I’m study a machinery p&id of a GE PGT25 gas turbine. I noticed that there are two separate speed probes, one for gas generator rotor speed and one for power turbine rotor speed. Both probes given high velocity trip; gas generator rotor speed trip is set higher than power turbine rotor speed.
Can you, gas turbine experts, tell me why we need 2 velocity measurements with 2 different trip set point?
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