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To Jack... yes, harmonics To Rukevwe... if you are satisfied, how about Waukesha's? Phil

Rukevwe... The simple answer is yes. But, first insure that the existing switch-gear fault-duty (especially ground-fault) is not exceeded with the CAT gen-set connected to it, while the others are operating. Regards, Phil Corso

Miquel... obtain a copy of the May, 2015 issue of "Power Magazine", pages 22-25. It contains an article titled, "Batteries Are Carving Out Space on the Grid" revealing Southern California Edison's (SEC) installation of a 260 MW storage-resource. It uses Li-Ion Batteries and will cover about...

Alex... Do a search of Control.Com Archives for "Tank Volume" Regards, Phil Corso

Miguel, the copy of the "Gortz" study I obtained lacked specifics. I believe, however, the "doubling" effect is related to a principle, thought to be possible in the 1980s. It was tried during development of a DC power source for the "Rail-Gun" (also called "Space-Gun" and "Smart-Rock")...

Miguel, kWhr is the unit of energy provided by a battery! Can you reveal the technical reference (literature/source) claiming "a study indicated that a battery energy storage can double its nameplate capacity when providing regulation service..." Regards, Phil

Miguel, your query is not simple to answer. As a start, I suggest you obtain the 2012 study by The Global Energy Institute (GENI), authored by Andreas Oberhofer. He has shown that there is no clear winner amongst the 3 technologies you are comparing. For example, while the highest efficiency...

Ak... your subject, double-break contacts, was covered in a May, 1999, Control.Com thread. Unfortunately it is no longer archived, so here is a synopsis: In general an improvement can be realized! But only because of the randomness associated with which contact opens first. I know of only one...

Assylbekm... Yes, 2 of 6 is a legitimate logic term. M of N voting has many applications! Nuke's use a 2 of 4 strategy. Even supplied a 3 of 75 SIS system some years ago! Regards, Phil Corso

Amrit... Apples and oranges! Acceleration, or run-up, or starting time, is in the order of seconds! In fact, acceleration of typical-design motors (say < 1,000 Hp, < 6-pole) is under 2 seconds! On the other hand, unbalanced operation can persist for months or years! The proof is...

Amrit... Answer to your 'Motor-Start' question: No! Unless the supply is unbalanced Neg-Seq current is not present! Answer to your 'Running Motor' question: No! Neg-Seq current is not higher in amplitude than Pos-Seq current. Instead, double-frequency eddy-current are made to flow in...

Amrit - Both locked-rotor current (as related to the number of starts) and unbalanced-supply voltage affect life expectancy! However, it's my view that sustained UV operation is more dangerous because the effect is not readily observed! Can you provide more detail on your comment...

SMK... it's being done all over the world! Search Web for Wind-Power Apps, Marine Industry! Regards, Phil Corso

Barindra... Use Control.Com's "Search The Site" box and type in +hunting. There are some 450+ posts! Phil

Sparky: If I have interpreted your dilemma correctly, you are trying to feed a 480V, 3-ph, delta-connected load from a 240V, mid-phase-grounded (Hi-Leg) power supply! The interposing Xfmr is Delta-Delta, wired as hi-leg, but the X4 terminal (presumably used as the mid-phase ground...

Sparky312... Providing a sketch would be helpful! Regards, Phil Corso

Amrit... provide some detail, on or off-forum! Phil

Barindra75... I suggest you search the Control.com archives. Some 70 threads are listed! Regards, Phil Corso

Bruce... Surely you remember that "Weight" divided by "Gravity" equals "Mass"! Phil

Alsibub, inrush usually relates to current and MVA, never MW. What are the actual nameplate parameters of: 1) Generators; MW, kV, A, and Pf? 2) Motors; MW, kV, A, and LRA/FLA ratio (Locked-Rotor-Amperes to Full-Load-Amperes)? Regards, Phil Corso