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Namatimangan08... rotor-angle, load-angle, power- angle, and torque-angle are used synonymously. See: http://control.com/thread/1259307998 Regards, Phil Corso

SKG... "One Picture is Worth a Thousand Words!" Can you provide a simple Single-Line-Diagram (SLD) or a hand-drawn sketch of system? Regards, Phil Corso (cepsicon[at]AOL[dot]com)

Sunil... based on the SLD you forwarded to me, your instinct that a CT change out is unwarranted, is correct! Regards, Phil Corso

Skg... before this thread becomes another "endless" (excuse the pun) on grid-size, can you provide a additional information, such as whether this is a new phenomenon, type of prime-mover, and size of GSU (if one exists.) Regards, Phil Corso

Hamid... if installation is in USA, then remote operation is specified in NFPA 70 (NEC), Article 420.72 (B)! Regards, Phil Corso

Sunil... location and ratios of the phase and neutral CTs used for the REF scheme is very important. Can you provide a simple Single-Line-Diagram (SLD) or a hand-drawn sketch of system? Regards, Phil Corso (cepsicon[at]AOL[dot]com)

MUHAMMAD... per your 15-Feb-12 (23:50): 05-Feb-12 (12:13) Phil C: Mohammad, further to my earlier email: Can you provide additional detail on the AE-102 and RMS-7990 Relays. Specifically, are they "Programmable Digital" units, and not stand-alone units? Phil C 05-Feb-12 (13:03) by Phil...

Prasad… these terms are used interchangeably depending upon the electrical apparatus you are speaking of: o DC Machines. o AC Alternators with DC excited field. o AC Alternators with PM excitation. Can you provide additional detail? Regards, Phil

Mustafa... your question is really an excellent one. In fact, %Z (impedance) and %V (% of rated primary-voltage to produce rated secondary-current with secondary shorted) are not exactly equal! But, approximations during testing are negligible in the interest of practicality! Let's start with...

Vinayak... start with George Younkin's post in the following thread: http://control.com/thread/1227039468 Regards, Phil Corso

Muhammad... your 14-Feb-12 (08:13) post directing me to review a Eng-Tips Forum, Aug '07 topic, suggests you did receive or understand my 06-Feb-12 e-mails to you. Do you want me to repeat my answers via the Control.Com Forum? Phil Corso

Pmmeeran... the randomness of trip-cause suggests you can’t diagnose the problem because the electrical parameters like, Volts, Amps, kW, etc, are software-based and derived in the Controller. And, it powers down when the gen-set trips. Thus, after a trip you are essentially playing...

Strangepeade... several questions, to start: 1) Does the intensity, and/or frequency vary with load? 2) Does the temperature seem unusually high? 3) Do the temperatures of the three coils differ? 4) Has the load appreciably changed in the last 60-90 days? 5) Do you have...

Pmmeeran... How is the 12Vdc control circuit derived? 1) If derived from a battery, is the battery also charged by the engine-genset? 2) Have you not referred the problem to Cummins because the machine is out-of-warranty? Phil Corso

Pmmeeran... What has Cummins said the problem could be? Phil Corso

Matembo... the information you provided is too vague Typically, modern day lightning arresters are essentially considered as maintenance free. Some older types were "testable!" Can you provide information such as manufacturer, IEEE or IEC classification, MOV-type, etc, so that a...

Muhammad... does the generator on the delta-side of the xfmr have its neutral earthed? To be sure I have properly interpreted your request can you send a hand-drawn sketch or simple SLD (Single-line-Diagram) to me at: cepsicon[at]AOL[dot]com Regards, Phil Corso

Tim... you probably have done some investigation of branch-circuit losses. Some advocate the use of Power Factor Correction (PFC) devices, for energy-use reduction. My study, to the Florida EPA, showed that increasing branch-circuit wiring for major appliances, by one-size, will achieve the...

Rutjoe... my question regarding application had to do with the fact that Utility Companies tend toward redundant systems. That said, I will address only your basic request for information. a) Voltage-Based. The most basic protection method is measurement of the bank’s neutral-to-ground...

Controman... please ignore my reminder about the photos. The data received thus far, does change some of my original comment. However, because there isn't significant detail, I will only venture a Best-Guess-Estimate as to the problem. A) 1st IBC (Inadvertent Breaker Closure) Event This...