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Greggb... did you not see my offer of a Nomogram solution. Phil Corso (cepsicon[at]aol[dot]com]

Driveguy... try KB Electronics. E-mail address is: [email protected] I know nothing about them, but they are quite close to my home. I could check them out if you want! Phil Corso

CSA... yes! BMP... before I rule-out lightning I would check all lightning-related protective devices and components for physical damage! Regards, Phil Corso

CSA... using the KISS principle here are the answers: 1) What form would the inertia take? Rotating mass! 2) How would the inertia be attached to the shaft? Details, Details! 3) How would the addition of inertia affect the power required of the starting means to break the unit away...

Syd_tychy... You will find a myriad of companies that claim to sell "Energy Savers!" Unfortunately many, if not most, are Scam artists. I suggest you read Control.Com Thread http://control.com/thread/1026163880 "Industrial Energy Saver (Devices)" Regards, Phil Corso

William... Are Phaseback's Warranties made available to the public? Regards, Phil Corso

BMP... a possible method is to add inertia to retard the deceleration-rate. Start with a Power-System Stability analysis using the "Stored Energy Constant" H, (MW-sec/MVA) of each machine. They are calculated from the Moment-of-Inertia, rated-speed, and rated MVA. If the two machines have...

Namatimangan08... adding to CSA's 03-May-11 caveat... didn't the original poster state the GTGs were "swinging" after separating from the grid? Regards, Phil Corso

CuriousOne... following are two threads that discuss the effects on a transformer's secondary-side loads when "Phase-Loss" occurs in the primary: http://www.control.com/thread/1026239176 http://www.control.com/thread/1284199900 Regards, Phil Corso

CuriousOne... BTW, what were the original fuse sizes? Phil Corso

Uma...I suggest you go to ABB's website. Regards, Phil Corso

Meziane... is the generator connected to its step-up transformer without an intervening circuit breaker? Regards, Phil Corso

CuriousOne... following are answers to your questions: 1) The 125% multiplier comes from the National Electric Code, NEC. It permits "primary" fusing at 125% of the transformer’s rating. 2) There are no standards I'm aware of that are against use of smaller fuses. 3) I can't visualize...

CuriousOne... as long as kVA through the transformer (in either direction) never exceeds 2,000 kVA, then, size the HV-side fuse as follows: Amp = [1.25 x 2,000kVA]/[Sqrt(3) x 13.8kV] = 105 A. Caveat: If the transformer is used to power the 4.16kV bus when the DG-set is unavailable, then...

CuriousOne... please provide the nameplate kVA ratings for both the DG-set, and the step-up transformer!

Curiousone... does transformer have a Forced-Air-Cooling rating? Regards, Phil Corso

RY... how was problem resolved? Phil

Hector... contact me off-line: Phil Corso (cepsicon[at]aol[dot]com)

CSA... of all the failure-modes you described, exceeding the "Number of Starts/Hr" rule is not very likely to cause a ground- fault! Regards, Phil

Mark... if you are interested in knowing which connection is the most reliable, I suggest doing a Reliability Analysis! If you are interested, the formulas can be found in my SIS Paper, "Probabilistic Risk Assessment of Equipment Safety Systems" More detail can be found at...