the speed load of the GT generator is 5100rpm.GT is a GE frame5 turbine with Mark-VI controller. the turbine is started and with normal condition achieve to the 4000rpm, after this speed the acceleration is reduced and after half hour it may reach to the 4200rpm. and after a while turbine is tripped with the "fail to achieved the 14th speed" alarm.

i will appreciate you for your helps.

 

When did this problem start? After a maintenance outage? After a servo-valve replacement? After an LVDT calibration/re-calibration procedure? After the unit tripped from a high load?

What have you done to troubleshoot the problem? What were the results of your troubleshooting?

What fuel is being burned during the failed start attempts?

What is the exhaust temperature during the prolonged operation between 4000 and 4200 RPM?

What are the values of the following Control Constants:

FSKSU_FI
FSKSU_WU
FSKSU_AR
FSKSU_IA
FSKMIN_N[1]
FSKMIN_N[2]
FSKMIN_N[3]
FSKMIN_N[4]
FSKMIN_D[1]
FSKMIN_D[2]
FSKMIN_D[3]
FSKMIN_D[4]

[NOTE: If the unit is dual-fuel (gas/distillate), there may be two FSKSU_FI values, sometimes called FSKSU_FI_LIQ and FSKSU_FI_GAS, or something similar. Provide both values is the unit is dual fuel.]

What is the value of FSR during the prolonged operation between 4000 and 4200 RPM?

What is the value of FSRT during the prolonged operation between 4000 and 4200 RPM?

Is the starting means still engaged via the clutch during the prolonged operation between 4000 and 4200 RPM, or has the starting means shut down?

To get the most concise and quickest responses when you post a question like this to a forum like this, remember: We are not there with you. We don't know what you know. Although from a general perspective all Frame 5s are generally alike, most have some very different distinctions. We don't know what fuel is being burned. We don't know what kind of starting means the unit has, or how it's connected to the turbine shaft (via jaw clutch or SSS clutch). We don't know a lot about the situation. So, the more you tell us about the unit and the situation, and especially what kind of troubleshooting you've done and the results of that troubleshooting, the faster and more concise the response will be.

When a problem like this "suddenly" appears, it almost <b>always</b> turns out that something changed just before the problem suddenly began. In other words, something changed and that something is either directly related to the problem or is contributing to the problem.

But, we can't provide magical answers for problems we don't fully understand.

And most importantly, every question is equally important and we need the answers to all of them to be of the most help.

 

We really need a lot more information from you to try and understand your problem. All the usual things, when did this start to happen? Have you been doing any maintenance or software changes? What control system do you have and can we have a look at your alarm list? etc.

You are really running in a very dangerous situation if you have really run your machine for 30 mins. at 4200 rpm (and I would think, probably on Temperature Control)I wouldn't do this again until you can troubleshoot the problem a bit more, at least trip the machine if it "hangs" at 4200 rpm again, it's not going to accelerate and there is a high chance of doing some permanent damage.