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NFinch, What would be the purpose of operating a heavy duty gas turbine in this way? Presuming the IGVs would be modulated by the turbine control system the airflow through the machine would always be in the same direction—from the axial compressor inlet, through the axial compressor and the...

A "screen" is a shield--the foil (usually; sometimes it's a braided, stainless steel mesh surrounding the twisted conductors). The screen, or shield, should ALWAYS be grounded/earthed at one end--and one end only. (This topic has been covered MANY times on Control.com; and there were some very...

mirak, When did the problem begin? Is this a new/newer unit that has always had trouble synchronizing? Are you trying to synchronize to a large utility grid? Is the utility grid stable (meaning is the frequency stable)? Are you trying to synchronize to a captive power island (isolated from a...

Amanat Hossain, Is this the first time you have tested the DC pump running solo and noted this problem? Are the AC and DC Seal Oil Pump motors rated for the same kW/horsepower? Are the Aux. and Emergency Seal Oil Pumps the same pump? What is the speed of the DC Emergency Seal Oil Pump motor...

Benz_v, 1. L52QA is the status of the Aux. L.O. Pump Motor Starter contactor; logic "1" means the motor starter contactor is energized and supplying 3-phase power for the Aux. L.O. Pump Motor 2. MOST GE Mark V turbine control systems use L4T as the logic signal; some GE-design units were...

Thibhika, VERY SIMPLY, IS (which stands for Intrinisically Safe) refers to methods for limiting the amount of current which might result in the ignition of combustible (hazardous) materials/atmospheres (areas) which wires pass through in order to try to prevent fires and explosions. There are...

Thubika, It's NOT about the number of wires in a multi-core cable--it's how the wires are arranged in the cables in order to reduce the possibility of electrical interference from other wires in the cable, and from other cables, as well. A "1 pair cable" (to use your description), is most...

CSA is trying desperately to give up this habit. (Seriously, folks.) I just can't bear to see the kinds of lame responses that are being given to some of these threads.... Yes the documentation is the best place to start--but unfortunately GE documentation is also pretty lame at times, and...

Oops.

Just a philosophy change. No consequences; no potential damage. As machines get more "mature" (older) and the learning "curve" levels out, some of the initial worries cease to be worries. It's just age. The age of the machines, in general. And experience. And a change in responsibility for...

ControlEng999, Temp matching would be useless and unnecessary for a simple cycle gas turbine. Temp matching is used to control exhaust temperature to limit steam temperature in an HRSG in order to help with starting-up the steam turbine faster. UNFORTUNATELY, this scheme is highly...

ControlEng99, The topic of temperature matching of GE steam turbines using the gas turbine exhaust temperature has been covered in some pretty good detail in the past on Control.com. The most common issue with this technique is that there is usually ”tuning” of the parameters required which is...

ControlsGuy25, You guess a lot. A LOT. If you don't know, don't post or say you don't know when you post. It's much more professional and better. Your research is very good, but--again, if you don't know say so. It's great to try to help as many posters as possible but it should be relevant...

D'ya see???? D'ya see???? D'YA SEE?!?!?!??!! This is ANOTHER reason I have tried to stop posting to Control.com. One asks for Diagnostic Alarm information (and Process Alarm information), and NOTHING. ZILCH. NADA. ZIPPO. NIENTE. SQUAT. These are NOT nuisance alarms. Full stop. Period. They...

Yes; I am, of course, presuming the hardware ("Berg") jumper settings on the new card are the same as on the old card. Also, provide the name of the new card and the old card. AND, what the PROM revisions on the card(s) are (you should have moved PROMs from the old card to the new card--so...

What Diagnostic Alarms are present? Have you checked the fuses (all of them) on the TCPS in Loc. 5? Please write back to let us know how you fare in resolving the issue.

Many GE-design Frame 5 heavy duty gas turbines do not have hydraulic accumulators (for some reason; who knows). Even those that do have small accumulators, which are rarely checked and when checked are done so incorrectly. Using the proper charging hose and knowing how the Schrader-like valve...

It probably means: Does natural gas temperature affect the combustion mode transfer temperature setpoints? OR Does it affect the ability to transfer combustion modes without any problems? To which you will probably reply, "You don't know enough; study more." The gobble-dee-gook is probably...

Atteya, You're in good hands with ControlsGuy25. He's very thorough. Yours was just the straw that broke the camel's back. I've accomplished more than I thought possible at times here on Control.com. Best of luck with your investigation.

"...Actually, at the moment of the trip, we could not identify any load disturbance from major loads. However, since we do not know the reason behind the trip, I'm assuming that one large load was starting without being detected by the DCS system (Very low probability). So, I chose one of the...