Gas-insulated switchgear
up to 145 kV, 40 kA, 3150 A
type series 8DN8
Answers for energy.
Connecting environment-friendly wind
energy to the grid with compact 8DN8 GIS
in switchgear building
Benefiting from experience
Bay control systems in ergonomically
arranged local control cabinet
8DN8 switchgear up to 145 kV,
outgoing cable bay
Our 8D series of gas-insulated switchgear represents
a highly successful product concept.
Since its introduction in 1968, Siemens has installed
more than 24,000 bays worldwide. A total of well
over 285,000 years of bay operation have since been
recorded.
Intensive research work, many years of system
experience, and continuous further development of
the first system types have ultimately led to today’s
generation of gas-insulated, metal-enclosed
switchgear – a world leader when it comes to
economic efficiency
high reliability
long service life
safe encapsulation
very high degree of gas-tightness
low life cycle and maintenance costs
easy access and ergonomic design
high availability
reliable operation even under extreme
environmental conditions
2 Siemens AG, Energy Sector, gas-insulated switchgear type series 8DN8
Area required
110
100
[%]
90
80
70
60
50
40
30
20
10
0
1968 Year 2009
Continuous further development has reduced the footprint required for 145-kV GIS
to only 25% of the first designs in 1968
Our type series 8DN8 switchgear for all voltage levels from 72.5 kV to 145 kV represents one of the
most compact systems of its kind available worldwide, and meets all of today’s requirements for modern, pioneering switchgear in terms of efficiency and
economy. Its space-saving design and its low weight
help make this switchgear extremely economical.
Since the levels of noise and field emission (EMC)
are extremely low, it is possible to easily integrate
8DN8 switchgear even in sensitive environments,
residential quarters, and city centers. They feature
high energy efficiency over the entire process
chain – from production and commissioning to
re cycling – and meets all current requirements for
environmentally compatible high-voltage switchgear.
8DN8 switchgear for 72.5 kV single
busbar arrangement
Switchgear type series 8DN8 145 kV combines technical expertise with all standards and advantages of
the Siemens 8D type series. It also offers a number
of distinct advantages:
Rapid availability thanks to time-saving delivery
and installation concepts
Independence from atmospheric and external
influences
Suitability for indoor and outdoor installation
Convincingly space-saving system configurations
(e.g. H configuration, 1½ breaker, ring, etc.)
High flexibility of switchgear arrangement for
optimized system management
Adaptable to all predecessor models of the same
voltage level
Switchgear type series 8DN8 72.5 kV corresponds to
switchgear 8DN8 145 kV with regard to construction
and technical design but it is significantly smaller.
The extremely small component dimensions allow it
to be deployed wherever space is at a premium.
3Siemens AG, Energy Sector, gas-insulated switchgear type series 8DN8
The 8DN8 allows a high degree of versatility in
switchgear layout thanks to its modular construction
The innovative design of the cast resin bushings allows
maximum flexibility in the design of bays and for installation
and service work
Flexible due to modular design
A fundamental feature of our gas-insulated switchgear is the high degree of versatility made possible
by its modular system. Depending on their respective functions, the components are housed either
individually and/or combined in pressure-resistant,
gas-tight enclosures. With a remarkably small number of active and passive modules, all customary
bus schemes are possible. Standard adapters
ensure compatibility with all predecessor models of
the same voltage level.
Three-phase enclosures are used for type series
8DN8 switchgear in order to achieve extremely low
com ponent dimensions. This concept allows a very
compact design with minimum space requirement.
The ergonomic modular principle makes for easy
access to control elements.
Aluminum is used for the enclosure. This guarantees
freedom from corrosion and ensures lightweight
equipment. The use of modern construction
methods and casting techniques makes it possible to
optimize the enclosure’s dielectric and mechanical
characteristics. The low bay weight ensures minimal
floor loading and eliminates the need for complex
foundations.
All the modules are connected to one another by
means of flanges. The gas-tightness of the flange
connections is assured by O-ring seals that have
been proven in operation since 1968.
