Partial Discharge Analysis in HVDC Gas Insulated Substations

Nowadays, Gas Insulated Substations (GIS) are vital nodes of the Transmission Network due to their compact dimensions permitted by the use of SF6 as insulating medium and the high reliability guaranteed. Nonetheless, the strictly requirements of safety in operation and continuous power supply catalyse the attention to improve the reliability and the maintenance strategies of these installations. Though, Partial Discharge (PD) monitoring is accredited as a fundamental tool for Alternate Current (AC) GIS diagnostic, it has been little investigated for Direct Current (DC) applications. In fact, the growing demand of High Voltage Direct Current (HVDC) transmission brings up the issue of maintainability of HVDC apparatus. In this frame, this Thesis Project aims to investigate the detection and the recognition of PD under DC conditions.Intelligent Electrical Power GridsElectrical Engineering, Mathematics and Computer Scienc