Improvement of the Primary Current Converter as Part of Devices Installed on the Wires of 6–10 Kv Overhead Power Lines for Electricity Metering and Relay Protection

Improving the reliability of medium voltage distribution networks (6–10
$\text{kV}$
in Russia) remains a relevant task. One of the means of improving the reliability and observability of distribution zones is equipping them with innovative compact current and voltage sensors. Automated power control and metering station (APCMS) for 6–10
$\text{kV}$
, using a Rogowski coil with a split-core design as a current sensor, have been developed in collaboration between Ivanovo State Power Engineering University (ISPU) and an industrial partner. This paper presents the construction of the current sensor, as well as its new improved version using a ferromagnetic shield. The results of simulation in the Comsol Multiphysics software and error estimation of current conversion depending on the current conductor displacement are provided. Recommendations on the material for the sensor shield are given.