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Jared Hankovsky... Please provide the following information: a) Transformer capacities. b) Primary and secondary voltages. c) % voltage-impedances. d) Primary breaker type, and rating. e) Protection Device(s), Type (digital or Stand-alone) and trip settings! Regards, Phil Corso

Dkguerry.... can you provide a unit-of-measure, i.e., grains per gallon, or mg per liter? Regards, Phil Corso

Anindya_Ray... As you had requested, the document was sent directly to your e-mail address! Please confirm its receipt! Regards, Phil Corso

Santanu... The disturbance question I replied to was just the opposite of what you described, and I apologize for the misunderstanding! Addressing your situation; is the faulted-breaker you referred to the 220kV breaker connecting the GSU to the transmission-line? Phil Corso

Santanu... if closure of the faulted-breaker at the instant both the generator-side PTs and the 330kV-side PTs (or those on both-sides of the faulted breaker) indicate they are "Synchronized" then nothing should happen! But, as soon as armature-current increases because of an action by the...

GJRS... please provide information on slip-ring material, brush composition, environmental conditions, current-density, and if both the positive and negative rings have similar images! Regards, Phil

Minh… your approach seems enthusiastic but I question your Electrical Power Engineering knowledge! I suggest contacting companies like Siemens, ABB, and others, that provide SECC apparatus! Contact me off-list if you want a technical critique of your solution! Sincerely, Phil Corso [...

Minh... have you completed the Steady-State Load-Flow Study? Regards, Phil Corso

Jerry... following are several Control.Com threads that discuss open-phase operation of xfmrs!! http://www.control.com/thread/1026239176 http://www.control.com/thread/1284199900 http://www.control.com/thread/1304477144 http://www.control.com/thread/1307209459 Regards, Phil Corso

EE... secondly, how were the Ohm measurements taken? Were they made with the delta intact, or were you able to isolate the three heating elements? Phil

EE... the measured ph-ph resistances, i.e., 20.0, 27.0, 20.4 don't agree with those calculated from the kW values and voltage you cited. For example the R related to the 9.0 kW heating element is V^2/(1000 x 9.0) = 25.6 Ohms! If the rated voltage is 460 instead of 480, then the calculated R...

Generator... I forgot to mention viirtually all wind-power applications have a Betz factor well below 0.59! Phil

Generator… following is a procedure you can follow: 1) Determine the area, A, swept out by the fan blades A = pi x (D^2)/4), where D =blade diameter 2) Determine the air velocity, V, of the air flowing through Area A! I’ll leave that up to you! 3) Determine the mass, M, of the air...

Rob... I suggest you search Control.Com Archives for Induction Generator threads! Regards, Phil Corso

Atta... It is [email protected] Phil Corso

Prasad... your explanation is in error because even though kVA, hence armature-current, increases, the amp-to-torque analogy doesn't apply! In fact, for a 3-ph near-terminal fault the generator will speed up because the load kW is suddenly lost! Hopefully you will conduct a study to...

Dragan... Dave Amundson makes two excellent points that I completely overlooked. Based on his astute observations, I withdraw my earlier support for a plan to couple the two machines without additional study! Re: CSA's question "(....why is that, anyway; I've never understood that...!) from...

S.Zoghby, is absoluly correct. 1) There are qualified millrights that can properly couple and align the two machines! 2) I'm sure generator loss at the reduced load won't significantly impact efficiency! 3) I'm also sure that as long as generator output does not exceed the turbine's...

Abdollah... Followng is a scenario that illustrates why the unit should not be kept on line! Consider a ground on circuit X! Then, if a second circuit Y is suddenly grounded the protective fuse/breaker for both circuits, will respond, rendering both X and Y inoperable! In addition, for the...

Dhinesh... developed for use with advanced Pressurized-Water-Reactors, it features a double-flow saturated steam HP steam-turbine module and up to three double-flow LP steam-turbine modules! Disk-rotors are shrunken-on to individual shafts, which are then all coupled together in a single-line...