As cities grow, so does their hunger for electrical power. To achieve the necessary bulk transmission, the highest voltage level of a city’s power supply is continuously changing: from 110 kV to 220 kV, even reaching 500 kV in some mega-cities in China and other countries. This calls for extra-high-voltage (EHV) substations to act as load hubs in the city. However, such developments lead to a conflict between substation footprint and power requirement. In general, the higher the voltage level, the more power a substation handles and the larger the area it needs. Such demands, however, conflict with typical limitations that are prevalent in city areas. The shortage of land is the most important among these and the huge investment cost is also a very serious challenge. Furthermore, as an energy distribution center for very many people, such a substation must perform with high reliability and availability. All this underpins the case for a compact substation, featuring reduced customer costs and a smaller footprint while maintaining high availability.
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