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.

why distribution transformer is uesd in Delta/Star formation?is there any significance in doing this?If yes then breif?

3 Answers  

---

how to measure the dc current?

3 Answers  

---

Q.1:What protection will be used on HT and LT side of 33/0.4 KV, MVA transformer. Indicate capacities of protective device to be used. Q.2:Which types of back-up protections are used in the power transformers? What do you understand by the term over travel in the relay? Q.3:How star and delta connected winding transformer are provided from earth fault

0 Answers   MPSEB,

---

i have 3, 75hp motors and 10, 15 hp motors....and to run this motors continously with a generator how much rating(kva) of generator will suiteble....?

2 Answers  

---

when a machine act as genartor and as motor?

2 Answers  

---

why the NGR (neutral grounding resistor) always OFF during DG off?

0 Answers   Bhel,

---

How to do maintenance of transformer feeder.

0 Answers   KSEB, L&T, Siemens,

---

WHAT IS THE COOLANTS IN TRANSFORMER?

7 Answers   Bhel,

---

Consider three heater bank connected in 3 phase star with neutral.Each heater bank connected in each phase.So each phase get 230 volts supply.my question is,during balance condition, current flow in neutral or Not

0 Answers  

---

what is RFCT and Insulgard Relay & It's function?

0 Answers  

---

what is the difference between brush & brushless dc motor explain its operation ?

1 Answers  

---

when u are given a timer,push buttons and contactor, how do i practically make a star delta control circuit and a direct online control circuit?

1 Answers  

---