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Travelling wave based line protection has the advantage in fast response speed, however, its performance in practice is still unsatisfactory due to the high frequency limitation characteristic of coupling capacitor voltage transformer (CCVT). This paper presents a directional comparison protection principle based on travelling wave, which utilizes the polarities of high frequency current and low frequency...
Microgrid protection presents challenges because of the presence of inverter interfaced resources which results in insufficient separation between fault and load currents. This paper uses the Dynamic State Estimation (DSE) based protection (EBP) method for the protection of microgrid components. The paper demonstrates that this method provides a reliable protection system as opposed to traditional...
In this paper, a travelling wave-based fault location method for hybrid three-terminal transmission systems, including offshore cables and an onshore overhead line, is proposed. Such systems are utilized for offshore wind farms interconnection. The receiving ends are equipped with optical transient recorders as well as Global Positioning System (GPS) signal receivers to measure synchronized transient...
The U.S. Navy is investigating use of medium-voltage direct current (MVDC) for shipboard electrical distribution. MVDC architecture has the possibility of fault detection and response that is faster than comparable AC (MVAC) systems. Theoretical MVDC response times are on the order of 1–5 µs. The feasibility of 5 µs for fault detection and mitigation in a shipboard MVDC system is evaluated analytically...
Directional elements need to be able to differentiate between load current and fault current when two sources are present in the distribution network (closed-loop). When the fault current is about two- or three-times the load current, this is easy to accomplish. But when the directional element is used in a relay that is protecting a distributed generator (DG) the fault and load current may be within...
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