Distributed Generation (DG) is the production of electricity from a variety renewable energy sources that closer to customer and load. The addition distributed generation distribution networks alters characteristics system has an influence on its protection coordination. Relay plays critical function in protecting power various problems. coordination reduces relay operating time avoids failure....

This paper introduces a methodology for modelling digital admittance-type distance relay using PSCAD/EMTDC. The proposed was tested in simulation of the Brazilian power grid with predetermined fault scenarios. goal this is to make detailed evaluation mho relay. main aspects include correct operation relay, resistance effects on characteristics, and detection time A new approach analyse presente...

This paper concerns two-hop communication over relay-assisted Block fading channel. It is assumed there is not a direct link between the transmitter and the affiliated destination and the communication occurs in two hops through the use of a relay, where the amplify and forward (AF) strategy is employed at this node. In this case, in a Rayleigh block fading channel, the optimal weight function ...

Wireless multi-hop relay networks have become very significant technologies in mobile communications. These networks ensure data rate transfer and coverage extension with a low cost. In this study two types of relay are studied; Fixed Relay Node (FRN) and Moving Relay Node (MRN). Where system analyses for uplink and downlink transmission are derived in this study. Moreover the optimal relay loc...

The article examines the problem of saturation and failure of power transformers under geomagnetically induced currents and currents of the E3 component of high-altitude nuclear explosions. It also describes a special protective relay reacting on DC component in the transformer neutral current.

The use of a digital stopwatch as timer for the overcurrent relay is important in order to know operating time characteristics relay. This activity aims design and build prototype laboratory practice activities. equipment circuit was then made applied practical implementation MCGG52 type electrical engineering at Faculty Engineering, Atma Jaya University Makassar. record using successfully carr...

This paper describes Relay Assistant, a new Win95/NT software for automated open-loop transient testing of protective relays. The software is designed to complement and improve widely accepted methods and practices of the relay testing. By using Relay Assistant users will be able to combine portability of universal relay test sets with transient testing capabilities of modern power system simul...

Due to the recent popularization of digital broadcasting systems, selective contents broadcasting depending on users' preferences have attracted great attention. Although the server can deliver programs reflecting users' preferences, clients have to wait until their selected contents start playing. Conventional methods reduce the waiting time by producing an effective broadcast schedule. Althou...

This paper presents a new approach for the channel capacity calculation of a multi-relay multi-hop communication system. For the channel model based on Markov chains theory, the exact formula for the channel capacity, which is expressed as a function of packet error rate and number of relays, is derived. The expression of the overall packet error rate is derived in its closed form. The presente...

This paper presents the development of a novel digital relay automated evaluation program and its important aspects. The goal of relay’s test automation concept is to use the relay expert's time as efficiently as possible. It shall be the tool to increase the depth of testing while decreasing the testing time, allowing the expert to use his valuable time to eliminate possible errors in the prot...