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SCE... I suggest you compare conductivity of make-up water (post treatment) to boiler blow-down logs to approximate concentration of dissolved solids buildup. By comparison can approximate specific impurity accumulations since last planned outage! Phil Corso

We've had this discussion before... remember the "Hermits In A Cave Story!" See Control.Com Thread # 1026198752! Regards, Phil Corso

David... the energy available is rather easy to test. Just note the inlet pressure to your building, with and without water flow! Regards, Phil Corso

Gentlemen... the 3-Ph, 4-Wire, delta, provides 240/120V connection. Also known as known as the "high leg" or "red-leg" or "stinger leg", etc, has one phase center-tapped. The center-tap is the grounED phase. Furthermore, it is covered by the NEC! Regards, Phil Corso

Shift Charge Engineer... the lead-in paragraph states boiler performance is 70%, and the opening post discusses chemical measurement of the presence of scale. Are you asking if there is a chemical test to determine the quantity of scale within the boiler? Regards, Phil Corso

Frank... the answer is yes, but there are two concerns: 1) If the source is comprised of a single 3-phase transformer or three single-phase transformers (closed delta-connection), then make sure the source capacity (in kVA or Amps)exceeds that of the Oven's requirement (in kVA or Amps) 2)...

Gemi... Not to belittle the point but a "grid" that is subject to a frequency change of the magnitude you experienced is not considered to be an "infinite" grid. Regards, Phil Corso

Anthony... not bad for a lay person. Furthermore I'll give you a "plus" since your name ends in a vowel! If are looking for further enlightenment you might want to peruse Control.Com Thread # 1026242714 Regards, Phil Corso

Gemi... Jojo's reply triggered another thought: Is your plant-module under control of a an "Authorized" Grid Power Flow Control Organization? Phil

Gemi... I failed to include the most salient point in my earlier response to your 18-Aug-10 (20:24): 8. Because frequency changed, the system your plant-module is connected to fails to meet the definition of an "infinite" grid or bus! Phil

Gemi... responding to your 18-Aug-10 (20:24) comments: 1. I believe that the grid's frequency excursion was not instantaneous, but instead contained two time periods: the first, a decreasing magnitude having a negative slope; and the second, an increasing magnitude having a positive slope for...

Tauck... first some general comments. You understand that both the standard induction motor and the wound-rotor induction motor have squirrel-cage rotors, and the torque developed is proportional to current circulating in the rotor. The principle difference is that for the former its...

Venkataraman... I respect the use of Anonymity in some situations, but because I'm pretty much old-fashioned (not so much "pretty" but certainly "old") I prefer face-to-face (so-to-speak) communication. Before submitting a reply to your question, please send me your: full name; Company (or...

Gemi... following are my best Guesstimates regarding the two questions you posted, (1) cause of disturbance; and (2) unexpected generator responses: (1) Cause of Disturbance It is my thesis that the disturbance was indicative of a switching error within the grid network! The salient...

MA... a good start is to search the Control.Com Archives for thread # 1026244231. Regards, Phil Corso

Anonymous... the conversion from microns/sec to mm/sec is: mm/sec = 0.001 x microns/sec or mm/s = 0.001 x um, where in SI units, mm = millimeter and um = microns or micrometers. Regards, Phil Corso

Gemi... thanks for quick reply. A few more questions: 1) Are there 3 GSUs? Or are all three Gens connected to a single GSU Xfmr? 2) Is there significant impedance between gens and GSU(s)? 3) Are GTGs 2-pole (3000rpm), and STG 4-pole (1500rpm)? 4) If kV, kA, and pf readings are...

Abbs... search Control.com Archives for thread # 1026244231. Regards, Phil Corso

Gemi... what were 3-phase pre-fault, during-fault and post-fault electrical parameters, specifically terminal-voltage, line-current, and pf of the three generators. This data can point to type of fault! Regards, Phil Corso

SCE... voltage differences are the result of differences between the new and old Tap-changer step-intervals. For example, the new units may have tap-positions having a step-intervals of +/- 2.0%, while for the old units the corresponding tap-position step intervals of +/- 2.5%. The...