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This paper presents problems related to transient detection and monitoring in electric power systems. It consists of two parts. Firstly, a problem of frequency characteristic of real impulses is considered. Parameters of the selected transient and notching disturbances are determined after extracting disturbances by pass-band filters with various cut-off frequencies. Further, results of wavelet transform...
The paper presents the new instrumentation for power quality assessment, called the estimator–analyzer of power quality. It is consistent with the general idea of waveform parameters measurement set out in IEC Standard 61000-4-7, although it utilizes the authors’ original methods of measurement of power quality parameters. The applied methods and algorithms were described in the first part of the...
One of the most rarely discussed power quality disturbances are subharmonics - voltage components of frequency less than the fundamental one. They may appear in both land and in ship power systems. This work deals with the influence of voltage subharmonics on temperature-rise distribution in an induction cage machine. The results of experimental investigations are presented for a totally-enclosed,...
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