Analysis of a Novel Arcing Fault Detection method via Adaline based Frequency Measurement with EMTP-ATP Ozgur KARACASU, M. Hakan HOCAOGLU Electronics Engineering Department Gebze Institute of Technology, Turkey Istanbul Cad. No:101 / P.O. Box 141 41400, Kocaeli, Turkey +90 (262) 605 24 17 karacasu@gyte.edu.tr Abstract - In this paper, an Adaline based frequency measurement technique is proposed as a method to improve the fault type classification performance of the single pole autoreclosers. The method is also able to identify secondary arc extinction time for the transient faults. Effectiveness of the proposed method is analysed using EMTP-ATP by varying fault locations and pre-fault loading conditions. The effects of the coupling capacitor voltage transformer and nonlinear arc model are also taken into account in the simulations. Results show that the method successfully distinguishes fault types and also determines extinction time of secondary arc in case of transient faults. The method is computationally less expensive when compared with other methods in the literature, thus, it is suitable for hardware implementation in real time applications. Keywords: Adaline, frequency measurement, adaptive single pole autorecloser, arcing fault, 1 Introduction It’s well known that, short circuits are one of the main causes of the service interruption and supply distortions of the power systems. More than 70% of the all faults in the HV Transmission Lines (TLs) are Single Line to Ground Faults (SLGFs). On the EHV and UHV TLs, this rate is increased to 90%, depending on increases the conductor spaces due to voltage level increase. Moreover, large majority of these faults are of a transient nature [1]. Lightning, contact by trees, conductor clash due to storm, weather conditions like snow, icing, humidity are the main causes of the transient faults. The faults in transient nature can be quickly cleared and transmission systems, generally, return to the normal service by the implementation of Single Pole Auto Recloser (SPAR) systems. SPAR provides an improvement in the overall operational service quality of the system. Despite of the many advantages, possibility of reclosing onto permanent faults and due to fixed or non-adaptive time intervals are the main disadvantages of the conventional SPAR systems. Since the conventional method lack of an intelligent decision making tool, reclosing onto permanent faults may occur and cause damages on the system equipment. Thermal and voltage stresses on the system may wear out the insulation and reduce the life expectancy of power system devices. Meanwhile, conventional fixed dead time, which is used in the present power system protection equipment like [2]; may also cause unnecessary delayed autoreclosing, if the fault quickly extinguishes. On the other hand, if autoreclosing is made before the transient fault clearance, conventional SPAR erroneously perceives the fault type as a permanent, due to reclosing onto a fault. That,