010). Modeling and Experimental Verification of On-line PD Detection in MV Covered-conductor Overhead Networks. IEEE Trans. Dielectr. Electr. Insul., 17, 167-180.
 Hashmi, G.M., Lehtonen, M., Ametani, A. (2010). Modeling and Experimental Verification of Covered-conductor for PD Detection in Overhead Distribution Networks. IEEJ Trans. Power Energy, 130(7), Sec. B, 670−678.
 Misak, S., Hamacek, S., Bilı́k, P., Horinek, M., Petvaldsky, P. (2011). Problems associated with covered conductor fault detection. Electrical Power Quality and Utilisation (EPQU), 2011 11th International Conference, 1−5.
 Hashmi, G.M., Lehtonen, M., Nordman, M. (2011). Calibration of on-line partial discharge measuring system using Rogowski coil in covered-conductor overhead distribution networks. Science, Measurement & Technology, IET, 5(1), 5−13.
 Hashmi, G.M., Lehtonen, M. (2010). Effects of Rogowski Coil and Covered-Conductor Parameters on the Performance of PD Measurements in Overhead Distribution Networks. Int. J. Innovations Energy Syst. Power, 4(2), 14-20.
 Sudha, G., Valluvan, K.R. (2014). A novel approach to fault diagnosis of transmission line with Rogowski coil. International Review of Electrical Engineering, 9(3), 656−662.
 Isa, M., Elkalashy, N.I., Lehtonen, M., Hashmi, G.M., Elmusrati, M.S. (2012). Multi-end correlation-based PD location technique for medium voltage covered-conductor lines. IEEE Transactions on Dielectrics and Electrical Insulation, 19(3), 6215097, 936−946.
 Misak, S., Pokorny, V. (2015).Testing of a covered conductor's fault detectors. IEEE Transactions on Power Delivery, 30(3), 6957620, 1096−1103.
 Hamacek, S., Misak, S. (2013). Fault indicators of partial discharges in medium-voltage systems. Advances in Electrical and Electronic Engineering, 11(4), 284−289.
 Zališ, K. (2005). Částečné výboje v izolačních systémech elektrických strojů. 1st. ed. Praha: Academia.