8DN9 2
Gas-insulated switchgear 8DN9-2, up to 245 kV, 50 kA, 4000 A, SF6, single-phase encapsulated, indoor
8DN9 2
- Current design series of the 8DN9 245 kV platform with more than 7,300 8DN9 installations worldwide (2,498 in Europe, 3,340 in Asia, 749 in the Americas)
- Passive busbar concept: no active devices in the busbar, only two flanges / O-ring gas seals per busbar compartment for high reliability and service continuity
- Complete modular system: self-compression circuit-breaker, motor-driven disconnector and high-speed earthing switch (2G-Mot / 8D-Mot drives), CT, inductive VT (S49 / S95) or RCVD 245 RC divider, surge arrester, expansion joints and termination modules
- Standardized interfaces: cable terminations per IEC 62271-209 (plug-in up to 170 kV, dry-type for 245 kV), direct transformer termination per IEC 62271-203, porcelain or composite outdoor bushings
- Extendable while in service with bay-wise shipment, integrated local control cubicle and M2-class mechanical endurance for disconnector and earthing switch
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8DN9 2 covers up to 245 kV of the gas-insulated switchgear range (≤ 550 kV across the category, √ scale).
Specifications
Main
| Product family | 8DN9 design series 2 (official product hierarchy "8DN9 2", GIS 8D SF6 series) |
| Design | Gas-insulated, metal-enclosed modular switchgear (GIS) |
| Encapsulation | Single-phase encapsulated (per GT product hierarchy); feeders available with three-phase or single-phase enclosed busbar arrangements |
| Application | Transmission substations, onshore up to 245 kV; offshore up to 300 kV |
| Insulation medium | SF6 |
| Interrupter technology | Self-compression principle |
| Circuit-breaker drive | Stored-energy spring mechanism with circuit-breaker control unit |
| Disconnector / earthing switch drives | Motor operating mechanisms, types 2G-Mot and 8D-Mot |
| Busbar concept | Passive busbar — no active devices, two flanges / O-ring seals per busbar compartment |
| Bay configurations | Single or double busbar feeder, bus coupler, 1 1/2-circuit-breaker arrangement |
| Installation | Indoor |
Electrical
| Rated voltage | up to 245 kV (offshore applications up to 300 kV) |
| Rated frequency | 50 / 60 Hz |
| Rated short-duration power-frequency withstand voltage (1 min) | up to 460 kV |
| Rated lightning impulse withstand voltage (1.2/50 us) | up to 1,050 kV |
| Rated normal current, busbar / feeder (bus coupler) | up to 4,000 A / 4,000 A |
| Rated short-circuit breaking current (< 3 cycles) | up to 50 kA |
| Rated peak withstand current | up to 135 kA |
| Rated short-time withstand current (up to 3 s) | up to 50 kA |
| Rated operating sequence | O-0.3 s-CO-3 min-CO / CO-15 s-CO |
| Instrument transformers | CT with cores on bushing type S3 (170-245 kV); inductive VT S49 / S49T(M) single-phase or S95 three-phase; RC divider RCVD 245 (DC to 2.5 kHz, signal power <= 2.5 W) |
Mechanical / environment
| Bay width | 1,500 mm |
| Bay height x depth (depending on bay arrangement) | 3,700 mm x 5,100 mm |
| Bay weight | 7.5 t |
| Ambient temperature range | -25 C to +55 C |
| Rated supply voltage | 110 - 250 V DC |
| Leakage rate per year and gas compartment (type-tested) | < 0.1 % |
| Mechanical endurance, disconnector & earthing switch | Class M2 |
| Extension | Extendable while in service; bay-wise shipment; integrated local control cubicle |
| First major inspection | > 25 years |
| Expected lifetime | > 50 years |
Standards & certifications
| Product standards | IEC / IEEE / GOST (per manufacturer datasheet) |
| Cable termination interface | IEC 62271-209 — conventional XLPE, plug-in connection up to 170 kV, dry-type connection for 245 kV |
| Transformer termination interface | IEC 62271-203 |
| RC divider type testing | Type tested acc. IEC, IEEE, GOST and GB (China) |
| Type testing | Circuit breakers completely type-tested in accordance with latest IEC / ANSI standards before market launch (per manufacturer GIS brochure) |
| Test laboratory | Lead factory Berlin lab accredited per IEC 17025; PEHLA network and STL member lab |
Documents & downloads
Datasheet Gas-insulated switchgear type 8DN9 — Technical data (2022)
Datasheet 8DN9 Technical datasheet 2021 (Chinese)
Catalog Gas-insulated switchgear from 72.5 kV up to 550 kV — portfolio overview (current online edition)
Presentation 8DN9 up to 245 kV, 50 kA, 4000 A — product presentation (module-by-module)
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