| 摘要 |
The invention relates to a fault current limiter in which a resistor is inserted by means of a running arc (11). The arc is allowed to burn in a commutating unit (8) until the current zero-passage. Upon the passage through zero the arc is extinguished and the current is commutated to a shunt resistor. The commutating unit comprises a gap-formed nozzle (16), in which the arc is burning. The nozzle is defined by two nozzle halves (14, 15) of a material which gives off gas under the influence of the arc. Close to the nozzle inlet is a pressure generating chamber (17), in which an overpressure is built up during the arcing time. After current zero-passage, the hot arc residues are effectively vented by means of the overpressure in the pressure generating chamber. For cooling the gas in the chamber and for guiding the gas flow, the chamber is divided into small sub-volumes (18) defined by metal plates (19). |
