तीन- कला संतुलित भार में शक्ति मापने के लिए दो वाटमीटर का प्रयोग किया गया है। वाटमीटर पाठ्यांक क्रमश: 8.2 kW और 7.5 kW हैं। सक्रिय शक्ति क्या होगी?

This question was previously asked in
MPMKVVCL Bhopal JE Electrical 24 August 2018 Official Paper
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  1. 61.5 kW
  2. 0.997 kW
  3. 0.7 kW
  4. 15.7 kW

Answer (Detailed Solution Below)

Option 4 : 15.7 kW
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दो-वाटमीटर विधि द्वारा शक्ति माप

n-चरण शक्ति मापन के लिए, 'n-1' वाटमीटर की आवश्यकता होती है।

इस प्रकार 3 चरण प्रणाली के लिए, 2 वाटमीटर की आवश्यकता होती है।

दो वाटमीटर का पाठ्यांक इस प्रकार दिया जाता है:

\(W_1=V_LI_Lcos(30+ϕ)\)

\(W_2=V_LI_Lcos(30-ϕ)\)

जहाँ, VL = लाइन वोल्टेज

IL = लाइन धारा

cosϕ = ऊर्जा घटक

कुल शक्ति व्यक्तिगत वाटमीटर के रीडिंग के योग के बराबर है।

\(W_T=W_1+W_2\)

\(W_T=\sqrt{3}V_LI_Lcos\phi\)

गणना

दिया गया है, W1 = 8.2 kW

W2 = 7.5 kW

\(W_T=8.2+7.5\)

\(W_T=15.7\space kW\)

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