SUMMARY Modelling of a high-impedance arcing fault due to a leaning tree in medium voltage (MV) networks was experimentally verified and the network transients due to this fault were also investigated. Even though the tree had a very high resistance value, the initial transients were periodically caused by the arc reignitions after each zero-crossing. In this paper, these features are extracted...

This paper studies the issues of apparent fault loop impedance seen by distance relays protecting a series compensated line with Series Capacitors (SCs) and their Metal-Oxide Varistors (MOVs) installed in the middle of the line. In this paper, SCs&MOVs schemes are equivalented for the fundamental frequency and taken into account in the measurement of the fault loop impedance. Two different appr...

This paper describes a new Expert System Based Software for Reduction of Sequence Networks. The main aim is to develop a new tool that helps students to reduce the corresponding sequence networks to its simplest form. Reduction of sequence networks is important for power system fault analysis. The equivalent positive-, negativeand zerosequences are represented as a series and series-parallel co...

The main objective of this paper is to show an importance of developing suitable experimental conditions while designing and utilizing model-based fault detection systems. In particular, the paper shows the possibilities of exploiting the theory of optimum experimental design in parameter-estimation-based fault detection schemes. More precisely, a novel scheme for measuring and diagnosing an im...

This paper addresses the problems encountered by conventional distance relays when protecting double-circuit transmission lines. The problems arise principally as a result of the mutual coupling between the two circuits under different fault conditions; this mutual coupling is highly nonlinear in nature. An adaptive protection scheme is proposed for such lines based on application of artificial...

technical and clinical particulars of these cases was then compiled, analyzed and discussed. Results: Amplitude aEEG traces were recorded from a total of 14 patients, 4 of whom were normal term or near term infants, and 10 were infants with a neurological abnormality. All records were of satisfactory quality, and all showed very high impedance levels. Five out of 11 neurologically-abnormal pati...

This paper presents an improved algorithm for fault detection and classification of transmission line fault current signals using MATLAB/SIMULINK. The proposed algorithm presents a fault discrimination method based on the three-phase current and voltage waveforms measured when fault events occur in the power transmission-line network. The algorithm for fault classification employs wavelet multi...

This paper presents a new distance relay technique for transmission line protection by using well known control technique; Adaptive Neuro-Fuzzy Inference System (ANFIS). The ANFIS can be viewed either as a fuzzy system, a neural network or fuzzy neural network FNN. The structure is seen as a neural network for training and a fuzzy viewpoint is utilized to gain insight into the system and to sim...