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The transient transmission error of Capacitor Voltage Transformer (CVT) may cause the incorrect action of relay protection. A Novel correcting method for transient error of CVT is proposed. Using this method, CVT's primary side voltage can be calculated accurately with the secondary side voltage known. The node voltage equations based on integral equivalence is used to simplify the computation of...
This paper investigates the relationship between post fault transient overvoltages and the functionality of the numerical distance protection. The study is conducted on a 66kV network with a neutral earth resistor as method to earth the power system.
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...
The chief advantage that the distance relay has over current-only based line protection schemes is its ability to provide a defined zone of protection without the need for a communications channel - a so-called direct tripping, under-reaching zone. This zone must operate for faults within its zone of coverage with no appreciable time delay and restrain itself for all faults beyond its reach. It must...
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