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Responding to R. Subra's 09-Apr-10... are you interested in logic-implementation having zero network time? If so, contact me off-list! Regards, Phil Corso (cepsicon [at] aol [dot] com)

Kumarash... All answers thus far presume your generator is connected to a Grid. Is that the case? Regards, Phil Corso

Electrics... Yes, tripping-action can be delayed! The "why" can be found in the Control List Archives, specifically: o Thread # 1231840606. o Thread # 1249166710. Regards, Phil Corso

Robin... can you scan and forward the pertinent pages of Mr. Richardson's book to me? Regards, Phil Corso (Cepsicon [at] aol [dot] Com

Abel... The instant the secondary is open-circuited, the primary current Ampere-Turns will be substituted for the normal excitation AT. Thus producing extremely high secondary voltages in just a few milliseconds! Regards, Phil Corso

ALan... yes! They are flat, and made of Class F or Class H insulation dimensioned to fit between stator winding for the entire slot length. Regards, Phil Corso

Umar Farooq... how about some basic data: 1) Engine - Hp, and Rpm? 2) Generator - kW, V, A, Rpm, and rated PF? Also its maximum kVAr output based on its excitation capability! 3) Utility Xfmr - kVA, V, A, and percent impedance? 4) Motor - kW, V, A, Rpm, and locked-rotor kVA to kW...

Aha, the plot thickens. How about forwarding a Single-Line-Diagram! Regards, Phil Corso

Pmmeeran, further to my earlier reply... Q3) Any other precautions? A3) Yes! Metering and Protection circuits must me modified to account for polarity change Phil Corso

Responding to Pmmeeran's 15-Mar-10 (16:10)... in answer to your questions... Q1) Add an 11kV Earthing System? A1) Yes! I certainly recommend an earthing system be added to the 11kV system! This reduces "iron-core" damage to the 20MVA transformer, generator(s) and other xfmrs, if connected...

Electric... voltage-drop and conductor-loss are 2.67-V, and 2.22-W. respectively. If you want the calculation method, contact me off-list. Regards, Phil Corso (cepsicon[at] aol [dot] com)

Electrics are you interested in comparing electrical and magnetic circuit parameters, that is, Force, Flow, Opposure, Intensity, Density, etc? If so, contact me on- or off-list! Regards, Phil Corso (cepsicon [at] aol [dot] com}

JB, have you searched the Contol List's Archives? Regards, Phil Corso

Danesh, during my ESD/SIS/BMS life I supplied quite a few flame-safeguard systems for bottom-fired HPI Plant process-heaters. Unfortunately flame-loss detector (FLD) failure-rates (regardess of vendor) are quite high... and can't be modeled using the often quoted "bathtube" reliability curve...

ABC... the simple answer to your question is, of course... Yes? The non-simplistic answer is, of course, "What are the test results?" The so-called "Condemning Limits" a term coined by one of my Employers’, a major supplier/user/marketer of transformer oil, was to seek advice from: o...

Dip... The value your supplier came up with is correct if he used inches instead of feet for the Radius of Gyration. But the real error is that he ignored the true definition relating Metric Units to English Units. The definition was given in my 03-Nov-05 response to the Thread's originator...

Rab... is the prime-mover a condensing or non-condensing turbine? Regards, Phil Corso (cepsicon [at] aol [dot] com)

Laxmikanta... if the prime-mover's output matched the generator load (ignoring losses) the system should not have sped up! The question to ask, then, is what caused the energy input to increase rotational speed (frequency) so that the over-frequency relay tripped? A good start to your...

Rao... are you seeking general information? Or do you have a specific application, i.e, regarding rotating-machines, transformers, or transmission systems? Regards, Phil Corso

CSA... admittedly your "Spellcheck" abilities are four times better than mine. While my error-rate is 1 in 10, yours was only 1 in 40! Keep up the good work! Regards, Phil