| 摘要 |
A control for a steam turbine plant having a boiler provided with a superheater and a reheater. A high pressure turbine is connected to receive stem generated by the boiler through first valve means and to supply exhaust steam to the reheater. A medium pressure turbine is connected to receive reheated steam from the reheater through second valve means. A high pressure bypass line connected between the first valve means and the reheater; and a low pressure bypass line connected between the second valve means and a condenser. The control system comprises a first electric control system for the high pressure bypass line including means responsive to the temperature and pressure of the steam supplied to the high pressure turbine for controlling the quantity of steam circulating through the high pressure bypass line; a second electric control system for the low pressure bypass line including means responsive to the temperature and pressure of the steam supplied to the medium pressure turbine for controlling the quantity of the steam circulating through the low pressure bypass line; and a third electric control system responsive to the speed and load conditions of the turbine plant for controlling said first and second valve means. There is an electrical connection between the first, second and third electric control systems so that the operation of the first and second electric control system is modified in accordance with the load of the turbine plant. |
