This article introduces the hazards in the dual protection configuration during the upgrading of the protective device of the 220kV line and the breaker.Besides,it also introduces the hazards caused by the co-existence of the leap-preventive circuits of the operational relay cabinet and the breaker.The inappropriate dual configuration will cause the operation-refusal of the breaker and further bring about the failure protection of the bus differential which will make the related unit stop running and cause the tripping operation of the line.The co-existence of the leap-preventive circuits will make the jam fault happen during the breaking of the breaker and cause the arc discharge,which will cause serious damage to the breaker.%针对220 kV线路保护装置或断路器改造中，进行保护双重化配置，以及操作继电器箱中防跃回路与断路器本体防跃回路共存时，引发的隐患问题进行介绍。同时阐述了双重化不合理配置将带来断路器拒动，进而起动母差失灵保护，造成母线所在机组停运、线路跳闸以及防跃回路共存将引起断路器在分断时卡涩进而引起拉弧，严重损坏断路器等一系列重大问题。
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