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frame-6 GE controlled by TMR Mark-v Control system. while the load was 34 MW on the gas turbine and the IGV was open to about 74DGA and the average exhaust temp. was 567C. then we gradually decreased the load to 30.6 MW and noticed that the exhaust average temp. increased to 580.2, but illogically the IGV ref. signal CSRGV became 62.4. i.e. it is coming down to close more the IGV instead of opening it, which is very strange then the turbine trip on high exhaust temp. spread trip as one sector temp. was actually lower than the others..
any advice or explanation for the reason of IGV control signal of behaving like this.. there was no any change done in the program and the turbine was working before very normal and there is no other abnormal conditions.
any advice or explanation for the reason of IGV control signal of behaving like this.. there was no any change done in the program and the turbine was working before very normal and there is no other abnormal conditions.