Steam turbine governing system for maintaining synchronization and process for performing the same

A steam turbine governing system for maintaining synchronization between an electrical grid and an electric generator after the occurrence of a grid short circuit at the electrical grid, said electric generator driven by a steam turbine, said steam turbine governing system comprising:

• a governor adapted to control a valve arrangement for regulating steam flow in the steam turbine;
• means for measuring voltage drop at an output of the electric generator;
• means for measuring electric power drop at the output of the electric generator, with the governor connected to the means for measuring the voltage drop and the means for measuring the electric power drop, and operable to initiate operation of the valve arrangement in response to the voltage drop exceeding a predetermined value of voltage at the output of the electric generator and in response to the electric power drop exceeding a predetermined value of electric power at the output of the electric generator, to maintain synchronization between the electrical grid and the electric generator after the occurrence of the grid short circuit at the electrical grid;
• and
• measuring means for measuring duration of the grid short circuit, the measuring means operable for activation when the voltage drop exceeds the predetermined value of voltage at the output of the electric generator and the power drop exceeds the predetermined value of electric power at the output of said electric generator, and the measuring means operable for deactivation when the voltage drop and the electric power drop are eliminated.