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500 kV Oil-SF6 gas Bushings Installed on SS Zapadnaya of FGC UES

The first 500 kV Oil–SF6 bushing, made under the order of FGC UES by Izolyator specialists was installed on the 500 kV Zapadnaya substation.


Federal Grid Company is the operator and manager of Russia’s unified electricity transmission grid system, including high voltage transmission lines, and holds the status of a natural monopoly. The Company’s assets include more than 139,000 km of transmission lines and 924 substations with more than 332 GVA of 35–750 kV transformer capacity. Based on the length of transmission lines and installed transformer capacity, Federal Grid is the largest publicly traded electricity transmission company in the world. Federal Grid’s business is to provide electricity transmission and technological connection services. It maintains and develops the grid system and supervises grid facilities and infrastructure in 77 Russian regions, covering a territory of 15.1 million square kilometres. Its customers are regional distribution companies, electricity suppliers and large industrial enterprises. The Company is a natural monopoly with 80.13% stake controlled by Russian Grids.

The installation was made as part of replacement program of imported bushings on 500 kV / 220 kV autotransformers of Moscow region substation with Russian made counterparts.

Such type of equipment was not produced in Russia in the past. The autotransformers at 500 kV Beskudnikovo, Ochakovo, Chagino and Kaskadnaya substations will also receive new bushings. The replacement program will continue in 2018.

Oil-SF6 gas high-voltage bushings are used on modern closed-type substations, created on SF6 insulated switchgear. The start of mass production of these bushings in Russia means the country made a step towards securing independence of domestic power industry from imported equipment supplies.

500 kV Oil-SF6 gas Bushings Installed on SS Zapadnaya of FGC UES

Source — official webpage of FGC UES PJSC