A UHV substation made super-compact

摘要

Alstom has produced a compact version of its GIS 210 model 800 kV substation, primarily to improve environmental endurance, including resistance to seismic impact in remote locations. With its 800 kV GIS substation, Alstom aimed at combining compactness, high reliability and performance without compromising compliance with the latest IEC standards. In large countries such as India, China or Brazil, conventional and new sustainable power sources are often located in regions remote from load centres, and are connected via large-scale AC transmission systems. One solution for reducing power losses and improving the transmission capacity of AC links is to increase the system voltage to 800 or even 1200 kV AC. For these UHV transmission systems, the use of gas-insulated substations (GIS) is advantageous, as they are very reliable and requires less maintenance than air-insulated substations because all active parts are protected from environmental hazards. In addition, a GIS's inherent compactness (owing to the superior insulating properties of SF6 compared with air) reduces bay dimensions and overall substation footprint and height.