Analysis of a 35kV"Z"Type Grounding Transformer Zero Sequence Protection Misoperation Accident
This paper describes the principle of Z-type grounding mode,analyzes the causes of zero sequence protection misoperation in the grounding transformer for a single-phase grounding fault case of 35kV outgoing line in a 110kV substation,and proposes solutions and suggestions,including modifying the grounding transformer protection setting value and using microcomputer protection software for zero elimination.
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