Siemens Gas-Insulated Switchgear up to 245 kV, 50 kA, 3150 A Type 8DN9 Owner's Manual - User Guide

Summary

Discover the Type 8DN9 Gas-Insulated Switchgear (GIS), a world-leading, modular substation technology designed for high-voltage power transmission and distribution (up to 245 kV). This compact switchgear ensures superior reliability, low life-cycle costs, and environmental compatibility. The manual provides comprehensive technical documentation for engineers and utilities, detailing system architecture, configurable modules, advanced installation options, and optimal integration into modern electrical grids needing unparalleled performance and flexibility.

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Gas-Insulated Switchgear up to 245 k V, 50 k A, 3150 A Type 8DN9 Power Transmission and Distribution

Page Summary Contents For Siemens Gas-Insulated Switchgear up to 245 kV, 50 kA, 3150 A Type 8DN9 Owner's Manual - User Guide

Page 1 Gas-Insulated Switchgear up to 245 k V, 50 k A, 3150 A Type 8DN9 Power Transmission and Distribution

Page 2 Gaining from Experience Our switchgear ensures extraordinarily high availability with low operating costs.

Page 3 Our 8D range of gas-insulated switchgear repre- sents a highly successful product concept. Since its introduction back in 1968, Siemens has installed more than 17,000 bays worldwide. More than 230,000...

Page 4 Flexibility due to Modular Design A fundamental feature of our gas-insulated switch- The conductors are linked by coupling contacts gear is the high degree of versatility provided by a capable of abso...

Page 5 With only a few modules, all typical switching configurations can be created. 1. Circuit-breaker interrupter unit 2. Spring-stored energy mechanism with circuit-breaker control unit 3. Busbar disconne...

Page 6 Circuit-breaker module The central element of the gas-insulated switchgear is the single-phase encapsulated circuit-breaker mo- dule with its two main components: ■ Interrupter unit ■ Stored-energy sp...

Page 7 Arc-quenching principle 1. Moving arcing contact 7. Counter moving arcing contact 2. Contact finger 8. Insulating nozzle 3. Valve 9. Auxiliary nozzle 4. Compression volume 10. Contact cylinder Interru...

Page 8 Disconnecting switches Disconnecting switches assure a dielectrically safe gap between both contacts for secure isolation of system areas with different potential, e.g., busbar disconnecting switches ...

Page 9 Instrument transformers Both current and voltage transformers are used for measuring and protection purposes. Current transformer The current transformers are of the single-phase inductive type and pr...

Page 10 Termination modules The termination modules connect the bays of the gas-insulated switchgear to the following items of equipment: ■ Overhead lines ■ Transformer or reactor ■ Cables They form the trans...

Page 11 Busbar module Busbars have a three-phase encapsulation. The busbar modules of adjacent bays are connected with expansion joints which absorb constructional toler- ances and temperature-related movemen...

Page 12 Control and Monitoring – Reliable and Flexible Control and Protection System Proven switchgear control Reliable and flexible control and protection system Robust electrical components are used to cont...

Page 13 Transport, Installation, Commissioning, Maintenance Transport Commissioning To facilitate easy transport and on-site installation, After completion of the assembly work on site, all our switchgear ass...

Page 14 Quality Assurance A consistent quality management system supported The quality management and environmental pro- by our employees makes sure that we produce high- tection systems cover every single pr...

Page 15 Technical Data Switchgear type 8DN9 Rated voltage up to 245 k V Rated frequency 50/60 Hz Rated power frequency withstand voltage (1 min) 460 k V Rated lightning impulse withstand voltage (1,2/50 μs) 1...

Page 16 Typical Bay Arrangements The modular system not only allows all customary circuit arrangements but also individual solutions for specific building dimensions, system extensions, and much more. Single ...

Page 17 Bus coupling arrangement Weight of bay: approx. 4 t Double busbar arrangement with transfer bus Weight of bay: approx. 6 t Double busbar arrangement with bypass Weight of bay: approx. 6 t

Page 18 For Further Information Phone: ++49 91 31 / 7-3 46 60 Name / Company Fax: ++49 91 31 / 7-3 46 62 E-mail: [email protected] www.hv-substations.com Street Postal code / City / Country Phone / Fax E-...

Manual Details

Brand	Siemens
Pages	18
File Size	1.50 MB
Published	June 02, 2026

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Frequently Asked Questions

Is this switchgear suitable for sensitive environments like city centers?

Yes, it has extremely low levels of noise and field emission (EMC), making it acceptable for residential quarters and city centers.

How reliable is the operational life of this unit?

The product boasts a recorded bay operation history exceeding 230,000 years, ensuring high reliability and long service life.

Does the design allow for flexible system expansion?

Yes, its modular system gives high versatility and can accommodate all customary bus schemes while allowing configurations via individual modules.

What are the primary advantages of the compact design?

It achieves compactness using improved insulating materials and optimization, contributing to a low weight and an extremely economical solution.