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RS. . . Although it's been some time since our last communication, curiosity has pushed me to provide the Negative-Sequence analysis of your Double-Delta configuration. I've chosen for the two-120Vac loads and single-240Vac load the proportion RW:BW:RB as 2:4:6 kVA, respectively. Am I close to...

Correction... the main gas fuel valve was 36" ! Phil Corso

ControlsGuy25. . . Additional Info: 1) Yes ! That's the one. In fact you can search for it in Control.com Archives under KCP&L or file # 984585006 ! 2) The Original Gas-Fired plant (I think main fuel valve was 30") used Energize-To-Trip logic that contradicted the standard at the time for...

ControlsGuy25.... Having been a defendant in a similar event... only it was an 800-MW plant firing natural gas. Fortunately no-one was hurt, but the 8-story plant was brought to earth (see attachment). I can tell you supposition at this time is a waste of time. Such events take a long time...

Amie. . . There is no parameter "Generator-Demagnetization-Time Constant", nor one called "Stator-Residual-Voltage" ! I believe you are referring to the phenomenon where the DC excitation-generator for the Main-Generator, loses its residual-magnetism Thus, preventing build-up of voltage of the...

Polo16. . . Unless you are involved in some sort of Warranty/Scientific requirement, I don't think you are obliged to use the procedure you described! For many years I used a simple method, not as accurate as FFT, but reasonable for field-work, needing: o A portable Oscilloscope. o A piece...

Ephraim... If it’s a typical non-geared DC motor the simple answer to your question is… No! Especially with your application's dimensions ! There are 2 reasons: o The 1st reason is related to Parasitic Capacitance. Present in all electrical machinery windings, the effect limits the motor’s...

BTW, if any of you younger forum participants want to learn about real plant experiences I urge you to search this forum's Archives for "BITE Stories", which stands for, "Believe It, True Event".

a062549 But, Clauses 392.9(B) and 392.9(D) refer to Multiconductor Control and/or Signal Cables only ! Not conductors or wires carrying significant heat-producing currents. Regarding your experience, I never witnessed a cable-tray fire, but I did investigate a situation where many...

Jasoncha. . . This argument has gone on for years. I've attached a paper by Newton Instrument Co. suggesting that Article 392.9(B) not be applied. You can tell by its date no one is listening ! I believe the dispute goes on because many Government and Manufacturing organizations like OSHA...

Controls Guy25 . . Would you mind revealing your "Interesting Documents"? Phil Corso

ControsGuy25... Will the attachment .PDF file help? If not, I suggest you use ANSI-IEEE. Regards, Phil

ControlsGuy25.... Get GE Document "Generator Rotor Thermal Sensitivity - Theory & Experience, GER-3809" Regards, Phil Corso

Gregorb6... The simple trouble-shooting test I alluded to earlier was to short-circuit just the two CT's involved ! If load-sharing returned via manual-control then the cause was the Cross-Current-Compensation, or CCC function! Regards, Phil Corso

Gregorb6 In all probability, and depending on the ship's age, the cause is related to a common, but simple, paralleling control-function called "Reactive-Current-Compensation", or just "Cross-Current-Compensation". I suggest you use the FORUM's "Search" feature for it as well as "Unequal...

MRasool. The data are inconsistent or lacking: 1) Nameplate data reveals motor's rated RPM is 2,960 resulting in a full-load slip of 40 rpm (1.33 %). Charts 2, 5, and 8, indicate slip of 25 rpm (0.0083 % at 100% load) ! If true, then motor is not 100 % loaded ! 2) Where are the corroborating...

AAKhan, If the problem hasn't already been resolved, I suggest you look to the Affinity-Law for Pumps... especially at what happens at such a low RPM (less than 6%) in a vertical application ! Regards, Phil Corso

Mehboob... Interestingly, a hissing sound only comes from an air-leak ! Fluke, has an instrument called the "Ultrasonic Acoustic Detector" that allows a maintenance tech to literally "see" the leak" ! Now the interesting part... the sound made by an air-leak must be greater than 60 decibels to...

Erric, One-Eye... Attached is a copy of a similar Control.Com thread posted in 2005. Regards, Phil Corso

Hast66... The attached should help . Regards, Phil Corso