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This paper presents results of comprehensive tests of 18 different on-board electric vehicle battery chargers (EVBCs), representing the majority of currently available passenger-car-type EVs in the European market. The presented analysis compares the harmonic characteristics of EVBCs, concentrating on the impact of variations in supply voltage magnitude on emission of low frequency harmonics, as well...
In this paper, a combined power-current spectrum blocking for current differential protection of power transformer is proposed. The proposed algorithm can exclusively classify the internal faults associated with transformer inrush currents. This combination is assessed based on the individual analysis of differential power and power spectrum releasing functions and second harmonic current blocking...
The use of non-linear (solid state) loads in power system has increased the awareness of the potential reduction of a transformer life due to the increased losses. Manufacturers and users have been applying IEEE C57.110-1989 which gives a conservative estimate of loading capability of transformers. In this paper, the effect of harmonics on transformers is discussed and a thermal model to predict a...
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