The mechanical braking system of pumped storage units adopts a pneumatic brake system,which controls the compressed air entering and exiting the upper and lower chambers of the brake,and operates the brake to lift and lower,achieving the input and output functions of the unit's mechanical braking.The control air circuit mainly consists of an electromagnetic directional valve and pipelines.The control circuit switches the valve position air circuit by controlling the coil action of the electromagnetic directional valve,thereby controlling the on/off of the brake.The control circuit also needs to ensure the function of signal blocking,and based on the feedback signal of the unit's operating status,achieve automatic control of the unit's mechanical braking system.
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