Search results

For pmmeeran and markvguy... still further to my 18-Dec-06: While I discusssed a course-of-action involving calculation, there is yet another, even easier, technique you can use to aid your trouble-shooting efforts. I apologize for having forgotten it. Search List Archives for thread #...

Further to my 18-Dec-06: pmmeeran... provide nameplate data for speed (actual, not synchronous), NEMA design-torque curve if USA design, or DIN design-torque curve if metric, ambient temp (actual and rated), and temp-rise over ambient. Finally, what is typical acceleration time (actual, not%)...

Markvguy, reur 18-Dec-06, 6:53 pm... thnx, it certainly cleared things up: So, as I now understand it, the speed-amp data was that of the motor, while driving the torque converter, with the converter driving the gt rotor. Hence, during acceleration of the gt rotor, the motor is running at...

Pmmeeran, because motor is 1,800 kW, 6.6 kV, my comment regarding stator wire size as a potential problem can be ignored! Regards, Phil Corso, PE {Boca Raton, FL, USA} [[email protected]] ([email protected])

Responding to Mark's 11-Dec-06, 10:40 pm query... I note that this post is from the Humorous dept, but if you do it you won't be laughing all the way to the bank! On a more serious note, if both motors are connected to the same driven-machine (in-tandem or mechnically in-parallel) and unless...

Further to my earlier response to pmmeeran... there is a discrepancy between motor's nameplate output, 184 kW, and its full-load current, 181 A. Can you clarify? Regards, Phil Corso, PE {Boca Raton, FL, USA} [[email protected]] ([email protected])

Responding to pmmeeran's 12 Dec 12:20 pm data... you have supplied speed vs torque (torque is proportional to Amperes) curve. It does not reflect acceleration. I suggest the following: 1) Acceleration. Plot both speed and Amps vs time. Since dV/dT represents acceleration, you can...

I've finally completed the white paper promised some eons ago. The "text-only" version has proven to be quite long, so it will not be posted here after all. If anyone wants the full, unabridged version, just contact me! Regards, Phil Corso, PE {Boca Raton, FL, USA} [[email protected]]...

Responding to Anonymous' Nov 28, 9:14 pm comment.... I'm impressed: You're one of few posters that has correctly applied the rules of capitalization, i.e., names of people! Furthermore, you correctly use the lower case "r' to denote reactive power! Then why did you not apply the...

Responding to ch.thrimurthulu's Nov 19, 7:12pm query: For some background info see thread # 1026227677 covering the application of a Neutral Grounding Transformer (NGT) for your application. For the paramters you provided, ground-fault current is approx 3 A. To check adequacy of the...

Responding to Abby's Nov 15, 12:35 am inquiry: 1) Function A generator's current contribution to an electrical fault at (or beyond) its terminals, decays exponentially at a rate determined by the time constant, Ta. 2) Magnitude Basis. Ta is simply the armature (stator) winding's...

Responding to Anonymous' Nov 12 4:07pm queries... power loss is best determined by actual input power measurement. If such a technique is unavailable but capacitor case size is known, then temperature-rise over ambient will yield a good approximation! If additional info is required, let...

Bill, Are these for the Amoco-BP refinery in Whiting, IN? Phil Corso, PE

Responding to Anonymous' Oct 26, 6:03pm query... send me your e-mail address! Regards, Phil Corso, PE {Boca Raton, FL, USA} [[email protected]] ([email protected])

Responding to George's Oct 24, 7:04pm query... of course, both are used but the NGT method has a unique advantage: NGR uses a limited-duty high-voltage resistor. This precludes extended operation under fault-conditions. Typically, then, immediate tripping of the generator is necessary...

Responding to Anonymous' Oct 15, 10:33pm query... the effect of frequency variation (and voltage) are shown in NEMA (National Electrical Manufactutrers Association!) standards! Regards, Phil Corso, PE {Boca Raton, FL, USA} [[email protected]] ([email protected])

Responding to Dboy's Oct 12, 10:53am query... increasing capacitor size will increase RPM, but only marginally. Explanation. You are probably aware that the major advantage of the permanent-split capacitor motor is its reversibility. And, because both windings are identical, the capacitor...

With only "a single resistive heater element" connected won't the drive protective circuitry trip for current unbalance or single-phase detection? Regards, Phil Corso, PE {Boca Raton, FL, USA} [[email protected]] ([email protected])

Responding to Anonymous' Oct 9, 10:48am query... Dy1 is lag while Dy11 is lead! Regards, Phil Corso, PE {Boca Raton, FL, USA} [[email protected]] ([email protected])