Temperature-related changes in the length of
conductors are compensated by coupling contacts.
Where necessary, the joints are accessible via
openings sealed with gas-tight covers. Sulfur
hexafluoride (SF
) is used as the insulating and
6
arc-quenching medium. It is contained in an
extremely gas-tight enclosure so that it cannot
pollute the environment.
Gas-tight bushings allow subdivision of the bay
into a number of separate gas compartments, each
of which is provided with its own gas monitoring
equipment. The static filters in the gas compartments absorb moisture and decomposition products.
The use of rupture diaphragms reliably prevents
shattering of the enclosure in the case of buildup of
abnormally high pressure. Diverter nozzles on the
rupture diaphragms ensure that the gas is expelled
in a defined direction in the event of bursting,
thus ensuring that the operating personnel are not
endangered.
4 Siemens AG, Energy Sector, gas-insulated switchgear type series 8DN8
Three-phase enclosure allows compact design:
8ND8 145 kV, cable bay with double busbar
7
1
2
3
4
5
6
8
9
10
11
1. Integrated local control cubicle
2. Support for control cubicle
3. Current transformer
4. Busbar II with disconnector and
earthing switch
5. Interrupter unit of the circuit-breaker
6. Busbar I with disconnector and
earthing switch
7. Stored-energy spring mechanism
with circuit-breaker control unit
8. Voltage transformer
9. High-speed earthing switch
10. Outgoing feeder module with
disconnector and earthing switch
11. Cable sealing end
Variations are possible with switchgear type series 72.5 kV
Siemens AG, Energy Sector, gas-insulated switchgear type series 8DN8
5
Circuit-breaker module
The central element of the gas-insulated switchgear
is the three-pole encapsulated circuit breaker
comprising the following two main components:
interrupter unit
operating mechanism
The design of the interrupter unit and of the storedenergy spring mechanism is based on proven and in
most cases identical designs which have often been
used for outdoor switchgear installations world wide.
3
4
5
6
7
1. Trip coil CLOSE
2. Cam plate
3. Corner gears
4. Connecting rod
5. Connecting rod for closing
spring
6. Connecting rod for opening
spring
7. Closing spring
8. Emergency hand crank
Circuit-breaker module
1
2
9. Charging gear
10. Charging shaft
11. Roller lever
12. Damper (for closing)
13. Operating shaft
14. Damper (for opening)
15. Trip coil OPEN
16. Drive mechanism housing
17. Opening spring
10
11
12
13
14
15
16
17
Operating mechanism
The stored-energy spring mechanism provides the
8
9
force for opening and closing the circuit-breaker.
It is installed in a compact corrosion-free aluminum
housing. The closing spring and the opening spring
are arranged in order to ensure good visibility within
the drive unit. The entire drive unit is completely
isolated from the SF
gas compartments. Roller
6
bearings and a maintenance-free spring mechanism
ensure decades of reliable operation.
Proven design principles of Siemens circuit-breakers
are used, such as vibration-isolated latches and
load-free isolation of the charging mechanism. The
operating mechanism offers the following
advantages:
defined switching position which is securely main-
tained even if the auxiliary power supply fails
tripping is possible irrespective of the status of the
closing spring
high number of mechanical operations
low number of mechanical parts
compact design
choice of single-pole or common drive design.
The single-pole version allows single-pole automatic reclosing.
Siemens AG, Energy Sector, gas-insulated switchgear type series 8DN8
6
Variations are possible with switchgear type series 72.5 kV
Interrupter unit
The interrupter unit used in the circuit-breaker for
arc quenching operates on the proven self-compression principle. Since this requires only minimal
operating energy the mechanical stresses involved
are low. Stressing of both the circuit-breaker and
the housing is reduced.
The current path
In the case of a self-compression circuit-breaker, the
current path is formed by the contact support (1),
the base (6), and the moving contact cylinder (5).
In the closed position, the operating current flows
through the contact finger (3) and the arcing contact (4) which is also closed.
