The high-voltage cable radial power supply is used in a 10 kV ungrounded system,and the system is equipped with a set of arc suppression and harmonic elimination cabinets.During operation,it was found that after a single-phase arcing fault occurred in a specific area,the grounding protection and arc suppression and harmonic elimination cabinet could not quickly extinguish the arc,resulting in a single-phase grounding fault developed into a phase-to-phase short-circuit fault.In order to solve this problem,the single-phase ground fault relay protection,arc suppresion and harmonic elimination action logic is opti-mized and improved to ensure that if a single-phase ground fault occurs in any area of the system,the arc can be quickly extinguished and the fault can be eliminated.
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