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.
220kV system as the transmission network, its performance is directly related to the safe use of electricity customers. The neutral point occurred in 220kV substation in the air gap breakdown accident phenomenon by tracing back to the time of the accident the sequence of failures the double bus double combined substation variable connection mode the overvoltage calculation and simulation. The simulation results and on-site analysis show that the main reasons of the accidents is A-phase short-circuit grounding of 220kV line caused by guano flashover, which transient voltage and short circuit current made main transformer neutral point broke down, and the protection device trips the three-side circuit breaker of the main transformer. A solution scheme for extending gap action setting time was proposed, which was fit for the time limit of line reclosing protection, in order to avoid the similar accidents.
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