| 摘要 |
PURPOSE:In a device for reducing the oil pressure abruptly upon turbine tripping to close a steam valve abruptly, to improve the reliability of operation by employing a servo valve and a hydraulic valve in the hydraulic trip circuit while providing a pressure transmitter to enable monitoring of the operation of the hydraulic valve. CONSTITUTION:When more than one of the trip signals TS1-TSn are transmitted, an analog signal is transmitted through a relay circuit 100 and a servo amplifier 110 to a hydraulic trip circuit 120 where the analog signal is converted into a hydraulic signal to close a steam valve abruptly. Upon production of trip signals, said circuit 120 will exchange the oil paths of the servo valves 121, 122 to transmit the feeding oil pressure Pso to check valves 125, 126 and oil pressure valves 127-130. Here the pressure Pso is blocked by the check valves 125, 126 to increase the load oil pressures Pd1, Pd2 thus to open said valves 127-130 then Pso is discharged to a hydraulic tank 9 thus to close the steam valve abruptly. |
