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WalterCTPL2019, Here's my questions. You keep saying you changed the sense of a contact in the "PSS rung" from NO to NC. SPECIFICALLY--What rung did you change? (Please post a pic of the rung you changed, and note which contact you changed the sense of.) SPECIFICALLY--Which CSP segment was the...

WalterCTPL2019, How many operator interfaces do you have on site, and which one did you use to make the change? Which HMI did you use to observe the state of the rung L59B_ALM? Have you looked at the state of L59B using the Logic Forcing display? If so, what was it when L59B_ALM was a logic...

For some strange reason, I didn't see that last paragraph when I read the askm238's response this morning. And, to the moderators, I don't know how to capture it because when I first read the thread I don't know something's missing (like the last paragraph, sometimes two). This isn't a one-off...

Sirtaurus12, This really should be a separate, unique thread.... GE used two-coil servos (for older turbine control systems--Mark I Speedtronic; Mark II Speedtronic) AND for SIMPLEX Mark IV (which was an upgrade product--never provided on a new unit), and for SIMPLEX Mark V (which was also an...

aksm238, I don't think you really understand GE-design heavy duty turbine controls. And, I highly suspected the unit were burning Naphtha but you allowed me to continue with my supposition they were burning natural gas. This is another HUGE difference--Naphtha uses a liquid fuel delivery system...

Twenty Questions, anyone?

yawadu, MOST field temperature values are the result of calculations done by the generator excitation system (commonly called the "AVR"). Because it's really difficult to read sensors on a piece of equipment that's running at 3000 RPM, or 1500 RPM. So, based on the known resistance of the rotor...

Indy, Is the earth core terminated to earth at one end or both ends? i have seen cases where one end of every spare conductor is terminated to earth, austensibly for personnel safety reasons. That’s taking safety to a pretty extreme level—in my personal experience. But that was site practice...

aksm238, Something about your query has been bothering me, and I might have discovered why. You want to turn IGV Temp Control OFF to reduce fuel consumption which will reduce exhaust temperature for a given load, and then add RFG to raise the exhaust temperature back to what it was. Is that...

askm238, I don't think the difference in fuel is significant. The heat rate goes down when the unit is operating in Combined Cycle mode. The gas turbine efficiency goes down, but the overall plant thermal efficiency goes up because of the increased steam production and temperature. I'm sure...

GE-design heavy duty gas turbines supplied with Mark* turbine control systems are provided with a document called the 'Control Specifications.' Prior to Mark V, there were three parts of the Control Specifications: Control System Settings, Control System Adjustments, and Control Sequences...

aksm238, When operating at Part Load in Combined Cycle mode at a particular load the fuel consumption will be slightly higher than when the turbine is being operated at the same load in Simple Cycle mode. That’s because the air flow is being restricted by closing the IGVs to increase the...

Arjun075, It's to ensure the turbine control system doesn't experience any grounds (earth shorts). Or maybe it's to prevent any sagging of the casings (axial compressor, combustion wrapper and turbine shell casings) at the bolted joints so that upper casings can be lifted off without binding...

" ... PAC answers that no restrictions for IGV temperature control mode change over is very undesirable." That's a double negative. " ... no restrictions ... is very undesirable." So, the PAC is trying to say that restrictions are desirable? There SHOULD be restrictions on IGV temp control...

Sitúa, THANKS VERY MUCH FOR THE FEEDBACK!!!

VTScada from Trihedral in Canada. Excellent software and user interface. Comes with all kinds of native drivers for most all of the major OEMs to communicate directly, as well as OPC. Extensively used in the water treatment industry and Ontario Hydro uses the software in the power generation...

I'm wondering how this is controls-related .... The vibration in the gearbox is high; we don't know if that started before the damaged tooth, became worse after the tooth was damaged, or ??? Regardless, how is this controls-related? And, if there is an issue with the speed of the gearbox, it's...

Sirtaurus12, This is going to be difficult to answer, but I'm going to try. If the problem were related to the purge valves and purge valve limit switches and the purge pressure switch there would be Process Alarms to that effect. So, unless you are seeing Process Alarms related to the purge...

This topic is one I'm not an expert on; I just follow the line on this (denser air produces more power at Base Load) and my experience (denser air produces more power at Base Load). I've seen it happen. Load a unit to Base Load, let things stabilize (an hour or so; longer is better). Turn on the...

hsingkui, [Questions usually end with a question mark... " So my question is that if several flame detectors are abnormal at the same time (only the detector fails), it will cause the generator to trip! ..." (Emphasis is mine.)] I know people intensely dislike this response, but we can't know...