8DN8
Gas-insulated switchgear 8DN8, 145–170 kV, up to 63 kA, SF6-insulated bay with stored-energy spring drive
8DN8
- Proven 8D-series platform: more than 24,000 bays installed since 1968 and well over 285,000 bay-years of recorded operation
- Two versions cover the 145 kV class (40 kA, 3150 A) and the 170 kV class (63 kA, 4000 A) with a common design concept
- Very high gas-tightness: type-tested leakage rate below 0.1 % per year and gas compartment
- Low life-cycle cost: first major inspection after more than 25 years, expected lifetime beyond 50 years
- Compact bays (800 mm / 1000 mm wide, 3 t / 4.7 t) for indoor or outdoor installation from -30 °C to +55 °C
Transmission substationsSub-transmission substationsSpace-constrained indoor substationsOutdoor substation installations
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8DN8 covers up to 170 kV of the gas-insulated switchgear range (≤ 550 kV across the category, √ scale).
Specifications
Main
| Type designation | 8DN8 |
| Product type | Gas-insulated, metal-enclosed high-voltage switchgear (GIS) |
| Voltage classes | Up to 145 kV and up to 170 kV versions |
| Insulating medium | SF6 |
| Interrupter technology | Self-compression principle circuit-breaker |
| Drive mechanism (circuit-breaker) | Stored-energy spring |
| Installation | Indoor / outdoor |
| Application | Transmission and sub-transmission substations |
Electrical
| Rated voltage | up to 145 kV / up to 170 kV |
| Rated frequency | 50 / 60 Hz |
| Rated short-duration power-frequency withstand voltage (1 min) | up to 275 kV / up to 325 kV |
| Rated lightning impulse withstand voltage (1.2/50 µs) | up to 650 kV / up to 750 kV |
| Rated normal current, busbar and feeder | up to 3150 A / up to 4000 A |
| Rated short-circuit breaking current | up to 40 kA / up to 63 kA |
| Rated peak withstand current | up to 108 kA / up to 170 kA |
| Rated short-time withstand current (up to 3 s) | up to 40 kA / up to 63 kA |
| Rated break time | < 3 cycles |
| Rated operating sequence | O-0.3 s-CO-3 min-CO and CO-15 s-CO |
Mechanical / environment
| Bay width | 800 mm (145 kV) / 1000 mm (170 kV) |
| Bay height x depth (arrangement-dependent) | 2600 x 4100 mm (145 kV) / 3200 x 5500 mm (170 kV) per 2021 datasheet; current online portfolio edition lists 2600 x 4100 mm for both classes |
| Bay weight | 3 t (145 kV) / 4.7 t (170 kV) per 2021 datasheet; current online portfolio edition lists 4.5 t / 6 t |
| Ambient temperature range | -30 °C up to +55 °C |
| Gas leakage rate (type-tested) | < 0.1 % per year and gas compartment |
| Rated supply voltage | 48 – 250 V DC |
| First major inspection | > 25 years |
| Expected lifetime | > 50 years |
Standards & certifications
| Standards (per datasheet) | IEC / IEEE / GOST |
| Applicable GIS product standard | IEC 62271-203 (gas-insulated metal-enclosed switchgear above 52 kV) — inferred; the datasheet cites only "IEC / IEEE / GOST" without clause numbers |
Options & variants
The two versions published in the manufacturer's 2021 technical datasheet. No recent order history was available to derive commercially ordered configurations. Other ratings available on request per datasheet.
| Version | Rated voltage | Short-circuit breaking current | Normal current (busbar/feeder) | Bay width |
|---|---|---|---|---|
| 8DN8, 145 kV class | up to 145 kV | up to 40 kA | up to 3150 A | 800 mm |
| 8DN8, 170 kV class | up to 170 kV | up to 63 kA | up to 4000 A | 1000 mm |
Documents & downloads
Datasheet Gas-insulated switchgear type 8DN8 — Technical data (2021)
Datasheet Gas-insulated switchgear type 8DN8 — Technical data (2021, Chinese)
Catalog Gas-insulated switchgear from 72.5 kV up to 550 kV — portfolio overview (current online edition)
Ordered designations
Representative orderable type designations of this family — searchable via the catalog search.
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