Bearing forces of emergency gate during shutoff

For an emergency gate in a surge tank, the forces acting on the gate were systematically tested and analyzed, including pulling forces resulting from water hammer because of the sudden rejection of all loads in turbine units under different gate levels and forces during the process of gate shutoff under the conditions of different numbers of running turbine units. Besides, for the pulling forces on the top of gate, their variation processes with time and extent of gate opening were also tested. It is shown that the calculated value of the gate pulling force agrees on the whole with its tested one. The results indicate that the emergency gate in the extraordinary large surge tank of WWS hydropower station is safe under the above test conditions. The related data in the present paper are helpful for the study of the emergency gate in a surge tank.