Quick arc extinguishing system and method for single-phase ground fault of low-current ground system
A single-phase grounding fault, low-current grounding technology, applied in emergency protection circuit devices, electrical components, circuit devices, etc. for limiting overcurrent/overvoltage, can solve problems such as non-fault phase arc overvoltage accidents, etc. The effect of avoiding slow control, preventing misoperation, and improving reliability and safety
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[0017] The single-phase ground fault rapid arc extinguishing system of the small current grounding system of the present invention is aimed at the 3kV-66kV small current grounding system. Such as figure 1 As shown, a grounding line selection device 1 is used, installed in the PT cabinet of the busbar, and the acquisition of the three-phase voltage and zero-sequence voltage of the busbar and the command transmission to the thyristor group driving device are completed through the cable; the thyristor group driving device is the same as the grounding line selection The device is installed in the PT cabinet of the busbar, and is used to receive commands issued by the grounding line selection device and send driving pulses to the thyristor groups connected in reverse parallel; the three-phase voltage and zero-sequence voltage of the busbar are connected to the grounding from the busbar voltage transformer 2 through cables Line selection device; the grounding line selection device a...
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