Insulation Breakdown Fault of 35 kV DNF7 Type Sectionalized Feeder Switchgear
This paper provides a detailed analysis of a 35 kV fourth/fifth type sectionalized feeder switchgear insu-lation breakdown fault that occurred at a 220 kV substation in Shanghai.Through on-site inspections,disassem-bly analysis,and insulation material performance testing,the root cause of the fault was identified as the insula-tion performance reduction of the DNF7 switchgear contact box insulation material due to the aging and mois-ture absorption after the long-term operating.Thereupon,targeted fault handling measures and follow-up preven-tive strategies are proposed,including strengthening partial discharge detection,developing a switchgear modifica-tion plan,and implementing insulation component overhauls to prevent similar faults from recurring.
pouer distribution networkfeeder switchgearinsulation breakdowntracking resistance testing
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