This paper will investigate the effect of digital filtering on the operating time of a generic digital distance relay. Two popular filtering approaches will be considered: the Cosine Filter and the Fourier Filter. The effects of several variables, such as sampling rate, fault location, fault incidence angle, and non-fundamental frequencies, will be discussed. This paper will attempt to discuss ...

A Fano Factor-based adaptive overcurrent protection scheme, that automatically adjusts the settings in response to prevailing conditions of power system, is presented. Both phase and ground relays are based on same mathematical algorithm calculate operating time using Factors (FFs) estimated for current signals, respectively. Effectiveness proposed method validated various fault types under a p...

In this paper, an interval approach is presented to achieve perfect selectivity and maximum sensitivity in distance relay zones, considering uncertainties. For this purpose, first, the uncertainties affecting the settings of the three zones of a distance relay are discussed. Then, by using the Monte-Carlo simulation, the uncertainties are modelled and the impedances seen by the distance relay a...

This paper studies optimal power allocation to minimize symbol error rate (SER) of amplify-and-forward cooperative diversity networks. First, we analytically solve optimal power allocation problem to minimize SER for three different scenarios, namely, multi-branch single-relay, single-branch multi-relay and multi-branch multi-relay cooperative diversity networks, all subject to a given total re...

Exact closed-form outage probability (OP) expressions are presented for multiplemobile relay-based mobile-to-mobile (M2M) systems with threshold digital relaying (TDR) and relay selection over N-Nakagami fading channels. Numerical simulation is used to verify the accuracy of the analytic results. The effect of the fading coefficient, the number of cascaded components, the relative geometric gai...

Relay networks and cooperative transmission have spurred considerable interest in recent years, promising performance improvements in, e.g., system capacity, robustness and transmission rate. In this thesis, the focus is on the so-called half-duplex relay channels, where in the system, a source node wants to transmit a message to a destination node and a relay node can potentially assist this t...

the design and application of a fuzzy logic based controller to a leakage current relay waspresented in this paper. a novel approach based on fuzzy logic to form the tripping action of leakagecurrent relay was investigated. in addition to the theoretical aspect of fuzzy logic, detection of a leakagecurrent, measurement of the leakage current, determination of its duration, trip opening of fault...