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Shaheed.... there are at least two ways to optimize starting-torque requirement. If you have stator and rotor parameters such as R1, X1, R2, X2, then contact me at [email protected]. Regards, Phil Corso

T. Sriram... can you provide the results of a typical DGA of the oil taken from the tap-changer chamber? Regards, Phil Corso

drkaos... there is strong evidence that low-frequency grid-oscillations are related to the connection of large, kVAr starved, wind-Farm Induction-Generators. A good start would be to search Control.Com Archives, as well as the Internet, fr, "Power System Stabilizers." Regards, Phil Corso

Runescape... your Phase-to-'Earth' voltage-measurements are indicative of a "floating" system. Probably due to line-earth capacitance. The magnitudes reveal some unbalance. To eliminate the existence of a "sneak-path" between the SSR modules and earth, I suggest you take an Ohm measurement...

Runescape... For the present configuration what are the phase-ground voltage measurements when a "Heater-element" is On? And when it's Off? Phil

Runescape... Thanks for the sketch! I still don't understand how an ungrounded/unearthed supply influences Heater maintenance. Are you experiencing intermittent failures of SSR control elements? Or is the supply experiencing phase-to-ground voltage excursions? If the latter, then you can...

MisterMystere... further to my earlier post: 3) Does the circuit configuration consist of three (3) KVL loops, where two (2) represent sources, and the 3rd has one (1) source and a cap? Regards, Phil

MisterMystere... you say there are 3 input voltages, and one output voltage? 1) Did you mean the capacitor has a "charge"? 2) How is capacitor connected? Regards, Phil Corso ([email protected])

RootBoy... Just caught a major error that I made in the "Qs equation": ORIGINAL Qs = (Vs/Xc)*[VsVr*Cos(θrº-θsº)] CORRECTED Qs = (Vs/Xc)*[Vs - Vr*Cos(θrº-θsº)] Please accept my apologies for the error. Sincerely, Phil Corso

Runescape... a simple Single-line-Diagram (SLD) or hand-drawn sketch woud be a great help! Regards, Phil Corso ([email protected])

Raj18... two questions: 1) What is outer-jacket material? 2) What is rated voltage? Regards, Phil Corso

Mike... can you provide more detail about the single-to-three-phase converter: 1) Is it a rotary-type? 2) Is it a static-type 3) What are the corresponding phase-voltages? Regards, Phil Corso ([email protected])

Was00266... Is this the same plant mentioned in: http://www.control.com/thread/1245027301 Phil

Was00266... 1) All can be evaluated, but there is more emphasis on the highest kV. 2) The calculation involves kV, kA, & fault-current duration. 3) No! Earthing-grids, Mats in USA, can be individualized, but all must be "bonded" together, with particular attention paid to any...

CSA... the equations were in the original post. Solution did not require complex math. Following are the conclusions one would have uncovered if they had been solved... using just High-SchoolmMath. 1) Power is transmitted if the two "Bus-Angles" differ. 2) VAr is transmitted if the...

Subhendu... additional information: The FLA of an 8-pole motor will probably be higher than that of the 4-pole motor. Thus, be sure that the motor's existing feeder-cable and protective device are adequate. Regards, Phil

Subhendu... yes, it will certainly reduce the current, that is, if the replacement motor's output rating is equal to the existing motor's rating. Caveat, It will also halve the speed, and increase the available torque from the motor. Check to be sure that the crane's hoist requirement does...

Ali, this will acknowledge receipt of your SLD. Following are several questions: 1) Do the current-values cited represent the Basler Relay's current-measurement upon switching on the 5.5kV CB of one 8MVA Xfmr to the 5.5kV, with its 3.3kV CB open? 2) Do the current-values cited represent...

CSA... No! Seven replies are not required! Thus far, there have been two; one On, the other Off-Forum Frankly, I am very suprised about the gloomy response to a basic tenet of power generation. Regards, Phil

David... are you currently measuring the fabric's thickness? Regards, Phil Corso