Rogowski coils: theory and experimental results.

Area of Science:

• Electrical Engineering
• Electromagnetism
• Signal Processing

Background:

• Rogowski coils are widely used for non-contact current measurement.
• Traditional analysis models the coil as a voltage source with inductive impedance.
• Understanding the coil's behavior under pulsed currents is crucial for accurate measurements.

Purpose of the Study:

• To develop and present a theoretical model for Rogowski coil voltage output when subjected to axial current pulses.
• To analyze the Rogowski coil as a delay line, offering an alternative theoretical perspective.
• To compare the results of the delay line model with the conventional voltage source model.

Main Methods:

• Theoretical analysis of Rogowski coil behavior considering it as a transmission line.
• Mathematical derivation of the voltage output based on the delay line model.
• Design and analysis of two specific Rogowski coil prototypes.
• Experimental validation of the theoretical models.

Main Results:

• The theoretical voltage output derived from the delay line model is consistent with the conventional dphi/dt voltage source model.
• The delay line approach provides an equivalent representation of the coil's inductive output impedance.
• Detailed design parameters and operational characteristics of the analyzed Rogowski coils are presented.

Conclusions:

• The delay line theory provides a valid framework for understanding Rogowski coil response to current pulses.
• The findings support the use of Rogowski coils for accurate pulsed current measurements.
• The study validates alternative theoretical approaches to Rogowski coil analysis.