The invention discloses a power distribution network
overvoltage fault type intelligent identification method and a fault identification unit, and belongs to the technical field of
overvoltage fault identification. A power distribution network
overvoltage fault type intelligent identification method comprises the following steps: establishing a single-phase arc light grounding fault
simulation model of a neutral ungrounded
system based on a Cassie
arc model, and simulating to obtain a three-phase
voltage and current oscillogram before and after single-phase grounding before and after a fault; by collecting three-phase
voltage, open triangular
voltage and primary side neutral point current of a voltage
transformer, 11 fault types of
metal grounding, arc grounding, medium resistance grounding,
high resistance grounding, under / overvoltage, PT disconnection and
resonance of different frequencies are identified, the fault type of the
system is judged, early warning and suppression are carried out on the degree of harm, and the
system reliability is improved. And a movable fault type intelligent fault identification unit is established for the erected cable, so that the device is stable in movement and convenient to disassemble, and can move on the high-voltage cable to carry out multi-point detection so as to realize accurate identification of a fault position.