How Accurate Is The Measurement of Rogowski Coil

The measurement accuracy of Rogowski coils is usually very high, but the specific accuracy is affected by various factors, including coil design, manufacturing quality, integrator performance, characteristics of the measured current, and environmental factors. The following is a detailed analysis of the measurement accuracy of Rogowski coils:

1、 Accuracy range

Generally speaking, the measurement accuracy of Rogowski coils can reach a high level. For example, some high-quality Rogowski coil sensors can achieve absolute accuracy better than 0.65% after calibration (such as Lem's RT series Rogowski coil sensors). However, it should be noted that this is only a rough range of accuracy, and actual accuracy may vary depending on specific products and application scenarios.

2、 Influencing factors

Coil design: The number of turns, shape, size, and material selection of the coil will directly affect its measurement accuracy. Optimizing design can improve the sensitivity and linearity of the coil, thereby enhancing measurement accuracy.

Manufacturing quality: Factors such as process control, material consistency, and assembly accuracy during the manufacturing process can all affect the performance and stability of the coil, thereby affecting measurement accuracy.

Performance of integrator: The integrator is an important component of the Rogowski coil measurement system, and its performance directly affects the accuracy of current waveform restoration. High precision integrators can reduce errors and improve measurement accuracy.

Characteristics of the measured current: The frequency, waveform, magnitude, and rate of change of the measured current can all affect the measurement accuracy of the Rogowski coil. For example, high-frequency current signals may be more susceptible to parasitic parameters, while low-frequency current signals may require longer integration time to accurately reconstruct the waveform.

Environmental factors such as temperature, humidity, and electromagnetic interference may also affect the measurement accuracy of Rogowski coils. Therefore, it is necessary to pay attention to environmental control during use to reduce external interference.

3、 Measures to improve accuracy

To improve the measurement accuracy of Rogowski coils, the following measures can be taken:

Optimization design: By optimizing the design parameters of the coil, such as turns, shape, size, and material selection, the sensitivity and linearity of the coil can be improved.

Improve manufacturing quality: Strengthen process control in the manufacturing process to ensure material consistency and assembly accuracy, in order to enhance the performance and stability of the coil.

Choose high-precision integrators: Use integrators with stable performance and high accuracy to reduce errors and improve measurement accuracy.

Environmental control: Pay attention to environmental control during use to reduce the impact of external factors such as temperature, humidity, and electromagnetic interference on measurement accuracy.

Calibration and Calibration: Regularly calibrate and calibrate the Rogowski coil sensor to ensure its measurement accuracy meets the requirements.

In summary, the measurement accuracy of Rogowski coils is usually very high, but the specific accuracy is affected by various factors. By optimizing design, improving manufacturing quality, selecting high-precision integrators, environmental control, and calibration and calibration measures, the measurement accuracy of Rogowski coils can be further improved.