Saturation state and manufacturing method of Residual Current Sensor
The excitation current of the primary circuit of the Residual Current Sensor is very small, and it needs to work under the condition of weak magnetic field during operation. For the residual current protection appliance with rated residual operating current of 0.006A, the minimum working magnetic field strength is only about 0.080A/m. During operation, the main circuit is often subjected to several hundred amps to thousands of amps of starting current or tens of thousands of amps of short-circuit current, and the Residual Current Sensor is in extreme saturation.
The core material of the Residual Current Sensor of the Residual Current Sensor is generally an iron-nickel soft magnetic alloy material having a high initial permeability, a high maximum magnetic permeability and a low coercivity. The iron-nickel soft magnetic alloy material has extremely high initial permeability and maximum magnetic permeability, extremely low coercive force, low saturation magnetic flux density, and good temperature stability.
The core of the Residual Current Sensor is manufactured by winding into a ring and an annular punch. The material of the wound core is generally selected from a cold rolled strip having a thickness of 0.10 to 0.20 mm, and the thickness of the core of the punched core is generally 0.3 to a thickness. 1.00 cold rolled strip.www.ctsensorducer.com