For many applications, devices and equipment, the use of 3 phase transformers over single transformers make them the best possible option. The smaller size, the ability to include over-current prevention in the design as well as the easier installation for most applications are just some of the reasons these transformers are so widely used.
Follow the Code(s)
One of the most critical considerations when designing a three phase or a single-phase transformer is to ensure all applicable electrical codes are followed. There are specific requirements as outlined in the National Electrical Code to be used in these transformers when used in motors, circuits, and controllers.
In addition, building codes and other requirements for the specifics of the design may be required. It will also be essential to consider other requirements in different countries if the equipment, devices or parts as to be exported for sale or use internationally.
Transformers can be designed to be oil-filled or inert-gas systems. They can also be smaller systems or large system at are known as dry-type transformers, which are typically not used in the largest applications, such as power plants and other municipal systems. However, these 3 phase transformers are often found in smaller systems and in many different motors and equipment models in all industries.
Considering the operating environment including heat, cold and exposure to water, vibrations, shock and other potential issues that may damage the system. Different types of cores, core configurations and even housings for the transformers can be designed to address these issues.
Keep in mind that if one of the transformers in 3 phase transformers is damaged or has a fault, the entire unit will need to be repaired. It is not possible to simply bypass one of the phases due to the windings and the internal configuration of the transformer.
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