Underground GIS Operational in Mashhad

An underground 132/20 kilovolt gas-insulated substation was inaugurated in Mashhad, Khorosan Razavi Province, at the weekend.
“The substation is built over 1,100 square meters and is 16 meters below the surface. It cost $2 million,” head of Khorasan Regional Electricity Company Reza Riahi was quoted by IRNA.
A GIS is a high voltage substation in which the major structure is sealed with sulfur hexafluoride gas as the insulating medium. It is mostly used where real estate is expensive or not available. The technology originated in Japan where there was a substantial need to develop technology to make substations as compact as possible.