Method and system for generating tripping signal of steam turbine of nuclear power plant

The invention discloses a tripping signal generation method and system for a steam turbine of a nuclear power plant, and the method comprises the steps: constructing two logic sequences at a safety level instrument control system side, the two logic sequences generate four paths of steam turbine tripping signals and send the four paths of steam turbine tripping signals to a steam turbine protection system for two-out-of-four logic voting, and then a steam turbine tripping driving signal is output; and the logic processing units of the two logic sequences are respectively arranged in different cabinets. Two logic sequences are adopted to output four paths of steam turbine tripping signals to a steam turbine protection system side for two-out-of-four logic voting, then real steam turbine tripping driving signals are produced, and a plurality of logic processing units of different sequences are placed in different cabinets. And the probability of mistakenly sending a steam turbine tripping signal or refusing to