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Pandc, I just learned of a solution by ALSTOM. It uses an optically-coupled current-sensor to monitor the Xmfr's no-load current. It was proven by a collaborative effort between ASTHOM and FP&L, in Florida. Phil Corso

Pandc, Search Internet for an EPRI 2013 Report: "Nuclear Maintenance Application Center: Development and Analysis of an Open Phase Detection Scheme for Various Configurations of Auxiliary Transformers!" Phil Corso

Pandc, you have to ask Amrit! Phil Corso

Shahvirb, you may be aware that some posters to this forum get upset when formulae are used. If not, would you mind if I started with a typical generator, i.e., stator, rotor, exciter? Rehards, Phil

Shahvirb... I suggest you specifically investigate how synchronizing-power, synchronous-reactance, and armature-resistance, all affect performance of paralleled alternators. Regards, Phil Corso

Shahvirb... does your last post mean that your original query has not been answered to your satisfaction? Regards, Phil Corso

Makban... in order to reduce the amount of verbage, thus far committed to this thread, why not forward some measured operating values. For example, I suggest V, A, MW, MVAr, MVA, Field V&I, temp, etc, comparing the troublesome-unit to a properly operating-unit. Regards, Phil Corso

Fuddy... what is current range? Regards, Phil Corso

Engineer... Are you referring to an Induction-Generator? Such a generator would require capacitors if it was in operation while isolated from a source of Reactive VAr. Regards, Phil Corso

Goku... is there a sngle-phase, 208V load? Regards, Phil Corso

Bruce, I responded to your 03-Mar-'15 (2:19pm) post. Phil

Bruce... Hopefully you aren't suggesting bypassing the furnace-purge part of the boiler's restart sequence. Regards, Phil

Akhil... I suggest you search Control.Com archives for: http://www.control.com/thread/1329770308 Regard, Phil Corso

Raul, protection is provided by installation of surge arresters on the gen'r side of the grid-xfmr! Typically, one set is located at the LV-terminals of the Grid-Xfmr, and a second set of special (expressly for machine-protection) at or nearer to the generator(s) terminals! If connection...

Mawais... sounds like CT-Burden is too high! Regards, Phil Corso

John... What is the magnitude and frequency-range of the sq-wave? Regards, Phil Corso

Further to my earlier post... prioritize your investigation. First, concentrate on data-collection. Then, corroborate that CT secondary-circuit leads are correctly phased. Lastly (and least)... although possible, the probability of an error in rotor-current measurement is nil.

Tharris... kVAr imbalance can be solved using parameter values. It's simple approach, but take real work. A world of information can be gained from numberology. I found that Comparative Analysis usually leads to the solution. Hence, my usual first step is to request 'data'. Returning to...

Tharris... Q1) Was the 3-4 combination inadvertently omitted? Q2) Did kVAr imbalance start after AGS installation? Q3) If answer to Q2 is 'Yes', then were CTs added and/or reconnected? Q4) Have observed/metered Ampere readings been corroborated using a Clamp-On CT? Phil...

Tharris... the reason for the 30% difference in kVAr can be found in the following Control.Com thread: http://www.control.com/thread/1419896241, "The Physics of Tap-Change." Specifically, read the Jan-08 post. When applied to your case, it illustrates that lagging-kVAr is produced when...