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NKT... typically, the allowable tolerance is +/- 10. 1) The difference will not affect its load carrying function. 2) More important are the copper and iron losses. They could have a significant impact on operational cost. 3) Yes, fault-current will decrease, but it's insignificant...

Rama... I suggest you search Control.Com Archives using the term +"Current Trans", in the SEARCH THE SITE box. There are some 35 CT threads! Regards, Phil Corso

Lakmalp... the most likely reason is the system designer wanted to minimize ground/earth-fault current. Regards, Phil Corso

Barindra75... you must advise someone in authority about what you have observed! You, your fellow workers (including management) visitors, people in surrounding communities, etc, are in a very, very, very precarious situation! I suggest you search Control.com Archives for flame-detectors...

Pritful... are you referring to a distortion of the voltage or current wave-shape? Regards, Phil Corso

Barbican... The voltages and speed should not, repeat, should not be the same. I believe you need to review your Synchronizing Procedure! I suggest you Search Control.com's archives for "Sync" or "Synchronize" Phil

CSA... you're welcome! Phil Corso

Vinayak... returning to your original query related to "MW Hunting"... what has transpired since 7-Nov? Phil Corso

Barbican... just prior to closing the breaker used for synchronizing: 1) What is the difference between the two voltage magnitudes? 2) Which one has the higher voltage? 3) What is the speed-differential between the two? 4) Which one is the faster? Phil Corso

Azizam... this seem to be a copy of what was posted on thread # http://control.com/thread/1445226180. Following are several questions asked on the first thread: 1) Presuming the Xfmr's are in parallel, can you send a simple SLD or hand-drawn sketch with pertinent data? 2) Also include...

CSA... hy did you suggest to Saied that he obtain a copy of my "Physics of... Armature Reaction" paper? By your own volition you refuse to address it! Too bad! If you had read it you'd know it doesn't address the AVR impact on MVAr!

Saied... I suggest you avail yourself of Control.com Archives. You will find a wealth of meaningful data. Just use the Control.Com "Search the Site" Tab, by typing in 'MVAr' or 'kVAr'. Phil Corso

Saied... If you want additional info I suggest you read: http://www.control.com/thread/1026245130 Regards, Phil Corso

Krishna... Alern'r and GSU Xfmr parameters, please. Regards, Phil Corso

Diaa... BTW, Archie Hebert's comments in the referenced thread are apropos to your situation. Phil

Diaa... Hmmm... CSA hasn't asked yet... but is problem new, or has it existed since commissioning? If the latter then it's my "guess" that engine/generator has too little inertia. You said both generators are in parallel at the time! They lose sync when load changes! How much, 20kW...

Diaa... Data please: 1) Is the generator's prime-mover a combustion engine? 2) What is the combustion-engine's Hp or kW capacity? 3) What is the Generator's capacity, kW? 4) What is the maximum load requirement, kW? 5) Are load-changes in steps? 6) Are load-changes ramped over...

Barbican... what you are "seeing" is a high circulating-current between alternators. It is the result of their internal EMF's (technically Air-gap voltage magnitudes, Egp1 and Egp2) being unequal. What are their terminal voltages, Vt1 and Vt2, before the synchronizing breaker is closed...

Azizam... further to my earlier post: Nameplate should hold key. Please post Nameplate data on this forum. Phil

Azizam... presuming the Xfmr's are in parallel, can you send a simple SLD or hand-drawn sketch with pertinent data?<b>*</b> Also include the number of taps provided in each Xfmr. Regards, Phil Corso <b>Moderator's note:</b> You cannot post attachments to the forum. Please use one of...