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shradesh sharma, It's called the Ideal Gas Law (PV=nRT). And the Ideal Gas Law basically says that if one increases the temperature of a volume of gas the pressure of the gas will also increase. All other things being equal in a hydrogen-cooled generator at Base Load the generator is...

Makster, A 1.5 MW motor is a pretty big motor, and we don't know if it has a soft starter or some kind of wye-delta or some other kind of starter and we don't know what the inrush current is or was and we don't know what starting such a large motor does to the island voltage and power factor...

vinodkpandey, It really sounds like there is something wrong with the fuel control system that is causing the problem, and that flame is being lost because of low fuel flow-rate through the nozzles in one or more combustors resulting in the Combustion Trouble and High(-High) Exaust...

Sirtaurus12, What OTHER Process Alarms are annunciated when the Cooling Water pump changes over? And, what is the timing of the alarms (before or after the lead pump trips)? Specifically, is there a Cooling Water Pump Motor Overload alarm, or an Auxiliary Motor Overload alarm? When did...

electrocuted, How is the frequency of the islanded system (isolated from a larger grid) at your facility maintained? Do the operators make manual adjustments to the loads of the generator-sets when the frequency of the system changes as the facility load increases or decreases? No one has...

electrocuted, The fact that the operators were unable to change load suggests that manual load change signals were blocked--most likely by some automatic load, or frequency, control scheme which was active at the time. Your recent post about frequency control on a small power islandwhere all...

electrocutie, There would be two (2) ways to accomplish frequency control under the conditions you have described. The operators would have to be manually adjusting the loads of one or more generator-sets to maintain the desired frequency. Or, there is some kind of frequency monitoring...

Makster, >Regarding your discussion on null bias, what can then be a >factor that caused P2 pressure to decrease (by 1 bar!) if >SRV is fine? We have checked the SRV output and feedback and >there is no error. The P2 pressure did drop and it dropped >exactly when GCV suddenly opened. What...

drafnoob, An instrument cable, by definition, is also an electrical cable. The concept you're most likely referring to is signal level separation. It's NOT advisable to mix instrument cables (typically less than 50 or 25 VDC) with cables above these levels--especially if the higher voltage...

Makster, >As per GE, our normal understanding of Iso and Droop >behavior during load pickup (i.e Iso will take up all the >load and droop won't) only works when the Droop turbine is >running at its base load i.e maximum capacity. If there are >still margins left in droop turbine IGVs, Iso...

Moses/Makster, >2) Why did GT_2 IGV not open to max? IGVs and IGV control are very misunderstood are not used to reduce exhaust temperature in the event of high exhaust temperature. For most combined cycle applications (such as our friend Makster's) the IGVs are used to MAXIMIZE exhaust...

Brilliant. Simply brilliant.

You say you have recently noted this problem with two of the units. Have you checked the differential pressures across the turbine inlet air filters of all four units before and after the rain? How do they compare? (You want to do this when the units are running at the same loads.) The kiel...

A torque converter between a gas turbine starting means (be it a diesel engine or an electric motor) is necessary because the starting means can't be directly coupled (connected) to the turbine-generator shaft. The turbine-generator shaft is extremely heavy and the starting means develops very...

Makster, The typical logic signal for Isochronous Speed Control selected and active is L83SCI, but it's NOT usually included in the Data Capture blocks for Trip History data. If you have a GE Historian, it might be in that historical database. It might also be an EVENT, but not always. If it...

Saulguy, You need to download and read the Product Data Sheet for the EGB-13P, because it seems to very clearly state that an electronic, digital or pneumatic device is required to start the machine. The EGB-13P appears to take a signal from any one of those types of devices and convert it to...

Makster, I would have responded earlier, but I have been traveling and don't have great Internet access nor a lot of time these days. I was on a plane when I had a couple of minutes for my last reply. I think MIKEVI is pretty good and has already pretty much identified the issues. And...

Makster, I'm first looking at the GT-B 5.png document (Alarm List). At 15:29:23.632 the Turbine Underspeed Process Alarm went to NORMAL; we can't see when it went to ALARM. At 15:29:23.362 (the same time) the Generator Breaker Tripped Process Alarm went to NORMAL; again, we can't see when it...

VIJAY, If the unit DLN (Dry low NOx) combustors and three, redundant lad transducer inputs, it will likely trip because of the loss of two of the three inputs. DWATT is a very important component of DLN control schemes, and the designers deemed it possibly destructive to the hot gas path...

vladimir36, I've been doing some investigating because I don't really understand how an induction (asynchronous) generator could remain synchronized to a grid, or not disrupt a small independent power system (sometimes called a power island because it's isolated from a larger "infinite"...