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sudhmadhav, > 1.the pump was running for long hours on that day, couldn't able to > collect the info about it. Was the DC ELOP being used instead of the normal L.O. pump(s) to allow turbine operation (such as prolonged turning gear operation or fired operation)? Running a DC motor...

Phil Corso, If you had answered my question from above (the one operators always ask me), But, you haven't. And I'll bet dollars to donuts that it's the same question that sudhamadav is trying to get to, as well. So, you might get a thank you from him if you could answer the question...

sudamadhav, I've re-read Mr. Corso's summary of his armature reaction paper, and I actually think he and I agree--just that my explanations are much more simplistic and don't involve air gaps and the various and sundry EMFs and such--none of which can be measured (they're all mathematical...

I missed a couple of good opportunities to provide some more clarification on a couple of issues. The original poster mentioned the grid frequency was "fairly stable" during the MW hunting, but then also says the Actual turbine Speed (TNH varied between 99- & 101%). For a 50 Hz grid, 99%...

bkarim55, One more thing about second-stage nozzle LVDT calibration: just like SRV LVDT calibration, it's not critical. This is because both are not just position loops; since the SRV is used to control P2 pressure (but primarily as the gas fuel stop valve) it is moved to whatever position is...

sudamadhav, Please define how long the DC ELOP was running before "...it got burnt..." Please describe where it was "burnt"--the field, the armature/rotor, the brushrigging/commutator? Just the leads in the motor's junction box? When was the last time the ELOP was run? Is it started and...

This primary purpose of this post is to describe what happens when Pre-Selected Load Control is used to maintain load (electrical power output) during Part Load operation of a GE-design heavy duty gas turbine. Many of the principles involved are applicable to most, if not all, prime movers and...

manojbaral, Generator designers and manufacturers each have their own criteria which result in various voltages being used for excitation of generators with exactly the same rating (kW; KVA). And many hydro turbine-driven generators are used for voltage- and VAr support, so the excitation...

vinayak_paranjape, > The load variation was for significant time. Define the significant time: 3 minutes; 9 minutes; 27 minutes? Also, you say the speed fluctuation was observed in the field. Did someone actually use a tachometer (contact or non-contact type?) to physically measure the...

vinayak_paranjape, There was a feeling about this thread which caused me not to post immediately.... There was just a "tone" which was foreboding. Look--there are some physical locations and conditions on grids that are very "soft" and therefore the frequency and voltage can vary much more...

Sardar99, There are (or at least there were) some extremely knowledgeable Instrument & Control Technicians at your site. Have you asked them for an explanation--using the HMIs at site would be much easier to explain this than with words on an Internet forum where we can't post snippets or...

bkarim55, VIEW2 usage and recommendations have been posted several times before on control.com. It's also documented in the Mark V Maintenance Manuals, GEH-5980. I still believe there are two separate problems--possibly related. And, as I've been thinking about this issue, it's more...

barindra75, Have you looked at the AA P&ID? There is usually some continuous blowdowns in various places of the AA system--low points, in particular, but the AA piping usually rises up to the Booster AA Compressor, then back down to rejoin the other AA piping. Have you checked all the...

There's been no mention of second-stage nozzles in this thread. Does the unit have fixed or variable second-stage nozzles? Are the second-stage nozzles stable or are they also fluctuating? On a two-shaft GE-design heavy duty gas turbine with variable second stage nozzles HP speed (TNH) is...

g.rajesh, By way of explanation and detail, the CDB signal FQG is assigned to accumulator 24 in TOTT_Q.SRC; that's how the gas fuel flow-rate gets "accumulated" to represent total flow from flow-rate. The integer 24 in the comment column after the semicolon at the far right of the TOTT_Q.SRC...

Maythem, Dust/dirt by itself isn't really the problem when it comes to axial compressor cleanliness and throughput (though eventually it will become a problem). It's the combination with humidity that results in the "coating" of the axial compressor blades (rotating and stationary) that...

g.rajesh, I have limited time at this writing, and I didn't see your reply above. (Thanks for the complete information!) UNITDATA.DAT's file date/time stamp only get changed when MK5MAKE.BAT is run (or when someone runs the executables called by the batch file to create a new...

serpenson, The formula which describes the frequency produced by a synchronous generator when it is NOT synchronized to a grid is:<pre>F = (P * N) / 120 where F = Frequency (in Hertz) P = Number of poles of synchronous generator rotor (always an even number) N = Speed of rotation...

Saied > Try this thread--particularly Bruce Durdle's and nic's > comments; especially nic's comment with the formula: S=P+jQ. Seems I forgot to include the link.... http://control.com/thread/1360687812 nic's excellent response was made on 12 February 2013. Actually, Bruce Durdle's...

I had to look up VPI, and here's a very informative link: http://www.electricmachinery.com/about-Duraguard-VPI-Insulation.html I would say that as long as the water was fresh, not salt, and that it wasn't dirty or contaminated, and it didn't stay in the machine for very long (wasn't...