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sardar9, The hydrogen-cooled generators at your site are considered to be 7H2 generators (they are Frame 7E/EA hydrogen-cooled generators). A 7FH2 generator is a hydrogen cooled generator driven by a Frame 7F turbine.

For the majority of GE-design heavy duty gas turbines with ratchet mechanisms for cooldown operation (including the self-sequencing ratchet controllers), L33HRF is a logic "1" <b><i>at the </i>END<i> of the forward stroke, and </i>REMAINS<i> a logic "1" until the ratchet reaches the end of the...

G.Rajesh, 63FD-2 is a pressure switch that is connected to <QDn>, which means it's "fanned out" from the DTBA or DTBB terminal board to all three control processors. So, calibrating the switch wouldn't have any effect on a single processor's value for that discrete input. Downloading would...

Anees, Thanks for the feedback!

Increasing the turbine inlet temperature isn't just something one does without risk. You should ask the OEM, or another reputable engineering firm, if they can calculate the effect. 100 deg F (or C) is a LOT of increase. It would likely result in a highly accelerated decrease of hot gas path...

Umm, there's like this big source of fuel in the Frame 6B Load Compartment, called the Load (Reduction) Gear. And a lot of high temperature metal (the back end of the exhaust). Combine an oil leak from the Load Gear (happens when people ignore increasing or high Load Gear vibrations for extended...

What was the "zero-stroke" LVDT voltage, the voltage when the LVDTs were fully closed against the mechanical stop? If it was more than approximately 0.700 VAC RMS then it would cause the 0% and 100% values to be elevated from normal. And what's in the Control Specification for LVDT...

As usual, G.Rajesh, you haven't provided much in the way of information. Is the Mark V a TMR or a SIMPLEX panel? Why would you think that checking the calibration of the switch would have an effect on the value seen be a single processor (I'm presuming the panel is TMR)? Have you tried...

John Emery, Thanks very much for the offer! I believe that "Feedback is the most important contribution!"(c) here at control.com. It would be beneficial for other users of this forum to know what users of Controls Connect think of the information available there, and of the help received...

I think the original poster neglected to tell us that the formulae above came from the CIMPLICITY displays. GE has this really annoying "feature" of the Exhaust Temp display that causes an individual T/C's bar graph to turn yellow or red. And many operators believe that the Speedtronic should...

calvein, Thank you very much for the clear response. I have not seen, nor will I probably ever see, all of the various configurations that were used on GE-design heavy duty gas turbines over the decades they have been produced and sold. I have very recently (not on control.com) believed...

otised, Thanks; that's a new one for me! Did the Trip Oil pressure provide the force for opening the Liquid Fuel Stop Valve? Or, was it like newer Frame 5s that used the Trip Oil pressure to operate a dump valve to allow high-pressure hydraulic oil to open the Liquid Fuel Stop Valve...

While it's not okay, we're becoming quite accustomed to people not providing sufficient information and asking completely unrelated questions when they mean to ask something entirely different. On the unit under consideration, where does the Trip Oil system get its pressure/feed from? The...

+1

Dr. Price, Your last sentence is the most concise answer to the question. A control valve controls flow-rate. A control valve can be operated by an electric motor, or is can be operated by a pneumatic actuator, or it can be operated by a hydraulic actuator, or it can be operated by a servo...

It is suspicious that the unit is above 80% speed, but you probably didn't tell us that this is a two-shaft or aero-derivative unit. Please provide an example of no data by posting the "empty" Trip History.

It would be easiest to use an infrared heat gun to check the temperature of the piping on both sides of the bleed valve when the unit has been on line for some time. If the valve is fully closed the temperatures should be relatively low and equal. And if the valve is leaking it's pretty likely...

You didn't say what fuel the unit was running on when hydraulic pressure was lost; so, I'm presuming liquid fuel because you only mentioned the Liquid Fuel Stop Valve. (But I have a suspicion the unit has an electric gas fuel control valve, with a pneumatic gas fuel stop valve.) You also...

Induction motors do not require excitation current/voltage.

Don't make this harder than it is. It's a very simple sort and comparison, though there is some scaling. Unfortunately, I can't see the Speedtronic elementary you're looking at, but while there is a box inside the algorithm that probably just says "SORT: HIGHEST TO LOWEST", that's all it is...