Abstract
We explain the theoretical background, uses and new development of grain-oriented silicon steel with high permeability using A1N as a grain growth inhibitor. New production techniques have made it possible to get superior core loss values; for example, 0.99 W/kg at 1.7 Tesla and 50 Hz (0.30 mm thickness). The presence of A1N precipitated being controlled in the size of about 300 Å or under and in adequate distribution and quantity in the steel is very important for developing secondary grains with high permeability. Core loss improvements on actual transformers using high permeability materials are approximately 10–25% in wound type pole transformers and 5–20% in laminated type large transformers.
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