mbrooke
Batteries Included
- Location
- United States
- Occupation
- Technician
Short Circuit Analysis - X/R ratio given in symmetrical components
- Thread starter joshtrevino
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Phil Corso
Senior Member
- Location
- Boca Raton, Fl, USA
MBrooke,
Prof, Backburn was my teacher and mentor!
Phil
Prof, Backburn was my teacher and mentor!
Phil
mbrooke
Batteries Included
- Location
- United States
- Occupation
- Technician
iceworm
Curmudgeon still using printed IEEE Color Books
- Location
- North of the 65 parallel
- Occupation
- EE (Field - as little design as possible)
Wow, I'm impressed. You must have worked for Westinghouse in the 60s - 70s?
I met him at a seminar in Everett, Wa - mid 70s, maybe 1975. I'd guess he was 60+ at the time.
I was still using a third edition Applied Relaying until about 5 years ago when someone decided they needed it more. (snarl - whine)
ice
Phil Corso
Senior Member
- Location
- Boca Raton, Fl, USA
Iceworm,
Reur question... No! I was working for Celanese Plastics, at the time! I was also pursuing a MSEE (Power Opt) at Newark College of Engineering! He was Course Instructor, and the grandaddy of Protective Relaying, "Silent Sentinals @ $3.00" was the text!
Phil
Reur question... No! I was working for Celanese Plastics, at the time! I was also pursuing a MSEE (Power Opt) at Newark College of Engineering! He was Course Instructor, and the grandaddy of Protective Relaying, "Silent Sentinals @ $3.00" was the text!
Phil
mbrooke
Batteries Included
- Location
- United States
- Occupation
- Technician
iceworm
Curmudgeon still using printed IEEE Color Books
- Location
- North of the 65 parallel
- Occupation
- EE (Field - as little design as possible)
Do happen to have a pdf version of that? (Blackburn) I lost mine years ago/
No. I'll be buying another paper copy - $90 - $100 I suspect. Hopefully I don't wait until the day I need it - although that is my norm.
ice
Phil Corso
Senior Member
- Location
- Boca Raton, Fl, USA
Ice; MBrooke!
I can't help wth a PDF file of "Applied Protedtive Relaying", but here's one for "Silent Sentinals":
http://babel.hathitrust.org/cgi/pt?id=wu.89089711683;view=1up;seq=13
Phil
I can't help wth a PDF file of "Applied Protedtive Relaying", but here's one for "Silent Sentinals":
http://babel.hathitrust.org/cgi/pt?id=wu.89089711683;view=1up;seq=13
Phil
Bugman1400
Senior Member
- Location
- Charlotte, NC
Uhh....are we still talking about sym comp? And, I assume you guys are referring to Lewis Blackburn.
For me, the power industry application of A+jB (sometimes written as A+Bj or A+iB or A+Bi) makes more sense as R+jX. The R is the resistance of the wire and the X is the reactance of the wire. The impedance (Z) is typically written as Z=R+jX and refers to something that has both a resistive (R) and reactive (X) component.
For me, the power industry application of A+jB (sometimes written as A+Bj or A+iB or A+Bi) makes more sense as R+jX. The R is the resistance of the wire and the X is the reactance of the wire. The impedance (Z) is typically written as Z=R+jX and refers to something that has both a resistive (R) and reactive (X) component.
Phil Corso
Senior Member
- Location
- Boca Raton, Fl, USA
Bugman,
Yes! And Yes!
BTW, the operator "i" is used my math guys and gals, while the operator "j" is used by EE's!
Yes! And Yes!
BTW, the operator "i" is used my math guys and gals, while the operator "j" is used by EE's!
Phil Corso
Senior Member
- Location
- Boca Raton, Fl, USA
Gentlepeople,
Anyone interested in the how a supply voltage imbalance affects an operating motor's temperature. Specifically, how that temp-rise can be determined using Symmetrical Components?
Phil Corso
Anyone interested in the how a supply voltage imbalance affects an operating motor's temperature. Specifically, how that temp-rise can be determined using Symmetrical Components?
Phil Corso
rcwilson
Senior Member
- Location
- Redmond, WA
Symmetrical Components Example
Symmetrical Components Example
For a great visual example of Symmetrical components, search for Alex McAherns Power Quality Teaching Toy (https://www.powerstandards.com/PQTeachingToyIndex.php) and download the simulation.
It shows how the positive, negative and zero sequence vectors add to form the unbalanced vectors.
(BTW, Phil, my copy of Blackburn's "Symmetrical Components" is autographed by "J Lewis Blackburn - Oct 1993". That autograph helped me once or twice in relaying discussions with utility engineers).
Symmetrical Components Example
For a great visual example of Symmetrical components, search for Alex McAherns Power Quality Teaching Toy (https://www.powerstandards.com/PQTeachingToyIndex.php) and download the simulation.
It shows how the positive, negative and zero sequence vectors add to form the unbalanced vectors.
(BTW, Phil, my copy of Blackburn's "Symmetrical Components" is autographed by "J Lewis Blackburn - Oct 1993". That autograph helped me once or twice in relaying discussions with utility engineers).
I would. I have a motor that keeps overheating yet never runs above nameplate.
Phil Corso
Senior Member
- Location
- Boca Raton, Fl, USA
Vicdog,
If you provide the motor's three phase-to-phase voltages, and the three line-currents, I can demonstrate the process for determining the degree of imbalance! Also include nameplate data, and if known, its operating Power-Factor!
Regards, Phil Corso
If you provide the motor's three phase-to-phase voltages, and the three line-currents, I can demonstrate the process for determining the degree of imbalance! Also include nameplate data, and if known, its operating Power-Factor!
Regards, Phil Corso
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