Method for calibrating a Rogowski coil of fast time response.

Area of Science:

• Electrical Engineering
• Metrology

Background:

• Accurate calibration of Rogowski coils is crucial for precise current measurements, especially in applications requiring fast time response.
• Existing calibration methods may have limitations in achieving high accuracy for rapidly changing currents.

Purpose of the Study:

• To develop and validate a new, more accurate method for calibrating Rogowski coils with fast time response.
• To improve the precision of primary current calculation using the proposed calibration technique.

Main Methods:

• A modified cable pulser method was employed, relocating the voltage signal pick-off point.
• The technique relies on separating forward and reflected voltage pulses by ensuring the pulse travel time (2l/v) exceeds the forward pulse duration.
• Primary current is calculated using the formula i(t)=[u(f)(t)-u(r)(t)]/50.

Main Results:

• The proposed method allows for the direct measurement and separation of reflected voltage pulses from forward voltage pulses.
• Accurate primary current calculation is achieved by utilizing the difference between forward and reflected voltage pulses.
• The new method demonstrates enhanced accuracy in Rogowski coil calibration for fast transient events.

Conclusions:

• The developed method offers a significant improvement in the accuracy of Rogowski coil calibration, particularly for high-speed measurements.
• This technique provides a reliable approach for precisely determining primary currents in dynamic electrical systems.
• The findings contribute to advancements in electrical measurement instrumentation and metrology.