Transformer manufacturers must take a number of factors into account when building a transformer to ensure accuracy. Some of the factors to consider include: burden class/saturation class, temperature, load, physical configuration, rating factor, external electromagnetic fields and many more. The build of an electric transformer is simply a primary winding, secondary winding and a magnetic core. The current flows in the primary creating a current in the second winding through the magnetic core. When both of these circuits are working properly an accurate reading can be produced.
Each country has a different way of measuring current transformers, so manufacturers must pay attention to the transformers destination while building it. The two main units of measurement are IEC 60044-1 (BSEN 60044-1) and IEEE C57.13 (ANSI). It is important to ensure constant electric supply through measurements to ensure we can all carry on with our day to day lives.







