Answer / pritish

junction cable is placed in between the trans. and a sub station due to the following reasons.
when a high voltage surge fall on the transmission line it propagates to the either side of the tr. line. we know that the surge impedance of a transmission line is nearly 400 ohm and the surge impedance of a cable is 40 ohms. hence when a surge comes to the sub station from tr. line, the magnitude of surge voltage decreases to a great extent on the cable side due to voltage divider rule. hence the equipments in the SS can be protected.




for details contact :pritish.nath@gmail.com

if we use fuse in neutral what will happen?

9 Answers   L&T,

---

single phase 230v three phase voltage 415volt why we aren't used line voltage 690v?

7 Answers   Citec,

---

What is voltage 

4 Answers  

---

WHAT IS THE DIFFERNCE BETWEEN AIS AND GIS IN SWITCH GEAR?

5 Answers   L&T,

---

how to set the overload setting in the thermal overload relay?? is there any calculation in that??

3 Answers  

---

why 3 phase motors are preferable over single phase motors ?

6 Answers  

---

State magnitude criterion.

0 Answers  

---

what is cable meggering formula for low voltage ?

0 Answers  

---

in soft starter system for 375 KW 3 ph induction motor for multi stage vertical pump, two thyristers failed causing shorting of thyrister. the motor winding failed while starting.What is the cause and what is the effect in above case

1 Answers   KPCL,

---

what is power factor

6 Answers  

---

Why does capacitor block dc supply?

5 Answers   Bhel,

---

what is vector diagram in three phase transformer

1 Answers  

---