Gas-insulated switchgear 8DQ1-6, 420 kV / 63 kA rating class, single-phase encapsulated SF6 GIS, self-compression interrupter, stored-energy spring drive, 2200 mm bay
8DQ1 6
- Built to the 420 kV / 63 kA class of the 8DQ1 single-phase encapsulated GIS: withstand levels up to 650 kV power-frequency (1 min), 1425 kV lightning impulse and 1050 kV switching impulse; peak withstand up to 170 kA and short-time withstand up to 63 kA for 3 s.
- Self-compression SF6 interrupter unit with stored-energy spring operating mechanism; rated operating sequence O-0.3 s-CO-3 min-CO | CO-15 s-CO.
- Compact bay design: 2200 mm bay width, 3800 x 5800 mm bay height x depth and approx. 11 t bay weight; typical cable-feeder footprint 2.2 x 5.8 m at 3.8 m height, bus coupler 4000 x 4500 mm, one-and-a-half-breaker diameter 21500 x 5100 mm.
- Indoor and outdoor installation at -30 °C to +55 °C ambient; type-tested gas leakage rate below 0.1 % per year and gas compartment; first major inspection after more than 25 years, expected lifetime over 50 years.
- Fulfills the latest IEC standards (IEC 62271-1, -100, -102, -110, -203, -207) and is offered to IEC / IEEE / GOST rating structures; modular structure with passive busbar, disconnector / earthing-switch modules, conventional and RC-divider instrument transformers, cable, outdoor-bushing and transformer termination modules.
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8DQ1 6 covers up to 420 kV of the gas-insulated switchgear range (≤ 550 kV across the category, √ scale).
Specifications
Main
| Product family | 8DQ1 (Siemens Energy 8D series GIS), design generation 8DQ1-6 (420 kV / 63 kA class) |
| Type | Gas-insulated, metal-enclosed switchgear (GIS), single-phase encapsulated |
| Voltage class | 420 kV (380-420 kV networks) |
| Insulation medium | SF6 |
| Interrupter technology | Self-compression principle |
| Installation | Indoor / outdoor |
| Application | Transmission substations |
Electrical
| Rated voltage | Up to 420 kV |
| Rated frequency | 50/60 Hz |
| Rated short-duration power-frequency withstand voltage (1 min) | Up to 650 kV |
| Rated lightning impulse withstand voltage (1.2/50 us) | Up to 1425 kV |
| Rated switching impulse withstand voltage (250/2500 us) | Up to 1050 kV |
| Rated normal current, busbar / feeder | Up to 6300 A / up to 5000 A |
| Rated short-circuit breaking current (< 2 cycles) | Up to 63 kA |
| Rated peak withstand current | Up to 170 kA |
| Rated short-time withstand current (up to 3 s) | Up to 63 kA |
Mechanical / environment
| Circuit-breaker drive mechanism | Stored-energy spring |
| Rated operating sequence | O-0.3 s-CO-3 min-CO | CO-15 s-CO |
| Bay width | 2200 mm |
| Bay height x depth (depending on bay arrangement) | 3800 x 5800 mm |
| Bay weight (depending on bay arrangement) | 11 t |
| Typical bay arrangements (product presentation) | Cable feeder 2.2 x 5.8 m footprint, 3.8 m height; bus coupler 4000 x 4500 mm; one-and-a-half-breaker diameter (C01) 21500 x 5100 mm |
| Ambient temperature range | -30 C to +55 C |
| Gas leakage rate (type-tested) | < 0.1 % per year and gas compartment |
| First major inspection / expected lifetime | > 25 years / > 50 years |
Standards & certifications
| Rating structures | IEC / IEEE / GOST (420 kV class per 8DQ1 technical datasheet 2025) |
| IEC compliance | IEC 62271-1 (common specifications), 62271-100 (AC circuit-breakers), 62271-102 (AC disconnectors and earthing switches), 62271-110 (inductive load switching), 62271-203 (gas-insulated metal-enclosed switchgear > 52 kV), 62271-207 (seismic qualification of GIS assemblies) |
Options & variants
Values from the 420 kV / 63 kA column of the 8DQ1 technical datasheet (2025) ratings table — the rating class documented for the 8DQ1-6 design generation's installed base. The wider 8DQ1 family also offers 245 kV / 80 kA, 420 kV / 80 kA and 550 kV / 63 kA rating classes, listed under the 8DQ1 family entry; 8DQ1-x suffixes denote design generations rather than rating classes, and earlier generations were built for both 420 kV and 550 kV. Other values on request.
| Rated voltage | Breaking current | Busbar / feeder current | Frequency | Bay width | Standards |
|---|---|---|---|---|---|
| 420 kV | up to 63 kA | 6300 A / 5000 A | 50/60 Hz | 2200 mm | IEC / IEEE / GOST |
Documents & downloads
Datasheet Gas-insulated switchgear type 8DQ1 — Technical data (2025)
Presentation Gas-insulated switchgear 8DQ1 up to 420 kV, 63 kA — product presentation
Datasheet 8DQ1 technical datasheet 2021 (Chinese)
Also covered in the technical library
Catalog Gas-insulated switchgear from 72.5 kV up to 550 kV — Siemens Energy GIS brochure
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8DQ1