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belmehda, Why does FSR decrease to minimum during starting? It's been a long time since I've worked on a two-shaft, and the sequencing/application code might have changed, but if I recall correctly the transition from HP speed control to LP speed control occurred when the LP shaft broke...

Glad to have been able to be of help!

yasbine, Thanks for the clarification. There isn't much air flow at part speed, and if the unit is decelerating and there's no torque assist from the starting means and the speed drops below the point at which the turbine can sustain it's speed then the liners, transition pieces and first...

Himasnhu Khoriwal, It's simply not feasible to monitor #2 bearing vibration from outside the load tunnel. Your theory about heat is likely correct. There are vibration sensors, and then there are high-temperature vibration sensors. Of course, the vibration sensors cost less than the...

Himanshu Khoriwal, You say this occurs when the unit is on Cooldown. Can you relate some DC event that occurs during Cooldown with the power supply issue? Also, I think I'm beginning to understand the power distribution description you have been trying to provide. Most Mark VIs I have seen...

igvman, I had occasion yesterday to use a recent copy of Toolbox (11.7) and found the method to download the PC's time (from the BIOS clock) to the Mark VI. Go to Device, Download, View/Set Time. I think it's pretty similar for most newer Toolbox versions (since about v.9, I believe). Just...

Himanshu Khoriwal, I believe the 125 VDC is not being interrupted at all--but that the over-/undervoltage protection in the Mark VI power supplies mounted on the right sides of the processor racks are operating in response to a dip or spike in the voltage from the 125 VDC system. The power...

Michael Borrelli, (Many of the better gas turbine controls people are named Michael! But not me....) Excellent description of the various modes, and congratulations for fixing GE's convoluted buttons and descriptions. Isn't it amazing that two different groups in GE (the steam turbine...

Ayaan Alam, Most excitation systems ("AVRs"--Automatic Voltage Regulators) are pretty similar in how they operate. An excitation system provides (ultimately) DC current/voltage to the rotating generator field windings. There are "brushed" and "brushless" types of excitation systems. Brushed...

Yasbine, Are you saying that during the second attempt when L60BOG was forced to zero that the FSR did decrease from 32% to 12% and TNH did decrease from approximately 51% to something much less (more than 5% less) during the start attempt? Did you also trend TNL to see how fast it was...

EGACC, Generators are devices for converting torque into amperes; motors are devices for converting amperes into torque. Light bulbs are devices for converting amperes into heat. And computers, ..., well, computers are devices for converting amperes into virtual torque. ;-) Per your first...

igvman, Each HMI CPU (the PC) has its own internal clock, which is part of the BIOS (Basic Input Output System), and has its own battery (which needs replacement from time to time). Each HMI displays the time of the control system it is communicating with on the CIMPLICITY display--which...

Not that I'm aware of. And, it's likely only GE could tell from the serial number--but many cards didn't have serial numbers, either.

Please, what is "N.B."? <b>Moderator's Note:</b> Nota Bene Italian and Latin for Note Well. The spark plugs should be removed for testing and earthed/grounded before applying power to them. There are only four bolts to remove for each plug, and quite often the gasket is not damaged when...

Himanshu Khoriwal, Does the fused switch have some sort of automatic operating/opening means that is opening the switch, or are the fuses opening? Let's try this another way. When the 125 VDC is offed, how do you restore the 125 VDC to the Mark VI? Are you confusing the Mark VI with the...

Yasbine, I agree with glenmorangie--it sounds like the LP shaft is accelerating too quickly. The general mode of operation of a GE-design two-shaft heavy duty gas turbine is that--when operating at rated speed (LP speed, that is) that fuel controls LP shaft speed, and the second-stage...

Himanshu Khoriwal, Is the Mark VI a Mark VI or a Mark VIe? What Process Alarms <b>AND</b> Diagnostic Alarms which are being annunciated while the unit is on standby? When you say the 125 VDC supply is "getting off by itself ... while in standby in condition, ..." specifically, where is...

This is a difficult question to answer, even though it seems it should be very straightforward. But, here goes, anyway, ("Once more, unto the breach!"). Are you familiar with the power triangle? The kW side of the power triangle (the real power side) is a function of the amount of power being...

Try this: https://powergen.gepower.com/content/dam/gepower-pgdp/global/en_US/documents/technical/ger/ger-3568g-dry-low-nox-for-hdgt.pdf There are many types and styles of gas turbines (heavy duty; aircraft derivative; hybrid), and they probably all differ somewhat--especially since there...

Omair, So, the units burn liquid fuel and "only four units out of nine" have this problem--that's 44% of the units. And, the units experience a lot of trips. The problem has nothing to do with the 88TK exhaust frame blowers; it is occurring at the same time as the exhaust frame blowers are...