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  1. K

    Steam turbine maintenance

    Traditionally, it's been the standard to do it about every 5 years. These means pulling the cover, going through everything, inspecting and repairing as needed. Some utilities are extended that to 6, 8, 10+ but have very extensive monitoring and quality control. There is lots of information...
  2. K

    Gas Turbine

    I got a story about reverse power that just happened. We are doing testing of all units and part of the test is to take voltage 95% to 105% rated (swing the vars...give and take...leading to lagging...0.5 to -0.5 PF...13.2 to 14.4....however the heck you want to say it). This is done at...
  3. K

    DLN Operation

    This is a generic response, but a good thing to remember. NOx reduction in any combustion process is OFTEN achieved with three T's. Time, Temperature, Turbulence. This applies to coal burners or gas turbine combustors. Usually the goal is to limit peak combustion temperature by extending...
  4. K

    Reaching Base Load

    Sort of on topic (for CSA lol)..... I had to do a 1% speed reference step change on frame 6 for testing. The testing company says GE usually puts in a sum block with logic that adds 1% to the speed ref signal, but the GE TA wasn't familiar with that. So I found the constant that controls...
  5. K

    Mark V governor variables (droop, gain) and I/O

    The block that is causing the pain is a XPLAG00 Prop+Lag Control. The variable in it that is limiting the opening of the valves is the "Lag" variable (time constant). It is 10second. I did testing dropping it to 5, 2, .5 and 0. At 0 it finally let the valves go where the speed control loop...
  6. K

    Mark V governor variables (droop, gain) and I/O

    To give an update and closure to this thread: I found the "droop". It's given by GE in %/% and the value is 20. There was something limiting the opening rate of the valves on the steam turbine. Digging through the logic I found there is a inlet pressure scheme that had a clamp/ramp...
  7. K

    Load Sharing Problem for New Turbine

    AGC by definition is "Automatic generation control". Now many people have different ideas of what AGC does--but I think it's safe to say that AGC is an outside control system that divides the load up among plants according to limits programmed into it. It was done in the old days by humans...
  8. K

    Mark V governor variables (droop, gain) and I/O

    >That sounded like you were looking for >P & I values, to me anyway. Well, I at first I didn't know what I was looking for LOL. You can see in an above post I found the constants that drive the "Speed Control Block". I think the "Speed error gain constant" is the droop I'm looking for...
  9. K

    Mark V governor variables (droop, gain) and I/O

    Spent a little more time digging. I got the csp printout and found the XTNCB02 "Speed control block". Some of the constants it uses follow. I see nothing explicit for droop. My GUESS (which is non educated) would be that KTNE_G Speed error gain constant is key.<pre> KTNED_HOLD -- Speed...
  10. K

    Load Sharing Problem for New Turbine

    Sounds to me like you need to implement an automatic generation control (AGC) system that will set unit loading.
  11. K

    Mark V governor variables (droop, gain) and I/O

    >The quote is: >By the way, you've got quite a machine >in that 40MW GE-design Frame 5 heavy >duty gas turbine. You'd be right if I didn't mistype--it's a frame 6. Sorry about that. We also have two frame 5 and two lm2500, but they rarely run.
  12. K

    Mark V governor variables (droop, gain) and I/O

    >"You may find better; but you'll never >pay more." > >In its purest form, droop speed control >is proportional control, pure and >simple. Let's move back a few steps. As much as I appreciate discussion, I'm not here to learn about the theory of speed control and subsequently power...
  13. K

    Mark V governor variables (droop, gain) and I/O

    Thanks for the info. On this thread: http://control.com/thread/1294347789#1294426997 it is shown how to calculate the droops. Funny how GE does things way more complicated than other governor makers. I will look for the loading rate in the CSP and see what constant it calls. I've found...
  14. K

    Mark V governor variables (droop, gain) and I/O

    We are tuning to governors on our large Island system and we have a couple units with Mk V controllers. One set is on two 66MW steam turbines (Mk V triple redundant, EX2000, EHC, WinNT HMI). Other one is on a frame 5 40MW gas turbine running liquid fuel (diesel) ONLY and an iDos. I'm...
  15. K

    MARK-V (IDOS) Historian Installation

    About a month ago I had to restore our mkV historian, but it was a windows system. However, to re-initialize the files I just followed the procedures in the historian manual. It was pretty step-by-step.
  16. K

    HRSG drum level trip - ST low steam temp trip

    High drum level can be a problem. I was just in a control room 3 hours ago during a refire and the drum level got high...most drums being cylinders doesn't help either. I understand the desire for safety mechanisms, but do you really want the HRSG to trip right away at a High-High alarm? I...
  17. K

    Mk V 3rd party HMI experiences?

    Thanks, I'll be in contact with those of you that offered your opinions. Sorry for the delay, I've been very bush with a post-outage startup. I have contacted Global Controls and CSE and received some information. This isn't an immediate need, but I'm just researching. The other thing is...
  18. K

    PLC or DCS for Boiler and Turbine control

    John, Your post about upgrading a 40yr old pneumatically controlled plant is EXACTLY what I am trying to accomplish right now. We have two steam plants built around 1973 with mostly Bailey pneumatic controls. I'm new to the utility (been there 1.5 month), but they have had some vendors come...
  19. K

    Mk V 3rd party HMI experiences?

    Thanks for the info on TMOS. My understanding is that the GCI and TCI systems operate with the same method--they both directly communicate with MkV using Stagelink Arcnet. I see no benefit in upgrading to MkVe, unless giving money to GE is considered a benefit. Our company actually has two...
  20. K

    Mk V 3rd party HMI experiences?

    I've done a lot of reading of past posts. I am considering upgrading our HMI's on our two MarkV steam turbine controllers and EX2000. They were installed around 2001 and have WinNT4.0 with 2 HMI's, 2 viewers, and 1 historian. I believe I have two never used spare HMI "black boxes" from around...
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