How can magnetization of the current transducer be avoided?

The residual magnetic flux (remanence) of the core varies depending on the sensor type and the magnetic material and causes an additional measurement offset, called “magnetic offset”. The value of the magnetic offset depends on the previous magnetization of the core and reaches a maximum value after the magnetic circuit is saturated.

Magnetization can occur in the following situations:

1. High overload current

2. Power supply interruption (power failure)

The offset caused by magnetization disappears in the following situations:

1. The offset caused by magnetization disappears naturally (the core recovers slowly, the speed depends on the magnetic material)

2. It is eliminated by demagnetizing the sensor, for example by appropriately reversing the primary current or using a dedicated demagnetization cycle. After demagnetization, the sensor can restore its initial performance.