Gas Turbine Trip

Hi,

Can anyone help in finding the Trip sequecning of GE E class machine?

Thanks,
Shaji

Your question is a bit too broad. Without details such as the model (ex. 5001D, 6001B, 7001E ETC.), application, type of fuel, starting device, etc. it is hard to explain this. Typically the documentation supplied with the unit will have this information.

Radhakrishnan,

I like that: "Your question is a bit too broad."

We don't even know what kind of control system is in place.

And when you say "documentation" what are you referring to? The logic diagrams? The written system descriptions?

If the originator has a Speedtronic turbine control system, the answer to the question "What can trip the turbine?" can be found by working backwards in the logic diagrams (elementaries, CSP, application code, depending on the vintage of the panel) from L4T (or 4T if the system is old enough).

If the originator wants to know what happens when the unit is tripped by one of the conditions which actuates L4T (or 4T), that, too, is kind a function of what kind of machine and auxiliaries the site has, but suffice it so say that the fuel is immediately shut off and the unit should coast down to zero speed/Cooldown operation. Whether or
not pumps are started or fans are stopped, etc., is a function of the machine, it's application (generator- or mechanical drive), and the type of auxiliaries it has. But, the specifics of this, too, can be obtained by "reading" the logic diagrams for the control system in use.

CSA,

As you mentioned, the CSP (in Mark V) or the Toolbox project in Mark VI will have the answer. However, for many installations (especially for units shipped from GE Oil and Gas), the specific manuals for the unit will have write-ups on the start-up and shutdown sequences. More over, the documentation will also have Cause & Effect Matrix.

For a new-comer, eventhough it is the correct way of learning the system, getting information on the startup and shutdown sequences from CSP can be a bit, to say the least, "time-consuming". But the time spent is well worth it.

I've always found those write-ups to be very generic in nature, whereas the CSP or the Toolbox file/application code is *THE* exact operating sequence.

No; reading the sequencing is not easy, but if you want to really understand the unit, there's no other way.

Learning to program a computer means learning a new language; relay ladder diagrams are really fairly easy, and if one understands how GE chooses signal names reading their relay ladder diagrams is fairly simple compared to some FBD code I've tried to read. Every rung is a sentence, a formula.

Yes, it takes some practice, and it's difficult at first, but every time I've "trusted" some written description, I've been very sorry, and embarrassed. Write the descriptions yourself from the sequencing by just reading the sequencing!