What is the material used in the transformer when the transformer errors should be small?

In transformers where errors need to be minimized, especially in precision applications such as measurement and instrumentation transformers, the core material plays a critical role. The material used in such transformers is typically high-grade silicon steel, known for its excellent magnetic properties. This material reduces hysteresis and eddy current losses, which are critical for minimizing errors. Silicon steel cores can be further optimized by laminating them, which significantly reduces eddy current losses, further improving the transformer’s efficiency and accuracy. Additionally, some specialized transformers might use amorphous steel or nanocrystalline materials for even lower losses and higher precision.