Online calculation method and system for air leakage of hydropower station braking air consumption system

The invention discloses an online calculation method and system for air leakage of a hydropower station braking air system, and relates to the technical field of hydropower station operation and maintaining.The online calculation method comprises the steps that the cavity volume when a mechanical braking device of a single unit is put in and withdrawn is calculated, and the operation state of an air compressor of the braking air system is judged based on the cavity volume; determining starting conditions of the air leakage calculation process; the starting interval duration of the air compressor and the compressed air variation of an air storage tank of the braking air system are calculated, and the mechanical braking air consumption of the unit is calculated by combining the starting interval of the air compressor and the compressed air variation of the air storage tank; according to the method, the pressure change is monitored, the difference between the expected pressure and the current pressure in each ti