GE 531X189LTBAJG1 DC300 LAN TB OPTION

The gas turbine protection system is comprised of anumber of sub–systems, several of which operateduring each normal start–up and shutdown. The other systems and components function strictly during emergency and abnormal operating conditions. The most common kind of failure on a gas turbine is the failure of a sensor or sensor wiring; the protection systems are set up to detect and alarm such a failure.If the condition is serious enough to disable the protection completely, the turbine will be tripped.

Protective systems respond to the simple trip signals such as pressure switches used for low lube oil pressure, high gas compressor discharge pressure, or similar indications. They also respond to more com plex parameters such as overspeed, overtemperature, high vibration, combustion monitor, and loss of flame. To do this, some of these protection systems and their components operate through the master control and protection circuit in the SPEEDTRONIC control system, while other totally mechanical systems operate directly on the components of the turbine. In each case there are two essentially independent paths for stopping fuel flow, making use of both the fuel control valve (FCV) and the fuel stopvalve (FSV). Each protective system is designed independent of the control system to avoid the possi-bility of a control system failure disabling the protective devices.