Low‐frequency performance of openable flexible double‐loop Rogowski coil

Abstract

Abstract Double‐loop Rogowski coils have become increasingly popular in the market because of their high sensitivity and flexible usage compared to their extended single‐loop coils. Due to the high number of turns (thousands) and its small turn diameter (<0.17 mm), it is very hard to draw 3D models of double‐loop coils with graphical software, let alone calculate electrical quantities by simulating them on the computer. To meet market's needs for designing high‐accuracy double‐loop coil, a method for calculating its low‐frequency coefficient of the double‐loop coil is presented. This calculation method is applicable to low‐frequency current‐carrying conductors of various geometric configurations. All experimental results verify the methods. Using this method, the errors of five typical double‐loop coils caused by three representative current‐carrying conductors are compared. The double‐loop coils are also compared with two relative single‐loop coils. These methods can quickly and accurately measure their errors of double‐loop coil with thousands of turns under different application environments. These methods are very useful for designing highly accurate double‐loop coils for a given application.

Keywords

• Measurement and error theory
• Time and frequency measurement
• Electrical instruments and techniques
• Current measurement
• Frequency measurement
• Inductors and transformers