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THESE ARE THE QUESTIONS FROM THE SUBJECT POWER SYSTEM FUNDAMENTALS AND THE CHAPTER IS MECHANICAL DESIGN...

THESE ARE THE QUESTIONS FROM THE SUBJECT POWER SYSTEM FUNDAMENTALS AND THE CHAPTER IS MECHANICAL DESIGN OF TRANSMISSION LINES . THE ANSWERS ARE GIVEN WITH THE QUESTION PLEASE DO ALL THE QUESTIONS PROPERLY ..DONOT SKIP ANY STEP AND DO YOUR BEST

5. A string of 4 insulators has self-capacitance equal to 4 times the pin-to-earth capacitance. Calculate (i) the voltage distribution across various units as a percentage of total voltage across the string and (ii) string efficiency. [(i) 14·5%, 18·1%, 26·2% and 40·9% (ii) 61·2 %]

7). A substation receives 6000 kVA at 6 kV, 0.8 p.f. lagging on low voltage side of a transformer from a generating station through a 3-phase cable system having resistance of 7 Ω and reactance of 2 Ω per phase. Identical 6600/33000 V transformers are installed at each end, 6600 V side being delta connected and 33000 V side star connected. The resistance and reactance of each transformer are 1 Ω and 9 Ω respectively, referred to h. v . side. Calculate the voltage at the generating station bus bars [6778 V]

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