The is a highly efficient, modular, and compact gas-insulated switchgear (GIS) designed for high-voltage power transmission applications up to 245 kV for onshore networks and up to 300 kV for offshore installations. As a foundational pillar of modern high-voltage substations, the 8DN9 system combines advanced single- and three-phase metal encapsulation with sulfur hexafluoride ( SF6SF sub 6
The 8DN9 series is versatile, designed to meet various international standards (IEC, DIN, VDE).
The represents a future-proof, environmentally responsible evolution of medium-voltage GIS. By eliminating SF₆ while retaining the compactness and reliability of gas-insulated technology, it is ideal for greenfield projects in sensitive environments, renewable energy integration, and any application where sustainability and regulatory compliance are paramount. For customers with legacy SF₆ infrastructure, the 8DN9 can be mixed with 8DN8 panels in the same switchboard via busbar adapters, allowing gradual transition. siemens 8dn9
Includes inductive current and voltage transformers or modern resistive-capacitive voltage dividers (RCVD) for accurate measurement and protection.
The 8DN9 uses a mechanism. During fault interruption: The is a highly efficient, modular, and compact
For urban substations where real estate costs are astronomical, the 8DN9 is a lifesaver. A full 12-panel lineup can fit into a footprint that would barely house 4 AIS panels.
| Parameter | Benefit | |-----------|---------| | | 60–80% less than conventional air-insulated switchgear (AIS). | | Maintenance | Sealed for life – no gas handling, no contact cleaning. | | Installation | Pre-assembled, factory-tested, pluggable cable connectors. | | Ambient conditions | Unaffected by dust, humidity, salt spray, small animals. | | Retrofitting | Compatible with existing 8DNx series (e.g., 8DN8 – SF₆ version). | By eliminating SF₆ while retaining the compactness and
Example zone arrangement (145 kV, double busbar):
The 8DN9 isn’t just a box of breakers – it’s a inside aluminum or steel enclosures.
The 8DN9 isn't just another piece of industrial equipment; it is a masterclass in space-saving design. While traditional air-insulated substations require vast outdoor yards to prevent electrical arcing through the air, the 8DN9 uses a specialized gas—Sulfur Hexafluoride ( SF6cap S cap F sub 6
Up to 245 kV (300 kV for specific offshore applications). Rated Frequency: 50/60 Hz. Rated Current (Busbar/Feeder): Up to 4000 A. Short-Circuit Breaking Current: Up to 50 kA. Insulation Medium: SF₆ Gas.