Search results

Saad... see: http://www.control.com/thread/1295539117 Regards, Phil Corso

Gautam... Q1: The ground-terminal protects endangerment of human life if there is a primary-insulation failure resulting in energization of the secondary winding at primary-voltage level. Q2: "...I observe a different behavior..." This is indicative of either a faulty CT, or a an external...

FF... Please play particular attention to Candl_Pete's excellent post. He was able to illustrate my thesis with an example that proves MVAr influences losses. Regards Phil

FF, further to my earlier post, see the following Control.Com thread: http://www.control.com/thread/1334941880

FF, problem is clearer. Following is a summary, based on information provided to date: A) Gen1's output is 19.8 MW & 12 MVAr, or about 23.2 MVA (77.4% of rating). B) Gen2's output is 15.5 MW & 12 MVAr, or about 19.6 MVA (65.3% of rating). C) Total load is 35.4 MW & 24 MVAr (without...

Amrit... Would you mind sending me a copy of your calcs? Phil

Amrit... OK! Then to summarize, neither phase or ground-fault differential protection can reliably detect open-phase conditions outside of the diff'l zone. The rather simple method I would have proposed is Phase comparison. Phil Corso

FluidFlow... Do you want me to answer you directly, via control.com, or both? Phil

FluidFlow... can you send me a simple Single-Line-Diagram (or hand-drawn sketch) that relates how the Generator, Line, Cap-bank, and Local load are interconnected? Phil ([email protected])

Amit... the proposed NRC "fix" for the 'Open-Phase' phenomenon appears to consider such faults while systems are "loaded." Would you be interested in Open-Phase detection during initial energization of assets before they carry load? Phil

Amrit... First some general comments related to your open-phase concern: A) During normal operation of the transformer, Phase-fault Differential-relays will only trip if the open-phase condition results in a substantial current-unbalance within the differential zone, i.e., primary to...

Amrit... one last question; what is size of the xfmr? Regards, Phil

Fluidflow... I apologize for having missed your post! What did you mean by "LINE LOAD" in your senior officer's position that "CAPACITOR BANK is maintaining the LINE LOAD rather than GENERATED LOAD"? Regards, Phil Corso

Saudaslam... the situation you described is not that of a local generator connected to an 'infinite' grid. Expectation of a reasonable solution to your problem requires additional information. For example, pre-disturbance parameters such as Gen Capacity, details on connection to grid, Step-up...

Amrit, please confirm the following conditions: 1) Grid-side winding (345kV) is wye-connected, and mid-pt is solidly grounded 2) Gen-side winding (13.8kV) is resistance or otherwise impedance-grounded 3) Teritiary winding (?kV) is delta-connected, but: 3a) its terminals are outside the...

Charz, Is the mid-point of the star-conected capacitors grounded/earthed? Regards, Phil Corso

Is there the possibility that despite the use of VFDs, the motors are locking up at full voltage? Regards, Phil Corso

The original definition was "Distributed Control System! Phil

Roy, Wasn't something like this involved in the 3-Mile Island catastrophe? Phil.

Martin Crummy, I suggest you detemine what voltages sources are connected to the auto-sychronizer for each of the conditions you cited! Regards, Phil Corso