Abstract
GIS is a switchgear, which includes the main switching and measuring equipment of the substation. In one case combined busbars, switches, disconnectors with grounding, current transformers and voltage transformers are combined. All elements of GIS are enclosed in metal shells filled with gas.
SF6 (electrical gas) – sulfur hexafluoride SF6 – chemically inert gas without color and smell, non-toxic, five times heavier than air, does not sustain combustion, is explosion-proof, has breakdown voltage 2-2.5 times higher than that of air, nitrogen and carbon dioxide, has a good arc-suppressing ability due to the active absorption of free electrons (electronegative gas).
The excellent insulating properties of the SF6 gas, which serves as an insulating medium, make it possible to achieve a high degree of compactness of GIS. This allows you to save significant usable areas for installation, which is a very important factor with limited spaces.
GIS cells, separate modules and elements allow the possibility of distributing device layout according to any schemes. KRUE cells for functional purposes are linear, bus, sectional and voltage transformers, with one or two busbar systems.
The switch module type ELK-01 Fig. 5 has two or three connecting flanges, the position and shape of which are determined by the substation scheme. Since all other modules can be connected directly, with proper planning of the project, it is possible to create very compact and, therefore, inexpensive substations. EXK-01 EXK-01 in section
Fig. 5 – KRUE type EXK-01. Modular system
The switch requires very little maintenance time, works on the auto-blow principle with one pressure stage and has one gap per pole. The arcing chamber is characterized by the sequential opening of the main and arcing contacts. The use of long-life arcing contacts and the lack of wear of the main contacts make it possible to carry out inspections and maintenance of the arcing device much less often, and in most cases to refuse them.
In the process of shutting down, the blow piston connected to the contact nozzle creates an SF6 gas flow necessary to extinguish the arc during movement. An auto-pneumatic switch piston, connected to a contact nozzle, creates an SF6 gas flow necessary to extinguish the arc while driving to shut off.
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Мосэлектро
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