By combining a rugged, low-maintenance design with high short-circuit withstand capabilities and modular flexibility, the 8DN9 provides a robust foundation for power grids that must remain secure, efficient, and adaptable for decades into the future.
Its metal-clad design provides excellent electromagnetic compatibility (EMC) and protects internal components from extreme environmental conditions like humidity or pollution.
: The grounded metal housing ensures that operators are protected from live parts, making it safe for indoor or underground installations. Applications
The main busbars use three-phase encapsulation inside a single aluminum tube casing. This reduces external dimensions and significantly diminishes bay width requirements to just 1500 mm.
) gas for high-quality insulation and arc-quenching, ensuring reliable operation even under extreme environmental conditions.
The 8DN9 leverages a smart hybrid configuration to balance space savings and mechanical accessibility. It uses for the primary feeder layout and three-phase encapsulation for the busbar modules. This hybrid strategy allows for an incredibly condensed layout without restricting service or manual inspection accessibility. 2. Advanced Cast-Aluminum Enclosures
| Feature | Siemens 8DN9 | ABB ELK-14 (now Hitachi) | Schneider GHA | |---------|--------------|--------------------------|----------------| | Voltage max | 170 kV | 145 kV | 170 kV | | Single-phase enclosure | Yes | Yes | No (only three-phase) | | Operating mechanism | Spring-spring | Spring-hydraulic | Magnetic actuator | | Panel width (mm) | 600 | 700 | 800 | | Global installed base | >25,000 bays | >20,000 bays | >8,000 bays |
is a compact, metal-enclosed switchgear solution that utilizes sulfur hexafluoride (SF6) gas for insulation and arc quenching
: The feeder connections are kept in single-phase enclosures to manage dielectric stress. Meanwhile, the busbars share a three-phase enclosure to minimize the equipment's physical footprint.
offers a future-proof solution for utility operators needing to upgrade infrastructure. With its high reliability, minimal footprint, and long lifespan (>50 years), it is a reliable choice for high-voltage transmission.
The circuit breaker uses the proven self-compression principle. It requires minimal operating energy because it utilizes the thermal energy of the electric arc itself to compress the gas needed for quenching. The breaker is paired with a stored-energy spring mechanism, which is mechanically simple and highly reliable over thousands of operating cycles. 2. Disconnector and Earthing Switches
: The hermetically sealed enclosure protects internal components from external factors such as salt spray in coastal areas, industrial dust, and extreme humidity.
: Using a spring-drive mechanism, it can interrupt high-fault currents in less than 3 cycles to protect the grid.
Three-phase or single-phase encapsulated, depending on specific configuration needs. Main Components
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