# Voltage Regulation -- Transformer

• peppa
In summary, the conversation discusses a 415V to 11 kV transformer with a rating of 200 kVA. The primary winding resistance and leakage reactance are 0.014 Ω and 0.057 Ω respectively. The first part of the conversation asks to determine the % regulation at 0.8 power factor lagging, while the second part discusses designing a transformer with 2% regulation at unity power factor and a primary winding resistance of 10 mΩ. The maximum winding resistance of the secondary winding is to be found.
peppa

## Homework Statement

5. A 415V to 11 kV transformer has a rating of 200 kVA. The winding resistance and leakage reactance when referred to the primary are 0.014 Ω and 0.057 Ω respectively.

(a) Determine the % regulation of the transformer at 0.8 power factor lagging.

(b) In designing a particular 415V to 11 kV, 200 kVA transformer, the primary winding resistance is to be 10 mΩ. Find the maximum winding resistance of the secondary winding if the transformer is to have 2% regulation at unity power factor.

## The Attempt at a Solution

Attached

#### Attachments

• QUESTION 5.pdf
34.7 KB · Views: 874
I think I'm on the right track with a) but a little lost with part b)

Any help will be much appreciated

Could you please paste your work from the PDF file here into the forum window? That will make it much easier for folks to check your work and comment on it. Thank you.

## What is voltage regulation in a transformer?

Voltage regulation in a transformer refers to the ability of the transformer to maintain a constant output voltage despite fluctuations in the input voltage.

## How is voltage regulation calculated?

Voltage regulation is calculated by subtracting the no-load voltage from the full-load voltage, dividing the result by the no-load voltage, and multiplying by 100 to get a percentage.

## What factors affect voltage regulation in a transformer?

The primary factors that affect voltage regulation in a transformer include the transformer design, load current, and power factor.

## What is the ideal voltage regulation for a transformer?

The ideal voltage regulation for a transformer is 0%, which means the output voltage remains constant regardless of the input voltage or load.

## How can voltage regulation be improved in a transformer?

Voltage regulation can be improved in a transformer by using a larger core size, increasing the number of turns in the secondary winding, and using materials with lower losses in the transformer construction.

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