Nuclear energy heat supply system and overspeed protection control signal transmission method thereof

The invention discloses a nuclear energy heat supply system and an overspeed protection control signal transmission method thereof.The overspeed protection control signal transmission method of the nuclear energy heat supply system comprises the steps that after a steam turbine auxiliary system receives an overspeed protection control signal, the steam turbine auxiliary system transmits the overspeed protection control signal; the signals are respectively transmitted to the heat supply system through a plurality of groups of signal transmission devices connected between the steam turbine auxiliary system and the heat supply system; if the heat supply system receives at least two of the multiple sets of overspeed protection control signals, regulation and control signals are output, and the regulation and control signals are used for controlling closing of controlled equipment between the heat supply system and the steam turbine auxiliary system. The method is suitable for overspeed protection control when the