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dilip bhasker
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Join Date: Dec 2009
Posts: 2

How to Select Transformers

12/15/2009 9:22 AM

what is basis to selection of a 3phase 11 KV transformer.If some of single pahase load and some of 3 phase load are connected to this transformer.Example 12.2 KW single phase load of each houses for 500 house and 25 Nos of 3 phase pumps 5 HP each .Please help me select the 11 KV transformer.
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dilip bhasker
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Join Date: Dec 2009
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#1

Re: How to Select Transformers

12/15/2009 9:35 AM

hhhhhhhhkiji
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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

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#2

Re: How to Select Transformers

12/15/2009 10:08 AM

How are the single phase loads distributed across the transformer phases?

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wareagle
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Location: Alabama
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#3

Re: How to Select Transformers

12/15/2009 10:44 AM

What are the loads in each house? What are the 5 HP use for?
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jhonson
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Location: PA
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#4
In reply to #3

Re: How to Select Transformers

12/15/2009 12:15 PM

3 Hp is for the pump to pump the water to the water tank (countries like India has 3 phase pump for this purpose) unlike in USA , I think 12.2 Kw for each house, little high.
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wareagle
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#5

Re: How to Select Transformers

12/15/2009 5:36 PM

12kw seems high to me also. Thats why I wanted the load. Does the load consists of

lts, clothes dryer, water heater, range, Refrig, Dish washer, A/C unit, microwave?

need some idea what the load will be. Is the voltage to the house 240 volts?

Substation transformers come in standard sizes. What is the primary voltage of the transformer?
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Patrick Whowha
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Join Date: Nov 2009
Location: Nnewi,Anambra,Nigeria
Posts: 146
#6

Re: How to Select Transformers

12/16/2009 10:43 AM

If u are very sure of yr load information.Lets see this.

Yr total load will be 12.2kw x500 + 3.73kw x 25(.746x5x25)=6100kw + 93.25kw=6193.25kw

I=6193.25/1.732x415 x.8=6193250/575.024=10770.42Amps; kva=1.732 x415 x10770.42 =7741562.49 =7.7MW or 8.0MW,11KV/415V 3PHASE Transformer.

If u wish to mark it up by some margin,then use 25% and get yr Transformer MW and distribute yr loads and balance yr phases well both on single and 3 phase.Make sure each of yr Transformer output 3 phases are almost having same current value when loads are ON.

Patrick Whowha

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Users who posted comments:

dilip bhasker (1); jhonson (1); Patrick Whowha (1); PWSlack (1); wareagle (2)

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