Latest posts from topic “Esercizio su sistema trifase, calcolo delle tensioni.”

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Latest posts from topic “Esercizio su sistema trifase, calcolo delle tensioni.” Latest posts from topic “Esercizio su sistema trifase, calcolo delle tensioni.” on “ElectroYou”. 2015-09-19T10:12:10Z https://www.electroyou.it/forum/viewtopic.php?f=2&t=60272 Re: Esercizio su sistema trifase, calcolo delle tensioni. https://www.electroyou.it/forum/viewtopic.php?f=2&t=60272#p602336 Giuls91 2015-09-19T19:04:58Z 2015-09-19T19:04:58Z

Ah ok! Adesso è tutto più chiaro.
Ti ringrazio tantissimo per la pazienza che hai avuto! :ok:

:ok:

Ho ancora molte lacune :oops:

:oops:

Grazie ancora :-)

:-)

Buona serata O_/

O_/

Re: Esercizio su sistema trifase, calcolo delle tensioni. https://www.electroyou.it/forum/viewtopic.php?f=2&t=60272#p602333 admin 2015-09-19T18:39:38Z 2015-09-19T18:39:38Z

Stellate o concatenate non c'entrano. Occorre solo sapere la definizione di tensione o differenza di potenziale

[unparseable or potentially dangerous latex formula]

Re: Esercizio su sistema trifase, calcolo delle tensioni. https://www.electroyou.it/forum/viewtopic.php?f=2&t=60272#p602332 Giuls91 2015-09-19T18:22:04Z 2015-09-19T18:22:04Z

Ok, sbagliavo i segni nel calcolare la tensione ${\dot{V_{ac}}}$ .
Adesso il risultato è giusto. Però non ho capito perchè mentre in tutte le altre faccio la somma delle singole tensioni, in questa si fa la differenza.
Forse perchè non ho a che fare con le tensioni concatenate ma con la tensione stellata ${\dot{E_1}}$ ?
Non ho capito :cry:

:cry:

Re: Esercizio su sistema trifase, calcolo delle tensioni. https://www.electroyou.it/forum/viewtopic.php?f=2&t=60272#p602331 admin 2015-09-19T18:15:12Z 2015-09-19T18:15:12Z

Per vedere cosa sbagli occorrerebbe vedere che calcoli fai.

[unparseable or potentially dangerous latex formula]

Re: Esercizio su sistema trifase, calcolo delle tensioni. https://www.electroyou.it/forum/viewtopic.php?f=2&t=60272#p602318 Giuls91 2015-09-19T17:09:30Z 2015-09-19T17:09:30Z

[quote="admin"]Inoltre è sbagliato il calcolo dell'impedenza equivalente, che non può avere una parte reale negativa

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Che sbadata, mi sono confusa con i segni. Ho rifatto i calcoli e adesso l'impedenza equivalente diventa come l'hai calcolata tu. Un passaggio inutile però dato che alla fine non mi serve ai fini del calcolo delle singole tensioni. Grazie per la correzione :ok:

:ok:

[quote="admin"]e pure errata è la terna delle stellate. Se t.s.d. significa terna di sequenza diretta, E2 ed E3 vanno scambiate

$\begin{array}{l} {{\dot E}_1} = 200\angle 30 = 100 \times \sqrt 3 + {\rm{j100}}\\ {{\dot E}_2} = 200\angle - 90 = - {\rm{j200}}\\ {{\dot E}_3} = 200\angle 150 = - 100 \times \sqrt 3 + {\rm{j100}} \end{array}$

Giusto, ho sfasato le tensioni stellate in senso orario anzichè in senso antiorario, quindi ho scambiato la 2 e la 3.

