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Esoteric_Stone, Relay 25 is the actual relay contact the Mark* closes to close the generator breaker during an automatic synchronization. Relay 25A or 25X has to also be closed, in addition to relay 25P. Relay 25P is the relay that says that all the permissives <i><b>in the Mark*</b></i>...

moussab, As for changing the Control Constants for the gas valve leak tests, .... It's GE's opinion that this is a "standard" safety requirement--something they put on all their new units. It's partially in response to some regulations and laws in some parts of the world that require this...

vsegvic, You've probably already done this, but the only thing I can offer is to contact various valve sales companies, who may represent one or more different valve manufacturers and describe your requirements and ask them for their recommendations. You may have to talk to several companies...

moussab, You could just have the valves refurbished during the upgradation. That would restore them to near new condition, and probably reduce or even eliminate the leakage. As for a Mark VIe simulator, I haven't had the privilege to work with one. Are you referring to KILL_IO? (Please...

tommy_yotsakorn, >Could you explain power plant generator control mode >between MVAR , voltage control and PF? Very briefly, synchronous generators have excitation control systems that control the amount of power applied to the generator rotor (called the generator field). The amount of...

cac86, >My friend told me that, after the governor of the engine >went to 100% they have a blackout,they didn't realize >exactly the sequence of events, because everything was too >fast. >Anyway they found reverse power on the other 2 running DG. >They found over frequency on users...

Esoteric_Stone, Is this questioning about deadbus breaker closure??? In my personal opinion, the rungs in the Mark VIe should be identical to those in the Mark V. Realize that there are some external permissives for deadbus breaker closure--that are usually hardwired into the generator...

Esoteric_Stone, Yes, I know your generator is not hydrogen-cooled. And, the messages that CIMPLICITY display come from the .CIM file configuration. So when the DPYSTASTn block enumerated data changes value, CIMPLICITY chooses the message to display from the messages configured for the item...

Esoteric_Stone, >The synchronization relays were previously on the TCTG card, >and I believe there was more space on the <b>TTUR</b> card than the >TREG <b>or TRPG </b>for them. Also, since every Mark VIe doesn't use a TRPG or TREG but most every Mark VIe's includes a TTUR, the...

moussab, A fine choice, the rip-and-replace option. And, yes, GE can replace the CCC compressor control very easily in the Mark VIe using Mark VIe components and software designed for the purpose. Young & Franklin, the original manufacturers of the SRV and GCV assemblies for GE, are now...

nldgseeker, GE publishes a document, GER-3960, which states the different methods of assessing the effects of starts, stops and trips on their heavy duty gas turbines. It's a rather large publication, and it tries to cover every Frame turbine they build, so sometimes it can be very difficult...

Esoteric_Stone, Oh, I know all too well: EVERYTHING THAT GOES WRONG IS THE MARK*'S FAULT. (Be it Mark IV, Mark V, Mark VI or Mark VIe.) And, yes, exciter field service people also blame most excited problems on the Mark*. Even the ones with decades of experience, unfortunately. Glad to...

Esoteric_Stone, It's outage season and many of us are extremely busy right now. Automatic synchronization almost always involves two "relays"--an automatic synchronization relay AND a synchronization check function. Both relays have to be picked up at the same time for the generator...

Esoteric_Stone, Hydrogen-cooled generators are purged of hydrogen when hydrogen purity is very low, or there is no power for the hydrogen puruiy monitoring system or there is no AC power available for maintaining the hydrogen seal oil system pressure. Have you let the GE commissioning...

Esoteric_Stone, I didn't really address the question of MVAr and generator terminal voltage. When synchronized to a grid with other generators and their prime movers, when the generator excitation is such that the generator terminal voltage is exactly equal to the grid voltage--the MVAr...

cac86, The plot thickeneth. It's not an operator action causing the increase in load of one of the three units supplying a small grid (also known commonly as an "island load" because it is operating independently of a larger grid with more generators); rather, it's some kind of failure of the...

WOW! Just simply, WOW!!! If the Mark VIe is synchronizing the unit and closing the generator breaker, then the phasing of the BUS & GEN PTs to the Mark VIe IS CORRECT! It may not be correct to the EX2100e, but it's correct to the Mark VIe. If the generator voltage is rising up very quickly...

Hello, Yes; I have lots of ideas BUT I'm not going to guess and speculate and try to explain every one of them--because you aren't telling what alarms are occurring when the unit "doesn't start" on liquid fuel. Does it fire and then lose flame during acceleration? Does it not fire at...

Hi, It's projects like this that cause 'team' to be thought of as a four-letter word. (MANY "bad" words in the English language have only four letters....) GE wants you to believe that there won't be any changes to the operation of the turbine and auxiliaries with the change to the Mark...

Good question. I've often wondered that myself. I have never found someone who knows the answer to that question, and in my experience wheelspace T/C designations only usually refer to left and right locations. I did notice one on a very old machine with -2 & -3 designations that one side...