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Hello everyone,
This is my first post in control.com. I'll try to be as concise as possible. We are working on MS-3002J gas turbine operating on a Mark6e control system.
After a hot gas path inspection, we started the machine and everything was ok till 51% TNH (acceleration phase) when the turbine trips on "L60BOG_alm HP turbine fails to accelerate". We checked the triplog and noticed that the TNH dropped from 51% to less then 46%. In fact, when we took a look on the logic we found that if the TNH decreases for more than 5% of the last Max TNH value, the turbine trips. Then we checked the FSR. It dropped from 23% to 12%. We thought that there might be a shift in the FSR from fsracc to fsrmin but nothing explains this hypothesis.
Now the turbine is running after we decided to force the logic (production requirement) but if the turbine trips again, we're likely to cope with the same problem.
So my question is, what would cause the FSR to drop?
One last thing we have noticed is that this drop in the FSR happens just after the LP turbine start.
NB:The second stage nozzles are in the full open position 15°angle
The cranking motor is disengaged.
if any other details are needed just tell me.
Thank you in advance.
This is my first post in control.com. I'll try to be as concise as possible. We are working on MS-3002J gas turbine operating on a Mark6e control system.
After a hot gas path inspection, we started the machine and everything was ok till 51% TNH (acceleration phase) when the turbine trips on "L60BOG_alm HP turbine fails to accelerate". We checked the triplog and noticed that the TNH dropped from 51% to less then 46%. In fact, when we took a look on the logic we found that if the TNH decreases for more than 5% of the last Max TNH value, the turbine trips. Then we checked the FSR. It dropped from 23% to 12%. We thought that there might be a shift in the FSR from fsracc to fsrmin but nothing explains this hypothesis.
Now the turbine is running after we decided to force the logic (production requirement) but if the turbine trips again, we're likely to cope with the same problem.
So my question is, what would cause the FSR to drop?
One last thing we have noticed is that this drop in the FSR happens just after the LP turbine start.
NB:The second stage nozzles are in the full open position 15°angle
The cranking motor is disengaged.
if any other details are needed just tell me.
Thank you in advance.