Arc-quenching principle
Interruption of operating current
During the breaking operation, the contact finger
(3) opens first and the current continues to flow via
the arcing contact (4), which is still closed. This prevents erosion of the main contacts. As the breaking
operation progresses, the arcing contacts (4) open
and an arc develops between them. Simultaneously,
the contact cylinder (5) moves into the compression
volume (6) and compresses the remaining arcquenching gas. The compressed arc-quenching gas
flows through the contact cylinder (5) into the contact gap and extinguishes the arc.
Interruption of fault currents
If the short-circuit current is high, the arc-quenching
gas at the arcing contact is heated considerably by
the arc’s energy. This leads to a strong, additional
rise in the pressure in the contact cylinder and builds
up the necessary arc-quenching energy. Consequently, this energy does not have to be supplied by
the operating mechanism. As the switching operation progresses, the fixed arcing contact releases the
outflow from the nozzle (2). The gas now flows out
of the contact cylinder and through the nozzle, thus
extinguishing the arc.
Breaker in
“On” position
Breaking: arcing
contact open
Breaking: main
contact open
Breaker in
“Off” position
1. Contact support
2. Nozzle
3. Contact finger
4. Arcing contact
5. Contact cylinder
6. Base
7Siemens AG, Energy Sector, gas-insulated switchgear type series 8DN8
Three-position switching device
Schematic diagram
Neutral position
Disconnector closed
Earthing switch closed
The functions of a disconnecting switch and an
earthing switch are combined in a three-position
switching device.
The moving contact either closes the gap or
connects the high-voltage conductor to the mating
contact of the earthing switch. Integral mutual interlocking of the two functions is achieved as a result
of this design, thus eliminating the need for providing corresponding electrical interlocking. An
in sulated connection to the mating contact of the
earthing switch is provided outside the enclosure for
test purposes. In the third, neutral position, neither
the disconnector contact nor the earthing switch
contact is closed. The three poles of a bay are mutually coupled and all three poles are operated at once
by a motor drive. Force is transmitted into the enclosure via gas-tight rotating shaft glands. The alarm
switches and the on/off indicators are friction-locked
and are connected directly to the drive shaft. Manual
emergency operation is possible. The en closure
can be provided with generously sized view ports,
through which the switching position of all three
phases is visible.
The three-position switching device is contained in a
number of different modules:
Outgoing feeder module:
voltage transformer
downstream of the
disconnecting switch
Outgoing feeder module:
voltage transformer
upstream of the
disconnecting switch
Busbar module
Outgoing feeder module
The outgoing feeder module connects the basic bay
with various termination modules (for cable termination, overhead line termination, and transformer
termination). It contains a three-position switching
device, which combines the functions of an outgoing feeder disconnector and of a bay-side earthing
switch (work-in-progress type). Installation of a
high-speed earthing switch and of a voltage transformer is also possible where required. The highvoltage site testing equipment is generally connected to this module.
Busbar module
Connections between the bays are effected by
means of busbars. The busbars of each bay are
enclosed. Adjacent busbar modules are coupled by
means of expansion joints. The module contains a
three-position switching device, which combines
the functions of a busbar disconnecting switch and
of a bay-side earthing switch (work-in-progress
type).
The busbar can also be of the passive type.
Bus sectionalizers
Bus sectionalizer
8 Siemens AG, Energy Sector, gas-insulated switchgear type series 8DN8
Bus sectionalizers are used for isolating the busbar
sections of a substation. They are integrated in the
busbar in the same manner as a busbar module. The
module contains a three-position switching device
which combines the functions of a bus sectionalizer
and of an earthing switch (work-in-progress type).
Variations are possible with switchgear type series 72.5 kV
High-speed earthing switch
The high-speed earthing switch used is of the socalled “pin-type.” In this type of switch, the earthing
pin at earth potential is pushed into the tulip-shaped
mating contact. The earthing switch is equipped
with a spring-operated mechanism, charged by an
electric motor.
