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The real-time compression of the remote sensing image is one of a problem in urgent need of satellite remote sensing technology, the development of the compression method suitable for real-time remote sensing image has an important theoretical and practical value. In response to this problem, a fast compression method which is fit for remote sensing image is designed based on the features of decomposed...
To avoid the adverse effect of current transform (CT) transient saturation, this paper studies a novel bus protection based on transient current traveling-waves. Firstly the paper presents the differential traveling-wave (DTW) for each phase of circuits connected to the protected bus. The DTW fault features are analyzed. Then in order to distinguish more sensitively between faults internal and external...
To minimize insecurity and instability of rapid developing power systems, the ultra-high-speed protection schemes are demanded. However, the application of the ultra-high-speed protection techniques suffers relatively low reliability and feasibility by its limitations such as lack of effective signal processing tools. The advent of the wavelet transform (WT) method, which possesses capabilities of...
This paper presents the discriminative criterions of the boundary protection for EHV transmission lines. The boundary protection relay consists of three parts, the start unit, the direction unit and the boundary unit. The fault discriminative criterions of the relay are based on the single-ended transient information extracted by the wavelet transform. The tests using EMTP simulations and recorded...
This paper proposes a novel ultra-high-speed directional protection scheme for EHV transmission lines using the wavelet transform. The wavelet transform technique extracts high-frequency transient components from two composite relaying signals, forward and backward traveling-waves, which are derived from the fault-induced voltage and current wave propagating along transmission lines and the wavelet...
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