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Giuseppicciau, No; it's not really clear. I wouldn't recommend putting two units in true Isochronous Speed Control mode unless you are looking to possibly lose your job after the plant recovers from a black-out. I tried to be as clear as possible: WITHOUT any kind of external load control...

I tried SOOO HARD >>NOT<< to mess the initial description up!!! BUT, I did.... >And if the load of the Droop unit was manually increased >the load of the Isoch unit would automatically <b>decrease.</b> <b>DECREASE.</b> The Isoch unit load will (automatically) respond OPPOSITE to the...

It seems someone, in their infinite wisdom, decided that an "external" power management system (load-sharing system) was required for the plant to operate. And it uses some kind of Isochronous Load Sharing scheme for the MW load control. I presume the 'facility' is not tied to a grid??? In...

aperkot16, >Is it possible to use a <b>modern</b> laser printer for the control >panel of a gas turbine Mark 4? How can this be realized? The reason <b>old</b> dot matrix printers are (still) used for Alarm Printers in many applications is because they print one line at a time--and most...

GODWIN REUBEN, A former colleague of mine used to use a little rhyme to help operators remember the basic steps for starting a GE-design heavy duty gas turbine with a PC-based operator interface: FUEL MODE START LOAD Once the unit is started, and possibly a load selection is made (see below)...

jr94, Sorry for the lateness of my response. I think I understand the concept of the diode matrix now, and in my personal opinion it's typical of GE Belfort--overcomplicate and unsimplify. Unfortunately, the deed is done, and you have to live with it. Looking logically at this problem--as...

rokan_123, And before anyone freaks out about the current drawn by the electric starting/cranking motor during purging and acceleration (including during FIRE mode operation) the motor has Class F insulation, and it does not run continuously at the higher current draw. It draws the higher...

rokan_123, 1200 RPM out of 3000 RPM is 40% of rated speed. The electric motor is typically still providing torque up to 60% of rated speed--AND it is usually drawing 150-160% of rated current during starting and acceleration. This includes during FIRE mode (which just holds FSR at the Warm-up...

gbuendia, I'm not sure I understand 4X-4. I have seen unusual occurrences like this when there are power supply issues. For example, you have mentioned having redundant power sources, and I presume (because you haven't provided any information) you are referring to a 125 VDC battery AND a...

Power Island, Very glad to hear you were able to resolve the issue, and thank you for the feedback!

Mick J, Few points; atomizing air pre-cooler discharge temperature should be approximately 125 deg C--because there should be no possibility of moisture condensation at the inlet to the atomizing air compressor. A liquid fuel only machine will not have a gas tip, and so would be the gas...

jaed, >My recommendation is as follows: Synchronize the smaller >turbine-generator to the grid in Droop Speed Control mode >(in other words, synchronize it with the utility tie breaker >open). Sorry for any confusion! It should have read, (in other words, synchronize it with the utility...

gustavo_marcelo, I really think that what I haven't been saying--but have been expecting people to just intuitively grasp and understand--is that the gas turbine is loaded and unloaded (at all times) by increasing or decreasing TNR, an analog value that is usually between 100% and 104% when...

gustavo_marcelo, <pre> TNH------------------------------------------ | + + -| +...

jr94, Two things jump out at me from the information provided. First, are the 'Alarms' you listed times for actually alarms (Process Alarms? If they are, then do you have the SOE information for the inputs which drive those alarms? SOE is the term given to the optional function that can be...

Mick J, One would presume that if the gas fuel system was decommissioned it was also removed--meaning the manifold surrounding the axial compressor casing was removed, and the pigtails/hoses from the piping to the fuel nozzles were also removed, and that blank flanges were placed on the gas...

Power Island, There are procedures for replacing the DCC/SDCC and LCC/SLCC cards in the Mark V Maintenance Manual, GEH-5980, as well as a table describing (in very little detail) what each of the I/O State codes indicates. A8 is usually not good; not good at all. If <R> went "down" first...

jaed, >Our questions come once the two units are synchronized. how >can we unload the small generator and transfer all the load >into the bigger one? The small generator is in droop mode >governed with a UG40. The usual load in the bus is around 3 >MW. >What mode should we set the...

guatavo_marcelo, "Pure" Droop Speed Control uses Proportional-only action (the P in a PID control function) to control the amount of fuel flowing to the combustors of a gas turbine driving a generator synchronized to a grid with other generators and their prime movers. When the difference...

Mick J, Something seems amiss here. Most of the units with LPG I have worked on have used the same gas fuel delivery system (manifold and nozzles) that are used to deliver natural gas; they just use separate Stop-Ratio and Gas Control Valve SRV & GCV) assemblies--one for LPG and one for...