9 November 2006 — Siemens Power Transmission and Distribution (PTD) is replacing a 40-year-old high-voltage outdoor switching station (500/220/110 kV) in the Moscow city center with space-saving gas-insulated switchgear (GIS).
The order has a value of about €53 million. The customer, the Russian state-owned Federal Grid Company (FGC), Moscow, is taking this step to improve the reliability of the power supply. The first circuit-breakers are due to be switched in before the start of the winter 2007. Coordination of the material deliveries in the center of Moscow will be a logistical tour de force: nine 500-kV switchgear bays, 32 switchgear bays for 220 kV and six 110-kV bays have to be delivered to the right place at the right time.
By converting to gas-insulated technology, grid operator FGC will be able to expand the power supply system in the future to keep pace with the city’s growing energy requirement. The gas-insulated switchgear will be installed on the same site next to the old air-insulated system. The use of GIS technology is essential because of the restricted space available and to meet the required short installation times.