23-04-2010, 02:43 PM
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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.
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.
