In this paper preliminary and exemplary results are presented of voltage analysis on busbsrs of the main switchboard. Special atention was paid to voltage and its frequency deviation from their nominal values as well as to different voltage waveform distortions. The research cintains measurement results of two electrical power systems: of a ro-ro ship and ferry ship. The analysis was carried out offline on the basis of voltage samples from different states of ship exploitation. This analized electrical power systems and measurement devices are also described.
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