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Saran... look for Thread # 976478849 in the Control.com Archives. Phil Corso

Shift Charge Engineer... what is MVAr (if any) corresponding to 90 MW Load? Phil Corso

Look at process sequence to see if test can be inserted in-line. Following is an example: Problem: Check calibration of Film-Thickness gauge on a cellophane-web machine. Solution: Extended lateral travel of sensing-head to include fixed thickness samples, mounted on each side of web...

Server... perhaps load carried by conveyor is very small compared to the conveyor itself! Please provide details, that is: conveyor material (rubber, canvas, steel, etc); type of idler pulleys (with or w/o bearings); width; length; conveyor elevation above (or below) horizontal; weight per...

Bala... so metering CT had three (3) five Ampere-rated secondaries! Blown HV fuse is indicative of insulation breakdown between primary and secondary earthed terminal! What was manufacturer’s conclusion after analysis! Regards, Phil Corso

Salar... Ignoring losses of the VFD itself, motor losses will increase, although not significantly. The reason is that the VFD introduces electrical phenomena not present when the motor is powered from a sinusoidal power source. The curves in the DOE report you listed are the result of...

Sa... as a start see Control.com Thread # 949513894 ! Phil Corso

M. Rangacharya... have you compiled a parameters matrix listing steam-related flow, temperature, and pressure, bearing temperature & vibration, attached piping displacement, etc, of all pertinent variables? Regards, Phil Corso

Aghvel... It has to do with the characteristic torque-speed curve of the motor, especially the region between breakdown-torque and the rated output-torque. A) RPM Increase As voltage increases "slip" decreases. Remember "slip"” is the difference between rated-synchronous speed (supply...

Munir... certainly, just contact me off-list. Phil Corso (cepsicon [at] aol [dot] com)

Anthony... overlooking the fact your question was raised many, many years ago, are you still interested in a simple logic-circuit to implement the correct shutdown sequence regardless of the operator's contrary procedure? Regards, Phil Corso (cepsicon [at] aol [dot] com)

Curt... because the motor is not running during the test, the measured impedance should be that associated with locked-rotor, starting inrush, or break-away current. That is, some 4-8 times nominal depending on its kVA/Hp constant. Hamad... I'm not sure about what you want to calculate. All...

Hamad... I recommended you slowly turn the rotor one revolution, making measurements in small increments. Four measurements per phase is inadequate to detect a phase unbalance, unless severe. BTW, inductive reactance is calculated as 2 x Pi x F x L, or about 314 x L Ohms, if F = 50 Hz...

Mechanical... in English units, the calculation involves heat-rate, i.e., lbs of steam per lb of fuel and feed-water temperature! Regards, Phil Corso

Sukhi Sagoo... What is distance between motor location and control room? Regards, Phil

Amrithraj... I suggest you do a web-search for Motor Selection Guides.

Jeremy... Did you solve the problem? Regards, Phil

Jimper... while dielectric-loss (insulation, oil) is measurable, it will not materially affect the outcome of the Hussain's question! However, if I have misunderstood the point of your comment, please elaborate! Regrads, Phil Corso

Shoaib, you are correct if: the primary-winding and secondary-winding leakage impedances are equivalent; and 2) you are using an "approximate" version of the transformer model, that is, core-loss components are placed at the supply-source voltage terminals. An aside to Hussain... are you sure...

Sam... if you are going to delve into static pressure formulas, you may also want to investigate dynamic behavior, that is, Hydraulic-Pulse-Pressure phenomena. I have a Nomagraph that determines the hoop-stress pulse pressure when oil or air thru tubing is suddenly shut-off! Developed by...