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AssigneeABB Technology AG
InventorsCarsten Thrue, Henrik Breder, Leif Lundin
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A Compact Secondary Substation including a fault protection system and a method for fault protection in Compact Secondary Substations (CSS). The CSS includes a Ring Main Unit (RMU), a transformer and a Low Voltage (LV) switchgear. The CSS includes a number of detectors, which detectors can be placed at least in one of the RMU, the transformer or in the LV switchgear, which detectors can be connected to a control unit, which control unit by fault detection by the detectors can activate a fast operating switch for grounding. By using the fast operating grounding switch and controlling this on the basis of the detectors placed inside the CSS, an active arc fault protection is achieved. The control unit also controls the fast operating grounding switch so that it works as a working grounding switch.
A Compact Secondary Substation (CSS) comprising a fault protection system, which CSS comprises a Ring Main Unit (RMU) with high voltage power lines, a transformer and a low voltage (LV) switchgear, characterized in that the CSS comprises a number of detectors that detect the occurrence of an arc fault, which detectors are placed at least in one of the RMU, the transformer or the LV switchgear, that the CSS comprises a control unit and the detectors are connected to the control unit, and that the CSS comprises at least one fast operating switch for grounding, which control unit upon arc fault detection by the detectors activates the fast operating switch for grounding, thereby grounding at least one of the high voltage power lines, and which control unit can also control the fast operating switch as a working grounding switch.
A method for fault protection in a Compact Secondary Substation (CSS), which CSS comprises a Ring Main Unit (RMU) with high voltage power lines, a transformer and a low voltage (LV) switchgear, characterized in
Dependencies are inferred from the claim text.