Zbirka rešenih nalog - LES - Univerza v Ljubljani
Zbirka rešenih nalog - LES - Univerza v Ljubljani
Zbirka rešenih nalog - LES - Univerza v Ljubljani
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Nadomestno vezje in kazalčni diagram transformatorja<br />
R k X k<br />
U 2 '<br />
U 1<br />
I 1<br />
X b<br />
Z<br />
U<br />
230<br />
1n<br />
cel<br />
= = = 10.58 Ω , (6)<br />
I1n<br />
21.739<br />
Celotno reaktanco sestavljata stresana reaktanca Xk in reaktanca bremena Xb:<br />
2 2 2 2<br />
X<br />
cel<br />
= Zcel − Rk = 10.58 − 0.6348 = 10.561 Ω , (7)<br />
X<br />
cel<br />
= Xk + X<br />
b<br />
→ X<br />
b<br />
= X<br />
cel<br />
− X<br />
k<br />
= 10.561 − 0.5598 = 10.00 Ω . (8)<br />
Reducirana sekundarna napetost pri nazivni obremenitvi z induktivnim bremenom je<br />
tako:<br />
U = X ⋅ I = ⋅ = , (9)<br />
'<br />
2 b n<br />
10.00 21.739 217.39 V<br />
oziroma absolutna nereducirana vrednost:<br />
U 217.39<br />
U = ⋅ = ⋅ 42 = 39.7 V . (10)<br />
230<br />
'<br />
2<br />
2<br />
U2n<br />
U1n<br />
Generatorji in transformatorji - zbirka rešenih <strong>nalog</strong> 24