Abstract:Aiming at the problems of installation and debugging difficult of traditional mechanical travel switch and inadequate action of air gate travel switch, a hydropower station adopts the proximity switch based on Hall sensor principle to replace the traditional mechanical unit air gate travel switch, and develops an automatic detection system that can collect the state of the unit air gate and monitor the displacement of the air gate. The automatic detection system collects the state and displacement of the brake air brake of the unit by PLC, makes logical judgment, and uses the intermediate relay to the calculation monitoring system of the hydropower station and the brake control screen of the unit. At the same time, the stroke displacement of the brake air brake of the unit is transmitted to the background of the calculation monitoring system, which is convenient to monitor the state of the air brake.