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Proposed a morphological filter and wavelet transform combined method for super high-speed fault phase selection. In this method, the amount of the fault phase transformation by Karen Bell fault components into modules. And then strike the wavelet transform modulus maxima modulus, and finally according to characteristics of modulus maximum modulus construct a new component fault phase. The selector...
The neutral point in medium voltage distribution system is mainly non-effectively earthed in China. The important characteristics of this system are the fault-phase voltage decreasing and the un-fault-phase voltage increasing when SLG (Single-Line-to-Ground) fault happened. Due to the existing of line capacitance, the transient progress of un-fault-phase voltage increasing can be regard as a charge...
The paper proposes a new method of fault transient signal singularity detection by wavelet transform, analyzes the main drawbacks of present starting algorithms which use only adjacent scale of WTMM of WTMS ratio to determine the Lipschitz coefficients, presents a new method for estimating Lipschitz coefficients based on least square method by fitting the data of various scales. ATP-EMTP simulation...
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