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This paper presents a new DC feeder protection based on wavelet transform. The model of two substation rectifiers in one track section has been proposed which is according to practical situation. The remote short-circuit current is determined mainly by the steel rail impedance, which is time varying due to the skin effect. In contrast, impedances of the traction motor and the contact wires, and the...
It is difficult for existing HVDC line protections to distinguish internal fault from external fault rapidly and accurately, and the protective setting work encounters problems and difficulties. As a result, these protections have a low correct action rate. According to the feature of HVDC transmission system, this paper studies the characteristics of the natural boundary composed of the smoothing...
A parallel line integrated protection technique based on transient current polarity comparison is presented. An integrated protection relay interfaced to both CTs of the parallel lines, is responsible for the protection of the parallel lines. The polarity ofthe transient current component which comes from the faulted direction on the transmission line is different from the one which comes from the...
A novel and effective technique for discriminating fault current from inrush current based on wavelet de-noising is presented in the paper. Internal fault current, external fault current and inrush current exhibit distinct characteristics through the detecting of fault skips. Based on these, a criterion which proved to provide to be reliable, fast, and computationally efficient has been developed...
This paper proposes a new current mode derived by a new modal transformation technique, the alpha mode. The mode is used to detect and distinguish between internal and external faults for power line protection, based on a new transient directional comparison technique using current alone. The technique uses the symmetrical component to replace Clark or Karrenbauer transformation to decouple the three...
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