MIDDLE-SET SWITCHGEAR AC METAL ENCLOSED LOOPED NETWORK SWITCHGEAR HIGH VOLTAGE RING NETWORK FRAME HIGH-VOLTAGE LOAD SWITCH AC METAL ENCLOSED SULFUR HEXAFLUORIDE RING NETWORK SWITCH GE MOVEABLE METAL-ENCLOSED AC SWITCHGEAR BOX TYPE TRANSFORMER SUBSTATION TRANSFORMER STATION RESIN INSULATED DRY TYPE TRANSFORMER UPPER VACUUM CIRCUIT BREAKER WITH SEGREGATION COLUMN