Instrument transformers
Current and voltage transformers are used for
measuring, protection, and monitoring purposes and
can be integrated at any point within the substation.
The secondary connections are led out of the enclosure through gas-tight bushings and brought into
contact with terminals. They are supplied in a number of variants – ranging from conventional instrument transformers of different classes and standards
to advanced current and voltage sensors.
High-speed earthing
switch
Current transformer
As a general rule, conventional induction type
current transformers are used which are individually
matched to the different requirements of measurement and protection systems. The high-voltage
conductor forms the primary winding. The individual
cores with the secondary windings constitute independent measurement circuits. Changeover to a
different transformation ratio is possible by means
of secondary-side tab connections. The current
transformer should preferably be arranged in the
bay directly downstream of the circuit-breaker.
Voltage transformer/voltage divider
Conventional induction type voltage transformers,
which are individually matched to the different
requirements of measurement and protection systems, are predominantly used. Voltage transformers
should preferably be provided on the busbar and in
the outgoing circuit. Optional insulating clearances
at the primary terminal enable the transformer to
be switched on and off in the high-voltage test.
Voltage transformers of the “Power VT” design
provide a convenient interface for carrying out highvoltage tests effortlessly, not only during commissioning but also over the entire life cycle of a GIS
system, for example after expansions.
Short current
transformer
Long current
transformer
Conventional voltage
transformer / Power VT
R/C voltage dividers are designed to match advanced
digital measurement and protection systems. They
map high voltage in linear form over a wide frequency range and are therefore suitable, for example, for
monitoring voltage quality, especially for networks
in which semiconductor technologies are used to an
increasing extent.
Variations are possible with switchgear type series 72.5 kV
R/C voltage divider
Siemens AG, Energy Sector, gas-insulated switchgear type series 8DN8
9
Connection modules
Connection modules join system components within
a bay. They are also used for pipework penetrations
and form the connection between switchgear
components situated far apart. They also provide a
means of connecting equipment such as transformers or overhead lines located some distance away.
Both single-pole and three-pole encapsulated connection modules are available depending on the
circuit and the spatial layout of the bay.
Three-pole extension
module
Design variants of T-modules
Three-pole 90° angular
module
Design variants of single-pole
angular modules
Single-pole extension module
Extension modules
Extension modules connect switchgear components
that are a long way away from each other in a
straight line.
T-modules
T-modules are used as branch-off points or for
attaching a surge arrester, voltage transformer,
earthing switch, or outgoing feeder module. Their
basic design is always the same in every version.
Angular modules
Angular modules are used for splitting the conductors in outgoing leads. They are available in designs
with angles of 30°, 45°, 60°, and 90°. With the threepole 90° module it is also possible to implement
offset system designs and long outgoing leads.
Splitting module, single-pole/three-pole
Splitting modules are used for connecting three-pole
switchgear components to single-pole components.
As a rule, they form the connection between the
outgoing feeder module and various termination
modules (for example, overhead line termination,
transformer termination).
Splitting module
Surge arrester
10 Siemens AG, Energy Sector, gas-insulated switchgear type series 8DN8
Surge arrester
If required, encapsulated surge arresters can be
connected directly. They serve to limit overvoltages
that may occur. Their active part consists of metaloxide re sistors with strongly non-linear current/
voltage characteristics. The arrester is generally
flange-jointed to the switchgear via a gas-tight
bushing. The arrester housing incorporates an inspection hole, through which the internal conductor
can be accessed for inspection purposes. There are
connections for gas monitoring and arrester testing
on the underside.
Variations are possible with switchgear type series 72.5 kV
Termination modules
The termination modules connect the bays of the
gas-insulated switchgear to the following items of
equipment:
overhead line
transformer or reactor
cable
They thus form the transition between the SF
gas
6
insulation within the enclosure and other insulating
media.
Cable termination
This three-pole module links the metal-enclosed gasinsulated switchgear with the high-voltage cables.
