Protective measures and current output of Residual Current Sensor

- Feb 23, 2019-

The Residual Current Sensor needs to effectively increase the output of the ripple current during the operation. In addition to taking other corresponding measures, the size of the cross-sectional area of the core of the transformer can also be increased. The specific core size should be based on the overall capacity of the residual current protection device. The structure, the size of the conductor of the primary circuit and the requirements for detection sensitivity are considered together.


The core of the high magnetic permeability iron-nickel soft magnetic alloy material of the Residual Current Sensor is subjected to high-temperature heat treatment after the winding or processing is completed to achieve the magnetic performance requirement. The iron core subjected to high temperature heat treatment is sensitive to mechanical stress. After being subjected to mechanical stress or impact, the magnetic properties will drop sharply and the operating characteristics will change. Therefore, adequate protection measures should be taken during the design of the transformer to prevent normal use. Affected by mechanical stress.


The magnetic properties of the amorphous alloy or ultra-microcrystalline alloy core of the Residual Current Sensor are less sensitive to mechanical stress than the iron-nickel soft magnetic alloy, but it is easily broken after aging treatment, and sufficient protective measures should be taken. . Therefore, the transformer core should generally be placed in a shell made of high-strength engineering plastic, and take appropriate anti-vibration measures, such as adding anti-vibration pads or filling anti-vibration