某变电站110kV进线线路发生单相接地故障时，引起该变电站不接地主变中性点间隙零序保护动作切除运行中主变。通过现场检查及故障录波图，对线路故障而主变保护动作的原因进行了分析，并提出了针对性的建议，以保证系统设备的安全运行。%The transmission line of a substation occur a 110kV single phase grounding fault which causes the action of the main transformer neutral point gap zero sequence protection and the cutting of main transformer operation. Through inspection of fault place and recorded fault data, the paper analyses the cause of the action of the main transformer protection caused by line fault, and gives some specific recommendations in order to ensure the safe operation of the system equipment.
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