[quote="admin"]
Impressione corretta in quanto
$\begin{array}{l} {{\dot V}_{1c}} = {{\dot E}_1}\\ {{\dot V}_{3c}} = {{\dot E}_3} \end{array}$
(stella equilibrata, quindi centro stella di carico e generatori equipotenziali)

Quindi per calcolare le ultime due tensioni non ho bisogno di avere le tensioni concatenate? Mi baso su quelle stellate?
Io ho la soluzione dell'esercizio, ma solo due tensioni risultano uguali.
[unparseable or potentially dangerous latex formula]
[unparseable or potentially dangerous latex formula]
[unparseable or potentially dangerous latex formula]
è il risultato che ottengo io, mentre invece, da testo dovrebbe essere
[unparseable or potentially dangerous latex formula].
Cos'altro ancora sbaglio? :cry:

:cry:

Re: Esercizio su sistema trifase, calcolo delle tensioni. https://www.electroyou.it/forum/viewtopic.php?f=2&t=60272#p602309 admin 2015-09-19T16:21:57Z 2015-09-19T16:21:57Z

[quote="Giuls91"]ho la sensazione di avere sbagliato a calcolare le ultime tensioni

Impressione corretta in quanto
$\begin{array}{l} {{\dot V}_{1c}} = {{\dot E}_1}\\ {{\dot V}_{3c}} = {{\dot E}_3} \end{array}$
(stella equilibrata, quindi centro stella di carico e generatori equipotenziali)

Inoltre è sbagliato il calcolo dell'impedenza equivalente, che non può avere una parte reale negativa

[unparseable or potentially dangerous latex formula]

e pure errata è la terna delle stellate. Se t.s.d. significa terna di sequenza diretta, E2 ed E3 vanno scambiate

$\begin{array}{l} {{\dot E}_1} = 200\angle 30 = 100 \times \sqrt 3 + {\rm{j100}}\\ {{\dot E}_2} = 200\angle - 90 = - {\rm{j200}}\\ {{\dot E}_3} = 200\angle 150 = - 100 \times \sqrt 3 + {\rm{j100}} \end{array}$

Esercizio su sistema trifase, calcolo delle tensioni. https://www.electroyou.it/forum/viewtopic.php?f=2&t=60272#p602256 Giuls91 2015-09-19T10:12:10Z 2015-09-19T10:12:10Z

Salve a tutti.
Ho cercato di risolvere questo sistema trifase:

Sorgente FidoCadJ | Ingrandisci | Cos'è Fidocad

La mia idea è di calcolare le singole tensioni tra i nodi noti 1a, a2, 2b, b3, 1c, 3c per poi farne la somma e trovare le tensioni tra ab, bc, ac.
Prima di tutto, calcolo l'impedenza equivalente:

[unparseable or potentially dangerous latex formula]

e le singole tensioni stellate (espresse in funzione della fase) che risultano essere:

$E_{1}=100\sqrt{3}+j100$
$E_{2}=-100\sqrt{3}+j100$
$E_{3}=-j200$

da cui ricavo le tensioni concatenate:

$V_{12}=E_{1}-E_{2}=200\sqrt{3}$
$V_{23}=E_{2}-E_{3}=-100\sqrt{3}+j300$
$V_{31}=E_{3}-E_{1}=-100\sqrt{3}-j300$ .

A questo punto, la rete da studiare sarà:

Sorgente FidoCadJ | Ingrandisci | Cos'è Fidocad

Per il calcolo delle tensioni, utilizzo un partitore di tension, ma ho la sensazione di avere sbagliato a calcolare le ultime tensioni. Quindi:

$V_{1a}=\frac {R_{1}}{R_{1}+R_{2}}V_{12}=100\sqrt{3}$
$V_{a2}=\frac {R_{2}}{R_{1}+R_{2}}V_{12}=100\sqrt{3}$
$V_{2b}=\frac {R_{3}}{R_{3}+R_{4}}V_{23}=-25\sqrt{3}+j75$
$V_{b3}=\frac {R_{4}}{R_{3}+R_{4}}V_{23}=-75\sqrt{3}+j225$
$V_{1c}=\frac {X}{X+X}V_{31}=-50\sqrt{3}-j150$
$V_{3c}=\frac {X}{X+X}V_{31}=-50\sqrt{3}-j150$

Per cui:

[unparseable or potentially dangerous latex formula]
[unparseable or potentially dangerous latex formula]
[unparseable or potentially dangerous latex formula]

Ovviamente, tutte le tensioni sono intese come fasori, non sapevo come indicarli in latex.
Sbaglio qualcosa? E cosa sbaglio? :oops:

:oops:

Grazie a tutti quelli che mi risponderanno :ok:

:ok:

Buona giornata O_/

O_/