Answer / shanmuganathan prathap

WE CANT CARRY HIGH CURRENT IN TRANSMITION LINE BCOZ NEED
BIG SIZE CONDUCTOR.THATS USING HIGH VOLAGE ACCORDING TO
P=VI SO V=1/I*P

Answer / lakshmi

at constant power for higher voltages the current is
reduced according to the equation P = V I cos (phi)
then I = P/V cos (phi)
reduced current means less losses and incresed efficiency.
and also the size of the conductor is less due low current.
hence it is economical to transmitt higher voltages.
thats why the generated voltages are stepped up to higher
voltages.

Answer / pandeyrahul

high current means more i*i*r losses which decreases the
efficiency

Answer / arunraj

Because to minimise power loss while transmitting.
For example: If power of 1000watts has to be transmitted to
certain distance through transmission line having a
resistance R ohm.If it was transmitted at 200volt, the total
power loss in transmission is

power=VI=1000watts

current=power/voltage=(1000/200)=5 Amps

power loss=(I*I*R)=5*5*R=25R watts
If it was transmitted at 2000 volts,

I=1000/2000=0.5 Amps
power loss=(0.5*0.5*R)=0.25R watts
now we can see that at high voltage transmission line
current is small. so we can use conductors with small
thickness instead large bars.

Answer / shahbaz shaikh

as we know that power transmission is depends on vtg and
current if we want to transmit high current then (as
current increases area and size ,cost incraeses) hence
transmission should be in high voltage

How is the air circuit breaker quenching the arc. If it is by air means, where is it come from?

1 Answers  

---

HOW DISTANCE PROTECTION IS DONE IN EHV TRANSMISSION LINES? WHAT IS THE BASIC TECHNIQ OR FUNDA USED BEHIND THIS ? SPECIALLY EXPLAIN?IMPEDANCE METHOD.

2 Answers   ABB,

---

Describe the test procedure to determine the vector group

0 Answers   MPSEB,

---

What is DPR relay, And what for??

2 Answers   Engro,

---

Suppose i Have an Ac motor of 25Hp 1500 Rpm 50 Hz Can i run a motor 2500 Rpm by AC drives by increasing a frequency either it safe or not ....

2 Answers  

---

---

why the power cut problems occur in tamil nadu? may i know the exact reason.plz

17 Answers  

---

Difference between shunt, PMG and AREP excitation. Which is the most reliable between PMG and AREP.

0 Answers   ABB,

---

what is Thermocouple? Type of its.

2 Answers  

---

Is it required to use 2 nos of body earthings to any machine though if we use TP with E supply is provided to Machine?

2 Answers   HAL,

---

in Contactor opearation Why there is a difference in the values of the operate and release voltage in case AC supply

0 Answers  

---

How to reduce current flowing in neutral due to unbalanced load conditions in a three phase system.

1 Answers   IOCL, wbsedcl,

---

will three phase energy meter run without one phase

2 Answers  

---