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Andrew... unless you use a start-capacitor equal in size and voltage to the original one, you could expose the new capacitor, as well as the start-winding, to over voltages that will result in failure. I suggest you search Control.Com archives for other threads that discuss the reason. If you...

DAGaj... I don’t doubt the veracity of your comments regarding Harmonics! I just wanted to alert you to unscrupulous companies selling modules they claim will eliminate harmonics, correct power factor, and save energy. Furthermore, THEY WILL EVEN PROVIDE A WRITTEN GUARANTEE that a formidable...

Gary... can you provide some detail as to what "burned"? Was metal melted? How about photos? Regards, Phil Corso (cepsicon[at]AOL[dot]com)

Sekar... can you identify the Protective Relay(s) that initiated shutdown? Regards, Phil Corso

Davy... what do you envision as "correction" to be applied at specific locations? My reason for the question is to find out if you have been approached by vendors who are promoting installation of "Harmonic Correction Modules", or something similar, to be paid for via an "Energy Savings"...

Roy… first addressing the 3-wire case: You probably are aware that the REF-protection method is rarely used on typical LV industrial-type xfmrs, whose capacity is about 3 MVA or less (of course, depending on the LV value!) If, however, you are considering a 3-wire system, without a neutral...

Henry,,, I suggest you read: http://control.com/thread/1026236772 Regards, Phil Corso, [email protected]

Roy... an immediate answer is not possible! Response time depends on your answer to, "Are you only interested in Xfmrs having a LV Secondary?" Regards, Phl Corso, [email protected]

Radhakrishnan... if I have interpreted your query correctly, then it seems like you need an Inverse LaPlace Transform refresher. You have confused constants in the Laplace domain with time-constants in the time domain. Following is a discussion on your three problems: (a)...

M.Iqbal Sarwer... I forgot to mention that Hydrazine must be added to the water. Regards, Phil Corso

Draining of water depends on duration of Layup. Regards, Phil Corso

Stuart… actually it is more complicated than just the two modifications you suggested. In fact, there are some twenty steps in the design of a power transformer! A key design-parameter is called the Area Product Ap, which is proportional to the core's Window Area, Wa, times the core's...

Paul... go to: http://www.1728.org/cyltank.htm Let me know if you would like to know history of website! Regards, Phil Corso

Paru... further to my earlier e-mail, how large are the secondary bus-bars connected to the xfmr's secondary bushings, before connection to the electrodes? Regards, Phil

Paru… you really want information for setting the OV/OC protection relay for a transformer serving an EAF (Electrical Arc Furnace.) It has multiple primary voltage taps. And, for those taps you listed the associated currents for just the 10 or so lower voltage taps, that is, 1.1In to 2.0In...

Paru... I presume: a) your question is a theoretical one, based on X-Amp and 2X-Amp taps located in the xfmr's primary (that is, primary voltage could be 100% or 50% of some nominal value); and b) your question is not related to taps in feeder conductors emanating from the xfmr's secondary...

Stuart... additional information can be found at: http://control.com/thread/1297944362 Regards, Phil Corso ([email protected])

Rezwan... What do you mean by the statement, "reactive component of power consumed?" Regards, Phil Corso

Stuart... 5-limb construction is used to meet height restrictions in mines, tunneling machines, and problems associated with overhead clearances for rail-transport. For simplicity assume the winding is a flat rectangular conductor, wound around a magnetic core (limb.) The area of the core...

PV... I must take issue with your statement there is 'no' circulating current. While in many cases it is immeasurable, it is always present. One need only observe, via a strobe-light, the small but present oscillation of the torque or power angle in generators that are paralleled. When...