Phasors - what are they and why are they so important in power system analysis?
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- Опубліковано 3 сер 2024
- What are phasors and why are they they the default system for expressing voltage and current in power system analysis?
Phasor notation was proposed in 1893 by Charles Proteus Steinmetz, and were rapidly adopted in AC circuit theory. Phasors hugely simplify the analysis of power systems, in particular through the use of the impedance triangle and Ohms law. In this video, we will use a visual approach to try to understand why Phasors are so useful.
0:00-1:32 Introduction
1:32-4:41 What is a phasor?
4:41-8:27 Example of the use of phasors using complex Ohms law - Наука та технологія
Extraordinary, I have no words to express the greatness of this video.
until now, probably best video I've seen on phasors
Amazing video! Please do more on power systems like fault currents to relay, 3 phase lines, cap banks, switchgears and such.
+1
I'm amazed by watching this video. I spent 4 years as an EEE major but always wonder what these complex numbers and phasor quantities mean. without deeply understanding the visual meaning I kept doing maths. even the teacher didn't explain this much visually. I am glad that I found this channel. this video's contents are so dame information but I don't know why there is not much view. sir keep making videos. All the best
The approach of Charles Proteus Steinmetz for the solution of circuits using complex numbers, although very similar, it is not what we know today as Phasor Analysis. After carefully studying his paper, Steinmetz's approach is more closely related, in my opinion, to "harmonic addition". If I recall correctly, one problem with Steinmetz method is that the resulting reactance of a capacitor is positive and the reactance of an inductor is negative; which is the opposite of what we get while using phasors! The concept of phasor as we now it today was introduced much later, like the 1940s or so. Before that, calculations in electric circuits were done using "vectors" or "complex numbers". The phasor is also a complex number representation of the amplitude and phase of a sinusoid. The difference is that while in harmonic addition both the real and imaginary parts of the complex number solution are needed to reconstruct the solution in the time domain (as shown in Steinmetz paper), in phasor analysis only the real part of the complex solution is needed to reconstruct the solution in the time domain.
Amen
. . . this is, hands down, the best video on the UA-cam on a subject of use of complex numbers for describing AC current. I subscribed to your channel after whole 3 seconds of deliberating ;-)
Thanks!
Okay, this did it for me.
Thank you so much!
Best video I have seen on the net!
Such a great explanation, thank you!
absolutely awesome video
Fantastic video. Well done!
Thank you so much for this video!
solid video!
As far as RLC vector theory, this video is just what I was looking for. In the real world of AC it would be impossible to get an absolutely perfect 90 degree phase shift between voltage and current in a single phase circuit. That's only possible in theory.
Resonance.
"Under sinusoidal steady Real Ordinary Differential Equation set become Complex algebraic equation set" this is phasor representation. So we can analyse AC circuits like DC circuits but with complex numbers
magnetism and electrical are very beautiful
Superb
Thank you for a great video, I am also baffled by your statement "The Impedance is not a Vector." I am not sure I understand your statement. In fact, Impedance has an active component (R) and a Reactive component X(L) or X(C). This is not far-fetched from a vector (in R2) that has both a X component and a Y component. Would you kindly comment on why there is so many similarities and yet these two (2) items (impedance and vector) are yet different? Aside from this, I must say your video is exceptionally good.
Thank you for your time and consideration.
what software for this animation?
"..extra complexity..."! Did I just hear a pun escaping notice?
Your phase plot and phasor diagram are inconsistent. The frozen in time blue horizontal phasor should represent a cosine behavior in phase plot.
I'm àssuming 0 degree phase is left vertical side of window in phase plot
Hi Jim, just so I'm clear what timestamp are you referring to?
@@VisualElectric_ there should by phase degree markings in radians (π/2, π etc) along the horizontal axis of the phase plot. The blue sinusoidal (blue phasor @ 0 degrees) should be a V*cosine function. At 0 degrees on phase plot the blue curve = amplitude V. You show the correct relative phase but there's nothing to show the global phase on the phase plot. I just assumed the left edge of phase plot was phase angle = 0. But if that's the case the blue curve should be cosine as that's the real part of the complex number phasor
Or in other words a horizontal phasor (in this case applied voltage drop represented as a phasor having 0 degrees phase angle or parallel with the real axis in the complex plane) is used to represent a sinusoidal behavior consistent with a cosine function in the phase plot.
The angle on your phase plot is implied but not explicitly shown.
Also time in analysis of steady state ac circuit is irrelevant. Only phase and amplitude of the voltage drops and currents are relevant.
Oh the time stamp where a phase plot is first encountered is ~ 2:05
@@jimhenderson2308 skill issue