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T.Sriram, I believe what we are trying to say here is that the real power flow in the two lines is a function of the reactance of the two lines, the configuration of the substation, and the loads the substation is supplying. It's not simply about the difference in resistance of the two lines...

BairdUK, I can address the "real" power output side of your scenario. I'm hoping another contributor, Bruce Durdle, will address the reactive power/island system voltage side of your scenario. As you described your scenario where the 140 MW unit is acting as the Isochronous unit when the...

Randy, On a GE-design heavy duty gas turbine it's important that the internal temperatures of the gas turbine be below a certain value before the unit is taken off "turning gear". It can take as long as 24 hours, sometimes longer, for the unit to cool sufficiently while on "turning gear" to...

The concept of Cv has been covered many times before on control.com. I believe you can also find some information about Cv and how it's determined on other sites, such as www.wikipedia.org. In my experience, the Cv of a valve is something that is designed and built into the valve and is...

What does the manufacturer, BHEL, say about the problem? Did the manufacturer recommend running the turbine un-coupled from the blower for any "break-in" period? I know this is sometimes a practice that is done with large AC electric motors, but I've never seen this done with turbines for...

raj, I want to make one more clarification here. Some temperature transmitters use RTDs as their sensor. They are the "monitor/device/control system" to which the RTD is connected. They then convert the RTD resistance input to a mA output, usually, which is then connected to some kind other...

raj, Are you asking about <i>transmitters</i> or <i>RTDs</i>? This thread is about RTDs, which are NOT transmitters. As for compensation, which is used for RTD measurement, that's done because RTDs are devices that vary their resistance as the temperature in the area they are located...

Ashraf, This is an interesting question I've often considered myself. I don't believe there is a method for calculating the shaft horsepower of the gas generator (high-pressure section) of a two-shaft gas turbine. I don't believe one can attach a dynamometer to the shaft the same way one can...

For digital Speedtronic turbine control systems, as an example, the inputs to the FSR Minimum Value Gate are:<pre> FSRSU FSR Start-up FSRACC FSR Acceleration Control FSRN FSR Speed Control (Droop OR Isochronous) FSRT FSR Temperature Control (Base, Peak, Peak Reserve, if so...

Triad cable is three wires (conductors; cores) that are twisted and shielded, usually in a "plastic" cover/jacket. A triad would only provide you with three wires/conductors/cores, and a properly-applied 4-wire RTD requires 4 (four) wires/conductors/cores. You could use two (2) two-wire...

T.Sriram, Some additional clarification, please, and another question. You wrote: > Our line 1 & 2 are connected to substation at a distance of 5.2 KM. Our line 1 length is 5.2 <b>mtrs</b> > and line 2 length is 7 <b>kM</b> as it was taken in a different route. You wrote Lines 1 & -2...

An error and a couple of points of clarification. First, the paragraph: > And as the turbine speed reference is increased to 104% the load will increase > to 25 MW, or 100% of rated. is wrong. It should have read: And as the turbine speed reference is increased to 104% the load will...

Hello, Dear, The latter paragraphs of this thread provide a clue as to how a power island should be operated--either manually or automatically: http://www.control.com/thread/1357683036#1357835439 It's virtually impossible for us to help you with your problem, because we don't have...

4_20 mA, I have absolutely zero experience with this concept. I do have some experience with aero-derivative gas turbines, but this seems very unusual to me. I don't understand how swirl angle can be related to a measurement differential since even if the temperature of the exhaust at some...

4_20 mA, The Minimum Value Gate is used when there are two or more possible references for a particular parameter, say fuel control valve positioning. The concept is that in order to protect the turbine and axial compressor from overload and/or overtemperature (exhaust overtemperature) the...

Let's say your turbine is rated at 20 MW at Base Load and the unit does not have Peak Load capability. This means that at ISO conditions (usually 59 deg F, 60% relative humidity, at its design altitude and atmospheric pressure, and at rated exhaust back pressure), in a new and clean condition...

GT, First of all, during a CI, nothing that affects the wheelspace cooling (or heating) is changed. Second of all, it is physically IMPOSSIBLE for the temperature of any wheelspace to be so radically different on opposite sides of the unit. The shaft of a Frame 5 is spinning at...

Were the wheelspace T/Cs removed during the CI, and then re-installed after the CI prior to the start-up?

Aero-derivative units can be loaded and unloaded MUCH faster than heavy-duty units. Most other gas turbines (heavy duty, industrial "Frame" units) usually have slower loading and unloading ramp rates than LM units in Droop Speed Control mode. It's not exactly an apples-to-apples comparison...

mhs100, Unfortunately, I cannot. I do not have a copy of CIMPLICITY (PROFICY) on any of my PCs. (Actually, I refuse to install it on any PC I work on; it's a very poorly behaved application.) Just like searching the World Wide Web, be creative in your search words and terms, and don't stop...