Over Speed Gas Turbine

Over Speed Gas Turbine Points : Over Speed Gas Turbine Power Plant AL through it is contemplated to retain the ability o add the mechanical over speed bolt and its trip mechanism, the electronic over speed system is built on the assumption that it is not being backed up by a bolt. The electronic system offers a number of features impossible to obtain with a mechanical system. The system consists of three independent sub systems. sensors. amplifiers, and cards. The system is made to detect the status of these three sub-systems. Before the unit can start up. It any one of card indicates that the status is “running” when the unit is standing still, something must be wrong and the unit can start up. If any one of the cards indicates that the status is “running” when the unit is standing Still something must be wrong and the unit is not turned. During the starting sequence before firing in another words below ten percent speed, the over Speed trip system must revert to the running State or the sequence will not be allowed to proceed. But will alarm once the unit is running, should any one of the three sub-system fail, the unit will continue to run, hut will alarm.
Each circuit is designed for an absolute maximum reliability, but any conceivable failure is a fail-safe one. A failure of a sub-system makes that system tell the unit to shut down, and only the pressure of two other sub systems disputing he trip conditions keeps the unit running. However when the majority indicates a trip state, the unit will trip. An alarm all sound on any abnormality of any of the three sub-systems.
The Over speed trip point, normally set at 110 percent of running speed, is present and not adjustable son no tempering can result since there are different trip speeds. For different machines, and even for the different shafts of a two-shaft machine, the cards are furthermore designed to make it impossible to start with a card in the iron slot.