Transformer thermal model of the disk coils with non directed oil flow
A power transformer is a static piece of apparatus with two or more windings which, by electromagnetic induction, transforms a system of alternating voltage and current into another system of voltage and current usually of different values and at same frequency for the purpose of transmitting ele...
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| Format: | Thesis |
| Language: | English English English |
| Published: |
2013
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/1937/1/24p%20MANSOOR%20TAHA%20YAQOOB.pdf http://eprints.uthm.edu.my/1937/2/MANSOOR%20TAHA%20YAQOOB%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/1937/3/MANSOOR%20TAHA%20YAQOOB%20WATERMARK.pdf |
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| Summary: | A power transformer is a static piece of apparatus with two or more windings which, by
electromagnetic induction, transforms a system of alternating voltage and current into
another system of voltage and current usually of different values and at same frequency
for the purpose of transmitting electrical power. The temperature of disk coil has a close
relation with the transformer age. In oil immersed transformers, oil guides are applied
generally to enhance the cooling effects for disc windings. In some cases disk windings
without oil guides are used. Non directed oil flow of a disk transformer in this model is
non-guided by the oil flow natural circulation (thermally driven). The model is focus to
investigate the temperature rise in the oil-filled transformer windings. An iterative
solution is required to solve the equation to find the oil velocities, change in the oil
temperature rise after each disk coil that passing through it, and disk temperature. The
concept in all disks coil is the same because no block washer for each group (pass) to
control of the oil flow as directed oil flow. Pressure decrease with increase the total
number of coil disk or high of coil is effecting the frication and gravitation acceleration.
As a disk temperature is very sensitive to the changes of the variables, so designing a
suitable parameter for a single power transformer is very important. Matlab software that
a good way to solve the iterate equations and modeling disk transformer where the result
is nearly accurate.
Keywords: disk transformer, thermal model, oil temperature rise, oil velocity,
pressure, iterative solution |
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