22 kVA, 20 kV, 50 Hz रेटिंग का एक तीन-फेज स्टार-कनेक्टेड सिंक्रोनस अल्टरनेटर जिसका प्रति फेज सिंक्रोनस रिएक्टेंस 8 है। प्रति फेज प्रेरित वोल्टेज 20 kV है और लाइन टर्मिनल वोल्टेज 15 kV है। मशीन की 3-फेज अधिकतम शक्ति ज्ञात कीजिए।

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SSC JE Electrical 07 Jun 2024 Shift 3 Official Paper - 1
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  1. 121.5 MW
  2. 112.5 MW
  3. 37.5 MW
  4. 211.5 MW

Answer (Detailed Solution Below)

Option 2 : 112.5 MW
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अवधारणा

अल्टरनेटर में 3ϕ शक्ति इस प्रकार दी जाती है:

\(P = {3V_pE_p \over X_s}sinδ\)

अधिकतम शक्ति के लिए, δ = 90°

\(P_{max} = {3V_pE_p \over X_s}\)

प्रति-फेज यहाँ, सभी मान प्रति-फेज मान होने चाहिए।

गणना

दिया गया है, \(V_L=15\space kV\)

 

\(P_{max} = {3\times 15\times 20 \over \ 8}\)

Pmax = 112.5 MW

विकल्प 2 सही होगा।

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