Answer / raovasuki17

first of all you have to use multimeter to identify the
coil teminals. segregate it in two lines as 2 x 3 . ie top
3 terminals and bottom 3 terminals.

Next take a Small DC power supply with 3 volt and a
milliampere meter( DC ). connect this voltage to one of the
coils with milliampere meter in series( Milliampere meter
should be of center zero type ) close the supply voltage to
the coil with make and break it immediately. observe the
deflection whether it is on forward side or reverse side.
and mark one terminal for whcih +ve suplly is connected as
Start and the other ( _ ve )end as Finish. do this
process for other two coils also. once you know the top 3
start points and finish points of the coil. you are almost
there. now you short ckt all finish ends. you are left
with 3 start terminals. ie your STAR connection.

For Delta connection connect finish end of the first coil
to start end of the second coil, finish end of second coil
to start end of third coil and finish end of 3third coil
to start end of first coil. now you have theree junctions.
now your connection is in Delta mode.

What is YNyn Transformer? and what are the other types in this?

3 Answers  

---

What is the effect of impedance on the heat losses in case of AC system??? Does heat losses really depends on the impedance or depends only on resistive component only..??

4 Answers  

---

how to converate kva to kw ?

4 Answers  

---

do you have some of interview Questions in power and genrator section in general whith answers

0 Answers  

---

How to calculate & connection of 900KVA generator 2 sets & load(1500A)? How to choose cable size and ACB size for this load & generator? please explain me detail. Regards, Mr.Han

3 Answers   Powermec, TATA,

---

what is the Pickup/drop off ratio in BCPU relays

0 Answers   DNJ Energy LLC,

---

what are different types of electrical windings? i know the distributed winding ,concentrated winding etc but i want some detailed information, in what condition we will use distributed,concentrated windings what are the difference between them which is best, how induced emf changes by using different types of windings 20 hours ago - 1 week left to answer

0 Answers  

---

can we use the same fuse for both ac and dc?

3 Answers  

---

Can we see the poles in the motor?. if yes then how can we see plz tel me

2 Answers   MRF,

---

How maesure earth neutral value & how much maximum value value required in between earth & neutral.

0 Answers   Bellsonica, NEC,

---

transformers? power factor? machiences?

3 Answers  

---

what is LUX?

4 Answers   NTPC,

---