/sci/ - Science & Math

>>11479377
Frogposting is your first clue here zoomer.
Grow up and deal with it.
Also stop posting frogs, in fact, delete them from your general computing device.

imagine not being actually able to self treat a broken bone like humans have done for millennia and still do now
you deserve to get eaten by a bear by being such a weakling

I posted this on /sqt/ but got no answers and can't find an answer anywhere else so in making a thread.

Where doing asymetric fault analysis and there's something that doesn't add up.

By definition, the impedance matrix of a system is the inverse of its admittance matrix, this is:
[eqn]Z_{bus} = Y_{bus}^{-1}[/eqn]

Because of this fact, whenever we've had to use the impedance matrix, for example to get the thevenin impedance a bar "sees", we simply construct [math]Y_{bus}[/math] and then invert it.

The problem is, now that we're doing asymmetric faults, You need to know the thevenin impedance each bar sees in every sequence in order to compute the fault voltages and currents for each bar. basically we need [math]Z_{bus}^{(0)},Z_{bus}^{(1)}[/math] and [math]Z_{bus}^{(2)}[/math]

Now, the book were using (Stevenson, Grainger) uses an algorithm to build the [math]Z_{bus}[/math] of a system directly from its diagram and this works just fine, but if you construct [math]Y_{bus}[/math] for lets say the zero sequence network and then invert it, you get a [math]completely[/math] different matrix from the [math]Z_{bus}[/math] that was built directly using the algortihm.

This is a major issue because we don't know how to use that algorithm (prof didn't teach it) and we have no time to learn it.

Tl;dr why does constructing [math]Y_{bus}[/math] and inverting it does not yield [math]Z_{bus}[/math] when dealing with sequence networks?

(Is coffee good for you?)

>>11282182
I know this is pasta but something similar once happened to me back when I was in hs.

>Hs is catholic, ran by opus dei
>Religion class
>Religious extremist prof talking about how evidence for evolution is "incongruent and inconclusive"
>Has the nerve to say, and I quote; "The creationist model has been shown to far better explain the complexity in living organisms"
>Followed by the "its just a theory" retardation
>Mfw this dude was trying to sound scientific whilst refuting evolution
>Told him evolution has been directly observed in populations of lizards confined to an island throughout a period of over 30 years
>Told him theres overwhelming genetic evidence for evolution
>Told him he doesnt understand what the word theory means
>Told him he doesnt even know what evolution is and asked him to define it
>Dude just went batshit and started screaming at me
>Kicks me out from class
>Tell him his class is a waste of time anyway and that god is just wishful thinking for retards
>"Ill make sure you're expelled"
>Went to the principal's office (principal was my homie)
>"[Religion prof] is a moron, dont listen to that lunatic"
>Principal even bump fisted me for my actions, kek

Pretty fun story, religious extremists are fucking insane.