ELECTROHYDRAULIC BARRING GEARDescription and operationThe electrohydraulic barring gear shall operate only after turbine stop; should it work be- fore the rotor has completely stopped, serious damages would affect the barring system.The electrohydraulic barring gear is switched on by a key-switch, while the permission to work is given by a tachometer mounted on the machine thus assuring that the barring gear operates only with rotor fully stopped.The electrohydraulic barring gear is stopped by the key-switch.