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AssigneeBender GmbH & Co. KG
InventorsJulian Reitz, Karl Schepp
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The invention relates to a current return channel (20) and a method for the use of a residual current device (4) with a differential current sensor (8) in an ungrounded DC power supply system (2) in which the current return channel (20) is used. The current return channel (20) consists of an electronic circuit (22) which is coupled between each one of the active conductors (DC+, DC−) of the ungrounded power supply system (2) and ground (PE) via two terminals and is configured to be automatically activated temporarily when a low-resistance insulation fault (1) appears momentarily intermittently in order to form a fault circuit in which a current-limited fault current (If) flows, which triggers the residual current device (4).
A current return channel (20) for the use of a residual current device (4) with a differential current sensor (8) in an ungrounded DC power supply system (2) having active conductors (DC+, DC−), the current return channel (20) consisting of an electronic circuit (22) which is coupled between one of each of the active conductors (DC+, DC−) and ground (PE) via two terminals and is configured to be automatically activated temporarily when a low-resistance insulation fault (1) appears momentarily intermittently in order to form a fault circuit in which a current-limited fault current (If) flows, which triggers the residual current device (4).
A method for the use of a residual current device (4) with a differential current sensor (8) in an ungrounded DC power supply system (2) having active conductors (DC+, DC−), the method comprising the step of automatically activating a current return channel (20) temporarily which consists of an electronic circuit (22) which is coupled between one of each of the active conductors (DC+, DC−) and ground via two terminals when a low-resistance insulation fault (1) appears momentarily intermittently in order to form a fault circuit in which a current-limited fault current (If) flows, which triggers the residual current device (4).
Dependencies are inferred from the claim text.