Development and Research of the Rogowsky Coil Design with Low Sensitivity to Conductor Displacement

The Russian energy sector underwent significant changes at the end of the 20th and the beginning of the 21st century [1]. The rapid development of engineering and technology in Russia inevitably led to a constant increase in the power system capacity, which in turn led to an increase in the levels of short circuit (SC) currents. Under such conditions, the problems of ensuring static and dynamic stability, the development of automatic emergency control (AEC) systems and the creation of new types of relay protection and automation systems (RPA) have become priority issues for the development of the electric power industry [2]. In particular, recently one of the most important issues is the creation of more advanced current sensors based on non-traditional primary converters [3–7]. A huge breakthrough in solving the tasks was made thanks to the development of computer technology. Electromagnetic and static relays were replaced by microprocessor technologies, the main advantage of which is a high-resistance input, which allows to use previously inaccessible low-power devices. One of these devices is the Rogowski coil, which is one of the types of nontraditional primary current converters. The disadvantage of the split Rogowski coil is the dependence of the metrological characteristics of the transducer on the position of the conductor. This article is devoted to the development of methods for reducing this dependence.