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In this paper the performance of a new fault component impedance distance relay based on voltage amplitude comparison is evaluated and its capability to mitigate the impact of UPFC on the apparent impedance measured by the relay is analyzed. As the impact of shunt branch of UPFC on the apparent impedance is mainly due to the fault resistance; thereby the proposed relay can perform better than the...
With the increasing connections of generation using power electronics and transmission network capacity using embedded FACST devices, the measurement of higher than 50th voltage harmonics is of growing importance. This paper presents how to use the recent proposed Power Quality Sensor (PQSensor) adding onto the existing Capacitor Voltage Transformer (CVT) infrastructure to measure high orders of voltage...
Underground distribution cables are usually characterized with different technical difficulties regarding detecting and locating their faults. Different factors participate into these difficulties including their remarkable charging currents, cable construction and variations of their equivalency resulted from the variety of bonding and grounding methodologies. In this paper, a new fault location...
The goal of this paper is to coordinate directional overcurrent relays using the Evolutionary Particle Swarm Optimization (EPSO) Algorithm. EPSO Algorithm has gained a lot of interest for its simplicity, robustness and easy implementation. Coordinate directional overcurrent relays on a meshed network deals with a large volume of data, with many calculations and constraints. So that, this work shows...
LV networks have always their own difficulties regarding fault detection and location methods as compared with either MV or LV ones. Among these problems, detecting and locating high impedance faults still represent the most challenging problem. Load types as well as load variations may play a remarkable role for profiling the harmonic contents of voltage and current signals during faulty and non-faulty...
Increasingly, communications has become a significant component in modern power systems. The recently introduced standard IEC61850, describes the concepts for sub-station communications covering protection, control and metering functions. Not only is this is going to have a major impact on the power systems communications but it will also influence the design of future protection systems. The concepts...
The protection system design in common MV and LV distribution networks is determined by a passive paradigm, i.e. no generation is expected in the network. With distributed sources, the networks get active and conventional protection turns out to be unsuitable. In most cases, the issue is investigated with synchronous generators, while other generator types like Doubly Fed Induction Generators (DFIG)...
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