Different Types of Current Transformer

Current transformers are used to protect current measuring devices from dangerous voltages running through transmission lines. They come in a variety of shapes, forms, and sizes to suit various levels of voltage and wire diameters. Here are three major types of current transformer available on the market today.

Solid Core

This is the most common yet least recommended type of current transformer consisting of a secondary coil wound on a round-shaped core and connected to the ammeter. The reason it’s not recommended is that its installation requires cutting the transmission line just to insert the device, which means additional cost and interruption in the service due to the need for opening the circuit.

Split Core

Unlike solid core current transformers, split core current transformers have an opening where the transmission line can be inserted for current measurement. This is highly advantageous because it eliminates the need to open the circuit just to install the device. However, it is due to this unique characteristic that makes measurement a bit less accurate. The cut along the core affects the result of the ammeter reading.

Rope

Rope current transformer is a type of split core transformer that is flexible and has a bigger diameter. It can be used to measure bundles of wires, large wires, and cables with irregular shape. It’s also more visually appealing than other types of current transformer. The only difference is that it requires an integrator to more efficiently transform the running voltage.