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NurKyon, The GE Mk V HMI uses a special CIMPLICITY AMV alarm object for displaying Process Alarms from a Mark V turbine control panel. Everything else on the HMI can be working 100% correctly--and that AMV alarm object won't be able to display alarms correctly. If you can see live data on...

NVS, You said you replaced the lube oil filters. While the same fluid is also used for the hydraulic system, there are almost always additional filters for the hydraulic system. Were those replaced also? Yes; certainly dirty lube oil/hydraulic oil will cause problems. I'm not aware of any...

Priyanka, Have you held both devices you are trying to interchange in your hand(s), or held one or the other while looking at the device you wish to replace? They are--usually--very different devices. A snap action relay (sometimes called a snap acting relay) is a device with contacts...

NVS, Is the Mark V a SIMPLEX or TMR turbine control panel? Is the generator synchronized to a large electrical grid, or is it synchronized to a smaller electrical grid ("island")? If it's a smaller electrical grid ("island"), is this unit operated in Droop- or Isochronous Speed Control...

I would tend to agree with Mark Allen, but, again the specifics of the site and configuration and its operation are very important in monitoring the effects of VArs and voltage changes--particularly on generators. I've been struggling to try to come up with some kind of "table" or other...

javan, Unfortunately, as far as I know GE has NOT published a "compatibility" list for what versions of MS-Windows each version of CIMPLICITY (and it's subversions: Service Packs) work together, and which versions of TCI and CIMBRIDGE are required for all the versions of MS-Windows and...

OT, The <C> processor is commonly known as the "Communicator" and is primarily responsible for allowing operator interfaces (HMIs) to view data from the three control processors (<R>, <S> and <T>) and to send commands to the three control processors. All of the "critical" I/O is connected to...

Rudy, Your are correct: I would not expect to see what you are reporting. However, that doesn't mean it's not happening. I haven't seen every type of mill and control system. The thing that's missing from your reporting--for me to comprehend things--is what are the VArs doing when...

As usual, Bruce Durdle's comments are very helpful. Markthesecond's are also helpful. Reactance between generators and portions of a transmission and distribution system (internal to the plant, as well as external to the plant) has a LOT to do with how generator terminal voltage changes...

Mambo, Long time no hear from you. Last we did, you were going to report back about the results of your investigation into reported loss of power after fuel BTU content was found to have dropped significantly. I don't have access to GEH-6195, The Mark V Application Manual, which I believe...

sankar, I was doing two things in my last post. First, I was asking if you'd tried using the 'Help' feature of the Bently-Nevada configuration software, and, second, asking if you'd used your preferred Internet search engine to try to research any of your questions. Good to hear you were...

Rudy, The function, and the use of, load tap changers seems to vary depending on the site. I see sites with load tap changers that almost never change taps, and control VArs/power factor by varying excitation as required. And I see sites with load tap changers that almost never change...

david, The temperature regulating valves and actuators typically provided with most GE-design heavy duty gas turbines are NOT installed with the proper protection required for a device with a capillary tube. People climb around piping and piping components without a care--as if any component...

Rudy, I've always heard it called a load <b>tap</b> changer. A tap is essentially another name for a "contact". A load tap changer is a device which can change "contacts" when current (apparent (real + reactive)) is flowing through the transformer. (Some transformer taps can't be changed...

Have you used the Bently-Nevada 'Help' for your queries? If so, what did you not find explained sufficiently for you to understand? The Internet search engine search term was (including the double quotes): "complementary differential expansion measurement" The first relevant response...

While many similar GE-design heavy duty gas turbines are called Frame 9E machines, that basically just refers to the design of the machine (number of combustors; number of stages of both the axial compressor and the turbine; number of turbine bearings; etc.). The actual hot gas path...

david, Yes, it is possible (better) to use instrument air at all times--if it's available at all times. I only mentioned startup and shutdown because some times plants don't have air available then. But if there is a reliable supply of dry instrument air at all times then it's better to...

david, A proper design would have had low-point drains in the actuator air supply as well, as mentioned before. If your plant has a reliable source of clean, dry instrument air that is available during unit starting and shut down, that is always a better choice. The concept behind using...

Is the DCS not capable of controlling the GT at this time? Is the "Master Control" not set for "Remote" or "Cable Remote" or "Serial Remote" or "DCS"? Control Hierarchy is one method by which operation from other "locations" is prevented when one location is selected and active. It is a VERY...

>>>!!!CORRECTION!!!<<< I've been told Frame 9EA DLN-I combustors have six (6) primary fuel nozzles per combustor (per primary fuel nozzle body), for a total of 84 primary fuel nozzles per turbine.