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romicap

Ra transformator de iesire

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           Problema :Sa se calculeze Ra( impedanta primar) transformator de iesire in functie de U primar (exemplu 200V) si U secundar 9V( imped.sec.8 ohmi)... Cel ce da raspunsul corect

primeste un premiu = un litru de vin natural si 100% eco, clasa super.(pe bune!) totul (inclusiv transportul , pe cheltuiala mea)

Edited by romicap

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Un mod rapid de calcul ar fi :

 

Za=NxNxZs+Rp+Rs

Za =impendanza primar in ohm

N= raportul de transformare primar/secundar

Zs=impendanza secunar in ohm

Rp=rezistenta in cc primar

Rs=rezistenta in cc secundar 

.................................................................

Cazul de fata:

N...200/9=22,222

Za=22,22x22,22x8+Rp+Rs=3950 ohm +Rp+Rc 

R primar posibil 120 ohm iar Rsecundar de obicei sub 0,5 ohm 

Deci cca 4070 ohm

daca- mi dai si rezistentele in cc primar si secundar aflam valoarea exacta .

..................................................

Foarte comod si pt un traf necunoscut.

PP sau SE aceasi poveste .

Daca satisface curiozitatea am sa prezint si alte modalitati in special de proiectare  pornind si de la alte situatii.

Accept dor must proaspat (la toamna) cu ridicare personala  :)

Edited by TON

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Intr`adevar PP sau SE nu conteaza si am pus problema in primul rand pentru determinarea impedantei primarului la transformatoare necunoscute .

...Sa mai asteptam si alte pareri...

Edited by romicap

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A pus dl. Lazaroiu mai demult un link, uite ce scrie referitor la trfurile de iesire necunoscute

 

An example.

You connect an unknown output transformer to the 12 volt transformer.
The primary voltage measures 13.0 volts.
The secondary voltage reads 0.453 V.
Assume an 8 ohm load.
Zp = 8 ( 13.0 / 0.453 ) 2 = 6588 ohms.

This is most likely a 6600 ohm transformer. The 12 ohm error is only 0.18%. This was a made up problem. I can say with certainty that measurements on a real transformer won't come out this close.

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A pus dl. Lazaroiu mai demult un link, uite ce scrie referitor la trfurile de iesire necunoscute

 

An example.

You connect an unknown output transformer to the 12 volt transformer.

The primary voltage measures 13.0 volts.

The secondary voltage reads 0.453 V.

Assume an 8 ohm load.

Zp = 8 ( 13.0 / 0.453 ) 2 = 6588 ohms.

This is most likely a 6600 ohm transformer. The 12 ohm error is only 0.18%. This was a made up problem. I can say with certainty that measurements on a real transformer won't come out this close.

Principiul este asemanator cu cel expus de TON , difera doar tensiunile ...

PS . Trebuie tradus ...nu toata lumea ,,spicuieste "...oare de ce nu ma mira ca Dnul Lazaroiu a prezentat acest calcul :26 !?

Edited by romicap

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Salut ! Cred ca ar fi utila initierea unui topic intitulat ; Tutorial  pentru calculul si realizarea transformatoarelor de iesire; 

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