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Process Value, The more I read the first section of the document the more it reads like explanations from some Woodward manuals.... including the charts and figures. And the more I read the second part the more I fear even more questions and problems when people start willy-nilly trying...

Way too many mis-spellings and problems with the information provided. The PTBA card is the I/O terminal board for the <P> core, which contains the TCEA cards (three of them), the TCEB card, and the TCTx card. The TCQE is a pretty special analog I/O card which is used with proximity-style...

I've seen this problem twice before; once it resulted in a fire when the Customer refused to reduce the reactive load on a hydrogen-cooled generator and the vibrations increased to the point that the hydrogen seals were damaged, hydrogen leaked out and caught fire. Very nasty situation. In...

There are hundreds (literally) of GE-design heavy duty gas turbines around the world which do not have an AC motor-driven Auxiliary Hydraulic Oil Pump. For these turbines, they usually crank the unit to obtain Hydraulic Oil Pressure for purposes of stroking devices which use electro-hydraulic...

What have you done to try to troubleshoot the problem, and what were the effects of your efforts? Is this a new unit undergoing commissioning for the first time? If this is a new unit, are you certain all of the valves in the Hydraulic Supply system are in the proper positions? Is there any...

Ayed, Excitation is required to produce terminal voltage on a synchronous electrical machine (an alternator). The amount of terminal voltage is directly proportional to the amount of excitation. Depending on the type of "main" or "primary" exciter used on alternators, sometimes it's...

Because for the average consumer the power utility factors into the price per KWH the price of the reactive power. For very large industrial plants with lots of inductive loads (induction motors, primarily) power utilities do install VAr-hour meters in addition to the Watt-hour meters, and...

Process Value, This is basically a good work, and I have several comments. You have used examples of droop in the beginning of the document that talk about reducing speed reference as load is increased. That's <b>one</b> method of implementing droop. Then in the second section of the...

Because, in general, the motor is only used briefly during start-up on liquid fuel and not continuously while operating on liquid fuel. Many liquid fuel flow dividers do not have these motors at all. They are usually only provided when the liquid fuel viscosity can be very low (such as when...

Hello! <b>When did this problem start?</b> After some outage? Is this a new unit? <b>What have you done to try to troubleshoot the problem?</b> And what were the results of your efforts? Reverse power is generally sensed by the "direction" of current flowing at or near the generator...

KKK, Axial compressors are odd beasts; they don't always behave as expected. As anyone who follows my posts here on control.com knows and will attest to, I am not about the maths of most processes. So, I'm not going to try to pull out my university thermodynamics texts to analyze the...

Mohamed Salem, > pls tell me what can i do for this problem. Speaking for myself, you have asked several questions on control.com previously and have not provided the requested information nor have you provided any feedback about whether the information provided was helpful or not. And...

Process Value, You are correct; GE does not publish critical speed data for their heavy duty gas turbines. Again, GE-design heavy duty gas turbine rotors are balanced to reduce the criticals to the extent possible, AND the Speedtronic prevents control of speed below 95%, which means there...

Oh, you want to be really, really careful when using the words 'reactive' and 'power' together in a sentence on control.com. As for how "it" affects fuel consumption, it doesn't--for all intents and purposes. Fuel produces torque, and torque is used to produce real power (watts). That...

What part of the reply to your previous posting about this problem did you not understand? http://www.control.com/thread/1306407234#1306428361 You said you change the main DCC PROMset, but that's not a "PROM" upgrade. I believe the PROM upgrade for resolving the nuisance IOMA power supply...

Demigrog, Thanks very much for the information! It's good clarification. Is any of this available in Mark VIe Documentation? GEHs? GEHTs? GEIs? Thanks again!

Fai, You are using symbols and terms I am not familiar with at all. You said "gas manifold" which to me means the ring manifolds around the axial compressor case for the various gas fuel nozzles. The outlets of the control valves directly feed the ring manifolds and "pigtails" connect the...

Great questions, all. I believe in versions of Mark VI- and Mark VIe HMIs with CIMPLICITY that use TCI, it's the way that TCI gets information to and from the Speedtronic. Because, in those HMIs it's my understanding that CIMPLICITY does not communicate directly with the Speedtronic; it does...

Using the Mark VI Toolbox or Mark VIe ToolboxST feature to stroke and calibrate servo-operated devices equipped with LVDTs does not require changing regulator types. Once the LVDT calibration is completed with Mark VI Toolbox and Mark VIe ToolboxST I believe all that's necessary is to upload...

It's not clear if you're asking about some condition that's causing the gas manifold temperature to change (increase or decrease) or if you are trying to understand the effects of applying heating or cooling to affect a change to the manifold temperature (and hence the gas temperature inside the...