Answer / biren

In overhead line there is air around the bare conductor which is a insulation layer but the earth around the under ground cable is a good conductor. so there is more chance of insulation failure, hence to avoid the normal insulation failure more insulation is provided which increases the cost.

Answer / sk.azhar.m

An underground line is fill in the earth and when if the leakage current will flo in the erth the current rating will very high in the cable that is very dangerous for human and other and in the the overhead line the air is not good conductor of electricity while an underground line is more insulation than overhead line for this reason the insulation cost is more in underground system

why do we require two lines one phase and a neutral for an ac transmission..is neutral potential zero..?if yes y carry a neutral line from generating station itself...why dont we take it from ground

1 Answers  

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In a distribution system,having 3phases & 1 nuetral.ecah phase to neutral is 230V,line-line voltage is 440V,but what is the voltage of each line.but it should obey the KVL law.

2 Answers  

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in star-delta tranformer,if the input of star connection is 400/7v 3 kva then what is the output of delta connection?

0 Answers   Elicon,

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3 Answers  

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what is the purpose of interpose t/f in control and relay ckts?

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How to generate neutral in DG set?

3 Answers  

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work of choke in florocent tube circuit ?

0 Answers   Bhel,

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Practical applications of series connected resistances? 

1 Answers  

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WHAT IS THE USE OF ANTIPUMPING CONTACTOR IN HT BREAKERS

8 Answers  

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what is d check in dg 1500kva

0 Answers  

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