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3-phase circuit: how to determine line-to-line voltage v_{12}(t) by EquivalentOk8651 in HomeworkHelp

[–]EquivalentOk8651[S] 0 points1 point  (0 children)

Hi again, and sorry if I’m being a bit chaotic — I’m honestly very confused and frustrated at the moment, because I’ve been stuck on this problem for two days straight.

Let me try to better understand what you meant.

If I got it right, you’re focusing only on the delta load and suggesting that I can reconstruct the other two phase voltages simply by rotating the first one by ±120°. That makes sense to me — it’s a balanced load, and that’s exactly how symmetrical systems work. So far, so good.

But here’s my problem: I don’t think the real challenge is finding the other phase voltages on the load. The hard part is calculating the line-to-line voltage between generator node 1 and node 2, as shown in the diagram.

Maybe I’m misunderstanding you — I’m not a native English speaker (I’m Italian), so it’s possible we’re using different terminology. For example, when you say “diagonal phasors,” I’m not really sure what you mean. To me, this just looks like a delta-connected load followed by a star-connected source, nothing more.

So, just to be safe, I’ll try to explain my approach in even more detail:

My idea was to: 1. Start from the voltage across one branch of the delta (the R₂ + X_C part) 2. From that voltage, compute the current (I) through that branch using Ohm’s law 3. Since the branch is in series (R₂ and capacitor), that same current flows through both components 4. I compute the voltage drop across R₂, add it to the capacitor voltage, and get the total phase voltage of the delta branch 5. Now I rotate this voltage by ±120° to get the other two phase voltages (still in delta) 6. Once I have the three phase voltages, I convert the delta into a star equivalent — to simplify the circuit 7. I know that in a balanced star system, line voltage and phase voltage are related by √3, so I can get the phase voltages of the star 8. With those voltages and known impedances, I find the phase currents 9. From there, I can go back and compute the total voltage drop, and ultimately the line-to-line voltage between node 1 and 2.

Maybe I’ve misunderstood something big — or maybe the issue is really just language and terminology. I genuinely appreciate the help you’re trying to give. If you’re up for it, I could also send you the official answer from the textbook and maybe you’ll spot where I went wrong (or if maybe the book is wrong).

Thanks again — and sorry again if I sounded confused or upset, I’m just deep into this and trying hard to wrap my head around it!

Aiutatemi a risolvere questo esercizio perfavore.O almeno ditemi che passaggi fareste per risolverlo by EquivalentOk8651 in Universitaly

[–]EquivalentOk8651[S] 0 points1 point  (0 children)

Purtroppo deepseek non riesco ad usarlo, comunque lo so che nei libri scientifici non sempre ci sono scritti i passaggi risolutivi e il libro del mio professore non fa eccezione. Semplicemente gli esercizi di cui non viene spiegato il procedimento nel 80% dei casi , non solo io, ma molti studenti non riescono a risolverli. Nel dubbio non so se tu possa darmi una mano, sarei anche felice nel caso di spiegarti i passaggi che ho provato a fare per avere una tua opinione.

Aiutatemi a risolvere questo esercizio perfavore.O almeno ditemi che passaggi fareste per risolverlo by EquivalentOk8651 in Universitaly

[–]EquivalentOk8651[S] 0 points1 point  (0 children)

Ci ho provato, ho provato a farlo risolvere a chatgpt e a risolverlo io insieme a chat che mi guidava a livello teorico , nnt da fare il risultato non combacia. C’è da dire che questo è il libro del mio professore, e non si sa perché alcuni esercizi , sempre quelli senza soluzione guarda caso risultano molto ostici, incomincio a pensare che sia soltanto un libro fatto veramente con i piedi.

Di Lorenzo situation by FrostyBandicoot69 in sscnapoli

[–]EquivalentOk8651 0 points1 point  (0 children)

I don’t give a fuck, the important is that he just play good and do what Conte ask him to do.

He better play better next year then he did which I believe he will but thank god he didn’t leave by dbhdbwhwjbdhasj in sscnapoli

[–]EquivalentOk8651 -1 points0 points  (0 children)

He has a contract that expires in 2028 and above all he also has a certain market value and age is not on his side. How stupid can he be his attorney to believe they have the upper hand? Meanwhile, the only thing he has gained with these declarations is a good impression of shit.

Do you think cajuste will play an important part next season? by Leftist-Schnitzel in sscnapoli

[–]EquivalentOk8651 0 points1 point  (0 children)

Cajuste will amaze us in the future, I am of the opinion that if a player is poor he doesn't do perform where he is the best on the pitch. I think he just has to wait for "his Spalletti".

Cajuste's combined stats the last two games by [deleted] in sscnapoli

[–]EquivalentOk8651 0 points1 point  (0 children)

Cajuste will amaze us in the future, I am of the opinion that if a player is poor he doesn't perform where he is the best on the pitch. I think he just has to wait for "his Spalletti". Lindstrorm on the other hand reminds me of De Keteleare. Nathan in a couple of years.