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haysam
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Join Date: Oct 2013
Location: Saudi arabia
Posts: 40

Three Phase Separate Autotransformer 500 MVA Arrangement

07/12/2018 8:00 AM

Hi everyone

I would like to ask about power transformer arrangment

I work at 500/220 KV substation

We have to get new tie transformer but we dont have sufficient area for this extension

Really we need to change the ordinary three single phase power transformer arrangement

We have to put two single phase transformer at same alighment and the third phase will be behind the two another single phases

Now i would ask there is problem if i don't put the three single phase transformer at the same alighment

Specification

Mva for each phase 167 mva

The total power 500 mva

Voltage 500/220 KV
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Pathfinder Tags: Transformer -auto transformer -substation -high vo
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TonyS
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#1

Re: Three Phase Separate Autotransformer 500 MVA Arrangement

07/12/2018 8:20 AM

As long as they’re all clearly identified I can’t see a problem.

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haysam
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Location: Saudi arabia
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#3
In reply to #1

Re: Three Phase Separate Autotransformer 500 MVA Arrangement

07/12/2018 9:49 AM

Thanks for your replay
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Ivanov327950
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#2

Re: Three Phase Separate Autotransformer 500 MVA Arrangement

07/12/2018 9:28 AM

There is not.

However, keep in mind that 3 single phase transformers will be bigger, and hence, more expensive.

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haysam
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Location: Saudi arabia
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#6
In reply to #2

Re: Three Phase Separate Autotransformer 500 MVA Arrangement

07/12/2018 2:28 PM

Thanks for your replay
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PWSlack
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#4

Re: Three Phase Separate Autotransformer 500 MVA Arrangement

07/12/2018 12:31 PM

This is the sort of thing that needs to be discussed with the Sales Engineer from the transformer manufacturer. Arrange a site visit for this individual!

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haysam
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Location: Saudi arabia
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#7
In reply to #4

Re: Three Phase Separate Autotransformer 500 MVA Arrangement

07/13/2018 6:32 PM

thanks for you
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RAMConsult
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#5

Re: Three Phase Separate Autotransformer 500 MVA Arrangement

07/12/2018 1:16 PM

Electrically you will have to ensure that the sequence impedances are not affected by the asymmetrical arrangement of the transformers and interconnecting buswork.

Mechanically you will need to check that the buswork can withstand the asymmetric magnetic forces that will occur when fault currents are flowing during different types of faults/short circuits.

The protective relaying should operate correctly assuming that the burdens are balanced.

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haysam
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Join Date: Oct 2013
Location: Saudi arabia
Posts: 40
#8
In reply to #5

Re: Three Phase Separate Autotransformer 500 MVA Arrangement

07/13/2018 6:35 PM

thanks for you very match

but can i ask you more question if this transformer work in parallel operation with another transformer this arrangement will effect on the parallel operation

also i need sources for point you give me at your comment to collect data more because this points illustration

with my best regards
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RAMConsult
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#9
In reply to #8

Re: Three Phase Separate Autotransformer 500 MVA Arrangement

07/15/2018 6:49 PM

You may be able to parallel them assuming that you provide equal impedance paths between between units and banks, but you have not provided enough information regarding the physical and electrical properties of the arrangement to comment.

Suggest that you get a copy of the "J&P Transformer Book" to learn about how differences in configuration affect the sequqence impedances, especially the zero sequence. There are many fine technical papers regarding the mechanical forces on asymmetrical buswork arrangements. You will find that your favorite search engine(s) will provide many references to both of your inquiries.

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haysam
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Location: Saudi arabia
Posts: 40
#10
In reply to #9

Re: Three Phase Separate Autotransformer 500 MVA Arrangement

07/16/2018 4:15 AM

Thanks very much

In another topic i wrote my thesis (master tgesis and publish paper at ieee conference ) i really hope if i can send it to you to take your opinion about my work at transformer aging and life time assesment
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Users who posted comments:

haysam (5); Ivanov327950 (1); PWSlack (1); RAMConsult (2); TonyS (1)

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