Answer / pradyumna chandra panda

In 3 phase supply phases are120 degree electrical aparts each and for a technician it is easy to use such connect the machine with sequence or obtain uniform rotating magnetic field in motor, so India follow this.

Answer / raheel4u

3 Phase has 3 wires carrying power (a 4th wire has ground). The voltages on the 3 wires with respect to ground each look like a normal sine wave at 110V but the peaks of the sine waves are delayed evenly so that wire 1 peaks, then wire 2, then wire 3, then back to wire 1 in equally timed spacing. This is called 120 degree phase between any 2 wires. This is the power coming out of power plants. 3 Phase is easy to use or create with generators and motors. 3 Phase was chosen because it needs less copper to carry power long distances. Modern technologies (transistors) can be very efficient with converting DC voltages now but when the power grid system was created we mostly only had transformers and wires.

what is meant by oil filled power & distrubution transformer ? if anybody know the link of detail about above transformers means plz send it i have interview on this week ? plz help me

3 Answers  

---

what is PI value and its significance for insulation testing?

3 Answers  

---

what are the points to be consider for MCB(miniature circuit breaker selection?

3 Answers  

---

Can u tell me about HVDC transmission?

6 Answers  

---

What is the SCR system in drilling rig.

2 Answers   Weatherford,

---

---

Define the term Capacitance and Inductance?

0 Answers  

---

why use only sf6 circuit breker in 400 kv sub station

5 Answers   BARC,

---

1)we have 1000 cfm Blower,Dia-1Mtr,Velocity of air 94 m/s 2)We have Natural Air velocity 94m/s 3If i Put Wind Mill in natural air ,speed is 94m/s Then it will generate Assume 100kw 4)If i put same wind mill across the Blower,air speed is same 94m/s now the Question is Will it generate 100 kw?

0 Answers  

---

Why water bubbles when D.C. Current is passed through it? Why not when A.C. Current is passed?

0 Answers  

---

what is diffrence b/w -48vdc and +48vdc ?

1 Answers  

---

why we did not mention ryb like byr in 3 phase

2 Answers   Ford,

---

I want to put this query to SENIOR & EXPERIENCED ELECTRICAL ENGINEERS. 1)I want to know about the control circuit diagrams for control panels. I found it difficult to understand. Is there ant booklet through which we can learn the circuit diagrams? 2)I want to learn about conduiting, laying cables, preparing cable schedules and various techniques which is the part of building infrastucture(construction field). I don't have any experience in this area. I have experience in control panels only. that's why i am not getting any opening in building infrastucture (construction field).Can I get the job in this field as Trainee Engineer? How to enter this field? I need job in PUNE

0 Answers  

---