HIGHLY ACCURATE ROGOWSKI COIL SENSORS

摘要

After calibration, the new RT series of coil sensors achieves an absolute accuracy of better than 0.65%-including the position error-making them the first split-core Rogowski coils to be suitable for use in Class 1 power devices An imperfect coil structure induces an unbalanced geometry and increases sensitivity to the position of the measured conductor within the sensor or to the proximity of external electric cables. The RT series of sensors overcomes the problem of asymmetry resulting from discontinuity at the sensor opening, which is inherent in conventional split-core Rogowski coils. LEM engineers have Invented a unique, patent-pending magnetic coupling technology that allows a perfect extension of the magnetic flux at the loop opening that compensates for coil asymmetry. In addition, an advanced coil-winding process produces exceptionally regular windings to further enhance sensor symmetry, accuracy, and immunity to electromagnetic interference.