Electrical protective device and method for selective disconnection of a subsystem in case of a second fault in an IT power supply system
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United States of America Patent
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Mar 27, 2018
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Nov 13, 2015
filing date -
Nov 14, 2014
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Abstract
An electrical protective device (20) and method are for selective disconnection of a subsystem (6a, 6b) in the event of a second fault in an ungrounded power supply system (2) with a main system (4) and at least one subsystem (6a, 6b), the subsystem (6a, 6b) having a differential current measuring device (12a, 12b) and a switching device (14a, 14b) for separating the subsystem (6a, 6b). The invention is based on generating and applying a measuring signal voltage (Um) between one or more phase(s) of the main system (4) or from a neutral point of the main system (4) against ground (9) using a resonant coupling circuit (22) that has a measuring signal generator (24) and a series resonant circuit (26) connected in series to the measuring signal generator (24), a resonant frequency (f0AK) of the series resonant circuit (26) being set to correspond to the measuring signal frequency.
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