In 1000KVA Transformer why does we connect HT with delta connection and LT with

In 1000KVA Transformer why does we connect HT with delta
connection and LT with star connection.Illustrate by showing
formula?

Question Posted / rk

4 Answers
9201 Views
Tata Motors, I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

In 1000KVA Transformer why does we connect HT with delta connection and LT with star connection.Ill..

Answer / guest

Stepdown transformer(HT/LT) generaly used for distribution purpose so secondary side star is necessary and to increase voltage ratio primary side delta is necessary ie. in delta we get line voltage which is 1.732 time of phase voltage (star voltag) therefore less turn required in secondary side.

Is This Answer Correct ?

12 Yes

1 No

In 1000KVA Transformer why does we connect HT with delta connection and LT with star connection.Ill..

Answer / siddhartha agrawal

Generally HT side there is only three phase available while
LT side we require neutral. So we connect LT side Star
connection to use phase to phase voltage (415 volt) and
phase to neutral voltage- single phase load (240-220volt).

Generally HT side there is only 3 wire to reduce the cost of
transmission wire cost.

Is This Answer Correct ?

8 Yes

1 No

In 1000KVA Transformer why does we connect HT with delta connection and LT with star connection.Ill..

Answer / ap

we use delta connection in primary side (HT side) because if any fault current occurs it circulates in primary only and is not transmitted to secondary. Thus secondary is free of fault current.

Is This Answer Correct ?

4 Yes

0 No

In 1000KVA Transformer why does we connect HT with delta connection and LT with star connection.Ill..

Answer / bikki

In HT transformer, the primary side has less voltage stress since it is a step up transformer. But the voltage on secondary side will be high and hence the stress will be also high.As a result, the winding insulation requirement will cost a lot if the connection was Delta on secondary side;because in delta phase voltage=line voltage.
But if the secondary connection is star, then phase voltage will be Line voltage/(sqrt(3) which means the winding has to withstand less voltage stress and hence less insulation is required.Hence lesser cost.

Is This Answer Correct ?

0 Yes

0 No

Post New Answer

More Electrical Engineering Interview Questions

Wy transformer ratings are in multiple of 11 always?

2 Answers

what voltage to be select in megger for insulation resistance testing to L.V , H.T cables,motors and transfomer?and ohms valve should be giga ohms only or what?

1 Answers Deevya Shakti Paper Mills,

CONSIDER A 415V/200V STEP DOWN TRANSFORMER.CAN WE USE USE IT AS STEP UP TRANSFORMER BY GIVING 200V IN SECONDARY AND TAKING OUTPUT FROM PRIMARY?

3 Answers

what is the use of capacitor in online ups?

6 Answers Emerson, ups,

USE OF 8 WAY PAN ASSEMBLY

0 Answers TCS,

Z transform is use when system is not a) converges b) diverges

0 Answers CCP,

Why the efficiency of a three-phase induction is the motor is less than that of a three-phase transformer?

0 Answers

Meggering minimum acceptable Ohms for insulation resistance.

1 Answers TATA, Wood Group,

What are the effects of armature reaction on a DC machine and discuss the various methods to reduce the effect.

1 Answers

How PSV sizing being done

0 Answers

How can i get my certificate of competency as an electrical supervisor? I have complicated my B.Tech from Uttarakhand technical university this year (2012).

0 Answers ONGC,

We are installing a 1.6 MVA transformer at our crusher plant and the feeder of HPSEBL is 2 km away at substaion . and a VCB is installed in the substaion which is 2 km away from transformer so we need another VCB near the transformer.

2 Answers SCPL,

For more Electrical Engineering Interview Questions Click Here