Can Rogowski Coil Measure DC

Rogowski Coil cannot measure direct current. The following is a detailed explanation of this viewpoint:

measuring principle

Rogowski Coil is a current sensor based on Faraday's electromagnetic induction principle. When the primary current IP changes, it will cause a change in the induced voltage U output by the Rogowski Coil. The output voltage can be represented by the formula Vout=M di/dt, where M is the mutual inductance of the coil and di/dt is the current ratio.

Limitations of DC measurement

Although the Rogowski Coil may theoretically be able to measure DC current, in reality, it cannot reconstruct DC current due to the unknown Uout (0) at the initial state t=0. This means that the Roche coil cannot accurately measure the DC component.

Application scenarios

Rogowski Coil are mainly used to measure AC currents and have advantages such as no saturation, good linearity, and easy calibration. Due to the absence of magnetic materials, there is no issue of magnetic saturation, and the impact on the tested circuit is also minimal. However, due to the difficulty of measuring Rogowski Coil in the low current range and their susceptibility to external magnetic fields, these factors need to be taken into account when using them.

In summary, Rogowski Coil cannot be used to measure direct current, but are mainly used to measure alternating current. When choosing a current sensor, the appropriate sensor type should be selected based on the specific application scenario and requirements.