A Focus on Split Core Current Transformers

Transformers are useful devices that transfer energy between two or more circuits by employing electromagnetic induction. They also come in the form of laminated core, toroidal, auto, variable, and others that are designed to serve specific functions. One of these specialized types of energy transfer devices is the split core current transformer.

Just like other types of transformers, the split core variety measures alternating current that flows through conductors, but comes with a distinguishing feature: its design. Unlike common transformers that come in a toroidal coil, the design of a split core current transformer allows it to be assembled around a buss bar without the need to disconnect the buss bar. For this unique feature, the split core type employ C-cores and U-core structures because they are built for easy dismantling and reconstruction, thereby saving time and energy.

Split core current transformers are commonly used for lower frequency applications and normally employ grain oriented silicon steel for the metal core. This type of transformer can also use nickel alloys and more exotic materials for a core to ensure less core loss at higher frequencies (typically up to about 10 kilohertz). Despite its low frequency application, the lower core loss factor makes split core types suitable for high accuracy current transformers.