In this article, the effects of variable height in overhead power lines are investigated with reference to surges produced by direct and indirect lightning events. Simulations carried out both an implicit finite-difference time-domain scheme commercial tool EMTP-RV. Differences waveforms computed two approaches discussed clarified. Additionally, validity commonly adopted assumption weakly varyi...

Thefaults in the underground cables cause to generatetransients which propagate along power cable as travelling waves. The velocity of generated wave and time taken by a reach source point from fault location enables us calculate distance value.In this paper double endedtravelling based approach is used communication channel designed distance. A circuit-based model developed EMTP-RV software fi...

This paper contributes towards the establishment of a formal analysis method of control system equations solved through fixed-point iterations. The success of fixed-point iterations relies on contraction properties of the function to be iterated. A convergence criterion is presented and accuracy is not sacrificed over gain in computational time. The presented algorithms are illustrated in EMTP-...

The calculation of short-circuit currents is mostly based on the methodology of the international standards IEC-60909 and ANSI / IEEE C37.010.1979. This methodology, although it utilizes simple procedures and various assumptions, usually provides satisfactory results. However, dynamic tools such as the ATP/EMTP can be used for the accurate simulation of short-circuit currents. In this paper the...

Inrush currents in transformers are non-sinusoidal, high magnitude currents generated due to flux saturation in the core during energization. For protection purpose, in this paper an efficient method for detection of inrush current in distribution transformer based on wavelet transform is presented. Using this method inrush current can be discriminated from the other switching transients such a...

The paper presents a probabilistic fault arc reignition model for MV distribution networks. The model has been developed and implemented in the EMTP program, in order to evaluate the possible benefits of enlarging the time delay before the first fast reclosure, in terms of reducing the probability of fault reignition and, thus, avoiding longer interruptions. The application of the model in simu...

Overview of fault location techniques for HV (EHV) transmission lines as well as for distribution networks is presented. One-end and two-end fault location for traditional uncompensated transmission lines is considered first. The presented two-end fault location is based on unsynchronised measurements at the line terminals. Then the technique with phase co-ordinates approach is utilised for loc...