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Isolation Transformer:

Transformers with primary (input) and secondary (output) windings separated from each other are known as isolation transformers. Under this construction, the input power and the output power are electrically separated by an dielectric insulation barrier.

Advantages of using an isolation transformer

• The primary and secondary winding can be constructed as a step-up or step-down transformer to match the load in the electrical system
• Preventing the equipment from getting spikes and harmonics from the mains
• Safety. There will be no conductive connection between the live part of the circuit and earth. With the isolating transformer, there is no danger in touching the live while the body is earthed.
• By connecting the electrical system safety ground to the neutral conductor on the transformer secondary, it eliminates neutral-to-ground voltage and noise. This resolves reliability problems for microprocessor-based electronics.
Isolating transformers are also the most common kind of transformers for voltage step-up and step-down usage.However, 1:1 ratio transformers, where input and output voltage are the same, are also widely used to solely take advantage of the isolation.