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Gas Insulated Transformer

Gas insulated transformer is a transformer which employ SF6 gas as the insulation medium.

Nomenclature of supplies products: Up to 300 kV 400 MVA,

Structural solution:

Insulation / cooling: - sulphur hexafluoride (SF6) with low / high pressure.
Solid insulation material: - mylar film, GAC film, aramid paper, plate cardboard.
Expansion tank: - not required
On-load tap changer:
- Diversion switch - vacuum interrupter
- Tap changer roller contact


Scope of application:

Free-standing substations, underground substations in urban areas, office buildings, basements of buildings. Gas insulated transformers are installed in environmentally critical areas where oil leakage is prohibited.

Advantages:

No need to construct special system of oil drains, oil receivers and oil collector;
Fire and explosion risks; SF6 gas is non-flammable. Since the rise in tank pressure for an internal fault is very small compared with the GIT tank withstand strength, the GIT tank will not explode .
Joint system of external, internal and automatic fire fighting;
Compactness and possibility to install in underground facilities, basements or ground floors: since neither a conservator nor pressure relief arrangement is required, the height of the transformer room can be reduced. For the case of 275 kV / 300 MVA class application, approximately 2 to 2.5 m. reduction in height can be achieved.
The application of GIT together with GIS does not required a fire wall between the GIT and GIS and this arrangement enables a compact substation to be achieved.
Efficiency, possibility of heat recovery from heat-transfer unit of GIT for heating up facilities;
Compliance with ecological requirements, preservation of natural landscape;
When constructing an underground substation with GI T, above ground may be used for different purposes: park area, office buildings, shops, etc.;
Cost savings in materials, construction and installation works, current maintenance and operating costs.
Version of GIT with GIS 110 kV (5 cells)


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