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

how can we connect the capacitor bank to improve the power factor?

5 Answers  

---

Why an ac systems are preferred over dc systems?

0 Answers  

---

what is mean by current

17 Answers   Wipro,

---

Any link for Electrical objective type questions ?

0 Answers  

---

What is PIR (pre inserting resistance) in 400kv EHV SF6 BREAKER? Why it use?

1 Answers   Adani,

---

What is the function of automatic Transfer Switch(ATS) in details

3 Answers  

---

why we are using2 wave trap in a feeder?

1 Answers  

---

please tell 1 ton equal to how many kilo watt?? in some converter software's that is 3.5 kw. is it right?

8 Answers   Mitsubishi,

---

In one village i have seen Earthing transformer's earthing line was also connected to the Transformer body to ground the transformer,can it be possible to maintain 0Volt reutral line this way?

2 Answers  

---

what is the Transformer Protection & Type ??

4 Answers   GE,

---

why transformer rating in kva?

7 Answers  

---

For Bus duct hi pot test, where we want to connect the return and ground leads?

2 Answers  

---