📖 ABSTRACT/OVERVIEW
This research makes theoretical and experimental contributions to the ultra-high-frequency partial discharge localisation methodology for gas-insulated switchgear, with the specific objective of developing improved techniques applicable to the 330kV GIS installations being commissioned at Nigerian Transmission Company of Nigeria substations. GIS technology offers operational and safety advantages in space-constrained urban Nigerian substation environments, but the diagnosis and localisation of insulation defects through partial discharge monitoring requires specialised UHF sensor technology and signal processing methods whose performance under the specific GIS bay geometries and electromagnetic interference environments of Nigerian substations has not been validated. The theoretical contributions include a novel electromagnetic propagation model for UHF signals in multi-bay GIS systems with typical T-junction and bus coupler configurations representing the TCN 330kV GIS standard designs; derivation of an improved time-difference-of-arrival localisation algorithm that compensates for the frequency-dependent group velocity dispersion in GIS busbars, a systematic error source not addressed by existing TDOA methods; and an original model for the impact of background interference from the adjacent TCN HVDC converter station on UHF sensor sensitivity. The experimental programme employs artificially created insulation defects, including metallic particle contamination and protrusions, in a purpose-built GIS test section to generate calibrated partial discharge sources for sensor and algorithm validation. Localisation accuracy of better than 30cm is demonstrated for defects in the tested multi-bay GIS configuration. Keywords: partial discharge, ultra-high-frequency, gas-insulated switchgear, localisation, TCN.
Need Complete Chapters of the Above Topic?
Get high-quality, Zero-AI research materials with current citations.
Request via WhatsApp 💬