Design of Shield Ring for UHV-class Gas-insulated Switchgear Spacer with Built-in Rogowski Coil based on Electromagnetic Interference Analysis

The main goal of this paper is to design the shield ring for the Rogowski coil embedded in the UHV-class gas-insulated switchgear (GIS) spacer. Because the UHV-class GIS spacer holds the individual conducting wires adjacent, the Rogowski coil can be affected by electromagnetic interference from adjacent large sinusoidal currents. The purpose of a shield ring eliminates electromagnetic interference caused by adjacent sinusoidal currents so that the Rogowski coil can operate normally. We designed shield rings considering the material and geometry to reduce the electromagnetic influence from adjacent currents. Finally, we evaluated and compared the performances of shield rings in terms of material and geometry. Three dimensional (3-D) finite element analysis (FEA) was used to analyze the electromagnetic effects of the Rogowski coil.