Answer / sri244

Yes India freq. is 50Hz,because of our started electricity in 1902 in SIVASAMUDRAM from Karnataka.That is 4.5 mega watts. so
on that time we are choosing 50 cycles per second.But in u.s.a. it is 60HZ there is small power losses occur.NOw in India we change in 50HZ but it is not possible. So that's way we are using "power factor improved techniques".So this technique used to minimise power lossess.

Answer / m.kumaran

Normally the formula for speed is N=120f/P
N=Speed in RPM
f=Frequency
P=No of poles
Example
f=50Hz
P=2
so N=3000 RPM.but we use 4 pole machine we get 1500 RPM
The indian machines are manufactured only 2&4 poles only so
we get 50Hz frequency. but most of indian power generating
stations are follow this technique. but we want to change
this method total methods of generating station will de
changed.

i Have 1000kva 11/.4 kv voltemp make t/f Its a 2 year old. i wants to known how much iron losses & copper loses during no load condition.

2 Answers  

---

Whats the minimum value for I.R. that can be allowed for HT & LT alternators for operation?

1 Answers  

---

how DC motor operating in detail .pls any one guide me .iam not clear idea about that .thank u

2 Answers  

---

what will happen if capacitor bank is used in generation side?

2 Answers  

---

11 kv line me tino phase takra jaye to present time me approximately voltage aur current kya hoga...

2 Answers   Electrical, Electrical Tech, Videocon,

---

---

What are the transformer losses?

0 Answers  

---

My question is whether bellow formula is correct to find bus size for 46kA for 0.5 second & what is RT in bellow formula. formula to calculate the size of busbar to withstand the thermal stresses due to currents with duration of 0.2 sec to 5 sec. Sp = RT( I x I x t) / K Where Sp – is the cross sectional area of bus bar in millimeters. I -    is the value of AC fault current. t -    is the operating time of disconnecting device in seconds. K –  is the factor depending on the material of the conductor, insulation and initial and final temperature. Value of ‘k’ for copper is 143.

0 Answers   Premier,

---

Why breakers not synchronized when the synchroscope is going in the anticlockwise direction?

2 Answers  

---

with the help of drive can we run the 50hz motor on 100hz,what will be its effect.

3 Answers   BPL,

---

is it possible to use a tranformer to regulate an unstable system voltage?

3 Answers  

---

why HV test for cables?.why 0.7times?

1 Answers   Bosch, Prince Food Products,

---

What is the black star?

2 Answers  

---