All customary types of high-voltage cables can be
connected without problem via conventional cable
sealing ends or plug-in types. The primary conductor
between the cable sealing end and the switchgear
can be removed in the neighboring outgoing feeder
module to perform a high-voltage withstand test.
/air termination
SF
6
The single-pole SF
/air termination module forms
6
the transition from the gas-insulated switchgear to
air-insulated components or overhead lines. This
termination is a combination of single-pole connection modules and an outdoor/SF
bushing. Length,
6
shed form, and creepage distance of the outdoor/SF
bushing are determined in line with insulation coordination, minimum clearance, and degree of pollution. The outdoor termination module is suitable for
air-insulated connections between GIS and
Example: cable termination
(plug-in type)
Example: cable termination
(conventional type)
6
Example: cable termination
(conventional type) with
disconnector/earthing switch
overhead lines
outdoor bushings of outdoor transformers or
reactors
outdoor sealing ends of high-voltage cables.
The splitting of the connection points for the three
phases with the necessary clearance in air for conductor insulation is taken into account in the design
of the switchgear.
Transformer tube-termination
Similar to the outdoor termination module, the
single-pole transformer termination module is
connected to the three-phase encapsulated basic
bay via a combination of connection modules. It
effects the transition from the GIS directly to the
bushing of oil-insulated transformers or re actors.
The transformer bushing must be oiltight and resistant to gas pressure. Temperature-related movements and non-uniform settling of the switchgear
and transformer foundations are absorbed by expansion joints.
/air termination
SF
6
Transformer tube-termination
Variations are possible with switchgear type series 72.5 kV
11Siemens AG, Energy Sector, gas-insulated switchgear type series 8DN8
Left:
stored-energy spring
mechanism of the
circuit-breaker
Right:
integrated local control
cubicle with bay
controller
Control and monitoring –
consistent and flexible control and protection
Proven switchgear control
All the elements for the auxiliary and control circuits
are accommodated in a decentralized arrangement
in the high-voltage switching devices. The complete
drive mechanisms for the switchgear are factorytested. Only tried and tested Siemens technology is
used in the auxiliary and control circuits.
Switchgear is usually supplied complete with bayinternal cabling, for example all the way to the integrated local control cubicle. This minimizes the time
required for installation and commissioning and
reduces the possibilities of error.
Additional sensors and interfaces can be provided
optionally for diagnostics systems or modules for
permanent monitoring of the precise current data
condition.
Gas monitoring
Each switchgear bay is divided into a number of
gas compartments. These gas compartments are
constantly monitored by means of density monitors
with integrated indicators; any deviations are indicated as soon as they reach the defined response
threshold. The optionally available density sensors
allow remote indication and further processing of
the current measured value for each gas compartment in digital control and protection systems.
Flexible and reliable control and protection
system
Control and feeder protection are generally accommodated in the local control cubicle, which is itself
integrated in the operating panel of the switchgear
bay. This reduces the amount of space needed and
the time required for commissioning. Alternatively,
a version of the local control cubicle for installation
separate from the switchgear is available as a flexible
solution for meeting different requirements with
respect to the arrangement of the control and protection components. The cabling between the local control cubicle and the high-voltage switching de vices is
effected via coded plugs, which minimizes both the
installation cost and the risk of cabling errors.
Of course, type series 8DN8 switchgear is available
on request with any commonly available bay and
substation control and protection systems as well as
uniform systems to meet your individual requirements. Standard interfaces in the switchgear control
allow interfacing of
conventional control systems with protective
interlocking and control panel
digital control systems with user-friendly bay
controllers and substation auto mation with
PC operator station (HMI)
intelligent, fully networked digital control and
protection systems with supplementary monitoring and remote diagnostic functions.
12
Siemens AG, Energy Sector, gas-insulated switchgear type series 8DN8
The wide range of Siemens control and protection
systems enables us to provide customized concepts
from a single source.
