Search results

Sekar, I've never heard of ay penalty based on an instantaneous value. They are usually based on an integrated interval... eg, 15 minutes. Thus, while staggered starting sequence will ameliorate voltage-drop due to a "weak" power supply, it will not have an impact on pf penalty. Now...

There is no technical distinction between a blower and a fan! Regards, Phil Corso, PE Boca Raton, FL [[email protected]] ([email protected]) {[email protected]}

Consider a Totally-Enclosed-Fan-Cooled motor! Regards, Phil Corso, PE Boca Raton, FL [[email protected]] ([email protected]) {[email protected]}

Danny, Prior to energizing motor controller, how was direction of rotation checked? Regards, Phil Corso, PE Boca Raton, FL [[email protected]] ([email protected]) {[email protected]}

Even peak demand is based on time duration., i.e., kWhr / time. Furthermore, demand is related to real power, and peak current, which results in peak kVA, or apparent power. Regards, Phil Corso, PE Boca Raton, FL [[email protected]] ([email protected]) {[email protected]}

Dao Ba Phong. I found the paper. My recollection of the date was wrong: "Protection of Induction Motors Against Unbalanced Voltages" IEEE Transactions on Industry Applications. Vol. IA-21, No. 4, May/June, 1985. Authors: Paul R. Cummings, John R. Dunki-Jacobs, Robert H. Kerr...

Dao Ba Phong. I found the paper. My recollection of the date was wrong: "Protection of Induction Motors Against Unbalanced Voltages" IEEE Transactions on Industry Applications. Vol. IA-21, No. 4, May/June, 1985. Authors: Paul R. Cummings, John R. Dunki-Jacobs, Robert H. Kerr...

Search List archive for origin of the term "Free Wheeling" Regards, Phil Corso, PE Boca Raton, FL [[email protected]] ([email protected]) {[email protected]}

Here is one. It is my thesis... The fallacy of TMR! It is covered in my paper: Probabilistic Risk Asssessment (PRA) of Equipment Safety Systems Publication... Journal Of the System Safety Society periodical "Hazard Prevention" Vol 35, No.3, 3rd Qtr, 1999. Produced by ASWaterman, Inc...

Responding to Anand Rao's query: While I appreciate your kind thoughts about my experience, I want to make it clear that my mechanical vibration expertise is limited. I usually get involved when all mechanical vibration causes are exhausted. Vibration due to mechanical failures are...

Responding to Fred's comments: 1) Power Factor Improvement is the more correct term. 2) PF capacitors will have virtually no effect on PF improvement during start. Typically they are sized to offset a little less than the no-load reactive power of a motor. More than that could expose the...

Ba Phong: The parameters you are seeking are not available from the data you show. However, they can be obtained from two factory tests: the open-circuit or noload test, and the blocked-rotor or short-circuit test. Alternatively, you can ask motor vendors to furnish per-unit data which...

Is this similar to a three-phase electrical annealing pocess that is controlled via SCRs or Triacs? Regards, Phil Corso, PE Boca Raton, FL [[email protected]] ([email protected]) {[email protected]}

If this is a 2 out of 3, or even a three out of 3, situation why aren't you using the setpoint establshed by the average signal? Regards, Phil Corso, PE Boca Raton, FL [[email protected]] ([email protected]) {[email protected]}

The sub probably has a staion-battery. Why not use an UPS or change fan motors to DC? Regards, Phil Corso, PE Boca Raton, FL [[email protected]] ([email protected]) {[email protected]}

Attn: Anonymous! Please furnish supply, motor, and load parameters! Regards, Phil Corso, PE Boca Raton, FL [[email protected]] ([email protected]) {[email protected]}

I always wondered why "Human Machine Interface?" It implies that perhaps there could be an CMI for a chimp, or FMI for a fish. Remember they are panel operators, too! Regards, Phil Corso, PE Boca Raton, FL [[email protected]] ([email protected]) {[email protected]}

A key factor in Water Level and Boiler Feed Water control is the size of the steam and mud drums. If too small they can thwart attempts to effectively control drum level. Years ago I participated in a study conducted to mathematically relate drum size to drum level transients caused by sudden...

My only recollection was that they were in the 1 MW range and about 3kV. More importantly, they were not 2-pole machines. There is a simple reason why the "standard" design motor probably shouldn't be used in reversing service.... starting duty. If you start it, wait for it to coast to a...

Of course, but frequency of reversal and moment of inertia of all rotating elements must be carefully evaluated! The application I am most familiar with is crane and hoist duty. Regards, Phil Corso, PE Boca Raton, FL [[email protected]] ([email protected]) {[email protected]}