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Magnetic alloys used in the current transformers are classified into four main categories:
1. Silicon Steel – The most commonly used magnetic alloy for the cores of electrical transformers because of its cost-effectiveness and electrical resistance properties, which help to efficiently reduce eddy current losses.
2. Nickel Iron Alloys (Permalloy) – Offering high permeability and low coercivity, Permalloy is used in applications requiring high sensitivity and minimal core losses at low magnetizing forces.
3. Cobalt Iron Alloys – They provide higher saturation induction than silicon steel and Permalloy, which makes them suitable for high performance applications where size and weight are critical factors.
4. Amorphous Steel – Known for having extremely low losses, amorphous steel is used in electricity distribution transformers where energy saving is a priority, despite its higher cost and brittle nature.
These classifications allow engineers and designers to choose the most appropriate magnetic alloy for the specific requirements of current transformers in various applications.
a
Explanation: The magnetic alloys used in the current transformers are divided into 3
types. They are hot rolled silicon steel, cold rolled grain oriented silicon steel and nickel
iron alloys