Left:
high-voltage test on
site with “Power VT”
Right:
8DN8 switchgear
offers maximum
flexibility for all
aspects of transport
Transport, installation, commissioning,
operation, and maintenance
Transport
The 8DN8 is optimized for transport and on-site
installation. Thanks to the compact dimensions of
the 8DN8 it can be shipped in standard containers
and by road, and is transported in the largest possible units that are still easy to handle. It is thus
possible to dispatch up to six single or three double
switchgear bays, completely assembled and tested,
as a single transport unit. In transport units containing switching devices, all operating mechanism
attachments are preset at the factory prior to shipment. All flanges, where the modules are to be
joined to other equipment, are pro tected against
corrosion and sealed with transport covers. All items
are packed according to the specific transport conditions. Special sealed packing is used for shipments
to countries outside Europe, allowing transport overseas and combined transport and storage durations
of 12 months or more.
Installation and assembly
The delivery of complete factory-assembled and
tested single and double bays reduces the time
and effort required for installation on-site. It only
needs simple devices to move the transport unit
to its installation position and align it for assembly
with the other bays. A mounting frame facilitates
movement and rapid alignment of the bays. Only
few anchorings and hardly any additional steel
supports are required for securing the switchgear to
the foundation. Depending on the bay design, only
the bay termination needs to be assembled. On the
secondary side, only bay-to-bay cabling and interfacing to the substation control and protection system
are required.
Siemens provides complete installation and commissioning on site. Uncomplicated work procedures,
detailed installation instructions, and the use of
relatively few special tools allow easy and rapid
installation of the switchgear by your own personnel
under the guidance of an experienced supervisor
from Siemens. If required, your personnel can
acquire the necessary know-how in a special training
program.
Commissioning
After assembly, the entire switchgear undergoes
final testing for gas-tightness. At the same time,
all switching devices and all electrical circuits for
control and monitoring are tested to ensure their
proper function in both mechanical and electrical
terms. All tests are performed in conformity with
IEC and the results documented in reports.
Operation and maintenance
Our gas-insulated switchgear is designed and manufactured so as to achieve an optimal balance of
design, materials used, and maintenance required.
The hermetically sealed enclosures and automatic
monitoring ensure that the assemblies are practically
maintenance-free under normal operating conditions. We recommend that the first major inspection
be carried out after 25 years.
Siemens AG, Energy Sector, gas-insulated switchgear type series 8DN8
13
Quality assurance and environmental aspects
A consistent quality management system supported
by our employees ensures the production of gasinsulated switchgear of the highest quality. The
system was certified in 1983 in accordance with
CSA Z299 and again in 1989 according to DIN EN
ISO 9001. The quality management system is
process-oriented and subject to continuous improvement. Naturally, the Siemens QM system has been
successfully re-certified at regular intervals according to DIN EN ISO 9001. As early as 1994, a DIN EN
ISO 14001-compliant environment management
system was implemented as an addition to the existing management system and successfully certified.
One of the major milestones in developing testing
expertise was the certification of the test labs
according to ISO/IEC 17025 (previously EN 45001)
in 1992. From that point on, they have been considered independent. The quality and environment
management systems cover every single process
in our products’ life cycles, from marketing to aftersales service.
Regular management reviews and audits of all
processes ensure that the system is effective and upto-date at all times and that appropriate measures
are taken to continuously improve it. The audits are
based on the consistent documentation of all processes relevant to quality and the environment. The
quality of our switchgear consequently meets even
the highest requirements.
In addition to consistent quality management and
environmental protection, the special “clean” areas
set up in the production workshops are an important
contribution towards the high quality of our gasinsulated switchgear. Comprehensive manufacturing
inspections and routine testing of individual components, sub-assemblies, and complete modules all
ensure reliable operation of the overall product.
Routine mechanical tests and final high-voltage testing of the complete bay or complete shipping units
verify that the manufactured quality complies with
the standards.
The expert packing concept is optimized along
ecological lines and provides for the switchgear’s
safe arrival at its destination. Design aspects also
play a crucial role in the outstanding ecological
balance of type series 8DN8 switchgear. The exceptionally compact construction results in low consumption of materials and energy in production, a
relatively small requirement for SF
transport options without wood packaging and finally
lower space requirement for installation of the
switchgear.
