keeping in view of parallel operation which of the 3 phase transformer connect

keeping in view of parallel operation which of the 3 phase
transformer connection are possible?
a)delta-delta to delta-star b) delta-delta to star-delta c)
star-star to delta-delta d) delta-star to star-delta

Question Posted / minakshi

4 Answers
23847 Views
Ecil, Siemens, I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

keeping in view of parallel operation which of the 3 phase transformer connection are possible? a..

Answer / nadeem

B.delta-delta to star-delta not possible parallel
operation.
C.star-star to delta-delta that is possible parallel
operation.
D.delta-star to star-delta also that is possible parallel
operation.
A.delta-delta to delta-star not possible parallel operation
but im not conferm.

Is This Answer Correct ?

50 Yes

10 No

keeping in view of parallel operation which of the 3 phase transformer connection are possible? a..

Answer / ravi

For parallel operation of transformers as you know the
requirements, 1. magnitude of the voltage, 2. phase angle
difference between the i/p and o/p voltages, 3. equal
percentage impedance of the transformers.

I don't think that whatever you are asked configurations
same vector symbol will get. So we can't do paralleling.
if you get the same phase angle difference ypu can go ahead
with paralleling.

Is This Answer Correct ?

16 Yes

10 No

keeping in view of parallel operation which of the 3 phase transformer connection are possible? a..

Answer / vikas tomar

If the transformers are star-star or delta-delta, they can
not be paralleled with star-delta or delta-star,As there
will be the phase difference of 30 degree b/w the secondary
voltages for the same supply voltages across the primaries
of the two transformers.It will result the circulating
current in transformer windings.
Hence option (d)is correct answer.

Is This Answer Correct ?

6 Yes

0 No

keeping in view of parallel operation which of the 3 phase transformer connection are possible? a..

Answer / sourabh

A)delta-delta or delta star is possible

Is This Answer Correct ?

6 Yes

10 No

Post New Answer

More Electrical Engineering Interview Questions

1. alternator has full load regulation of 4% when pf of the load is 0.8 lag, 1500 rpm. full load regulation of 1400 rpm for 0.8lag will be ________ ?? 2. torque angle of a sync m/c operating from a constt voltage bus is usually defined as space angle between _______ . 3. method most effective in finding out no load losses in large DC shunt motoris ______ . 4. current carrying capacity of fuse material depends on ______ . 5. coil has res. 10 ohm, inductance 1H. what wil be current after 0.1sec after switching on to a 500V DC SUPPL ? ? 6. effect of phase lag compensation on servo systems ___________ . 7. rotor of a dc machine is usually supported upon ______ . 8. DC motor is preferred to AC motor in which application ?? 9. 3 nos of 10:1 Xmer are connected in Star-Delta to supply a load at 230V.the supply voltage must be ______ . 10. voltage source produces max current in which circuit. 11. cal. power, if current and voltage are out of phase by 90 degree. 12. suitable length of Xmission line of power at 66 KV. 13. Which of the theorm helps in simple computation when the load across a ckt is varying ?? 14. what is the adopted line length for power Xmission of power by cables ??

5 Answers TATA,

limitation of conductor height on ground when we consider EMC

0 Answers

sir pls send the je exam - 2008 and other model question papers..

0 Answers

Is there any standard guidelines/Criteria to design NGR/NGT.?

0 Answers

Explain difference between aluminium coductor & copper coductor.

4 Answers

How many types of interlocking use in screw type air compressor,make-Kaser(BSD MODEL)?

0 Answers Automobile, Siddhi Vinayak,

Why usually in all electrical equipment taking more current in Y pahse like pumps,compressor,or any other applications