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BP600 series microcomputer programmable protection and supervision device is a digital relay protective device used for the protection, control, measurement and supervision of 110KV and below power grid, able to operate under different connection systems (such as single busbar, dual busbar, multiple busbars) and different power grids (neutral point unearthed system, or the system earthed through arc suppressing coil, or small resistance), to provide the protection and supervision function for feeder, capacitor bank, motor, backup protection of transformer, auto-switching of backup source and etc; also it can be used to protect the middle-size three-phase asynchronous motor, or control and protect the shunt capacitor bank.