Electronic current transformers are based on Rogowski coils with small size, light weight, wide frequency band, factors that more or less affect the accuracy of the coil in the measurement operation, such as the size of the circuit conductor under test relative to the coil, and external electromagnetic interference. , The circuit under test has the advantages of large conductor volume range, no magnetic saturation phenomenon, safety and reliability, etc., and is widely used in the fields of transient high current detection and pulse power technology, actual placement, etc.
According to the working principle of the Rogowski coil, the main factors that can affect the accuracy are: the induction side (Rogowski coil), the transmission medium (air), and the power supply side (the current-carrying conductor to be measured). Among these three elements, the air conductivity of the transmission medium is air conductivity, which is much smaller than the iron core conductivity of traditional current transformers. Therefore, changes in the position and structure of the measured current-carrying conductors and Rogowski coils will affect the measurement accuracy. very sensitive. Therefore, it is necessary to analyze and study the influence of various disturbances on the accuracy of the coil. Assuming that the Rogowski coil is wound evenly, interference factors such as magnetic field, conductor position, conductor size, and external temperature need to quantitatively analyze the influence of the coil on the coil.
Assuming that the Rogowski coil is wound uniformly, according to the conceptual analysis, the influence of each influencing factor on the precision of the Rogowski coil in the work is obtained quantitatively, including: the influence of the magnetic field, the position eccentricity and inclination of the electric conductor of the measured current , The relative size of the conductor and the coil provides a certain theoretical support for the analysis and ensuring the accuracy of the Rogowski coil in specific applications. At the same time, it is known from the numerical value that the inclination of the measured electrical conductor is the most harmful to the precision of the Rogowski coil.
Therefore, when using the Rogowski coil, care should be taken to ensure that the measurement conductor is perpendicular to the Rogowski coil. Under the premise that the Rogowski coil is wound evenly, the perpendicularity between the conductor and the coil is very important.
