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sudamadhav, I find myself waiting for a few hours today, and would like to ask why you are interested in armature reaction as a technician at a power plant. This is something which synchronous generator designers must understand when designing and building synchronous generators. As for...

bhol, Did this problem with the second generator just start, or has it been going on since commissioning? If it just started, did it start after some kind of maintenance outage? Why do you specifically suspect a reversed CT? Was that CT recently replaced, or was the wiring to that CT...

sudhamadav, Everyone has to start somewhere, so let's get started. All of these topics have been covered before on control.com, and it seems you have read some of the previous threads. It would be most helpful if you detailed the areas you would like to have clarified. For the issue of...

VKGUPTA, I took a few minutes and read your past posts. Seems like a lot of problems--and we've had virtually nothing from you in the way of feedback about any of them to know of the information that's been provided has been helpful, or not. It's suggested you contact a valve manufacturer...

Dear, You haven't provided much information about the valve (type; manufacturer (Young & Franklin; Woodward; Fisher; etc.), the turbine it's mounted on, the turbine control system (Mark I, Mark II, Mark IV, Mark V, Mark VI or Mark VIe), etc. Have you properly established Hydraulic...

rokan_123, Only GE can answer your question with any authority (correct and complete purpose). And GE in Belfort, France, has authority for determining how the Frame 9E machines are to be operated and controlled and protected. (And they have a pension for making things complicated and...

Dear Sir, This is question best posed to GE or one of its authorized packagers. GE also have several publications out regarding Modified Wobbe Index control system option which may have some information that you would find helpful. The thing I would most worry about is if the deviation...

job2004/Eddie, Most exciters (sometimes called AVRs) are set up to produce a particular voltage when the generator-set reaches rated speed just prior to synchronization. This is commonly called the Off-Line Voltage Setpoint. It is typically set to the nominal rated voltage of the system with...

Okay, Jimbo76, Mark IV. Dual fuel. Runs mostly on gas fuel. No problems starting on gas fuel, except for a similar problem a few weeks back. Dual fuel machines that don't run very frequently on liquid fuel are prone to lots of check valve problems--liquid fuel check valves and purge air...

Hey, When did this problem start? Just recently? After a maintenance outage? After a trip from load? The purpose of this question is to understand what, if anything, might have changed recently (like new fuel nozzles installed during a recent maintenance outage). What kind of duty does...

Hi, If these two posts were found to be not helpful, it would be helpful to me (the author) if I knew why they were not helpful. I'm always trying to improve my explanations--many times at the sacrifice of too many words--but I also try to anticipate future questions and I'm always cognizant...

GGN, Is the DG supplying a load independent of a grid or other generators? If so, it's not really possible to change the power factor at the generator--the power factor is a function of the characteristic of the load (motors; lights; televisions; computers; computer monitors; etc.)...

Bob Peterson, I would agree, except that the original poster stated these threads are under about 1000 psi. I have seen large springs on various valves which kept decreasing pressure on the threads of the bolts use to compress them as the bolts were being loosened (and which applied...

job2004, We presume you are referring to automatic synchronization.?.?.? Does the automatic synchronization feature have a voltage matching function--that automatically makes generator voltage equal to or slightly greater than grid voltage? When synchronizing it's customary to make the...

RotoMan, The 24 hours is to allow the shaft to deflect (sag) as it will under its own weight when it's hot and the metal temperatures are in the elastic range. As the shaft cools, it will actually begin to straighten--though it won't return to exactly straight. Some time on turning gear (a...

Frank, From your other thread, if the 24 VDC is truly floating then it's reasonable to fuse both phases (legs) of the supply. If the negative leg were grounded, one would not need to fuse the negative leg, only the positive leg. It would seem the supplier is trying to protect the floating...

Frank, There are no hidden diodes in the circuit as shown--just as there were likely no hidden diodes in the light circuit you described. The only difference from the circuit shown and the one in Speedtronic turbine control panels is that there is a physical "jumper" which can be used to...

Oh, nikkumnit, You've fallen victim to the ivory-tower nonsense printed in a LOT of textbooks and references about Droop Speed Control and full load speed and no load speed. There has been an awful lot written here on control.com--so much that sometimes it feels like it should be...

Frank, Quote from my first response to this thread: "...They use a voltage divider network to reference the DC supply to ground in order to monitor for grounds on either leg (phase) of the DC supply." >Won't the voltage divider have to be grounded to earth in >the middle to maintain...

sggoat, The original poster hasn't said what Frame size machine was involved. I've personally never seen an F-class turbine which ran above 6 or 7 RPM on turning gear--and he said it went to 20 RPM and then coasted back down. I also don't think the original poster is going to write back...