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Stacy... so the final lineup is: o T1 (112MVA) between the 230 and 24kV busses. o T2 (100MVA) between the 115 and 24kV busses. o T3 (650MVA) between the 115 and 24kV busses? Hopefully you recall that all three impedances must be converted to the same-base before one can proceed with...

Stacy... If I have properly interpreted your query, the problem is quite different! Mani's case consisted of two Xfmrs having HV-side voltages that were reasonably close, i.e., 70kV and 67kV. In your case one HV-side is double that of the other. Can you provide some detail about how their...

Charz... is the 440V-bank rated at 50 or 60 Hz? Regards, Phil Corso

Javid... go to the following Control.Com Thread: http://www.control.com/thread/945203361 Regards, Phil Corso

Saheed... Bringing copper-bus to annealing temperature will restore its ductility without harming its electrical, chemical, and mechanical properties! CAVEAT, make sure other devices, like CTs and connecting hardware (eg, Belleville-Washers) are not attached! Regards, Phil Corso

Engineer... did you mean the physical placement of the phase-winding around the periphery of the motor's stator? Or did you mean the Load-Angle associated with the machine's Power-actor, that is, the displacement-angle between Terminal-Volts and Line-Amps? Regards, Phil Corso

Raman... which type of generator is it... brusless meaning with a static exciter mounted on shaft, or brushless meaning permanent-magnet rotor? Regards, Phil

Dan... send your e-mail address to: [email protected] Phil

ZXZ... have you worked with IEEE Std 421, covering "Excitation System Modeling?" Regards, Phil Corso

Ali Shakarami... the information submitted is indicative of a severe starting-current unbalance, resulting in uneven heating of the generator’s rotor! This effect is caused by the negative-sequence component in starting-current, thus causing misalignment between the generator and gearbox...

Operation... further to my earlier post: 4) Is the STG connected to a local or aux bus supplying loads considered critical for the safe and orderly shutdown of the STG? Phil

Ali Shakarami... please answer the following questions: 1) Does tripping alway occur when operating in island-mode + 2 genr's, or is it random? 2) Capacity of the three generators? 3) Rated-speed of motor (2-pole, 4-pole?) 4) Plant-load at tiime of starting motor? 5) The expected...

Operation... you mentioned STG parameters for both "disturbances" were OK! Can you provide: 1) The pre-and post-trip MW, MVAr, Volt & Amps, values? 2) The trip (or alarm) setting for the Rev and Lo-Fwd Relays, in percent of STG rating? 3) The relay Manufacturer? Regards, Phil Corso

Dan.. can you convert a conventional ladder-diagram into Boolean logic? If so, I can send you a typical schematic-diagram! Phil Corso

Cntrldan... as a start try: http://www.control.com/thread/1026154799 Regards, Phil Corso

Kaylan... in most cases a little less than its Namelate rating in kW or HP! Regards, Phil Corso

Shaheed... is your intent to use it for protection against sudden "Islanding" or Loss-of-Grid disturbances? If so, then the first step is to determine the Rate-of-Change of frequency of your generator! Do you have the parameters to conduct such a calculation? Or, you might me able to...

Shaheed... please send me the manual! Regards

WATT... an excellent question! It is really the crux of Super-Grid problem … transferring both power and VAr, over a myriad of interconnections (see http://www.control.com/thread/1026242714 for my bear & wall story!) First, the answer to your seemingly simple question... Yes, VAr 'flow'...

AryanPanthri... DGA values alone aren't necessarily a good measure of oil integrity! Trends in a year's time might be indicative of normal aging of oil! On the other hand, an increase of 10% in a month might be a sign of an incipient fault! Often, the ratios of gas constituents are more...