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Kelly Johnson... if it has anything to do with lifting boats or ships out of the water evenly, I suggest you look into a company called "Synchro-Lift!" Regards, Phil Corso

Ashutosh... perhaps my earlier question C) was unclear. Were the PT's and CTs on the supply-side or load-side of the Circuit Breaker? Phil Corso

Ashutosh... further to my earlier comments: C) Where are power measurement PTs and CTs located? Near the source of supply? Or near the Xfmr being energized? Phil

Ashutosh.... please clarify: A) How was the "power measurement" determined? B) Does your observation related to the "B" phase pole mean that only "A" and "C" phases were connected to the primary 33kV supply? Regards, Phil Corso

Shafi Khan Mohmand... in most cases it is sufficient to know the supply transformer capacity and its percent impedance! Regards, Phil Corso

Further to Curt's comments... if an opaque-type, and impossible to keep intact for analysis, then have it x-rayed! Phil

Sr... further to my earlier suggestion, I would test for a higher-than-normal inrush current to "input" capacitance. Smaller fuses have a low tolerance to high di/dt transients! Phil

Sr... fuses fail because of excess current flow. But, they also fail if when exposed to vibration, especially if they are very small! I suggest you first determine the mode-of-failure, that is, did the fuse "open" by "fusing" electrically, or "break" because of mechanical reasons...

Hanywepco... the simplest way would be to use a DC clamp-on meter to read the combined currents in the wire-pairs (pos/neg) associated with each output circuit! The unfaulted circuit will display zero-amperes. The grounded-circuit will measure the difference in current between the pos and...

SCE... are you sure the contamination is not biological? Regards, Phil Corso

Tauck... start with Control.Com Thread #1026233572. Regards, Phil Corso Moderators note: http://www.control.com/thread/1026233572

Tauck... several conditions will change the full-load current (with resistor-bank excluded from the starting circuit.) They are: A) A higher supply-frequency than rated. B) A lower supply-voltage than rated (increases current.) C. A lower rotor-winding resistance than original design...

Tauck... What was the frequency value? Phil

Kadhir... I forgot to ask: 6. What is the measured core-bore diameter of both the 75MW and 60MW stators? Phil

Kadkir... there are certain key factors used to quantify an alternator’s capacity. Since the OEM is out of the picture, and presuming both the 75MW and 60MW stators have similar characteristics, then as a start please answer the following: 1. What are the original nameplate parameters of the...

Ketan Shah... further to my earlier post, see Control.com Thread # 1026238626! Regards, Phil Corso

Ketan Shah... yes they probably can be paralleled! However following are several comments you must consider: 1. If they are to be paralleled on the 11kV side, then the increased short-circuit level produced by both generators must not exceed the capacity of the 11kV circuit-breakers and...

Trinity... assuming you haven't found the cause of the problem can you supply input phase and line-voltages and line-currents to the VFD? Phil Corso

T. Sriram... your response indicates, to me, that your problems and observations could be due to an inadequate earthing-plane (or earthing-grid! Following are additional comments: 1. How many PT failures have occurred? And, in what time period? 2. Have insulators (other then PTs) also...

Frank... if you would like a drawing depicting the exact situation you described, then contact me off-forum! Phil Corso (cepsicon [at] aol [dot] com)