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ABDI, Most sites send their fuel nozzles out for refurbishment and flow-testing. Qualified shops will have the proper equipment and test procedures. Be aware that if you find blockages in the secondary/tertiary fuel nozzle orifices of the secondary fuel nozzles that most of them have to be...

Fathi Hadloul, An over-excitation limit alarm means either the field voltage or the field current is excessive for the operating condition. What kind of excitation system do the units have? The same on both machines? Were there any Diagnostic Alarms on the excitation system? Was any...

Craig, Every site is not the same. It all depends on what was bought, what was sold, and what was delivered relative to the other two. Anything other than that should be accompanied by a purchase order. It would certainly seem unusual that the "switchgear" (the Motor Control Center motor...

SSU, You're welcome, and I'm glad to be of help. I think Mr. Corso's reference should help to understand backcharging, as well as 309EGuy's response. As for the other thread, thanks for the feedback. I'm hoping this well get some people started on their journey of understanding. Because...

Ahmed, You're welcome, and glad to be of help. And thank you for the feedback. It's always good to hear if the information provided was useful--or not. Sometimes it's difficult to understand exactly what the question was, or we just don't have enough information to be specific. So, thank...

Neo, I don't believe you've told us what turbine you are working on at your site.... And what fuel(s) it burns.... And what kind of starting means it has.... Your next assignment is to examine L3RS. Post the rung, and the logic signal names from Toolbox, and write your sentence of how the...

Neo, This is a good start. Please do be careful when "copying" signal names; if the signal names is in all capital letters in Toolbox, you should use all capitals in your post. If the signal name is in lower-case letters, you should use lower-case letters in your post. And, please...

SSU, A "dead bus" is defined to be a bus that has no current/voltage from any source to power the load(s) that is(are) connected to it. In some plants there is a tie-line breaker downstream of the generator breaker(s) which connects the output of the plant with a larger grid and other...

Neo, Okay! Let's get started. First, some "back-room" stuff. In order to post rungs so that they're legible on control.com we have to use HTML tags, specifically, the 'pre' and '/pre' tags (enclosed by the < and > characters). The 'pre' HTML tag needs to be added to the reply Text immediately...

Ahmed, Remember that even though a "dead bus" doesn't have any current flowing there can still be a load or loads which are anxiously waiting to be powered and which were not isolated from the bus or shut off when the bus went dead. These loads may be immediately energized as soon as the...

disco, I'm always curious when I hear people say their islanded units are always operated in parallel in Droop mode with no unit in Isoch mode, or when they say their islanded units are always operated in parallel in Isoch mode. The only way this could occur is if there is some kind of...

William Monson, SMART transmitters are NOT recommended for: 1) P2 pressure sensing 2) CPD pressure sensing They just aren't fast enough--especially for CPD monitoring for F-class GE-design heavy duty gas turbines. The Ametek units have been known to be plagued by drift problems, but...

hi, What kind of turbine--gas or steam, or ??? Any turbine used to drive a load (generator; compressor; pump; etc.) must be able to deal with a sudden/complete loss of load in order to prevent over-speeding. The way each type of turbine does so can be very different, and can even depend on...

Neo, Welcome to the business. Mark V turbine control panels employ what's formally known as the CSP--Control Sequence Program. Mark VIs (and Mark VIes) employ what's formally known as "application code." Both are terms for the application-specific sequencing, the "logic", that's gets...

Hi Ugene, And welcome to the power generation industry! Even if it's only for a summer. I presume you are working with large synchronous generators, and not asynchronous (induction) generators, and my discussion below is for synchronous generators--not asynchronous (induction) generators...

AliAdil, The Mark VIe is definitely capable of synchronizing a second breaker, but that requires some additional synchronizing circuit components and usually some kind of "switch" or selector, either on the HMI or on an operator station/console or a generator control panel to activate the...

Thank <b><i>you</i></b> for the feedback! "Feedback is the most important contribution!"(c) here at control.com.

<b>CORRECTION:</b> > If two units are synchronized together and supplying a load they will fight each other to try > to maintain frequency--and the fight is VERY ugly, with violent load swings and > likely breakers tripping and black-outs. It should have read: If two...

Hi, disco, There are many descriptions of Droop speed control that use the word "share". Share can be interpreted to mean several different things. In this context, "share" means that units operating in Droop speed control will not try to hog all of the load or give up all of the load when...

Hi, disco, If only two generators are synchronized together and sharing the same load then one generator should be operating in Isochronous speed control and the other should be operating in Droop speed control. In this manner, the Isochronous unit will adjust its power output automatically...