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Sriram... three major derating factors, when using 3 single conductors in a three-phase system, are: 1) ambient temperature. What is the prevailing ambient temperature in your installation? 2) configuration, that is, trefoil (triangular in arrangement) or flat (side by side, or one above...

Responding to Danko's 05-Feb-10 (07:36)... Are you sure your meter connections are correctly polarized. For the 3-meter case, the voltage readings must be phase-to-neutral, not phase-to-phase. In addition you must be sure of phase sequence (rotation) a-b-c or c-b-a! Regards, Phl Corso

Anon... faced with a similar problem before SERs or SOEs were available I used a camcorder trained on the instrumentation panel. Its frame/sec rate was increased some 5-10 times normal. It never failed to determine the cause of the disturbance. Regards, Phil Corso (cepsicon[at]aol[dot]com}

Ibrahim, yours is a tough question... right up there with, "Can you describe a ratchet without using your hands?" Your question is best answered by starting with a brief discussion of Motor-Frame-Designations that cover a host of standard, off-the-shelf motors. Manufacturers use...

Sriram’s 27-Jan-10 (06:28) queries... please clarify the required Ampere value. 4,100-A, is adequate for only 78 MVA? Regards, Phil Corso (cepsicon [at] aol [dot] com)

Ibrahim Awad... rather than leave this question unanswered, perhaps you can expand your query! (1) Do you mean, "Given a shaft diameter, say 'X' mm, then, what is the maximum Hp of the motor in which the shaft is fitted?" Or, (2) Do you mean, "Given a shaft dimension, say...

Solo... please provide additional information: (1) You mentioned transformer(s)in plural. Are they connected to the same 433-V bus? (2)If the answer to 91) is yes, then what are their nameplate parameters identical? (3) The current values you listed yield an Ampere- Unbalance-Factor...

Markinnh... As you probably know I have a hangup regarding Anonymity. So, if you want the solution contact me off-list. Regards, Phil Corso (cepsicon [at] aol [dot] com)

Markinnh... Being sailors, how important are cost and efficiency? Regards, Phil Corso

Markinnh... which circuit is to carry the 500A? Regards, Phil Corso

Hussain... since your search of Control.com Archives was unhelpful, then contact me Off-list. Regards, Phil Corso (cepsicon [at] aol [dot] com)

Wakataman... your query can't be answered with the wave of a magic-wand! You must provide detail! Regards, Phil Corso (cepsicon [at] aol [dot] com

Hussain, I suggest you search Control.com's Archives for Neutral Grounding or Neutral Earthing! Phil Corso

Sounds more like an induction-generator application! Regards, Phil

PICguy, further to my earlier post... I suggest the use of a micro-synchronous motor, like a clock drive, being driven by a simple V/f controller! Regards, Phil Corso

Search Control.com Archives for: Motors in Tandem; Coupled Motors; Motors Driving Same Jack-Shaft Regards, Phil Corso

Responding to Eurydice's 11-Dec-09 (05:02) query... Do you mean the Inertia Constant, H (stored energy per kVA) and the Angular Momentum, M (Joule-seconds per radian)? If so, and you are conducting a Stability Study involving an infinite-grid, you only need to know your own plant's...

Heni... the value 75MVAr or 90MVAr is meaningless unless you include the corresponding MW. Adding them vectorially produces MVA from which current (I) is determined. Heating is proportional to I^2. Regards, Phil Corso

Krish... An analysis of the Table you provided showing the test results of six component configurations, repeats almost exactly the VUFs I forwarded to you. Following is an abridged version of your table with comments/and questions: A) Gen, Bus, VTs, w/o GSUs. Are you able to excite gen from...

Krish.. a perfect case of "catching the mice, and allowing the elephants to go free!" If physical inspection revealed nothing suspicious with taps, then I suggest a rather simple test. However, you are probably aware of my idiosyncrasy regarding anonymity, please contact me off-list...