Electrical Network Evolution

CERN electrical infrastructure represents a multi-layer network covering all the sites of the research centre. It has constantly evolved over the past, according to CERN needs and to the upgrade of the power utilities of the surrounding region. The first core was the power supply of Meyrin site, connected to the medium voltage grid of the city of Geneva. The network then constantly grew in accordance with the expansion of the laboratory: today CERN is connected to the high voltage utilities of the region for power delivery, and the internal distribution is done via different networks at specific voltage levels, several of them being interconnected. A general review on the electrical network was completed before the Long Shutdown 1 (LS1), based on new requirements coming from the major projects of CERN, creating an evolution program that has been running since then. The roadmap for the evolution of the electrical network is constantly updated, and it allows CERN to set the strategy for the works and upgrades to be executed in the future. The aim of this paper is to provide an overview of the evolution of the electrical network and of the roadmap for the future.