Solving Transformer Per Unit Questions

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In summary, The conversation is about solving a question that involves converting into per unit and per phase equivalent circuits. The person does not know how to approach the question and asks for guidance and clarification on calculating bus1. They also mention not being able to attempt the question because they are unsure of the first step and whether the book or lecturer provides an equivalent circuit model. Per unit is defined as normalizing all component values and per phase means considering only one phase of the power lines.
  • #1
pingpong1
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1. attached is the question i am trying to solve.

I do not know how to do per unit questions.




2. Part a) of the question ask to convert into per unit and then per phase equivalent circuit. I do not understand how to do it. Please guide.

Also, how to calculate the bus1?



3. I cannot attempt because I do not know how to... what etc the first step etc
 

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Hi Pingpong
does the book (or lecturer) provide you with an equivalent circuit model?

if i remember rightly, per unit means all the component values normalised, and per phase means only consider one phase of the power lines. its been a while since i studied that.
 

FAQ: Solving Transformer Per Unit Questions

What are per unit values in transformer calculations?

Per unit values are a standardized way of representing the voltage, current, and impedance of a transformer. They are expressed as a ratio to the transformer's base values, making it easier to compare and analyze different transformers.

How do I calculate per unit values for a transformer?

To calculate per unit values, you will need to know the transformer's base values, which are typically provided by the manufacturer. You can then divide the actual values by the corresponding base values to get the per unit values.

Why is it important to use per unit values in transformer calculations?

Using per unit values allows for easier comparison and analysis of different transformers, regardless of their actual size or ratings. It also simplifies calculations and makes it easier to identify any issues or imbalances in the transformer system.

What are the benefits of using per unit values in transformer calculations?

Using per unit values allows for more efficient and accurate calculations, as well as easier data analysis and troubleshooting. It also allows for easier scaling of the system if changes need to be made in the future.

Are there any limitations to using per unit values in transformer calculations?

While per unit values are a useful tool, they do have limitations. They only provide a relative representation of the transformer's actual values, and the base values can vary between manufacturers. Additionally, they do not account for non-linear loads or losses in the system.

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