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Bittu… let’s start by listing the key magnetic parameters of a two-winding iron-core transformer: o Ac = cross sectional area of the iron core. o Lm = magnetic-path (median) length. o Rm = reluctance of the magnetic-material path. If the magnetic-material property like permeability is...

Bittu... do you mean insert an air-gap in the ironcore on which the 220V primary, and 440V secondary windings are wound? Regards, Phil Corso

Qiuqiuaaa... before you fall into a state of math oblivion, like some of Control.Com's pony-tailed members, I suggest you read the book, "Calculus and Pizza", by Clifford A. Pickover. Regards, Phil Corso

Shai... in answer to your two questions about Multi-Ratio (not Multi-Winding) CTs: 1) Only one tap should be used. 2) Do not short the other. Regards, Phil Corso

XC-racer... sorry that my 31-Oct-11 (14:07) was improperly addressed. BTW, there are formulas for RC (snubber) circuits. And, there are also solutions involving diodes, Zeners, and Varistor components. Of course the latter require that nameplate data also be made available. Regards, Phil...

D- ... I asked Packzod for additional detail regarding his problem because it is correctable! Regards, Phil

WireMavin... contact [email protected] He has both the #2-#14AWG and #2/0-#14AWG sizes! Regards, Phil Corso

Packzad... I do not presume to have a solution, but, perhaps an experience will shed some light! Coincident change in amplitude and phase-shift could be indicative of a vibration phenomenon referred to as the 'Morton Effect!" It is associated with tilting-pad bearings or seal-to-shaft rub. My...

D-... a diode, unless a Zener-type, installed in parallel with the coil, will decrease the current decay-rate, i.e, increase load-release time. Phil Corso

XC_racer... any Electro-magnet details you can provide will be helpful. Regards, Phil Corso

Mauricio... further to my 26-Oct (09:33) response, following is a list of threads that you may find helpful: http://control.com/thread/964793748 http://control.com/thread/966276865 http://control.com/thread/999108469 http://control.com/thread/1026147477...

Maruicio... how does the "But" part of your comment reveal itself as a problem? Regards, Phil Corso

Instructor HVAC... the arrangement you observed is called a Corner-Grounded-Delta. It is a 3-phase, 3-wire system. I suggest you post a new thread because this thread is the Center-Tapped High-Leg or Red-Leg, or Bitch-Leg, etc. It is a 3-phase, 4-wire system. Regards, Phil Corso

MHM... you haven't provided much detail. So I will guess as to the breaker type. If the breaker is an indoor, horizontal-withdrawable type, then inspect the mechanical interlock between the breaker and the shutter that blanks-off the opening to the "energized" bus stabs, when breaker is...

NHM, GTG... check the "anti-pumpimg" ciruit; also called "trip-free" and "X-Y" circuit. See http://control.com/thread/1302811811 Regards, Phil Corso

Mellberg... Mellberg... a 4th topic I overlooked was "Ungrounded Systems." Phil Corso

Mellberg... normally a thread covers one topic. Unfortunately, this thread addresses three: o Connection of the ANSI Device # 89. o Explanation of how the LCI system is used to convert the alternator into a motor for accelerating the GTG machnery-train from standstill to near operating...

CSA... I must admit your behavior is consistent! So, then, you still don't know why the alternator which is connected to the Delta-side winding of the GSU must be grounded (NGR, NGT, or other, even though the GSU Y-side winding is already grounded? Perhaps, some one else can enlighten you...

CSA... Did I not adequately answer your 13-May-11 (13:23) post? Specifically addressed to me, you stated: "Because this thread started out asking why the neutral must be grounded if the transformer is already grounded. You said in your Item 5, they're not related. But it's still not clear...

AIM... In fact I'll make it very simple using batteries! If sill interested contact me off-forum. cepsicon[at]aol[dot]com