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Really poor earthing practices are usually the cause of equipment failures after an electrical storm. You have really provided very little information to be of much further help. We don't know if this is a Mark VI that was commissioned when the unit was new, or if it was commissioned as an...

RichT88, Fuel is "moved around" between combustion zones in a DLN-1 combustor and as you have noted, it's all about TTRF1. TTRF1 is a "calculated" firing temperature, and it's just used as a "switch" for DLN-1 combustion modes. The fact that load is suddenly changing is an indication that...

Jesus, I don't really understand the question. In general "coast down" refers to the time after the generator breaker is opened during a normal, fired shutdown, to the time the unit reaches cooldown or zero speed (some units use "slowroll" for cooldown and never go to zero speed; others use a...

Some years ago, GE invested in Nuovo Pignone, which for many years was a licensed packager (Business Associate; Manufacturing Associate) of GE gas turbines. NP sold GE-design heavy duty and aero-derivative gas turbines for years for both power generation applications as well as mechanical drive...

When did this problem start? How long has it been since the filters were changed? Does the inlet filter house have a "rain hood" which tries to prevent rain from impinging on the filters and causing the filter media to become wet and swell and increase the differential pressure across the...

The only written reference that you should trust when trying to understand GE heavy duty gas turbine control for your machine is the sequencing or application code running in the Speedtronic turbine control panel at your site. The sequencing or application code running in the Speedtronic panel...

You need to examine the relay outputs of your Mark VI to see how they are configured. As previously described, GE typically uses NC contacts of relay outputs in the AUTO circuit of many, but not all, motor starters. Some examples of motors that are typically not driven with NC contacts are Liq...

otised, I'm pasting this from a previous posting from SSV: >Fourthly, I am working on retrofit of GE steam >turbine (from MARK III control to Ovation DCS). >So are these gas turbine droop control >fundamentals applicable to steam turbine also ? >(obviously not exhaust temp. control) I...

I neglected to ask the single most important question in troubleshooting: When did this problem start? If the unit has been working fine for some time and the problem just recently started, then it's likely one of the things which have been mentioned previously. If this has been an...

I would really need to see the sequencing running in your Speedtronic panel to comment on how your unit is configured. TTKOT1 is, as you said, a maximum upper limit, which is usually set to 40 deg F above the isothermal value. And you haven't told us what the isothermal value(s) is(are)...

If your Company uses operator interfaces with IDOS (called <I>), then your Company will find it very difficult to purchase them, except from a source of used or "new, old stock" cards (both of which will be very expensive). The ARCnet cards used in <I>s and in very early GE Mark V HMIs (running...

Generators are typically rated in MVA, not MW. The MVA rating is a total load, real and reactive, not just real power (MW). If I understand the post correctly, you are asking if you can run a generator at a power factor that is "greater" than the rating. A power factor of 0.8 would mean...

In my personal opinion, it doesn't take 15 A to burn the traces on a DTBC or DTBD, or the ribbon cables connecting them to the TCRAs. And, once there is damage on the DTBC or DTBD, it's not very far, physically, to a trace with the opposite polarity which can cause the arcing and "fires" that...

There should be two ignitors, for redundancy, and while it's not impossible it certainly is unlikely that both of them are not working well enough to re-ignite the primary zone during operation. I have seen it happen, but it's usually on older units which are operated in cyclic duty (that is...

You haven't told us what the value of TTKOT1 is for your machines. TTKOT1 is the "maximum" (ultimate?) over-temperature trip setpoint, and it's usually set for (TTKn_I + 40 deg F), so if TTKn_I is 1100 deg F, then TTKOT1 would be 1140 deg F. (I'm using Fahrenheit because that's how GE...

Most of these incidents can be traced to improper wiring practices. It's difficult to describe without graphics or pictures, but for most of the heavy duty gas turbine Mark V panels GE packaged they did not typically use two wires for every solenoid output (a "hot" wire and a "common", (wire no...

There would be no problem opening the generator breaker at 3 MW. You can use the LOWER SPD/LOAD button/switch/target to lower the load to 0 MW, or even to lower it to allow the reverse power relay to trip the unit, but that would take some time, so best to open the breaker manually when the...

I'm hoping MIKEVI will add the benefit of his experience here, as I believe they just went through some EX2K communication issues at his site not too long ago. Amazingly enough, I have seen and heard of more failures of BNC tee connectors and right-angle connectors, and even a couple of...

V.Venkatachallam, Can you please tell us what caused the GCV to be stuck?

Robert, There are Frame 6Bs and Frame 6FAs, but I don't believe either are rated at 110 MW. I've never personally heard of a 6FA single-shaft STAG unit (with the gas turbine, steam turbine and single generator all coupled together on the same shaft); that doesn't mean it hasn't been done, but...