Setting the overspeed trip too low may result in spurious trips.Īs abeltio noted, an overspeed trip setting of 110% of rated speed is quite common for large indutrial gas turbines in power generation service.įor vendor's alternative designs, you must evaluate each deviation from the API 616 standard. The gas turbine vendor chooses an overspeed trip setting to avoid reaching this maximum speed. This maximum speed, determined by the gas turbine vendor, is selected based on the speed attained on a loss of full load event (perhaps, with a small margin added). Generally, the gas turbine will be designed for a particular maximum speed. Therefore, for a generator drive, the overspeed trip setting would be in relation to the rated speed. For a generator drive, the speed of the gas turbine will be constant and will be referred to as the rated speed. For mechanical drive applications, the gas turbine will operate over a range of speeds therefore, the overspeed trip setting would be in relation to the upper limit of the operating speed range (MCOS). API 616 covers both mechanical drive and generator drive applications.
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