Calculate Phase current
Calculate Phase current
(OP)
Can anyone tell me how to calculate phase current on a DELTA
connected Transformer, Primary side?
connected Transformer, Primary side?
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Calculate Phase current
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Calculate Phase currentCalculate Phase current(OP)
Can anyone tell me how to calculate phase current on a DELTA
connected Transformer, Primary side? Red Flag SubmittedThank you for helping keep Eng-Tips Forums free from inappropriate posts. Reply To This ThreadPosting in the Eng-Tips forums is a member-only feature.Click Here to join Eng-Tips and talk with other members! |
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RE: Calculate Phase current
If you are talking about the current in each 'phase' winding of the transformer (internal to the transformer) then the current in each 'winding' arranged in delta would be the rated current divided by 1.732, at full load.
1.732 is square root of 3.
If you mean the current in each of the three conductor feeding the tranformer, it is the rated current of the unit at full load. This is also the line current.
At any other loads, the current in delta winding is line current divided by 1.732.
RE: Calculate Phase current
RE: Calculate Phase current
P = 3^0.5 x V line-line x I line
where:
P = Power rating of trsf in VA
3^0.5 = square root of 3
V = line to line voltage
I = Full load current
You can use this formula for either star or delta and on either side of the transformer.
For delta connection:
V line = V phase
I line = 3^0.5 x I phase
For star connection
V line = 3^0.5 x V phase
I line = I phase
Example
100kVA trsf, 11kV/380V delta primary /star secondary
Primary side
P = 3^0.5 x V line-line x I line
100 000 = 1.73 x 11000 x I line
I line = 5.249A
I line = 3^0.5 x I phase (delta connection)
5.249 = 1.73 x I phase
I phase = 3.03A
Secondary side:
P = 3^0.5 x V line-line x I line
100 000 = 1.73 x 380 x I line
I line = 151.934A
I line = I phase (star connection)
I phase = 151.934A