Overcurrent relay; Coordination; Fault current limiter; Optimization Abstract This paper addresses the problem of overcurrent relays (OCRs) coordination in the presence of DGs. OCRs are optimally set to work in a coordinated manner to isolate faults with minimal impacts on customers. The penetration of DGs into the power system changes the fault current levels seen by the OCRs. This can deterio...

When a fault occurs on the transmission line, relay should send faulty signal to circuit breaker trip or isolate line. Timely detection is integral protection and management of lines in power systems. This paper focuses using threshold current voltage reduce time delay instantaneous overcurrent for 330 kV The wavelet transforms toolbox from MATLAB Simulink model were used design detect value co...

Performance testing of the protection relays ensures that a particular protection scheme will operate reliably and fast enough to disconnect a faulty zone from the rest of the network, thus mitigating the effect of fault on the power system. It is therefore important to validate the settings of power protection equipment and to confirm its performance when subject to different fault conditions....

Abstract The present study is focussed on solving the relay coordination problem. Protection of microgrids performed through placement directional overcurrent relays (DOCR). efficacy microgrid protection depends all DOCRs placed in system. For this purpose, a number optimization techniques have been employed by power system researcher. In paper, Grey Wolf Optimizer (GWO) proposed for different ...

This paper proposes the new adaptive protection algorithm for inverse-time overcurrent relays (OCRs) to ensure their proper operating time and protective coordination. The application of the proposed algorithm requires digital protection relays with microcontroller and memory. The operating parameters of digital OCRs are adjusted based on the available data whenever system conditions (system wi...

Electricity is delivered to end users through generation, transmission, and distribution phases. The most important issues during energy journey provide selective, rapid, safe protection ensure continuity. In this context, when the operating conditions defined in systems are exceeded, an effective system coordination required that as few consumers possible affected by outage reliably isolate fa...

1 Department of Electrical Engineering, St. John’s University, 499, Section 4, TamKing Road, Tamsui District, New Taipei 25135, Taiwan 2Department of Computer Science and Information Engineering, St. John’s University, 499, Section 4, Tam King Road, Tamsui District, New Taipei 25135, Taiwan 3 Graduate Institute of Computer and Communication Engineering, National Taipei University of Technology,...

In recent years there has been an intensive effort to increase the participation of renewable sources of electricity in the fuel and energy balance of many countries. In particular, this relates to the power of wind farms attached to the power system at both the distribution network. However, in the presence of Renewable Dispersed Generation, (RDG) some problems in coordination of protection de...