Patent ID: 8904804
Filing Date: 2014-12-09
Classification: F02C,F05D

Abstract:
1. An apparatus for protecting overspeed of a gas turbine engine having a combustion chamber, a turbine rotated by combustion gas injected from the combustion chamber to drive a compressor, a fuel shutoff valve installed in a fuel supply line of the engine to shut off fuel to be supplied to the combustion chamber and a controller for controlling operation of the fuel shutoff valve based on a rotational speed of the turbine so as to protect the turbine from overspeed, comprising: a pressure sensor that detects pressure at an outlet of the compressor driven by the turbine; a comparator that compares the detected outlet pressure with a threshold value when a command from the controller to the fuel shutoff valve instructing the fuel shutoff valve to shut off supply of the fuel to the combustion chamber is outputted; and a failure determiner that determines a failure of the fuel shutoff valve has occurred when a comparison result of the comparator shows that the detected outlet pressure is equal to or greater than the threshold value continuously for longer than a predetermined time period, wherein the comparator and the failure determiner are configured to compare the detected outlet pressure with the threshold value and determine the failure of the fuel shutoff valve has occurred based on the comparison result only when the output of the command is detected, and wherein, when the failure determiner determines that the failure of the fuel shutoff valve has occurred, the controller sends a signal to shut off fuel supplied to the gas turbine engine.