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briq99, Hmmm... I always just follow the procedure for replacing the VCMI in GEH-6421 and I haven't had any problems. The only way I know of to configure the VCMI is by downloading to it using Toolbox. This is another big reason when something like this happens to a working panel (meaning it...

sirdee90, Do you not have access to the Parts List/Manual provided with the turbine-generator and auxiliaries when they were new? To be sure you receive P/Ns for machine as much like yours as possible, you would need to tell us the age of the unit (when it was installed when it was new). The...

briq99, My (painful) similar experience has led me to these practices, but patience is a BIG key under these circumstances: 1) Make sure ALL the IONET cables are good, and that there is no corrosion or discoloration on any of the BNC connectors on the cables, including BNC tee connectors...

"Synchronous generators respond to load-generation imbalances by accelerating or decelerating (changing speeds). For example, when load increases, generation slows down, effectively releasing some of its inertial energy to compensate for the load increase. Likewise, when load decreases...

By the way, when you finish with all the maths, can you post the results--indicating how much (in percent) each genrators SIR and H value and MVA rating contribute to Frequency response? Is it 45%, or 72%? Or 2%, or 0.73%? Thanks!

Good day, Dispatch operators have all kinds of preferences, they are, after all, human. Most of them are thinking human beings that use their experiences to form their preferences. (Some (more and more, actually) just do what they've been told, which is usually, "We've always done it that...

vladimir36, Sometimes that's very difficult to do--prevent an overspeed during a load rejection. Other than telling us the turbine is a multi-shaft gas turbine, you really didn't give us anything else to work with. Is the HP/gas generator is tripping on overspeed or the LP/power turbine is...

syed taha ahmed, Again, welcome to Control.com. Gas turbines are mass flow machines. This means, the more mass that flows through the unit the higher the output will be. Gas turbines generally operate at a constant speed (or in a limited speed range for mechanical drive units). That means the...

syed taha ahmed, It would be nice to know what manufacturer's turbine and size of unit you are referring to, as well as the turbine control system being used to control and protect the turbine. Usually when this happens with GE-design heavy duty gas turbines of the B/E class (in other words...

syed taha ahmed, Primarily, humidity sensors are used on GE-design heavy duty gas turbines when water- or steam injection is used for NOx emissions reduction. Even some machines with DLN (Dry Low NOx) combustion systems that burn both gas fuel and liquid fuel may use water- or steam (usually...

Controlsguy25 and Engrahmed, "Please note line voltage zero mean fault in transmission line due to any reason while the generator circuit breaker was closed and the turbine-generator was supplying power to the grid and therefore GCB opened due to the over frequency due to the sudden...

Controlsguy25, Yes; there are a LOT of things about this scenario that are not clear or understandable. And, yes--you are right. Knowing the turbine manufacturer and turbine control system is kind of important (as is the size/rating of the unit). And about the only way I could think of that...

Engrahmed, Most people don't realize it but when a steam turbine is tripped while the generator is producing electrical power (the GCB (Generator Circuit Breaker) is closed and supplying amperes to a load) the first thing that should happen is that the steam turbine stop valves should close...

Controlsguy25, When I worked on the Mark IV (which had a black-and-white, text-based CRT and "soft-switches for an operator interface) I would occasionally have to change a few rungs and Control Constants (well, maybe more than just occasionally, but it wasn't ever necessary to make a lot of...

Niente.

Ghulam, In the Operations & Service Manuals provided with the turbine-generator and auxiliaries you should find some very good information about the gas fuel system, as well as about the DLN combustion system provided with the turbine-generator at your site. Personally, this is the first time...

hussam295, There are NOT any additional proximity sensors on the unit--in addition to the -X and -Y proximity sensors on each turbine bearing, and the ones on the generator (methinks there is something amiss with the generator proximitors....). To gather the required information for vibration...

To add a little more about "goosing" the expander turbine causing the actual acceleration rate to exceed the acceleration rate reference, when the starting means is disconnected (when the jaw clutch opens) if the actual acceleration is above the required the Mark* will reduce the fuel to try to...

hussam295, Vibration sensors--on any type of rotating equipment--fall into three basic types, depending on the equipment the sensors are installed on and the speed of the equipment and they desired type of measurement. There are velocity vibration sensors, distance vibration sensors and...

sonacontrol, Thanks VERY MUCH for the feedback! If I'm not mistaken, on MOST GE-design heavy duty gas turbines 20CS-1 is de-energized when the shaft breaks away from zero speed (during a START). It's the shape of the jaw clutch teeth that keeps the clutch halves engaged during starting, and...