nProtective devices play an important role in low-voltage power distribution systems. nMain devices for protecting distribution lines against faults - low-voltage fuses and low-voltage circuit breakers. nCorrectly select and set parameters of electrical devices. *National standard - \"Code for Design of Low-Voltage Power Distribution\" (GB 50054-95); *According to the status of the distribution system and the calculated fault current value (short-circuit current and ground fault current, etc.) *Correctly set parameters of protective devices *Selectively cut off the fault, that is, only cut off the section of the circuit where the fault occurs, without cutting off the upper distribution line.
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