100 KVA का एक एकल फेज भार 2000 V पर एक संचरण लाइन पर वितरित किया जाता है जिसमें R = 1.4 Ω और X = 0.8 Ω होता है, जब भार का शक्ति गुणक एकता होता है तो प्रेषक छोर पर वोल्टेज क्या होता है?

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ISRO (VSSC) Technical Assistant Electrical 2017 Official Paper
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  1. 1680.3 V
  2. 2980.1 V
  3. 2068.3 V
  4. 2070.4 V

Answer (Detailed Solution Below)

Option 4 : 2070.4 V
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Detailed Solution

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धारणा:

एक एकल फेज संचरण लाइन में

VS = VR + IL∠ϕ Z

जहाँ

VS = प्रेषक छोर वोल्टेज

VR = ग्राही छोर वोल्टेज

IL = संचरण लाइन के माध्यम से बहने वाली धारा

Z = लाइन की प्रतिबाधा

ϕ = फेज कोण

गणना:

दिया हुआ-

SL = 100 kVA

VR = 2000 V

cos ϕ = 1, ϕ = 0°

Z = R + j X = 1.4 +j 0.8

|IL|= 100 x 103 / 2000 = 50 A

IL ∠ϕ = 50 ∠0°

अब प्रेषक छोर वोल्टेज है

VS = 2000 + 50 ∠0° (1.4 +j 0.8)

VS = 2000 + 50(cos0° + sin0°)(1.4 +j 0.8)

VS = 2000 + 70 + j40

VS = 2070 + j40

VS = 2070.40∠1.1°

|V­S| = 2070.40 V

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