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adeblaskar
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Join Date: Oct 2007
Posts: 7

Advantages Of Star Delta Transformer

10/26/2007 10:26 AM

In our switchyard we have used a 220KV/6.6KV transformer for distribution? I want to know why only this configuration has been choosen...is there any specific advantage...can anyone help me please?
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JohnDG
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#1

Re: advantage of star delta transformer

10/26/2007 10:55 AM

Type "star delta" into google - you'll find out all about it.

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Bill
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#2

Re: Advantages Of Star Delta Transformer

10/26/2007 2:18 PM

Because the power system engineer designed it that way???

Maybe they ran across a good deal on a large number of 6.6kV/240V step-down transformers which more than offset the cost of larger conductors and higher ratio transformers.

Typically, long-distance transmission lines are kept at high voltage. Are the 6.6kV lines covering any significant distance? Here (US), it's not uncommon to have 7.2kV distribution lines running through residential, commercial and light industrial areas.

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Anonymous Poster
#9
In reply to #2

Re: Advantages Of Star Delta Transformer

12/23/2009 5:17 AM

if u don't know keep quit. Don't explain as a well known, it effects somebodies thoughts.
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Sravanthi
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Join Date: Oct 2007
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#3

Re: Advantages Of Star Delta Transformer

10/26/2007 11:14 PM

I feel it is because the zero sequence currents circulate themselves within the delta loop, thereby safeguarding the load, without getting it overloaded.

and since from the supply side most of the times we take star, for the load side or secondary side, when we need more current, and less voltage(Il=√3 Iph and Vl= Vph) we get delta to supply different loads.
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adeblaskar
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Join Date: Oct 2007
Posts: 7
#7
In reply to #3

Re: Advantages Of Star Delta Transformer

10/29/2007 10:22 AM

thank you madam so musch for your reply....but can u tell me how can we restrict fault level in delta ,i read that it is easy to reduce fult level of trafo in delta side than in star side how??
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Sravanthi
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Join Date: Oct 2007
Posts: 3
#8
In reply to #7

Re: Advantages Of Star Delta Transformer

12/05/2007 10:21 PM

i am sorry for this much late reply. i dont really know much about practical applications of it. If you hav got the answer. please post it back to the forum so that even i'll get to know about it.
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PWSlack
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#4

Re: Advantages Of Star Delta Transformer

10/29/2007 5:03 AM

National standards? It would be more common to find 132kV/33kV/11kV in the UK.

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elbf2801
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Join Date: Feb 2007
Posts: 60
#5

Re: Advantages Of Star Delta Transformer

10/29/2007 8:59 AM

The first point to be borne in mind is the type of system grounding.

Normally the load side has its source grounded. Therefore, the 6.6kV side would be grounded.

if this is so, one has to provide means to zero sequence circulate and this would be the reason for chosing a delta winding.

If the system is ungrounded this might not be necessary, but you must, conversely , take some other things into accounte, such as insulation level of the 6.6kV system, fault discrimination, windings and cables insulation, lightning arrester ratings and so on.

Regards
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elbf2801
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Join Date: Feb 2007
Posts: 60
#6
In reply to #5

Re: Advantages Of Star Delta Transformer

10/29/2007 9:03 AM

Where stated in my reply ZERO SEQUENCE you must read 3rd harmonic
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Users who posted comments:

adeblaskar (1); Anonymous Poster (1); Bill (1); elbf2801 (2); JohnDG (1); PWSlack (1); Sravanthi (2)

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