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It’s entirely possible that the unit you are describing doesn’t have a Mark* turbine control system. Further, if that’s true, then the programming is most likely not going to be exactly as I tried to describe. The fact remains, gas turbines running at or near rated load for a given ambient and...

Orifices are used for lots of different things, not just to develop a differential pressure in order to be able to measure flow-rate. They are also commonly used to reduce flow-rates to protect equipment. In this system, they are used for both purposes. The "bleed" valve you speak of, fabio9...

Do they have shish tawuk in Tabuk? This back-and-forth about the geographic location of the power plant is all well and great--but it adds nothing to the original poster's answer....

mariselvan, Hmmm..... Gas turbines and power output during grid frequency disturbances. As we know (because we all know this) generator speed is a function of grid frequency when synchronized to an "infinite" grid with other generators and their prime movers. So, as grid frequency decreases...

esganfia, What is the status of this issue, please? Enquiring minds would very much like to know….

CSR, Thanks VERY MUCH for the feedback!!! We are VERY HAPPY to hear you were successful. Sometimes the adjustment of 33CS needs to be made, and leaks may make it more difficult to reach the end of stroke/engagement. The important take-away here is: The torque converter and starting means by...

CSR, Thanks for the update. Please write back to let us know what you find.

oneye14, The Mark VIe is can use just about any power source--from 12- or 24 VDC to 220 VAC. (The "preferred" (preferred by the division of GE that designed and built the Speedtronic Mark* series of controls, including the Mark VIe) power supply is 125 VDC--because that what GE has for decades...

I just want to note that many times the quality of the responses received are directly related to the quality of the information provided.

I forgot to ask (because I usually regret asking...!): What Process Alarms are present or annunciated during the START attempt? Please list all alarms in chronological order--even the ones you don't think are relevant.

Taza, Welcome to Control.com! WHAT HAVE YOU DONE TO TRY TO TROUBLESHOOT AND RESOLVE THE PROBLEM? WHAT WERE THE RESULTS OF YOUR EFFORTS? WHEN DID THIS PROBLEM START--AFTER A MAINTENANCE OUTAGE? AFTER A TRIP FROM LOAD? WHAT KIND OF TURBINE IS THIS MARK VIe CONTROLLING? WHAT DEVICES ARE THE...

CSR, Does the diesel lose speed when it's trying to rotate the turbine shaft? Does the torque converter housing get warm or hot when trying to START the unit? It would be most helpful to see the Starting Means P&ID from the unit. There is often a solenoid-operated valve to control flow...

I wrote and submitted my assessment of the drawing above. I would be very surprised if the entire 52L breaker close circuit only contained those elements. BUT, that interposing relay could be the issue. Even if the Mark VI is trying to close 52L, if the synch scope is rotating faster than 4 or...

esganfia, That circuit is heavily simplified, and in my personal opinion is dangerous if the actual 52L breaker close circuit is that and that alone. Further, the interposing relay introduces a possibly significant time delay which could--under the right conditions--cause the signal from the...

I would agree with your analysis. I'm unaware of any ability to automatically select between multiple breaker close times in the Mark VI.

esganfia, What operating mode is selected on the Main (Start-up) display when 52L is being synchronized? Is it AUTO, or REMOTE (or some other name for "remote" control)? Are you 100% certain that R43SYNC_OFF is driven by something from the DCS (either a discrete (contact) input, or a signal...

esganfia, You're correct--there is no technical reason to use automatic synchronizing at all--even for the generator breaker (52G). Manual synchronization would work just fine. And, most grid operators/regulators will not permit a single automatic relay to perform synchronization--that's why...

A LOT of sites (try to) operate only using the DCS, whether that be via hardwired inputs/outputs and/or a combination of MODBUS or GSM AND hardwired I/O. A LOT of sites. They don't hardly ever look at the GE operator interface (HMI) and even less often look at the Alarm Window/Display(s). There...

I don't do "off line"--the beauty of this particular forum is that MANY people can benefit from the questions asked by one person, now and later (because the site is easily searchable). So, no PM or DM. Nope. If it's going too fast the Mark*'s 25A output will never close (too much slip). Okay...

To my knowledge there isn’t any websites for this. (Not free, anyway.) You may find some YouTube videos; some will be good, others not. While there isn’t much as far as details (with the exception of inspection reports), the Maintenance section of the Operations & Maintenance Manual is where...