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> if the connections are made properly and proper thermocouple extension wiring > and terminal blocks are used then yes. To just expand a little on what d wrote, any time a thermocouple is joined to thermocouple extension wire in a junction box care must be taken to ensure <b>EIHER:</b>...

Vimal Gupta, When did this problem start? Has it been ongoing since commissioning of the Mark VIe? Or has it just gotten progressively worse over time, since a lightning-induced trip, or some other event (excessive rains, etc.)? Exactly how was the AC voltage checked? What kind of device...

Dear, 1) A GE-design Frame 9E heavy duty gas turbine typically has three turbine stages, and as many as seventeen axial compressor stages. Generally, the turbine buckets/blades in most turbines of any type these days are "blends" of impulse and reaction types. The buckets/blades may be...

Neo, What's this "T4*"? We can talk about CSRGV; later. Once we finish with L4T! Which should be VERY interesting for the unit at your site. There's no trickery involved. At Part Load (less than Base Load) the IGVs can be used to maximize exhaust temperature--and the maximum allowable...

niraj, When there is no load on an alternator there will be no current. For example, prior to synchronizing the alternator to another alternator or to a grid with other alternators the alternator is running at or near rated frequency and voltage but no current is flowing in the alternator...

Neo, Yes; L94T is very important. L4 will drop out (goes to a logic "0") when either L4T or L94T picks up (goes to a logic "1"). L4T is from the application code trip detection (Low-low L.O. Pressure; High-high L.O. Temperature; High-high vibration; etc.--we'll cover them all!). But these...

The Summary for this thread seems to disagree with the body of the thread. At least, something doesn't quite add up. Most importantly: When did this problem start? Has it been possible in the past to smoothly synchronize the two machines, but recently or suddenly it has become difficult or...

MC, 'Trip anticipators' as they are sometimes called are done in different ways by different control system manufacturers. The one you are describing sounds like it may be done using a high-speed acceleration detector. I would imagine that using enough maths and formulae that just about...

Old Guy, Seems my first post didn't get "picked up"--the one where I mistakenly identified KVM as Keyboard-Video-Monitor (which is redundant). Here is a link I found by asking my preferring Internet search engine "how to use one mouse for two computers?" (without the quotes)...

HA, Using my preferred Internet search engine to ask: "How does NTP work?" (without the quotes) this was the first result it returned: http://www.ntp.org/ntpfaq/NTP-s-algo.htm NTP is an open-source time synchronization application that is widely used around the world for...

KVM stands for Keyboard-Video-Mouse (not Monitor).

Neo, This thread is getting pretty large/long and I'm not sure I'm seeing all of the replies in a timely manner. So, if I miss a message/questions just let me know. L62TT2, is, again, kind of an "artifact" of code that GE just refuses to remove from manned sites. L1X is not usually...

Neo, The IGV position reference, CSRGV, is the output of a MAX select block--just like FSR is the output of a MAX select block. The IGV temperature control reference is basically the same as the CPD-biased exhaust temperature control reference. (Some older units had a 5-10 deg F offset...

Neo, Usually, whenever a GE-design heavy duty gas turbine burns multiple fuels (even two different gaseous fuels) there are fuel purge systems. This primarily to ensure that there is no fuel in the system which is not in service which can accidentally ignite, and also one of the primary...

Sanjay, You are well on your way to learning how GE-design heavy duty gas turbines operate, and how to troubleshoot them if you've already started studying the piping schematics (P&IDs) and gone out and located all of the control system field devices! Good on you, mate!!! I just can't seem to...

Neo, Wrong thread, perhaps?

Are you suggesting that there should be a particular speed that is achieved after a load rejection? I've never heard of such a concept, but that' doesn't mean it doesn't exist. But, reasoning through the situation, removing the load suddenly from a steam turbine necessitates closing the stop...

Sanjay, It's very difficult to understand how reasoning, logical people can decide that if the turbine runs fine in Droop speed control that because it doesn't maintain desired frequency in Isochronous speed control that the problem could be the GCV servo-valve--because that same GCV...

BND, There is 'exhaust temperature control' and there is 'exhaust temperature control.' Which exhaust temperature control are you referring to? Most GE-design heavy duty gas turbines have CPD-biased exhaust temperature control (this is what defines Base Load--and is the maximum allowable...

Sanjay, I won't even comment on the recommendation to change the servo-valve--except to say that I wish I owned Moog. You just replaced a perfectly good servo-valve, which just increased Moog's profit. (And if the servo-valve was purchased from GE, then you also increased GE's profits--and...