24-09-2012, 01:18 PM
Gas-Insulated Switchgear for Substations
Gas-Insulated.pdf (Size: 1.09 MB / Downloads: 292)
Introduction
Common characteristic features of
switchgear installation
Because of its small size and outstanding
compatibility with the environment, SF6 -
insulated switchgear (GIS) is gaining constantly
on other types. Siemens has been
a leader in this sector from the very start.
The concept of SF6 - insulated metal-enclosed
high-voltage switchgear has proved
itself in more than 70,000 bay operating
years in over 6,000 installations in all parts
of the world. It offers the following outstanding
advantages.
Protection of the environment
The necessity to protect the environment
often makes it difficult to erect outdoor
switchgear of conventional design, whereas
buildings containing compact SF6-insulated
switchgear can almost always be
designed so that they blend well with the
surroundings.
SF6-insulated metal-enclosed switchgear
is, due to the modular system, very flexible
and can meet all requirements of configuration
given by network design and operating
conditions.
Protection against pollution
Its metal enclosure fully protects the
switchgear interior against environmental
effects such as salt deposits in coastal
regions, industrial vapors and precipitates,
as well as sandstorms. The compact
switchgear can be installed in buildings
of uncomplicated design in order to minimize
the cost of cleaning and inspection
and to make necessary repairs independent
of weather conditions.
Free choice of installation site
The small site area required for SF6-insulated
switchgear saves expensive grading
and foundation work, e.g. in permafrost
zones. Other advantages are the short
erection times and the fact that switchgear
installed indoors can be serviced regardless
of the climate or the weather.
SF6-insulated switchgear
up to 145 kV, type 8DN8
Three-phase enclosures are used for type
8DN8 switchgear in order to achieve extremely
low component dimensions. The
low bay weight ensures minimal floorloading
and eliminates the need for complex
foundations. Its compact dimensions and
low weight enable it to be installed almost
anywhere. This means that capital costs can
be reduced by using smaller buildings, or
by making use of existing ones, for instance
when medium voltage switchgear
is replaced by 145 kV GIS.
The bay ist based on a circuit-breaker
mounted on a supporting frame (Fig. 41).
A special multifunctional cross-coupling
module combines the functions of the disconnector
and earthing switch in a threeposition
switching device. It can be used as
an active busbar with integrated disconnector
and work-in-progress earthing
switch (Fig. 41/Pos. 3 and 4),
outgoing feeder module with integrated
disconnector and work-in-progress earthing
switch (Fig. 41/Pos. 5),
busbar sectionalizer with busbar earthing.
For cable termination, a cable termination
module can be equipped with either conventional
sealing ends or the latest plug-in
connectors (Fig. 41/Pos. 9). Flexible singlepole
modules are used to connect overhead
lines and transformers by using a splitting
module which links the 3-phase encapsulated
switchgear to the single pole connections.
Thanks to the compact design, up to three
completely assembled and works-tested
bays can be shipped as one transport unit.
Fast erection and commissioning on site
ensure the highest possible quality.
The feeder control and protection can be
located in a bay-integrated local control
cubicle, mounted in the front of each bay
(Fig. 42). It goes without saying that we
supply our gas-insulated switchgear with all
types of currently available bay control systems
– ranging from contactor circuit controls
to digital processor bus-capable bay
control systems, for example the modern
SICAM HV system based on serial bus
communication.
Gas-Insulated.pdf (Size: 1.09 MB / Downloads: 292)
Introduction
Common characteristic features of
switchgear installation
Because of its small size and outstanding
compatibility with the environment, SF6 -
insulated switchgear (GIS) is gaining constantly
on other types. Siemens has been
a leader in this sector from the very start.
The concept of SF6 - insulated metal-enclosed
high-voltage switchgear has proved
itself in more than 70,000 bay operating
years in over 6,000 installations in all parts
of the world. It offers the following outstanding
advantages.
Protection of the environment
The necessity to protect the environment
often makes it difficult to erect outdoor
switchgear of conventional design, whereas
buildings containing compact SF6-insulated
switchgear can almost always be
designed so that they blend well with the
surroundings.
SF6-insulated metal-enclosed switchgear
is, due to the modular system, very flexible
and can meet all requirements of configuration
given by network design and operating
conditions.
Protection against pollution
Its metal enclosure fully protects the
switchgear interior against environmental
effects such as salt deposits in coastal
regions, industrial vapors and precipitates,
as well as sandstorms. The compact
switchgear can be installed in buildings
of uncomplicated design in order to minimize
the cost of cleaning and inspection
and to make necessary repairs independent
of weather conditions.
Free choice of installation site
The small site area required for SF6-insulated
switchgear saves expensive grading
and foundation work, e.g. in permafrost
zones. Other advantages are the short
erection times and the fact that switchgear
installed indoors can be serviced regardless
of the climate or the weather.
SF6-insulated switchgear
up to 145 kV, type 8DN8
Three-phase enclosures are used for type
8DN8 switchgear in order to achieve extremely
low component dimensions. The
low bay weight ensures minimal floorloading
and eliminates the need for complex
foundations. Its compact dimensions and
low weight enable it to be installed almost
anywhere. This means that capital costs can
be reduced by using smaller buildings, or
by making use of existing ones, for instance
when medium voltage switchgear
is replaced by 145 kV GIS.
The bay ist based on a circuit-breaker
mounted on a supporting frame (Fig. 41).
A special multifunctional cross-coupling
module combines the functions of the disconnector
and earthing switch in a threeposition
switching device. It can be used as
an active busbar with integrated disconnector
and work-in-progress earthing
switch (Fig. 41/Pos. 3 and 4),
outgoing feeder module with integrated
disconnector and work-in-progress earthing
switch (Fig. 41/Pos. 5),
busbar sectionalizer with busbar earthing.
For cable termination, a cable termination
module can be equipped with either conventional
sealing ends or the latest plug-in
connectors (Fig. 41/Pos. 9). Flexible singlepole
modules are used to connect overhead
lines and transformers by using a splitting
module which links the 3-phase encapsulated
switchgear to the single pole connections.
Thanks to the compact design, up to three
completely assembled and works-tested
bays can be shipped as one transport unit.
Fast erection and commissioning on site
ensure the highest possible quality.
The feeder control and protection can be
located in a bay-integrated local control
cubicle, mounted in the front of each bay
(Fig. 42). It goes without saying that we
supply our gas-insulated switchgear with all
types of currently available bay control systems
– ranging from contactor circuit controls
to digital processor bus-capable bay
control systems, for example the modern
SICAM HV system based on serial bus
communication.