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Ismael... at the time he wrote his paper, he had no specific physical design im mind! Regards, Phil Corso

Gitesh... is the tertiary set, the one you called delta-connected) open-corner connected? Regards, Phil Corso

Daniel... contact me off-list and as a start I will send you the differential equation for arc-current. Regards, Phil Corso (cepsicon[at]AOL[dot]com)

Daniel... have you had Differential equations, yet? Phil Corso

Daniel... further to my earlier post, it is not easy to analyze arcing-current. But, if that is what you need, then it can be represented by a sparkover-gap device, having intermittent current flow for each 1/2-cycle of the sinusoidal driving voltage. If you would like additional information...

Vijayakumar... your measurement indicates the fault is on the exciter side of the rotating diode disk. The value measured, 10 kOhm, is not particularly dangerous even it was located in the main field. The danger comes if a second fault occurs. However, I would suggest that you repeat the test...

Daniel... is this a demonstration unit for an Electric Arc Furnace? Regards, Phil Corso

Inam... sounds like Under & Over frequency settings are arbitrary. Have you conducted the the classic 2-machine transient-stability analysis? Regards, Phil Corso

Gmndarake... this is the classic problem, i.e., "Which came first, the chicken or the egg?" So, did the grid CB open first, or did flame-out occur first?

EC&I Engineer... I can't provide you with a proposal. However, I would like to tell you of a related experience: In my youth, I was responsible for group of electricians whose task was to return a repaired core & coil into its tank. On the last task, installation of the insulators, an...

Sensorless... good start! A myriad of problems can occur during installation. Checking of Insulation Resistance (IR) using a Megger (Biddle or equal) Instrument, at the very least, will establish a baseline for future monitoring of insulation health! Regards, Phil Corso

Sou... see http://www.Control.com/thread/1268111031 Regards, Phil Corso

Namatimangan08… As CSA said the information you seek could be obtained from the generator manufacturer. However, one reason it isn’t readily available is that operating with such low loads raises concern about stability. Furthermore, I don’t agree that the deviation is in the order of 1–1.5%...

Zafar... the comment >> if the same generator is operated at 1.0 PF, it will have a real load of 400 kW and a reactive load of 0 kVAr << was in Jojo’s 13-Sep-09 (12:11) post! Regards, Phil

GOPINATH... if you are addressing my response to the thread, please contact me off-forum. Regards, Phil Corso (cepsicon[atAOL[dot]com)

William... an accepted Rule-Of-Thumb (ROT) is that the Ampere-Unbalance-Factor (AUF) will approximate the square of the Voltage-Unbalance-Factor (VUF)! For the value you observed, the VUF is about 5.5%, thus requiring maximum de-rating of the motor, per NEMA standards! Regards, Phil Corso

Zafar... please repeat your request to: cepsicon[at]AOL[dot]com Regards, Phil Corso

BD... please provide the following measurements from which you concluded "secondary voltages are unbalanced": o primary phase-to-phase voltages. o secondary line-to-phase voltages. o secondary phase-to-neutral voltages. o secondary phase-to-earth voltages Regards, Phil Corso

Zafar... I will be out of my office for a few days. Your e-mail was probably interpreted as "Spam", and sent to my "Your Attention Required" file. I will return in a few days, so hang on! Regards, Phil Corso

Dilip... further to my earlier reply, I like to know why you never responded to Control.Com Thread #: http://www.control.com/thread/1257876382 "Parallel Operation of Transformers" Phil Corso