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Apollo, I've commissioned scores of GE-design heavy duty gas turbines, and participated in many performance tests of both new and existing units. Granted, I've been out of the field for a few years now but I don't things have changed very much. In my experience, the larger "Frame" units...

Mark, You have not told us <b>WHEN</b> this problem started (which is VERY important information). <b>Unless all the turbine control systems have some kind of Isochronous Load Sharing scheme which allows them to stably control frequency, then it's very likely the chosen operating modes are...

If the unit is operating on a grid of some size with other units and the speed is fluctuating then the grid frequency is fluctuating. And the P2 pressure reference will also fluctuate as the speed fluctuates, and if the gas fuel supply pressure isn't very stable to begin with then the problem...

Abdollah, You are welcome. Please write back to let us know where you found the battery ground. Remember: The Speedtronic is monitoring EVERY device connected directly to the battery--not just the devices connected to the Speedtronic. A ground can occur in the Emergency L.O. Pump motor...

Rudy, You are welcome, and, yes, I anticipated there would be more questions. I have yet to find a really good mechanical analogy to AC electrical systems. I think Bruce Durdle's reciprocating engine with springs for connecting rods is as good as I've heard. Coming from primarily a...

Abdollah, I presume you are asking if a turbine should be allowed by operators and supervisors and management to run with a battery ground, not if the turbine control system will "allow" the turbine to run with a battery ground. The unqualified answer is: Yes. The turbine can and will...

I can feel the heat of the flames already! > It is a true testament to engineers and the early designers of electrical systems that they operate > without too much human intervention and that today's control systems don't require a high level of knowledge or expertise. Control systems (of...

Umm, ..., er, ..., You seem to be saying that prior to the "linking" of a new Emerson Ovation DCS with a GE Mark V HMI data had been transferred via GSM (GE Standard Messaging protocol) to some other DCS. And that after re-connecting the Ethernet cable from the previous DCS to the new Emerson...

Rudy, Good questions, and some good statements. Where to start...? I want to preface the below by stating most of it is theoretical and doesn't take into account a lot of real-world factors, but that doesn't change the facts or what happens on AC power systems ("cause and effect"). I...

Thair, I forgot to ask: When did this problem start? If so, what changed before the problem started? Was more load added to the AC equipments breaker? Is the Huge LED Display newly added to the DG output? Do you have any nameplate data on the LED display? Such as current draw, power...

Thair, It would seem that you are starting the diesel generator with all the breakers closed (ON); is that correct? At what speed is the main AC breaker tripping?

sb, I have three questions and a request. First, what is the gas fuel P2 pressure during Firing (the pressure <b>down</b>stream of the Stop-Ratio Valve)? Second, what is the P2 pressure at 100% speed? Third, what is Firing Speed (Control Constant value TNK14HM1) at your site...

Sanjay, Try this thread: http://www.control.com/thread/1357456773#1357499785 It's just as applicable now as when it was written.

It's not as simple as best or worst, or most expensive or least expensive. Excitation systems are designed with many parameters in mind, such as the ability to "ride through" certain types of faults, or not, as the case may be; and to provide voltage support in certain instances. The choice of...

Okay; now I'm worried (not that I wasn't before). Generator terminal voltage is a function of generator field flux and speed. Speed, for a synchronous generator is constant regardless of the turbine power output. (I hope the turbine you want to couple to the generator is rated for the...

Govind, <b>When did this problem start?</b> Has it been happening since the original commissioning, or has it just recently started? What type and size (current rating) is the MPCB (Main Power Circuit Breaker???) is in use in the drive line-up incomer panel? How many phases does the...

Wahidul, I found an electronic copy of a Mark IV Speedtronic Elementary on an old hard disk; most Mark IV Elementaries were very, very similar, but some were slightly different. This should help you in your search. On Sh. 30J there is a block called MK4_L3GFLTV1_00XX, 'Gas Fuel Control...

A generator is a device for converting torque into amperes. (And a motor is a device for converting amperes into torque.) If you have a device which is capable of producing more torque than the generator can convert into amperes then it's very likely the generator will be damaged and/or the...

Wahidul, We are telling you there are three conditions which can cause EITHER a SRV fault, or a GCV fault, and then there's the GIV fault. Any one of these seven (7) conditions will cause L3GFLT to go to a logic "1". You are ONLY looking at the general, aggregate alarm (L3GFLT) for any of as...

s. buqain, If you're working at the plant where the turbine is located you should have access to the manuals supplied with the turbine which would have the best documentation for that turbine. If the turbine was packaged and supplied by GE, then in Vol. I of the manuals you should find a...