What is the purpose of a tap changer in a transformer?

What is the purpose of a tap changer in a transformer?

Step 1: Understand that a transformer is a device that changes electrical voltage levels.
Step 2: Know that sometimes the voltage coming into the transformer needs to be adjusted to get the right output voltage.
Step 3: Learn that a tap changer is a mechanism in the transformer that allows for this adjustment.
Step 4: Realize that by changing the taps (connections) on the transformer, the voltage ratio can be modified.
Step 5: Conclude that the main purpose of a tap changer is to keep the output voltage stable and at the desired level.

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