8DN8 Switchgear up to 170 kV
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8DN8 Switchgear up to 170 kV
Gas Insulated Switchgear
The Siemens 8D range of gas-insulated switchgear (GIS), for rated voltages from 72.5 kV up to 550 kV, is an extremely successful product concept.
Since its introduction back in 1968, Siemens has installed more than 34,500 bays worldwide in all climatic zones of the earth. More than 420,000 years of bay operation have been recorded since. The experience gained from over 45 years with SF6 technology together with continuous development based on the latest research findings, assures demand-oriented technology and the highest possible level of quality and cost-effectiveness. All requirements, which are nowadays usually specified for modern and advanced switchgear with respect to performance and reliabiliy, are met by Siemens-switchgear.
Cost-effectiveness, reliability and customer support are the distinctive features of Siemens gas-insulated switchgear for rated voltages from 72.5 kV up to 800 kV.
Their compact design allows their use in the most confined spaces, whether in the basement of a high-rise building, in a department store, in an industrial plant, on the first floor of an old historic building or in a mobile container. The modular structure of the switchgear permits flexible designs and problem-free extension.
Siemens' gas-insulated metal-encapsulated switchgear, a world leader in terms of:
In addition to gas-insulated switchgear, we also supply gas-insulated transmission lines (GIL) for transmitting high capacities of power over long distances.
With the intelligent control and monitoring solution SICAM, Siemens has created a new system of hard- and software components for the automation of switchgear in the field of electrical energy supply.
The flexible protection and control system offers a sequence of new functions:
Partial discharge monitoring increases the reliability of high-voltage switchgears. It enables any changes in the insulation to be detected at an early stage during normal operation so that appropriate remedial action can be taken. Maintenance measures can thus be controlled according to requirements, thereby reducing operating costs. The measurement data is displayed and archived in the control room. With the aid of an expert system the user can produce trend forecasts from long-term archive data so that potential faults can be eliminated at an early stage. Thanks to the built-in self-monitoring, the system can also be used in unmanned substations.
The PD monitoring system is a sophisticated measuring system, by means of which it is possible to monitor internal partial discharges in gas-insulated switchgear (GIS).
It comprises a number of components:
1 SF6 gas-insulated metal-enclosed switchgear
2 Coupler : act as UHF antennas, integrated in the GIS at a number of points
3 PD converter box (node) : Measuring device, connected to the PD couplers of the three phases of a point of installation
4 Optical-fibre bus system : Device for data transmission between the measuring points and the contral processor unit
5 Central processor unit : Monitoring of the data stream from up to 90 measuring points
6 Operator unit : PC for visualisation, archiving and automatic interpretation of the measured data
Modem : for remote operation and data telecommunication
Our type series 8DN8 switchgear for rated voltages from 72.5 kV up to 170 kV represents one of the most compact systems of its kind available worldwide. Switchgear type series 8DN8 combines technical expertise with all standards and advantages of the Siemens 8D type series.
It also offers a number of distinct advantages:
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 recycling - and meet all current requirements for environmentally compatible high-voltage switchgear.
The switchgear 8DN8 for 72.5 kV corresponds to switchgear 8DN8 for 145 kV up to 170 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.
|Rated voltage||up to||145 kV||170 kV|
|Rated frequency||50/60 Hz||50/60 Hz|
|Rated short-duration power frequency |
withstand voltage (1 min)
|up to||275 kV||325 kV|
|Rated lightning impulse|
withstand voltage (1.2/50 µs)
|up to||650 kV||750 kV|
|Rated normal current - busbar||up to||3150 A||4000 A|
|Rated normal current - feeder||up to||3150 A||4000 A|
|Rated short-circuit breaking|
current (< 3 cycles)
|up to||40 kA||63 kA|
|Rated peak withstand current||up to||108 kA||170 kA|
|Rated short-time withstand|
current (up to 3 s)
|up to||40 kA||63 kA|
|Leakage rate per year and |
gas compartment (type-tested)
|< 0.1 %||< 0.1 %|
|Driving mechanism of circuit breaker||stored-energy spring (common or single pole drive)||stored-energy spring (common or single pole drive)|
|Bay width common pole drive||800 mm||1000 mm|
|Bay width single pole drive||1200 mm||1000-1200 mm|
|Ambient temperature range |
|-30 °C up to +55 °C||-30 °C up to +55 °C|
|Standards||IEC / IEEE / GOST||IEC / IEEE / GOST|
Other values on request
You find the following information in the download area:
Customer Support Center
Phone: +49 180 524 70-00 *
* Charges depending on provider; from the German fixed network € 0.14/min. and from the German mobile phone networks max. € 0.42/min.
Innovation meets experience - Siemens 8DN8 gas-insulated switchgear