Manufacturing method of residual current transformer core

There are two manufacturing methods for the core of residual current transformer: winding into a ring and ring-shaped punching. The material of the winding core is generally cold-rolled strip with a thickness of 0.10～0.20mm, and the material of the punching core is generally selected with a thickness of 0.3～1.00. Cold rolled strip. In addition to iron-nickel soft magnetic alloys, there are also amorphous or ultra-microcrystalline soft magnetic alloy materials used to manufacture residual current transformer cores. Amorphous and ultrafine crystalline soft magnetic alloys have the advantages of simple manufacturing process and heat treatment process, low cost, high maximum permeability and saturation magnetic flux density, etc., but the initial permeability is low, which is not suitable for starting Residual current protection appliances that require high magnetic permeability and sensitivity are used, for example, electromagnetic residual current protection appliances. In addition, amorphous and ultra-microcrystalline materials have defects such as brittle texture and fragility, so appropriate protection measures should be considered in the design.