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No. Unless someone has tried adjusting the null bias spring tension of the servo-valve, or unless there is some reason to believe the null bias may need adjusting, then the standard -2.667% (-0.2667 mA) per processor should be just fine. (Remember, some Speedtronic turbine control systems...

Hmmm.... Ummm.... Uhhh.... Errr.... The presumption is that you are talking about electrical load (MW) and not reactive load (KVAr or power factor). 660 MW is a pretty "substantial" machine. Depending on the size of the grid with which it might be connected, it's conceivable that...

markvguy hasn't been heard from in a while here on control.com. While I won't presume to speak for him, I will put my two cents' worth in on this question. The diesel is not producing sufficient torque to break the turbine-generator shaft away from zero speed during warm-up. Also, the...

It is suggested that you refer to wikipedia.org or use your favorite Internet search engine to learn the concept of head and its relationship to power generation. Once that water exits the faucet, it has essentially zero head, unless you have a large storage area that is located hundreds or...

You have not told us what work was done by the TA (Technical Advisor). Many times, one of the reasons that TAs are asked to return to site, or one of the things they are asked to while on site, is to implement different levels of password access/protection. (This is just another area that GE...

The generator (alternator) is a "stupid" device. It just converts torque into amps, and in the process can handle some reactive current. (I almost said power! But I did use an exclamation point! Oops, I did it again.) The alternator is driven by the prime mover; the reactive component is...

>Part - 1 : the Theory Vector diagrams are welcome. The question remains: How much does the speed of the turbines at your site change when they are loaded while connected in parallel with a other machines on a grid of relatively stable frequency? Even if the frequency isn't 50.0 Hz, how...

The generator doesn't hunt. The generator prime mover's governor will hunt if not properly tuned. And we're supposed to be talking about properly acting governors. Not laboratory exercises. When your plant is connected to the grid, if you start a large motor the grid will supply that power...

You need to tell us what what Process Alarms were annunciated prior to the start of the Off-Line Water Wash, and during the Off-line Water Wash. For example, what are: >07:37:41:093 1 Q 0380 >07:38:08:093 1 Q 0400 >07:48:25:093 1 Q 0093 >07:48:25:093 1 Q 0378 Without access to the...

We were, and aren't, talking about servos used for FD fans or rotary stirrers. The thread was about: >What is the correct procedure for calibration of >LVDT of GCV/SRV in Mark-VI machine. In the case of servos used for GE-design heavy duty gas turbines (as this thread regards), fail-safe...

This is a <b>HUGE</b> misconception, that one is calibrating the "servo" or the control element (control valve; IGVs; etc.). On a GE-design heavy duty gas turbine, <b><i>one only calibrates the position feedback device(s), </i>NOT<i> the servo or the control element or the hydraulic...

At a minimum, a continuity check could be done on the RG-58 coaxial cable (it has a single conductor running through the middle of it, and that conductor should be insulated from the metal BNC connectors at each end). Also, the multi-headed cable could be removed and a continuity check could...

The best resource to answer this question is the manufacturer of the generator or packager of the unit. I'm not aware of a formula, but engineers can devise formulas for just about anything. Since hydrogen is seven to ten times more effective at cooling a generator than air, the output when...

The below presumes that a GE-design heavy duty gas turbine is being operated at <b>part load</b> (i.e., NOT at Base Load). Many sites put in a Preselected Load Control setpoint greater than rated load (i.e., greater than Base Load) to drive the unit to temperature control (Base Load). (They do...

So, what makes you "... think [the two failed exhaust T/C readings] should not enter into calculation and should be excluded by the system...."? Is this something you read in a manual, or the way you interpreted the Combustion Monitor algorithm in the CSP? The Combustion Monitor block...

All questions are relevant; they all need to be answered for a reply. How often do you transfer fuels? Every start? Once per week? Once per month? How often does the unit start and stop? Every day? Once per week? Once per month? How long does the unit run once it's started? Half a day? A...

I missed the "short description" for this thread which only appears on the main page of control.com and says the unit is an Hitachi H25, which is something I have no experience with. Also, I mis-read the whole post because it talks about VSVO and Mark IV. I've never seen a Mark IV with a...

The length of the ignition timer is dependent on the application and sometimes on the fuel being started on.

So, this alarm is apparently related to the IGV LVDTs? What is the turbine at the site that is experiencing the problem? (Asked because a reference of 25.8 is not typical for most GE-design heavy duty gas turbines.) The reference is generated in the application code, and the feedback is the...

Well, I'm going to have to take exception to some of the material presented here. While the basic premise is correct, the drawings used to explain the concept along with the disclaimers about the drawings, and the math doesn't seem to work out. If there is a centering spring that returns the...