Signal Transformer: Understanding Power Transformer Electromagnetic Interference

Learn more about how to control and identify the types of electromagnetic interference (EMI) within Power Transformers in this article by Bel Group’s Signal Transformers. Ensure successful compliance testing and build safer, better products through understanding how EMI can affect communication systems and their overall functionality.

The purpose of this document is to identify the ways through which Power Transformers conduct and radiate electromagnetic energy emissions which might cause device failures in equipment and systems containing sensitive electronic components. Various essential techniques and practical design solutions are presented here for controlling unwanted electromagnetic interference and electrical noise due to electromagnetic energy emissions in Power Transformers.

It’s better to be safe than sorry when controlling EMI in Power Transformers.

Power Transformers certainly play their role in electromagnetic (EM) energy emissions. Because of their magnetic nature, Power Transformers generate an EM field with an amplitude dependent on size, the number of winding turns, voltage and current applied to the input, the type of iron core utilized and their position within the circuit in which they are installed.

If the EM energy in Power Transformers is uncontrolled it will produce unwanted electromagnetic interference (EMI). EMI can hinder communication systems and may prevent electronic equipment from functioning efficiently. In medical devices such as diagnostic or life sustaining machines, EMI can cause false readings and or disrupt proper operation.

Mitigating radiation effects of EM fields in Power Transformers to ensure successful compliance testing, as well as better product acceptance in the marketplace, demands preventive measures be taken early on with smart design and layout strategies of the operating system.

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