After half an hour to synchronize the unit, the temperature matching once activated. the unit switches the mode of combustion of 1D to 3D. in 3D in a minute the GT trip, to be lost hit LOB blocking in the valves of purge VA13-3 and VA13 -4 of the G3 gas line, by high pressure between the valves and pressure switches activated causing the signal of trip of the unit. Tras perform checks on sealing and time open/close valves of purge, vent valve VA13-12 and calibration pressure switches, two hours after it restarts the unit and the combustion mode switching, is without problems remain for 30 minutes in 3D, start the unit without problem.

The next day a restart is performed, trip again, and restart the unit. In the second start VA13-12 purge valve is changed.

In the first start, after a 12 hour to stop the unit,in 3D mode combustion (in previous starts of the unit remains for 1 minute and changed to 6.2 without problems) in these last starts trip.

Because at the first start the change is done in 1 minute and the second remains 30 minutes in 3D, when the second star the has made the warming of the HRSG, it has been the HRSG heated for 30 minutes.

Which may be the cause of the trip?

Thank you

 

elomoon,

List the Process Alarms which were annunciated just prior to, during and after the trip, along with their times, for a period of 60 seconds prior to the first trip message, and for a period of ten seconds after the last trip message. (GE control systems are notoriously bad about blocking trip messages which may, and quite often do, occur after the initial cause of the trip. BUT, looking at the alarm times can help with understanding what the initial cause of the trip was.)

Also, it would be VERY helpful if you could provide any Diagnostic Alarms that were active before the trip condition, as well as during and after the trip condition. (Diagnostic Alarms are those alarms that everyone usually ignores--but can be extremely helpful in diagnosing problems.)

The GE-design heavy duty gas turbine control philosophy (which Belfort doesn't always follow, unfortunately) is: EVERY condition which results in a trip of the unit will cause a Process Alarm to be annunciated to alert operations to the cause of the alarm.

Trying to troubleshoot turbine trips without the list of Process Alarms (and the times they were annunciated) is virtually impossible.

Also, please try to take a few minutes, read your original post again, and make a time-line of sorts (a list of the things which happened during each of the events in chronological order--you don't have to list precise times, but the order is most important). It's clear English is not your primary language, but, take some time and try to be more clear about the events--<b>in addition to providing the lists of Process (and Diagnostic) Alarms which occurred prior to, during and after each event along with the times of the alarms.</b>

Without more information, we can't be of any more help. And, Process Alarms--contrary to popular belief--are critical to understanding what happened and what actually tripped the turbine.

 

Thanks CSA

I will include in the next post the List the Process Alarms using the historical Alarm Viewers of CIMPLICITY HMI (SOE, EVENT and diagnostic alarm) to collect trips day.

I will also include the list of the things which happened during each of the events in chronological order.

Where you could get information design control mode, changes the DLN 2.6 combustion system, a 9FB, particularly when changing 1D to 3D using natural gas as fuel. According TTRF temperature varies depending on the control logic matching temperature to 875 ° C changes from L (1D) to N (3D) mode and 1010 to reach 6.2 ºC 3D.

Thank you.

 

elomoon,

The best place to start looking for information is always in the manuals provided with the equipment by the packager. There should be a section about the Fuel System in the 'System Description' section of the manuals.

Also, there is a document provided with the control system called the 'Control Specification.' Section 05.nn.nn is for the 'Fuel System' and that should have a lot of information. Sometimes DLN is explained in more detail in another section of the Control Specification.

But, since you have a relatively new turbine, you could always ask the packager (GE or one of its manufacturing/packing associates) for more information--especially if it's still under warranty. GE usually has DLN troubleshooting diagrams and charts--but only if you ask for them....