Výpočet sieťového transformátora

02.05.2012 05:54

Výpočet sieťového transformátora

1. Určíme, alebo stanovíme výkon P2 a príkon P1 transformátora.

Výkon P2 - výkon je súčin napätia a prúdu: U2.I2 + U3.I3 + Un.In (VA).

Účinnosť malých sieťových transformátorov je približne 85 percent.

Príkon P1:

Príklad:

Navrhnite transformátor so sekundárnym vinutím, ktoré má nasledujúce parametre:

U2 = 12V

I2 = 300mA

 

2. Výpočet prierezu jadra Q:

Príklad:

Q jadra vypočítame podľa vzorca :

Príklad:

Q náhodného transformátora:

3. Určíme počet závitov na jeden volt a vynásobíme to napätiami jednotlivých vinutí:

d = konštanta 45

Primár: 230 V. 11,25 = 2587 – 3% (77,6) = 2509,4 závitov

Sekundár: 12 V.11,25 = 135 + 3% (4,05) = 140 závitov

4. Vypočítame primárny prúd I1 a určíme priemer vodičov jednotlivých vinutí:

Ak si zvolíme 3A na milimeter štvorcový, potom pre priemer vodiča platí:

Pre prierez vodiča platí vzťah:

5. Výkon transformátora určuje prierez jadra a množstvo vinutia. Ak máme veľkú plochu jadra potom potrebujeme naviť menej závitov, naopak ak máme malú plochu jadra potrebujeme veľké množstvo závitov na dosiahnutie rovnakého výkonu. Z toho vyplýva, že transformátor má taký výkon koľko závitov sme naňho schopný navinúť.

 

Ing. Michal Imre

 

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