The gas Turbine trip at 24% speed, with no alarm, the only thing we can see on the alarm page is master protective trip. And another thing we notice during the run up is that ssov is close and the vent is open, but as the unit get to 23/23% speed, the vent open and close back but the ssov remain close and at this point the machin trip. Please can any one help out, an bond to be corrected thanks