, resource-saving
6
14 Siemens AG, Energy Sector, gas-insulated switchgear type series 8DN8
3370 mm
2500 mm
132.68 inch
98.43 inch
3340 mm
2500 mm
131.50 inch
98.43 inch
3520 mm
2500 mm
138.58 inch
98.43 inch
3930 mm
2500 mm
154.72 inch
98.43 inch
Typical bay arrangements
15
All the standard circuit configurations can be
realized using our type series 8DN8 switchgear.
Coupling bay
Overhead line bay
Direct connection to the transformer
Cable bay
Variations are possible with switchgear type series 72.5 kV
Siemens AG, Energy Sector, gas-insulated switchgear type series 8DN8
3930 mm
154.72 inch
Typical configuration with double busbar
14740 mm
580.31 inch
6770 mm
266.54 inch
Ring busbar
B A
A-A
B-B
3590 mm
141.34 inch
AB
16 Siemens AG, Energy Sector, gas-insulated switchgear type series 8DN8
Variations are possible with switchgear type series 72.5 kV
Typical configuration with H-configuration
A A
B B
2490 mm
98.03 inch
C C
9590 mm
377.56 inch
A-A
B-B
Variations are possible with switchgear type series 72.5 kV
C-C
17Siemens AG, Energy Sector, gas-insulated switchgear type series 8DN8
Technical data
Switchgear type series 8DN8
Rated voltage 72.5/145 kV
Rated frequency 50/60 Hz
Rated power frequency withstand voltage (1 min) 140/275 kV
Rated lightning impulse withstand voltage (1.2 / 50 μs) 325/650 kV
Rated normal current busbar 2500/3150 A
feeder 2500/3150 A
Rated short-breaking current 31.5/40 kA
Rated peak withstand current 85/108 kA
Rated short-time withstand current 31.5/40 kA
Leakage rate per year and gas compartment ≤ 0.5% routine test
≤ 0.1% type test
Bay width 650/800/1200 mm
25.59/31.50/47.24 inches
Height, depth see typical bay arrangements
Circuit-breaker operating mechanism (single-pole or common drive) stored-energy spring
Rated operating sequence O-0.3 s-CO-3 min-CO
CO-15 s-CO
Rated supply voltage 48–250 V DC
Expected lifetime > 50 years
Ambient temperature range –30°C to +40°C
Standards IEC/IEEE
Other values on request
For further information
Name/Company
Street
Postal code/City/Country
Phone/Fax
E-mail
Please send me information on the following topics:
Gas-insulated switchgear product range
Gas-insulated switchgear up to 245 kV
Gas-insulated switchgear up to 300 kV
Gas-insulated switchgear up to 550 kV
HIS – Highly Integrated Switchgear up to 145 kV
HIS – Highly Integrated Switchgear up to 550 kV
Phone: +49 9131 / 7-3 34 88
Fax: +49 9131 / 7-3 44 96
E-mail: h-gis.ptd@siemens.com
www.siemens.com/energy/hv-substations
container-type switchgear
rent a GIS – temporary leasing of switchgear
Gas-insulated transmission lines (GIL)
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further copies of this brochure
18 Siemens AG, Energy Sector, gas-insulated switchgear type series 8DN8
With the switchgear type series 72.5 kV deviations are possible
Published by and copyright © 2010:
Siemens AG
Energy Sector
Freyeslebenstrasse 1
91058 Erlangen, Germany
Siemens AG
Energy Sector
Power Transmission Division
High Voltage Substations
Freyeslebenstrasse 1
91058 Erlangen, Germany
www.siemens.com/energy/hv-substations
Order No. E50001-G620-A122-X-4A00
Printed in Germany
Dispo 30000, c4bs No. 7460
fb 3051 470733 WS 08101.
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bleached paper.
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available, which may not apply in all cases.
The required technical options should therefore
be specified in the contract.
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