This standard specifies the work requirements for on-site maintenance of 1100kV gas-insulated metal-enclosed switchgear in AC UHV substation (switching) stations. This standard applies to the maintenance work of 1100kV GIS/HGIS equipment.
DL/T 311-2010 history
2011DL/T 311-2010 Guide for AC 1100kV GIS/HGIS maintenance