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Hussain... further to my earlier 02-Nov-10 (10:12), reversing field connection may inadvertently "kill" residual magnetism if system is fitted with a field-flash setup! Phil Corso

Pratyaksh... >>What is the difference between the >safety plc and conventional plc?<< And lot's of money! Regards, Phil Corso

Hussain... in general reversal of the source of excitation to a brush-type alternator has no effect. And now the Caveat: UNLESS the rotating part has some sort of over voltage protective component located on the field coil side of the field circuit breaker... such as a diode, an MOV transient...

ProcessV... I want to be sure I understand you so please answer the following question: Assume that an 18-phase Generating Station is to transmit 1 MW at 0.8 PF lagging, to a Receiving Station, then by your formula, only 570kW reaches the Receiving Station, and 430kW is dissipated in the...

Further to my 30-Oc-10 (13:20)... can one tell if a proposed Energy Saving device or PF correction device is a Sham, Scam or Con? The answer is yes! And it's rather simple. Contact me off-forum! Phil Corso (Cepsicon [at] aol [dot] com)

The LMPhotonics' site, "Are They A Sham, Or Do They Work?" is quite informative! I presented several studies to Florida's Department of Environmental Protection (DEP) dealing with essentially two types of "devices": small modules are called EES-modules for Electrical Energer Savers; and...

CSA... What did I say that led you to conclude I "said there is inherent "risk"...? I never suggested a solution to Sarmad's dilema. I only proffered some history that could explain GE purposely omitting an OFF push button, especially in light of your "catastrophic failure" comment. In...

Correcting an error in my 28-Oct-10 (23:21) post about the '95 Northeast Blackout... The 1,000 MW generator, affectionately called "Big Alice", was manufactured by Allis-Chalmers, not Louis Allis! Phil

CSA... perhaps GE may have purposely eliminated the DC-Driven L.O. pump's "Stop PB", as a result of the infamous Blackout of '65! The blackout was exacerbated by loss of "Big Alice", the Louis Allis 1000 MW generator located in NYC, which at he time was the largest generator in the world. It...

Electrics... I sense that you didn’t read the 2000 and 2007 related threads or you didn’t understand the mathematics related to the loss ratios. Therefore, let me know what additional detail you want! Phil

Kalan... paraphasing an oldER philosopher, "Ah, what fools we mortals be when asked to chose three!" Available to you, at no cost, is my paper, "Probabilistic Assessment of Equipment Safety Systems!" It compares the numerous methods you have expressed interest in. It also discusses the...

Electrics... a) No! The losses do not decrease as the number of phases increase! It can be shown that for the conditions given in Control.com Thread # 1026242304, regardless of the number of phases, the 3-phase case results in the smallest loss! Yes, even for the 1-ph vs 3-ph case! Also...

Electrics... further to my earlier advisory the original N-phase thread is: http://control.com/thread/964724872 Regarding your question about 4,6, 12-phase, systems; they substantially reduce ripple-voltages in DC-rectification power supplies! Phil

Electrics... see http://control.com/thread/1026242304 Phil Corso

Kefi_netc... What is the receiving-end load? Regards, Phil Corso

Process Value... It is highly unlikely that the speed sensors will operate simultaneously, thus, providing a natural delay of several milliseconds! Phil Corso

Bishnu... your question is a good one. Although, the effect taps have on load-flow and fault-duty studies is seldom considered it is clear tap-changers can influence accuracy of those studies. To give you an idea of the variation that influences the theoretical effects, following are several...

Manoj... are you referring to the starting-current of a dual-voltage or dual-speed motor? Phil Corso

Sr... how many of the previous posted actions did you investigate?

CSA... "Low currents would indicate low flow." Only if supply voltage is nominal or lower! Regards, Phil