Answer / mani

we can not generat 4 phse , 5 phse because of phase angle .
if we generat 4 phase we can not make same pahse angle
betwen the phase that is why.

ex.for 3 phase, phase angle diff. ab=120,bc=120, ca=120.

for 4 phse (abcd ) ab=90, bc=90,cd=90,ad=90 but
ac=180,ad ,bd also like that that is why we cnat generat 4
phase and some other else.......

Answer / sarkar

we cant genrate 4 or 5 phase supply as genration of 3 phase is convinient

Answer / sathish charles.s

we cant generate 4phase or 5 phase because there equal
displacement b/w the each phase of 120,like R Y B...
phasse angle b/w R-Y,Y-B,B-R=120,

If suppose there is 4 phase then it will be like A B C D,A-
B=90,B-C=90,C-D=90,D-A=90,a-c=180,,,etc phase will create
problem,so we cant generate 4,5 phase....


But i have doubt y cant we generate 2 phase

Answer / hossam samir

winging is always constructed in 360 degrees angle. 3 phase
winding is built after 120 degree angle. If a 2 phase phase
wingind is designed, it is 2 , 180 degree angles winding,
which is exectly same as 2 coils in series. Similarly, 4
phase has same effects, a pair of 2phase winding.

I WOULD LIKE NOW WHY WE CANT USE SOME CT FOR MESARING AND PROTECTION

2 Answers  

---

how can motor both beasrings insulation resistance can be check?

0 Answers   GE,

---

good morning sir, can u please tell me what type of questions asked in jindal so i can do my best in exam.

3 Answers  

---

What is TVSS Protection???

2 Answers   Emerson,

---

Can HT cable(11kv cable) be used for 415V, 700A requirement.

5 Answers  

---

How do you commission a power Transformer?

1 Answers   EEI,

---

what is dead tank CT AND what is live tank CT

2 Answers   TATA,

---

in power generator normaly voltagr betwween esth to neutral is 0 but my work place generator show the volatge is 60v any body know why? thanks

0 Answers  

---

what's burden resistor, why it's used?

1 Answers   Bhel, TVS Group,

---

How to calculate the External Resistance required for 60HP slipring motor in case no any data of the Motor is available???

0 Answers  

---

how can a transformer test by megger?

1 Answers  

---

auto reclosing scheme for radial ehv feeder is to be implemented or not?

1 Answers   State Board,

---