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This paper discusses the distance relay mal-operation in the case of installation of thyristor controlled series compensator (TCSC), one of the series connected flexible alternating current transmission system (FACTS) device, on the second circuit of a double circuit transmission line, considering its metal oxide varistor (MOV) operation. This is done by means of presenting the measured impedance...
Thh paper discusses a distance relay mal-operation in the presence of Static Synchronous Series Compensator (SSSC), one of the series connected Flexible Alternating Current Transmission System (FACTS) devices, in the case of inter phase, phase to phase and three phase, faults. This is done by presenting the measured impedance at the relaying point in the presence of SSSC at the near end of the line...
This paper discusses the maximum fault resistance, which can be tolerated by a distance relay with Mho characteristic in the case of inter phase, phase to phase and three phase, faults. This is defined as the boundary fault resistance, that in the case of the lower fault resistances, the relay can discriminate between in-zone and out-of-zone faults satisfactorily. The robustness criterion is defined...
This paper discusses the distance relay mal-operation in the presence of static synchronous series compensator (SSSC), one of the series connected Flexible Alternating Current Transmission System (FACTS) device. This is done by presenting the measured impedance at the relaying point in the case of SSSC presence at the near end of the line behind. Measured impedance by distance relay is greatly influenced...
Distance relays are widely used as the main and back-up protection for transmission lines. They operate based on measured impedance at the relaying point, which is affected by several factors including pre-fault line loading and short circuit levels at the line ends. Introduction of Flexible Alternating Current Transmission System (FACTS) devices imposes further changes on the measured impedance at...
Advancements in telecommunication technology have opened up new horizons in power system protection such as wide area protection. In this protection data collected at busbars of power system are transmitted to a control centre where a backup protection is provided to prevent blackouts. This paper proposes a technique for speeding up the protection while maintaining its integrity. Based on the fact...
This paper presents the measured impedance at the relaying point in the presence of static synchronous compensator (STATCOM), a shunt connected flexible alternating current transmission system (FACTS) device, on a double circuit transmission line. The presence of STATCOM on a line has a great influence on the measured impedance by distance relays. The measured impedance by a distance relay itself...
Active power differential protection has recently been proposed as a novel technique to increase the protection reliability of transmission lines and busbars. In comparison with current differential protection, it is more reliable, faster, needs less input parameters and communication devices; those make it suitable to be used as a protection scheme of the wide area backup protection. On the other...
This paper presents the effects of thyristor controlled series compensator (TCSC), one of the series connected flexible alternating current transmission system (FACTS) devices, on the measured impedance at the relaying point for faults on a double circuit transmission line in the case of inter phase, phase to phase and three phase, faults. The measured impedance at the relaying point is affected by...
This paper discusses the distance relay over-reaching in the presence of Unified Power Flow Controller (UPFC), one of Flexible Alternating Current Transmission System (FACTS) devices, on the far end of the second circuit of a double circuit transmission line. This is done by presenting the measured impedance at the relaying point and the ideal tripping characteristic. The measured impedance at relaying...
This paper presents the measured impedance at the relaying point in the presence of static synchronous series compensator (SSSC), one of the series connected flexible alternating current transmission system (FACTS) devices, in the case of inter phase, phase to phase and three phase, faults. The presence of SSSC on a transmission line has a great influence on the measured impedance at the relaying...
This paper discusses the maximum fault resistance, which can be tolerated by a distance relay with Mho characteristic applied at the source node of a distribution feeder, in the case of inter phase, phase to phase and three phase, faults. This resistance is defined as the boundary fault resistance which is the boundary of the distance relay correct discrimination between in-zone and out-of-zone faults...
This paper presents an investigation on influence of the control system high pass filter characteristics on the performance of the shunt hybrid power filter. The power filter is consisting of a shunt passive filter connected in series with an active power filter. Frequency response of the shunt hybrid power filter, tacking into account the effect of high pass filter (used in control system for extracting...
Distance protection is not utilized in distribution networks, unlike the transmission systems, due to the inherent characteristic of the distribution networks and the additional required facilities of the distance protection, compared with over-current protection, which is in use in the distribution systems. This paper studies the measured impedance at the source node of a distribution feeder in the...
Current differential based wide area protection (WAP) has recently been proposed as a technique to increase the reliability of protection systems. It increases system stability and can prevent large contingencies such as cascading outages and blackouts. This paper describes how power differential protection (PDP) can be used within a WAP and shows that the algorithm operates correctly for all types...
This paper discusses the variation of distance relay robustness criterion as a function of Mho characteristic shifting angle as well as power system conditions. Boundary fault resistance is the maximum tolerable fault resistance which distance relay can discriminate between in-zone and out-of-zone faults. The robustness criterion is defined on the basis of the boundary fault resistance. In order to...
Fault resistance is a source of error for distance relays by the means of deviating the measured impedance from its actual value. The presence of the fault resistance not only leads to measured resistance deviation, but also the measured reactance deviates from its actual value. This would lead to both under-reaching and over-reaching. This paper investigates the over-reaching aspect by defining an...
In this paper a short circuit analysis algorithm for radial three-phase distribution networks, based on two relationship matrices method, is presented. Two relationship matrices, the bus-current-injection-to-branch current matrix and the bus-current-to-bus-voltage matrix are used to represent the special topological characteristics of distribution networks. These two matrices can be accomplished by...
This paper presents a fast approach for the reliability assessment of complex radial distribution systems. In this technique, using the shortest path from any node to the system energy source, the type and location of protection/isolating device of each load point and each component are identified. Then, based on the type and respective location of the devices to each other, reliability evaluation...
Distance relays are one of the mostly used protective devices in the transmission systems. These relays are used as the main, First zone and a part of second zone, and the backup, the rest of second zone and third zone, protective devices. Fault resistance is a source of error for distance relays in the form of the measured impedance deviation from its actual value. This paper investigates the measured...
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