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Výpočet sieťového transformátora
02.05.2012 05:54Výpočet 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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