The automatic switching device of the backup power supply only allows one action. When explaining that the automatic switching device of the backup power supply meets the logic program for startup, capacitor "charging and discharging" is widely used to simulate this function. The automatic switching device of the backup power supply meets the logical conditions for starting, which should be understood as meeting the "charging" conditions; The delayed start time should be understood as the completion of all preparation work after the "charging" time; When the automatic switching device of the backup power supply operates or any locking and pushing out conditions exist for the automatic switching of the backup power supply, the "discharge" is immediately completed. Discharge "refers to the simulation of locking the automatic switching device of the backup power supply. After discharge, the automatic switching device of the backup power supply will not occur. In power plants and substations, AAT devices should be installed according to the following principles: (1) The auxiliary power supply of the power plant and the power supply used in the substation equipped with the backup power supply. (2) A substation powered by dual power sources with one power source frequently disconnected as a backup. (3) A step-down substation with backup transformers or mutually backup bus sections. (4) Some important paving machines with backup units
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