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When two generators are synchronized to each other and not to a larger grid, if any part of the load is reactive then the excitation systems of the two generators can be used to make the two generators split the reactive load, or have one generator take the reactive load. In my experience...

I would like to add to the good advice above, that, at its simplest, removing one of four conductors will result in the remaining three conductors having to carry the same current as the other two phases with four conductors. That may require operating the prime mover and generator at less than...

Roberto, Excitation is very much like watts (kW; MW). When a generator and its prime mover are connected to a large ("infinite") grid, there is an unlimited amount of load (watts/kW/MW), AND an unlimited amount of reactive load (VArs; kVArs; MVArs). So, when the generator is at rated speed...

Roberto, >One doubt remain. Reading your explanation it seems to me >that if the grid is very powerful (big generators >synchronized all together that almost nothing could perturb >from their constant revolution) the grid will force the >generator newly connected to the speed proportional...

This "drawing" is NOT to scale; it's just to give you an idea of how the LVDTs that GE typically uses on their heavy duty gas turbines work.<pre> LVDT |<-----------LVDT Linear Output Range----------->| LVDT Non-Linear | | Non-Linear...

JeffersonAirplane, Thank you very much for the kind words. I'm working on another post at the moment, but will respond to your latest questions soon.

How could this reply have been more helpful (to the person who gave it a thumbs-down)? I have struggled with trying to explain this before (more than once) and I'm open to any suggestions or constructive criticisms. If I've made any errors with physics, I'm open to corrections. But, it's...

sunilak, You should know that operating in Lean-Lean Positive (or Extended Lean-Lean) for prolonged periods of time is NOT recommended by GE. Because there are large diffusion flames in both the primary- and secondary combustion zones, this causes high thermal stresses on the combustion...

To mitigate the effects of increased seal oil flow-rates causing decreased hydrogen purity, that would be done by increasing the hydrogen scavenging flow-rate. That may not have been clear from my previous reply. Sorry for any confusion.

Yaseeen, Here's a link to a good thread, with some good (and bad) comments above and below the crude drawings of proper drain wire grounding: https://m.control.com/thread/1414703336#1414703336 It was found by typing:<pre>+"drain wire"</pre> into control.com's Search function (it was the...

vijaycontrol, >1. What may be the reason for increasing of AFPCS value >During raining.(Normal value showing during no rain) >Whether raining will affect the ambient pressure? Have you checked the inlet air filters to see if they are wet? It's probably because the inlet air filters are...

A. Sandoval, Thanks for the feedback. Ron? Ron Who? It is also important to remember: As seal oil rings wear--and they DO wear (they are purposely made of brass, which is a soft material--softer than the generator shaft metal), the scavenging flow-rate(s) will have to be increased to...

vkgupta, You have identified the most critical control devices which would be affected by water in the oil (lube oil and hydraulic oil). You should flush the servo-valves with good oil to make sure they are okay; if it was just the period of cooldown operation and cranking they are...

yaseeen, Yes, improper grounding of twisted, shielded pair drain wires can definitely cause problems with signals. Though if the unit has been running for some time and this problem just started, that would be odd (unless the wiring was disturbed recently, such as during a maintenance...

JeffersonAirplane, >Ok, but what will keep the frequency of one generator >"linked" to that of the other one or as you say of the grid? Magnetism. The forces of magnetism keep the generator rotor spinning at the speed that is proportional to the frequency of the AC current flowing in the...

sunilak, I'm not exactly 100% clear on precisely what is happening, but here's my input. If flame is truly being lost in one or more combustors while in Premix Steady-State mode, then the exhaust temperature spread(s) will also be high (probably because the diffusion flame in the secondary...

Mohamed nawar, The maths aren't boring. I don't much like maths as an answer to a question because it sometimes muddles the answer and the question. But mostly, I prefer when people do the maths themselves and ask for clarification if needed. Personally, when I work through an answer...

CRANK cooling, or as it's sometimes called, forced cooling, is best accomplished by trending the wheelspace temperatures during CRANKing. You will observe at the beginning of the crank cooling the wheelspace temperatures will drop fairly rapidly, then over time they will level off until they...

DBONEILL04, Pre-Selected Load Control was never meant to be used as a "full-time" operating mode; it's just that operators believe (for no known or logical reason) that if the unit load isn't being automatically controlled that it will drift willy-nilly, which simply isn't true. Before...

TheGingerBeer, Thank you very much for the feedback!