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150 / 2<br />
I C rms =<br />
6,37<br />
1 =<br />
16,7<br />
(b) Reaktansi untuk harmonisa ke-3 dan ke-5 berturut-turut<br />
adalah<br />
X C1<br />
X<br />
X C3<br />
= = 2,12 Ω ; C1<br />
X C5<br />
= = 1,27 Ω<br />
3<br />
5<br />
Arus efektif harmonisa<br />
A<br />
30 / 2<br />
I C3 rms = = 10<br />
2,12<br />
I C<br />
5 / 2<br />
=<br />
1,27<br />
5 rms =<br />
2,8<br />
A<br />
A<br />
THD<br />
I<br />
I<br />
=<br />
I<br />
hrms<br />
C1rms<br />
=<br />
10<br />
2<br />
+ 2,8<br />
16,7<br />
2<br />
= 0,62<br />
atau<br />
62%<br />
(c)<br />
THD<br />
V<br />
V<br />
=<br />
V<br />
hrms<br />
1rms<br />
=<br />
2<br />
2<br />
30 5<br />
+<br />
2 2<br />
150 / 2<br />
21,5<br />
= = 0,20 atau<br />
106<br />
20 %<br />
(d) Losses dielektrik dianggap sebanding dengan frekuensi dan<br />
kuadrat tegangan. Pada frekuensi 50 Hz dan tegangan 110 V,<br />
losses adalah 0,6 watt.<br />
P 50 Hz,110V =<br />
0,6<br />
W<br />
150 ⎛ 30 ⎞<br />
P 150 Hz,30V = × ⎜ ⎟ × 0,6 = 0,134 W<br />
50 ⎝110<br />
⎠<br />
250 ⎛ 5 ⎞<br />
P 250 Hz,5V = × ⎜ ⎟ × 0,6 = 0,006 W<br />
50 ⎝110<br />
⎠<br />
2<br />
2<br />
168 Sudaryatno Sudirham, <strong>Analisis</strong> <strong>Rangkaian</strong> Listrik (3)
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