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A) Conclusion The electrical parameters observed, namely, high-MW (about 20% of capacity) and unity-PF, following energization of the transformer’s primary-winding [with its secondary-winding unloaded] was erroneous! [Note, paranthesis by author] B) Incident History A fault in an outgoing...

Leslie... please provide more than name, rank, serial number! Is the genset operating in parallel with another? With others? Connected to a grid? Is it stable at one load? Are there problems with the prime mover? Is it big? Little? Is it old? New? Etc? Etc? Phil Corso

Stokely... my system, called Pretect, had a key-operated Bypass-Switch for for each input-tripping variable, and a key-operated Disable-Switch for each output-action variable. Regards, Phil Corso

Ashutosh... Don't worry, I have not forgotten you, nor your plight! You have to learn to be patient! Now that you have finally produced the "key" item I had requested early in the investigation, I can proceed with final development of the Mathematical model representing the incident you...

Ashutosh... yes, I have a theory. My e-mail address is cepsicon [at] aol [dot] com

DD and Liam... if you search the Control.com archives, you will find some 160 threads, related to Droop & Isoch-Mode operation, were posted... with little agreement as to what represented Fact of Fiction! Perhaps, you can present a fresh approach! Good Luck, Phil Corso

Sridaran... to eliminate the possibility of misinterpretation can you send drawing or sketch? regards, Phil Corso (cepsicon [at] aol [dot] com)

Ashutosh... repeating an earlier Caveat, "I no longer accept anonymous requests for information or help... something to do with the fact that anonymity breeds boorishness" Therefore, anyone seeking advice or help from me must go the extra mile, i.e., provide me with some personal...

Ashutosh... had you provided the info I asked for the answer would have been known a while ago. However, because of my hang-up with anonymity, please contact me off-forum for the solution! I want to assure you that no fee is involved. Furthermore, you are free to post any part, or not, of...

Mary... if your question was addressed to me, then there is some confusion. Power and power factor calculations are not related to valve sizing. However, perhaps your question is related to motor sizing? Regards, Phil Corso

Ashutosh... I understand your dilemma so you needn't have shouted! You may not think so, but, thus far, your answers have proved helpful! However, I need two more pieces to solve the puzzle. So if you're up to the task, please answer the following questions (you have my word, they will be the...

Rowan... further to my earlier post, controlling the 3-elements of a wye-connected resistive-load requires the supply to be 3-phase, 4-wire! Phil Corso

Markinnh... are you sure battery capacity was(is) 250 A, and not 250 Amp-Hrs? Regards, Phil Corso

Rowan... zero-crossing is not useful in varying a resistance-type load by varying the "on" time per cycle. However, it is used for "burst-control" that is, several cycles (per-phase) "on"; several "off!" regards, Phil Corso

Jojo... I suggest you run the numbers to determine the physical size associated with a dual-winding alternator’s phase leads, and its neutral connection! AJ... more later. In the interim: (Q1) Can you send info on the distribution xfmr capacity. (Q2) How much of the winding (in %) do...

Thyagu... it is (cepsicon [at] aol [dot] com} Phil Corso

Ashutosh... my interpretation of the data thus far: A) During energization of the Delta-winding of the 3-Ph, 5 MVA, 33 kV, 37.5A, transformer, with a single-phase 33kV source, the Siemens Differential Relay, as well as an upstream Energy meter were “observed” to respond to a current flow...

Ashutosh Bhattacharjee... the answer is a simple yes! Regards, Phil Corso

Thyagu... a submersible motor is not equipped with an internal-contact associated with the starting-capacitor found in single-phase motors. Hence the need for externally-mounted relays. You need two relays, a 'Run' relay and a 'Start' relay. They are energized simultaneously without an...

Anonymous... further to my earlier comment(s): Your formula resullts in a torque-vs-speed curve that is a straight line between zero and operating speed. Its slope would be Ts/Ns, where Ts and Ns represent rated torque and speed. Additionally, at speeds above rated, your formula would still...