From the course: Electrical Systems: Panel Boards, Frequency Drives, and Transformers

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Isolation transformers

Isolation transformers

From the course: Electrical Systems: Panel Boards, Frequency Drives, and Transformers

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Isolation transformers

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- [Narrator] An isolation transformer is a transformer that has no physical electrical connection between the primary and secondary windings. In fact, most building distribution transformers are also isolation transformers. Usually the change in voltage and current between primary and secondary windings occurs as a result of the shared magnetic field in the core. But in some cases, there's no need to change the voltage by the transformer, just a need to provide a good electrical separation in the circuit because a component in the circuit may be creating an electrical disturbance also known as electric noise. An isolation transformer can help separate this noise from one part of the circuit to the other. Isolation transformers look just like dry-type transformers. The only difference is the coils or windings have a one-to-one ratio. Here's what this looks like. You could see the electric noise coming in on the primary side, and the output side has a perfect sign wave. The electrical…

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