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cris, The LCI is connected to--and disconnected from--the generator stator terminals via a very large "swtich." When the turbine is being started the generator is being used as an AC motor. And the speed of an AC motor is directly proportional to the frequency of the applied voltage and...

Santanu Das, Please be very careful when talking about reactive current and referring to is 'power.' Some people here on control.com don't take well to this characterization. Leading reactive current flows in the generator stator windings when the rotor field excitation is less than that...

Ebi/abdi, According to Mambo's and mhwest's explanations, the problem could very well be the ignitor position. What they're describing is that the tip of one or both of the ignitors--if inserted too far into the combustion liner--gets VERY hot during diffusion flame operation in Primary and...

mhwest, This is an understandable explanation. However, one one would think if the ignitor were getting hot enough to become a glow plug that the life IOC the ignitor would be significantly shortened--even after the depth was decreased. Also, since the ignitors are usually held in position...

kwaku, White smoke coming from the exhaust during start-up/shutdown when firing on liquid fuel is the result of incomplete combustion. One or more combustors have lost flame and the unburnt liquid fuel is passing through the combustor and turbine section into the exhaust where it's...

Mambo, I don't understand how ignitor insertion depth can have anything to do with failure to transfer from Lean-Lean to Premix. During a successful transfer, the ignitors should not be energized, so insertion depth should not have an effect. The intent of extinguishing diffusion flame in...

abdi, The control system can only do so much. It cannot be used to make a mechanical issue like this go away. GE publication GER-3620 says every hour of operation in Extendedean-Lean is the equivalent of TEN hours of operation in Premix mode. When a DLN-I combustor is operated in Ext...

Crusader, Thanks for the feedback. One has to wonder, though, how often did you perform off-line compressor washes before you began measuring the pH, and what has been the compressor washing frequency since you started measuring the pH of the effluent? Is it possible that because of...

Hassan, This is NEW information. If the engine stopped suddenly, that could be due to a fuel flow issue, yes? And if there was an "automatic" command to start/run the unit, then it could have been interpreted by the control system to re-start and re-synchronize the genset. Yes? From...

There are instructions for using the EEPROM Downloader and the I/O Configurator in the Mark V Maintenance Manual, GEH-5980. The I/O Configurator is also discussed in the Mark V Application Manual, GEH-6195. You need to put the 0% and 100% stroke LVDT voltage values for each LVDT into the...

Detection of power relies on PTs as well as CTs. <pre> Fuel = Power No Fuel = No Power</pre> Be sure of any hydraulic fuel control system components (if any). I have also seen this problem before when the fuel supply is restricted. If the liquid fuel is fed from a large tank via a...

Senthil, We have no idea of the three gen-sets are paralleled with each other supplying an electrical load that is isolated from a large grid with many other gen-sets all paralleled together supplying a large load, OR if they three gen-sets are isolated from a large load and other gen-sets...

abdi, Yes; CPD does seem low. Do all the CPD transmitters indicate the same pressure? How does that compare with the CPD Pressure Gauge on the Accessory Gauge Panel? How does it compare with operation before the HGPI? If the ignitors are firing to re-ignite the primary flame detectors then...

Mustapha, If I understand this post and summary correctly, I think you have it slightly wrong. When IBH is not enabled, the gas fuel supply pressure has to be higher because the Lean-Lean to Premix transfer takes place at a higher load/fuel flow-rate, so the extra supply pressure is...

I was aware that the Mark VIe could be equipped with the ability to communicate via MODBUS without the need to interface through a GE HMI for data values and commands, but alarms and events were not yet possible via MODBUS. Has that changed? The problem with MODBUS is that there are no time...

If the exhaust spread temperatures described by abdi are (as I suspect) in Celsius, they are <b>REALLY</b> high. One must remember there are fourteen combustors on a Frame 9E and only four of them have flame detectors in the primary combustion zone. The presumption is that if the four primary...

I would agree, that, by convention <b>with respect to the generator terminals</b> a leading power factor would mean the generator would be absorbing power from the grid. However, I have seen grid requirements (in the form or Purchased Power Agreement obligations) reactive power requirements...

abdi, The spreads seem very high for a machine just coming off a HGPI. Since you seem convinced there is some relation to the opening/closing of the two gas control valves, have you compared the rates of opening/closing before the outage to those after the outage? For the...

Stefan, What kind of generator is to be connected to the grid? (In other words, is it a synchronous generator or an induction generator?) How many phases does the generator have?

Thank you for the feedback!