Caging Transformer: EMI Still An Important Design Issue

Traditionally, little regulatory pressure is applied to reduce these emissions, but that picture now is beginning to change. Sensitive telecommunication systems and vital medical measuring and monitoring equipment rely heavily on electronics, which makes them more susceptible to disruption by EMI. Fortunately, emissions from transformers and power supplies can be reduced to acceptable levels.

Electromagnetic radiation is produced in varying degrees by virtually every type of electrical and electronic component. Even wire and cable, though passive, can become active radiators of electromagnetic energy if poorly constructed or improperly integrated into the equipment. Thus, it should come as no surprise that power transformers, which handle high voltages and currents and produce strong electromagnetic fields, have the ability to deliver energy into the surrounding environment.