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The Rogowski coil is a well-known transducer device use for its linear or large bandwidth characteristic, but it’s quite a challenge to wind a perfect Rogowski coil to minimize the current measurement error. In this paper, we will discuss the influence of different winding and positioning defects such as coil and turn tilt, turn density, and conductor positioning on current measurement. Using Sobol’s method combined with Monte Carlo method, this study aims to highlight the manufacturing defects that have the worst influence on the actual current measurement accuracy.