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Construction of UHV power grid is the fundamental guarantee to the growing demands of electricity in the future. Six phase transmission lines can evidently improve power transmission density, and many countries pay attention to it. A new method of fault location and phase selection on six-phase transmission lines was analyzed in this paper. The six sequence variables method to analyze the electrical...
Various principles and algorithms of the wide-area protection system (WAPS) have been developed so far. However, there are few discussions about the foundation in implementation of the WAPS (i.e., the corresponding communication system and its reliability). This paper presents a reliability evaluation method for the communication systems in wide-area protection (CSWAP). First, system structure and...
A new non-unit voltage protection algorithm for extra high voltage (EHV) transmission lines is presented in this paper. The singularity of fault transient voltage signals in one terminal is utilized to discriminate clearly between internal and external faults. Lipschitz exponent (LE) is obtained from wavelet modulus maximum to detect singularity of signals. A typical 500 kV EHV transmission system...
A new ultra high-speed protection scheme is proposed in this paper. Using wavelet transform with multiresolution analysis, the current signals is decomposed into a series of detailed wavelet components. The spectral energies of the wavelet components are calculated and then employed to detect the faults. Characteristics of the proposed ultra high-speed protection algorithm are analyzed and results...
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