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Reactor equipment is widely used in high-voltage backbone power grid, and its reliability directly affects the safe and stable operation of large power grid. In this paper, a 35 kV Vacuum Circuit Breaker breaking shunt reactor accident in a substation is deeply analyzed. Firstly, the protection misoperation is comprehensively analyzed by means of on-site fault characteristics, theoretical simulation calculation and return to plant disassembly inspection. Secondly, by integrating various information and adopting the analysis method of combining theory with practice and combining in plant traceability and test verification, aiming at the defects of the protection device of the substation, technicians and manufacturers comprehensively inspected the protection device and confirmed that there was an error in the background logic of the monitoring device, resulting in the wrong opening signal. After the manufacturer upgraded the monitoring software, the defect was eliminated. Finally, according to the fault causes, the follow-up countermeasures for such faults are put forward.
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