If your facility uses three phase power, you might have special needs and choosing the best 3 phase transformers for the job is very important. For example, you may need to install an isolation transformer or an autotransformer and sometimes this decision isn’t easy. Let’s explore the similarities and differences of these two transformers, to help you decide.
Isolation Transformer
An isolation transformer is used when you need the main power source separate or isolated from the load. It still requires three phase power but there could be several reasons to use separate 3 phase transformers. For example, you may wish to guard against electrical shock hazards or perhaps you need noise suppression.
Inside a typical transformer, the coils are located near each other and they have separate magnetic cores. A three phase isolation transformer has three primary and three secondary coils and both primary and secondary coils share the same core. In addition, the coils are all insulated from each other.
Isolation transformers can block DC signals while allowing AC signals to pass through. Some have EMI shields to protect sensitive electronics like medical equipment and computers.
Autotransformers
Autotransformers do not require separate coils or cores. For example, single phase autotransformers only need one set of coil windings (primary and secondary). On the other hand, 3 phase transformers configured as autotransformers would require only three sets of coils, instead of the standard 6 sets.
An autotransformer can have adjustable voltages and they are much lighter and smaller than isolation transformers. They are also cheaper but they do not protect against shock hazards and can’t effectively isolate circuits.
Which One is Right?
It’s important to examine all your needs before selecting a transformer. To make sure you get it right the first time, visit transformer specialists. They help you make the right choice and can create custom transformers for your needs.
