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MRasool, Attached is the post I had referred to in the earlier thread called "Reverse VAr" Phil Corso

A number of forum threads discuss how the step-up transformer connecting an Alternator to the Grid is able to control voltage-alignment using a Tap-Changer. Also discussed is the question, "What happens when tap-position is altered?" Thus far, in my opinion, there has not been a viable...

Happy Easter to All

This thread is devoid of all speculation, conjecture, theory, guessing, bluffing, etc, that we have seen lately. All, including PtPs, are invited to participate: Two 100MW, 60Hz power plants, a 1/2 mile apart, are to be interconnected in a substation located midway between them via an SF6...

At the risk of fomenting brouhaha I’ve taken the liberty of addressing the challenge (?) by CSA. First my "claimer"... the following discussion is excerpted from the text* I used to teach an Electrical Technology course in Staten Island Community College, a Division of City University of New...

Drill, I have taken the liberty to post this new thread for three reasons: 1) It's a good one... something not covered in detail in the past. 2) To cover the 4th question in your 17-Aug-09 00:33) thread # 1250483614 "Importance of Reactive Power." 3) The 4th question seemed to be...

I've taken the liberty of submitting this topic to address CSA's, Cephas', and Robbyk's questions... paraphrasing, "Why is the MV system-neutral grounded, especially when a 4th or neutral-conductor is never required!" If it were possible to insulate electrical equipment with glass, this...

Gentlepeople... to more adequately explain the phenomenon known as "Armature Reaction in Synchronous Generators" I intend to issue a "white paper!" It will include both the magnetic and electrical relationships. However, previous "text only" dialog has led to further confusion and...

The contributors to the thread "Variation in Level" certainly know their 'Pees', 'Iees', and "Dees", while in my case its way over (excuse the pun) my head! Now, if you can, solve the following problem: A process fluid tank can be filled by two fill lines in 4 and 5 hours, respectively. It...

I just found my old, but by no means obsolete, JIC (Joint Industrial Council) and SAMA (Scientific Apparatus Makers Association) Standards: JIC Standards for Industrial Equpment, 1957. Standards for Mass Production, EMP-1-1967. Standards for General Purpose Machine Tools, EGP-1-1967...

Now I know some, hopefully not many, A-List members object to my technical correctness. I'm sorry, but it's an addiction! It's because I'm a technocrat... a person, who, upon learning that 4,342,615 people were married last year, says... "Why isn't the number even?" Regards, Phil Corso...

<p>Following are several old-fashioned, simple but effective non-electrical methods to estimate a motor's load-factor: <p>1) Load estimate by slip. This was discussed in the Fri, Dec 27, 3:30pm response to the thread "Efficiency Calculations of Old Motors!" A fluorescent lamp was used as the...

Responding to earlier comments on "PROC: Different Ampere Readings" ( "http://www.control.com/1026152969/index_html":http://www.control.com/1026152969/index_html ): Different current readings are caused by an unbalanced voltage at the motor terminals. Furthermore, NEMA (National Electrical...

I recently came across previous postings on this thread. Several very misinformed individuals advocated rapid transition, but exceedingly insignificant, times... of the order of 20, even 50 milliseconds. The purpose of star-delta starting is to reduce current inrush... perhaps to reduce...

While I am at odds with Paul Gruhn, PE (and others) regarding the merits of ESS vs PES, I heartily agree with his comments in an article presented in the Feb issue of Intech magazine. The article "Control Technologies for Safety and Production", co-authored by Frank Watkins and Kelly...

Correspondence seems to be heading in a too-ponderous direction. I thought of one of my ms (mis not Micro-Soft) adventures: Years ago I was Utilities Manager w/ Celanese Corporation. The plant was located in the Iron-Bound district of Newark, NJ. An-aside: Called Iron-bound because area was...

The earlier subject was "APPS: Fuses for 24 Vdc Circuits." This presentation is to eliminate some myths, misconceptions, misunderstandings, and plain poppycock, as to how fuses function and what role Vac or Vdc plays. Furthermore, discussion is limited to "low" voltage systems, i.e., 600 Vac/Vdc...

A) The Physics of... Unwarranted fuse Operation. For starters (excuse the pun) but a fuse should not "operate for a short to ground" in an ungrounded system. More likely, the fuse operated due to higher than anticipated starting current. The accepted rule of thumb is that starting current is 5...

This is in response to the direct requests for the answer to the question: "Why Are 3-Phase Power Systems more Common Than 2, 4, 5, ..., n-Phase Systems?" Most of you were correct. It is, of course, the most economical. BUT... will be addressed at the end. All systems will be compared...

A recent topic addressed the problem of "poor" termination connections in a motor. Temperature-rise was given as a parameter to investigate. It is well known, that, for common power conducting elements, the temperature rise is related to an increase in resistance. One simply determines the...