A shielded transformer, also known as a shielded isolation transformer, is a type of transformer that incorporates shielding to provide additional protection against electromagnetic interference (EMI) and radio frequency interference (RFI). The shielding is designed to reduce the transfer of electrical noise between the primary and secondary windings of the transformer, improving the overall performance and reducing the impact of external electromagnetic fields.
Here are some key features and benefits of shielded transformers:
- Electromagnetic Interference (EMI) Reduction: The primary purpose of shielding in a transformer is to minimize the impact of electromagnetic interference. The shield helps contain and block external electromagnetic fields from entering the transformer, reducing the potential for noise to be induced in the secondary winding.
- Radio Frequency Interference (RFI) Reduction: Shielding also helps reduce radio frequency interference, which can affect sensitive electronic equipment and communication systems.
- Improved Signal Integrity: Shielded transformers are particularly beneficial in applications where signal integrity is crucial. They help maintain clean and stable power delivery to sensitive electronic circuits.
- Noise Mitigation: By reducing noise and interference, shielded transformers contribute to better overall performance of connected equipment, resulting in improved efficiency and reliability.
- Safety and Compliance: Shielding can also provide an additional level of safety by preventing unwanted coupling of electrical signals and reducing the risk of electrical hazards.
- Critical Applications: Shielded transformers are commonly used in environments where precise signal transmission, low noise levels, and high immunity to interference are essential. Examples include medical equipment, laboratory instruments, telecommunications systems, and industrial control systems.
- Sensitive Electronics: These transformers are suitable for applications involving sensitive electronics, such as microprocessors, sensors, communication devices, and data acquisition systems.
- Customization: Shielded transformers can often be customized to meet specific voltage, power, and shielding requirements of various applications.
- Multiple Winding Configurations: Shielded transformers can be designed with various winding configurations, such as single-phase, three-phase, or even specialized configurations for specific applications.
- Installation: Proper installation is important to ensure the effectiveness of the shielding. Grounding the shield correctly helps divert external interference away from the transformer.
It’s important to note that while shielded transformers offer benefits in terms of noise reduction and interference mitigation, they may also come at a higher cost compared to non-shielded transformers. When considering the use of shielded transformers for your application, consulting with electrical engineers or professionals experienced in electromagnetic compatibility can help you make informed decisions and select the right transformer to meet your specific requirements.