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Travelling Wave Fault Locators (TWFL) allow a higher precision in most cases than typical impedance based fault location methods. One of the major problems with it, is the measurement of the arrival times of Travelling Waves (TWs). In this paper, a new method to compute the difference of arrival times of the first wavefront is presented. The method is based on the telegrapher's equations. The paper...
The reactance method with fault resistance separation has been developed in order to determine the impedance of a fault loop as precisely as possible in a transmission or distribution power system line. This method has commonly been used for impedance calculation in the case of a single phase-to-earth fault in diverse power system protection applications. New developments in this area have shown that...
The reactance method with fault resistance separation has been developed in order to determine as precisely as possible the impedance of a fault loop in a transmission or distribution power system line. This method has commonly been used for impedance calculation in case of a single phase-to-earth fault in diverse power system protection applications. New developments in this area have shown that...
In this paper a novel impedance determination method for the phase-to-phase loops is described. This approach promises a better accuracy of the reactance calculation of the faulty loops. Thus, better selectivity and security in operation of the distance element applied for the protection of transmission and distribution lines is guaranteed. Moreover, with this new method the separation of the fault...
Protection relays play a very important role in network security. Both the network stability and energy availability depend to a great extent on algorithms and protection concepts. This paper presents a novel, very fast protection algorithm that is based on directional comparison. The algorithm is robust against many states and phenomena appearing in the network, e.g. load flow fluctuation, power...
In this paper the High-Speed-Distance Protection algorithm will be discussed. The principle of this novel function is based on the so called dynamic delta-quantities resulting from splitting the electrical circuit after a short circuit event by means of the superposition technique. Due to fact that the estimation of the fault localization takes place in a time domain, the algorithm presents a good...
This paper presents the experimental investigation of a fault localization algorithm in a network with compensated or isolated star-point grounding. The paper first discusses the theoretical background of the method and then the conclusions drawn from the discussion were tested using a complex network structure (NETOMAC®) with the support of models developed in MATLAB®. Finally, the complete method...
This article describes a class designation and an accuracy calculation procedure for merging unit systems. The accuracy error calculations for each part have been performed using simulation models. Additionally, the requirements for the merging unit that come from the usage of the digital protocol according to IEC61850-9-2 are described. Scenarios for testing a real merging unit and experimental results...
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