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Baig... if you are only concerned about the motor loss, and not the driven-machine loss, then 20% is way too high. If you are interested in a more realistic value, then please provide the motor's nameplate Hp or kW, its rated voltage, and its rated speed or number of poles! Regards, Phil Corso

Manuel... the response you observed is correct for a resistive load because I = V/R! If a constant kVA load, like a running motor, then the current increases as voltage decreases, and vice-versa. Regards, Phil Corso

Nicolas... Depending on country of manufacture, OUTPUT-shaft power is given in Hp or the equivalent kW! Regards, Phil Corso

Namatimangan08... If you are implying that Abbas' breaker closing was an out-of-phase closure, then you are wrong! The trip occurred 30 sec later! The indication, at least to me, is that synchronizing power had not increased (faulty governor?) thus causing the trip. I believe the delay, if...

Krishna... the simplest procedure is to use the the Y-D impedance transformation. Because formulas tend to upset some of Control.Com readers, contact me for the method. Regards, Phil Corso (cepsicon[at]AOL[dot]com)

MTL announcement a replacement model in the middle of 2010. Contact MTL! Phil Corso

Gitesh... with Generator's CB open, neutral grounding is derived via Generator's NGT installation! Regards, Phil Corso

Tim... your question can't be answered because you left out "stuff!" What about their capacities, impedances, and no-load voltages. Capacity and Impedance influence their "sharing of load" capabilities, while no-load voltage differences affect circulating-current magnitude. X/R ratios have...

Seema... send the SLD directly to me at: (Cepsicon[at]AOL[dot]com) Phil

Seema... further to my earlier post: 7) Can you provide the parameters used on the Generator's NGT System? Regards, Phil Corso

Stele Alex... have you looked into methods used in the design of refrigerant compressors? Regards, Phil Corso

Seema... disregard my earlier question. I misunderstood '525' value. To be clear about your requirement: 1) You want a dis-connectable grounding-source on the 23kV system remaining between the GSU's delta-winding and the CB when the CB is open? 2) Furthermore, please confirm that Unit-Xfmr...

Seema... there is a discrepancy between the transformer Voltage Designation you presented and its Vector-Group notation. Regards, Phil

Moahmed... search the Control.Com Archives for: http://www.control.com/thread/1007573907 Regards, Phil Corso

Gitesh... my answers were based on your statement, "... this winding is not being used anywhere... " But, now you reveal it is used to feed a voltage supervision relay! Why not ask the person(s) who provided you with the info about it being used for balancing? Regards, Phil

Gitesh... FYI, because of the confusion that often arises, open-delta, to me, means the use of just 2 transformers connect in a "vee!" Phil

Gitesh… I contacted a couple of CT manufacturers (GE included) but was unable to get a response. I believe the supplier established three secondary windings as a standard. Thus, the delta-winding open-corner configuration is available for those situations requiring a polarizing source of...

Mick... I suggest you search Control.Com Archives for "flywheel". Regards, Phil Corso

Gitesh... can you provide detail regarding the primary kV, secondary V, and capacity in VA? Phil

Gitesh... strange application! A tertiary-winding is generally used in a 3-phase transformer to overcome thru-fault and zero-sequence problems. With corner-closed, as you observed, then how is the polarizing-voltage source derived for directional ground/earth-fault relays? Are you sure the...