Local coincidence type feeder automation protection device with residual voltage locking function

The invention relates to an on-site coincidence type feeder automation protection device with a residual voltage locking function, which comprises a feeder automation protection device and a residual voltage detection circuit, and is characterized in that the residual voltage detection circuit is mounted on the protection device in an onboard mode or an integrated mode; a residual voltage locking control module and a local coincidence type fault isolation module are arranged in a processor of the protection device. The residual voltage detection circuit is based on a low-power-consumption trigger and comprises a power supply isolation acquisition circuit, a rectification circuit, a pulse generation circuit, a trigger circuit and a latch circuit which are electrically connected in sequence. The residual voltage locking control module realizes corresponding operation control, does not start the residual voltage locking function if the residual voltage signal is not instantaneous residual voltage, and starts the