Answer / shailesh

the voltage between the three phases is equal to the vector
sum of the three voltages which are at a phase difference of
120 degree so by taking the vector calculations of these
voltages the magnitude of the voltage becomes zero

Answer / nisha

3 phase supply means there are 3 currents from different source.
they are similar currents with same voltages (mostly 230V) but there phase is different under the balance load condition. But here all three phases are of same voltage. hence the voltage between all three phase is zero.

Answer / prasad asolkar

the phaser sum of all 3 phase current is 0 as every current departs by 120 degree from its successive current.that's why sum is 0

Answer / sandip upare

Only if you switch off the power during running of any
equipments its becomes zero. that means in switch off
condition only.

And yes the voltage can be unbalance which is totally
depends upon the load or phase failure during running

Answer / charlie saae

the voltage is changing all the time between positive to negative.
one or three phases in doesn't matter,
at one point in each cycle it will measure 0v

what is the need of starter in tube light and what type of starter is used in that?

0 Answers   Sedemac, Sepco,

---

a 11 kv line is grounded and a 110 kv line is grounded. which line have the greater current flow?

4 Answers  

---

can we use ELCB and RCBO in one db

6 Answers  

---

Is it really necessary to have reactive power in transmission line to transfer the power from one place to other?

3 Answers   Power Grid,

---

what is the method to calculate the voltage drop for number of meters Example 250volts I/p at one end if the cable length is 50 meters what could be the drop?, after 100 meters how much? needs formulae.

1 Answers  

---

---

Why r used of cable 50sq.mm and above size cable in 3.5 core. And below size in 4 core ? any technical reason please explain it

2 Answers  

---

how does the rotating m.m.f is produced in the 3-phase induction motor and how the poles are created in 3-phase induction motor ?

0 Answers  

---

What is the main purpose of relay?

1 Answers  

---

in an ac series circuit there are 30 bulbs are connected in a serial set.what will happen if one bulb is fused and we removed the bulb and reconnect with the remaining bulbs? (29 bulbs). will the brightness of other bulbs increase or not?

3 Answers  

---

at meter room 50 hrc switch installed,but there are not get earthing proper,so what happen?and 11kv transformer out put going in to hrc main 400a three nog each? so earthing is require for all switch? (some customer made earthing at there home.)

0 Answers   Ebrahim Textile, Siemens,

---

what is ignition?

1 Answers  

---

Why electrical power generation and transmission done in 3 phase system not more than 3 phase ?

0 Answers  

---