| 摘要 |
<p>The present invention relates to a system and a method for fault protection primarily in Compact Secondary Substations (CSS), comprising a Ring Main Unit (RMU), a transformer and a Low Voltage Circuit Breaker (LV-CB), in which system the RMU comprises an arc protection circuit, which protection circuit by arc detection activates switches for grounding the high voltages power Lines. The object of the invention is to fault protect a secondary switch gear, a further object of the invention is in fault situations to bring the secondary switch gear back in operation as soon as possible. The objects can be fulfilled by a system where the CSS can comprise a number of detectors, which detectors can be placed at least in the RMU, the transformer or in the LV-CB, which detectors can be connected to a control unit, which control unit by fault detection can activate fast operating switches for grounding. By using the arc eliminator and control this arc eliminator on the basis of the detectors placed inside the CSS, an active arc fault protection is achieved. In order to avoid damage to the CSS and in fact to avoid direct explosions of the CSS which can be very critical if the CSS is placed in a populated area, it is necessary to reach a grounding of the high voltage inlet as fast as possible after a failure situation, e.g. if an arc is detected.</p> |
