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Ashraf... my e-mail address is: Cepsicon [at] aol [dot] com

Panthripu... if the CT secondary’s are delta-connected, then how are the watt-meter 'coils' (or other measuring elements) connected? Regards, Phil Corso

Ashraf... I used AOL Search Engine. If you still have difficulty, please contact me off-list! Phil Corso

Ashraf... "Eng-Tips" Thread # 666-144149 Phil

Carloc... 12 Vac represents about 5.5 percent of the motor's rated voltage. And, at start, the motor's impedance is about i/5th of nominal. Thus, it is unlikely the motor will develop enough torque to "breakaway" from its stopped position. Furthermore, the current produced, even if below...

You Now... Single or three-phase? Regards, Phil Corso

Asraf... Search "Eng-Tips!" Regards, Phil Corso

Electrical Alex... you did not mention nameplate values for output kW or Hp. Thus, based on the data you provided: kVAi = Sqrt (3) x Vi x Ai kWi = kVAi x Pf kWo = Eff x kWi Hp (Imp Units) = kWo / 0.746, where subscripts (i) and (o) represent Input and Output parameters, respectively...

Roy... I would like your help. I am developing a mathematical model for the phenomenon covered in this thread. And recollection of your personal experience with the grinder would help: 1) Single-Phase or 3-Phase. 2) Cap size in uFD or kVAc or any info relative to motor size. 3) If...

James... Sage advice! Phil

Roy... that was not Resonance! Regards, Phil

"... how long is long?" This problem is similar to the other "... how infinite is infinite?" On a lighter note, consider the following OVH transmission line problem: Suppose you had two synchronized (and connected)alternators. About 100 miles away, they are to be connected together, again...

Tauck... Please provide the following information: 1) Size of your generator. 2) Is the application one of overcurrent backup? 3) Is the generator operated in parallel with others? 4) Is the generator supplying a plant Load? Regards, Phil Corso

WB... simply put, the 5-leg design, and yes, there is 4-leg design, overcomes some electrical and mechanical constraints associated with 3-leg transformers. The term 'leg' (also called 'limb') refers to the number of vertical magnetic-structures, called, vertical 'yokes' employed. The 3-leg...

Sensorless... Please provide the following: 1) The three line-line voltages. 2) The three line-to-ground voltages. 3) The three line currents. 4) The motor ameplate data. 5) Are you using a "true" RMS reading test Instrument? Regards, Phil Corso

Rashid... I believe your first-step should be to confirm the type of fault that occurred! Regards, Phil Corso

Seshadri... see the following control.com topic: http://control.com/thread/1281070067 Regards, Phil Corso

Jacky... (a) Reur Xm comment: I don't quite understand your comment that, as test voltage increases, Xm decreases. Can you provide a calculation illustrating your observation? (b) Reur Rc comment: Because Rc represents the winding resistance, as well as the core loss. Regards, Phil Corso

Charz... Thanks! Phil Corso

Adeel... While your investigation of the problem continues, I suggest the following plan to eliminate unwarranted shutdowns: WINDING TEMP RTDs Reconfigure the tripping logic from 1 of 3 (Non-Voting) to 2 of 3 (Majority Voting!) However, instead of setting all three (3), just set two (2) to...