Research on the Factors Influencing the Measurement Errors of the Discrete Rogowski Coil

Abstract

An innovative array of magnetic coils (the discrete Rogowski coil—RC) with the advantages of flexible structure, miniaturization and mass producibility is investigated. First, the mutual inductance between the discrete RC and circular and rectangular conductors are calculated using the magnetic vector potential (MVP) method. The results are found to be consistent with those calculated using the finite element method, but the MVP method is simpler and more practical. Then, the influence of conductor section parameters, inclination, and eccentricity on the accuracy of the discrete RC is calculated to provide a reference. Studying the influence of an external current on the discrete RC’s interference error reveals optimal values for length, winding density, and position arrangement of the solenoids. It has also found that eccentricity and interference errors decreasing with increasing number of solenoids. Finally, a discrete RC prototype is devised and manufactured. The experimental results show consistent output characteristics, with the calculated sensitivity and mutual inductance of the discrete RC being very close to the experimental results. The influence of an external conductor on the measurement of the discrete RC is analyzed experimentally, and the results show that interference from an external current decreases with increasing distance between the external and measured conductors.

Modeling and Analyzing the Mutual Inductance of Rogowski Coils of Arbitrary Skeleton

“…It is shown in Figure 18 that the mutual inductance of the Rogowski coil of the rectangular skeleton of the right angle turns large when the primary conductor deviates from the center of the skeleton. Errors of the mutual inductance of the coils with the right-angle skeleton are also produced from the changes of the cross-section of the primary conductors [21].…”

“…According to Equation (8), mutual inductance M of the Rogowski coil with the straight primary conductor is [21] M = trueΦI…”

“…The effects of the geometrical parameters on high frequency performance of Rogowski coil are studied in [20], and the mutual inductance is also given of the Rogowski coils with the rectangular, circular and oval cross-sections and the primary conductors of the infinite length in the paper. In [21], the mutual inductance between the discrete Rogowski coils and the conductors with the circular and rectangular cross-sections is calculated by the magnetic vector potential method. The influence of the section parameters, the tilt angles, and the eccentricity of the conductors on the errors of the mutual inductance is analyzed, when their conductors are straight and of the infinite length and their shapes of the cross-sections are rectangular.…”

Using a Current Shunt for the Purpose of High-Current Pulse Measurement

“…There are many different works about Rogowski coils. Current measurements of them can be influenced by many factors ranging from their construction, the shape of the coil loop, and the location of the measured circuit in the coil loop [ 13 , 14 , 15 ]. Accurate calibration methods have been developed for Rogowski coils dedicated to pulsed power systems [ 16 , 17 ].…”

Effect of the Conductor Positioning on Low-Power Current Transformers: Inputs for the Next IEC 61869-10

“…For instance, [24][25][26][27] deal with the effect of temperature on ITs, while [28] studies the effect of moisture. Finally, electromagnetic compatibility, frequency, and positioning issues are discussed in [29][30][31][32][33][34][35].…”