Article history: Received 28 September 2011 Received in revised form 6 January 2012 Accepted 5 February 2012 Available online 20 March 2012

The paper presents the results of constructing effective relay protection in power supply system a mining and processing plant (MPP). A brief description MPP is given, substitution circuits used to calculate short-circuit currents are given. statistical analysis failures electric network has been carried out, which makes it possible draw conclusions about nature ranges. Analysis registered faul...

in order to evaluate the effect of nitrogen absorption and use efficiency in relay intercropping for winter wheat and maize, a field experiment was conducted during 2008-2009 at the agricultural research station of ferdowsi university of mashhad, iran. a randomized block design with three replications was used. treatments included four combinations of relay intercropping of wheat and maize (thr...

Faults in the power system affect reliability, safety, and stability. Power-distribution systems are familiar with different faults that can damage overall performance of entire system, from which they need to be effectively cleared. Underground more complex require extra accuracy fault detection location for optimum management. Slow processing unavailability a protection zone relay coordinatio...

This paper presents a novel impedance-based approach for out-of-step (OOS) protection of a synchronous generator. The most popular and commonly used approaches for detecting OOS conditions are based on the measurement of positive sequence impedance at relay location. However, FACTS devices change the measured impedance value and thus disrupt the performance of impedance-based relay function. In...

Polar codes, that have been recently introduced by Arikan, are one of the first codes that achieved the capacity for vast numerous channels and they also have low complexity in symmetric memoryless channels. Polar codes are constructed based on a phenomenon called channel polarization. This paper discusses relay channel polarization in order to achieve the capacity and show that if inputs of tw...

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...

Abstract—In this paper, the problem of secure transmission in two-hop amplify-and-forward (AF) systems with an untrusted relay is investigated. To prevent the untrusted relay from intercepting the source message and to achieve positive secrecy rate, the destination-based cooperative jamming (DBCJ) technique is used. In this method the destination sends an intended jamming signal to the relay. T...

The existing Overcurrent Protection Function (OCPF) of distribution systems is vulnerable to Multiple Feeder Faults (MFF), which involve at least two feeders simultaneously, leading the incoming feeder relay trip faster than faulted relays, although OCPF relays can be coordinated for all fault current values. In this case, connected power transformer are de-energized, even healthy ones, directl...