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Yes, everyone would like their plant to switch from export- to island mode without a bobble when the tie-line breaker opens suddenly and without warning. People in hell want ice water, too. As the Rolling Stones song goes, "You can't always get what you want. But if you try sometimes, you just...

Specifically, what kind of GE machine are you working on? What kind of GE Speedtronic panel are you working on? What kind of signal name are you trying to understand? Please provide some examples. For many signal names with one or two digits in them, such as L1Z or L63QT, the numbers...

Hi, It doesn't seem that any 9FA user here has any information that may be of assistance to you. This is primarily a controls forum, and while gas valves are part of the control system, they are positioned by the electrohydraulic servos connected to the control system and provide feedback to...

I have located a Mark V CSP for a Frame 9E; the Liquid Fuel FSR is FSR1, and it is multiplied by (TNH/100) to derive FQR, and FQROUT. The liquid fuel flow divider feedback is FQL1, and it's multiplied by KFQLM1 to derive FQLM1. I believe the servo regulator on the TCQA card uses the...

There is another thread response which is more appropriate to this thread: http://www.control.com/post.php?id=1303993320 But, if we have the information correct, it doesn't appear that this control system has the ability to automatically switch from droop to isochronous. If the plant...

This response is really more appropriate to another, current thread: http://www.control.com/thread/1303904581 As you have stated, we can't know all the particulars of this situation, or if it's just a theoretical question. The poster didn't provide enough information to make any other...

> I will stick with my statement that this is not a Speedtronic problem but a > problem with the input devices or the output devices. I would also not rule out a wiring problem, but that's unlikely, though not unheard of.

WOW! As always with something like this: <b>When did this problem begin? After a maintenance outage? After an LVDT or servo replacement?</b> The Mark IV handles LVDTs differently than later versions of Speedtronic panels. One processor looks at one of the two LVDT feedback signals and uses...

I keep going back to the fact that you say you can transfer from gas fuel to liquid fuel while running and everything works fine, though you haven't told us what the exhaust temperature spreads are when running on liquid fuel. The exhaust temperature spreads when running on gas fuel and liquid...

<b>I would absolutely love to know how to calibrate the LVDT feedback from a device with no LVDTs.</b> There were several questions about the speed pick-ups and their gaps and their tightness and the condition of the toothed wheel(s) of the liquid fuel flow divider. So you've now...

Several things are not clear from this post, like if the plant is being separated from the grid when the problem occurs; in other words, is it being "islanded" and supposed to maintain frequency for the load which is also separated from the grid? If so, has the operation of the plant recently...

1.. For some reason the external reverse power relay sensed current flowing in the reverse direction. Perhaps there is a wiring problem, or some breaker was not in the indicated position. 2.. It is suggested that when performing tests like this (operations not typically performed) that you...

Thanks very much for the feedback!

Phil Corso, I would like to answer your question with a question, because the original poster didn't give us any more information than that there were two generators with their prime movers connected to a grid, failing to note (and I'm sure we'll never know the answer to this question) if...

RY, Thanks for the feedback. So the spark plugs seem to be working fine before firing on liquid fuel; it would have been interesting to know how wet the plugs were after the firing attempt. If there's too much fuel, or it's not atomized properly the plugs can be "flooded" and not work at...

The short answer is that the isoch unit will automatically pick up the load the droop unit was supplying and maintain the frequency. This supposes the isoch unit had the ability to pick up the load without exceeding its rated output <b>and</b> that there is no load sharing or power system...

You need to be working with OPC software vendor, in this case, Matrikon. One of their employees, Wassim Daoud, posts regularly here on control.com. I believe he has posted his contact information on at least one reply. So, if he doesn't respond to this thread you may try contacting him...

Wow. E1 is likely the generator exciter regulator. I don't know what the M in M PSS means, but PSS probably means Power System Stabilizer. GE's version of Historian is a separate, standalone PC running MS-Windows, TCI (a proprietary GE application), and OSI PI software. It will have a...

There's too little information to provide any assistance. It's <b>extremely</b> rare that vibration excursions happen without any previous event, such as an emergency trip from load or a maintenance outage (combustion inspection, hot gas path inspection, major inspection, generator...

GE-design heavy duty gas turbine exhaust temperature and the combustion reference temperature cannot be equated. TTRF, or TTRF1, are <b>reference</b> temperatures; they are approximations of flame temperature and not actual firing temperature, which is the temperature of the combustion gases...