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Design Features

GIS technology: compact, low-life cycle cost and
modular for indoor and outdoor applications
Modular design, factory pre-assembled and tested units
Space requirement less than 20 % of comparable AIS
Safety (enclosed energized components)
Continous monitoring of SF6 densitity
Sealed for operating life > 50 years
Major inspection: not before 25 years 1)
GIS Pressure Systems
Closed pressure systems:
The closed pressure system uses isolated

apparatus compartments with o-ring

sealed bolted flanges.
The tightness characteristic of a closed

pressure system stated by the

manufacturer shall be consistent with a

minimum maintenance and inspection

philosophy.
The leakage rate from any single

compartment of GIS to atmosphere and

between compartments shall not exceed

0.5 % per year for the service life of

the equipment.*
Practical experiences to the today's

design of GIS show as low as 0.2 % per

year.