A 66 kV series reactor fire accident is investigated and analyzed in this paper.The accident process and causes are analyzed and finally concluded by the way of the accident site inspection

fault recording

oil chromatography

electrical test and testing at the manufacturer combined with the protection action situation and equipment structure.The fault of shunt capacitor bank is due to the fault of series dry-type air-core reactors discharged to ground after firing and continuous short circuit fault point.The problems exposed in this accident are pointed out and the targeted preventive measures are proposed so to avoid the recurrence of similar accidents.The fault analysis results and prevention measures have universal reference significance for the operation and maintenance management of reactive power compensation equipment in the substation.