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Dilip... for the assistance you seek, please contact me off-list at: cepsicon[at]AOL[dot]com Regards, Phil Corso

Ameya... the simple answer to each of your questions is... no! However, there are certain constraints that must be satisfied. I suggest you search the Control.Com archives for "parallel transformers." If you are unable to find a suitable answer, contact me directly at...

Phil Level...; to avoid mis-interpretation of your data, please forward a simple SLD (Single-Line-Diagram) or hand-drawn sketch to me at: cepsicon[at]AOL[dot]com Regards, Phil Corso

Ron... For a well thought out answer to the infamous question "To E-Stop or not to E-Stop", I suggest you refer to Tim Park's article in the Feb-2000 issue of "PTdesign Magazine." He has an excellent grasp of the intent of the E-stop function. For additional information see...

John... it appears your question is directed to my 10-Jul-07 (19:55) reply to Anonymous! It is possible to end up with a derating factor equal to 0.4. However, in order to answer you quantitatively please provide some detail! Regards, Phil Corso

David... over sizing the transformer will not overcome the deleterious impact non-sinusoidal voltage and current waveforms have on a general-purpose control transformer. Regards, Phil Corso

If one is unable to procure an expensive instrument to determine Harmonics, it can be easily done with an oscilloscope, a piece of tissue paper, and an amazingly simple Fourier Series (mathematical) Analysis! Anyone interested can contact me for the method. Phil Corso (cepsicon[at]AOL[dot]com)

Hhh... see http:/www.control.com/thread/1272481008 Regards, Phil Corso

Freakindj... I accept your thesis regarding MV cable installations, but this is a LV one. And the cable-size is such that induction heating of the sheath/shield is a possibility. And, if correctable, then discussion of cable change is moot. Regards, Phil Corso

Richard... Good pickup by d-! If installed as a shield, then increased temperature of the shield could be caused by negative sequence currents being induced. The root cause could be the earthing method used! Regards, Phil Corso

Richard... what is the ambient temperature? Phil

Wady... in general, transformer size is never based on "connected" load! Neither will "maximum demand" result in an economical solution, because load profile is extremely important! Also, because there is no "one size fits all" approach, I suggest you contact several transformer...

Richard... the line-current values yield an Ampere Unbalance Factor (AUF) of about 1.8%, which is considered low. Two additional thoughts: (A) Can you confirm the 4 core cable has a non-metallic sheath! (B) What are the line-to-line voltages? (C) Ehat are the line-to-neutral voltages...

Richard... what about the neutral-current? Phil

Richard... the problem you are experiencing (if not new) is not unusual for the load you described. The most likely cause is that the neutral conductor is too small. Q1) Are you sure the 4th conductor is 200mmq and not a smaller size? Q2) Was the 220A value a reading of the phase...

Bruce, I propose putting the subject to rest with a simple vote of the forum members! Anyone expressing an interest in stopping the constant bickering (remember my hermit story) need only consider the following question: Should the entity Volt-Amperes, reactive, be addressed as "VAr" or...

Bruce... are you defining "reactive power" as the power loss in the resistive elements between the source and the load? Regards, Phil

CSA... you had to bring up "Reactive Power vs VAr". What I said was, "reactive power" (as a noun) is an oxy-moron. I suggested, nay, recommended, using "VAr" instead! I also said (but you keep stating you hadn’t read it, yet) and I quote, "Note, this recommendation does not preclude anyone...

Siva... replying to your questions in the order presented: 1. The earlier topics cited revealed certain constraints to simplify the analysis. Please note that thread #102639176 suggested substitution of three (3) single-phase transformers, thus ignoring the effect of mutual impedances. The...

CSA... in addition to your Spell-check and counting skills, you certainly have the tenacity of a hound dog!!! Regarding your comment about VAr... of course they must come from the supply! Do you believe the Ind-Gen produces its own VAr to satisfy its magnetic needs? And, if not connected to a...