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Gas-Insulated Substations

Home > HV/MV Equipment > Gas-Insulated Substations > GIS

Gas-Insulated Substations up to 245 kV

GE's B105 GIS is a compact, field-proven solution with high availability that meets the challenges of networks up to 245 kV for power generation, transmission, distribution, tertiary and heavy industry applications. The B105 is available in several ratings:

  • 245 kV, 50/63 kA, 3150/4000 A

The B105 is environmentally friendly and features one of the lowest gas weights on the market along with an advanced SF6 sealing system. Full digital monitoring control and protection capabilities enable the B105 to be readily integrated into the smart grid.


Customer Benefits

Customer Benefits

Main Characteristics

Environment friendliness

  • Low gas weight
  • Advanced SF6 sealing system
  • Smart grid features including full-digital monitoring, control and protection

High availability

  • One of the best experiences and high data reliability
  • Current transformers outside SF6
  • Pure-spring circuit breaker drives
  • State-of-the-art maintenance isolating device: major repair and HV tests with no more than 1 bay down
  • Drives and accessories at easy reach


Low costs of land and civil works

  • One of the most compact GIS with single-phase enclosures only: bay footprint up to 50% below market average depending on kV rating
  • Complete bays assembled, wired, tested and shipped
  • Light and small single-phase components, easy to handle


General ratings
Reference electrotechnical standards IEC/IEEE/GB
Voltages up to 245 kV
Withstand voltages
- Short-duration power-frequency, phase-to-earth / across isolating distance 460/530 kV
- Lightning impulse, phase-to-earth / across isolating distance 1050/1200 kVp
Frequency 50/60 Hz
Continuous current 3150/4000 A
Short-time withstand current 50/63 kA
Peak withstand current 135/170 kAp
Duration of short-circuit 3s
Installation Indoor/outdoor
Ambient temperature range down to -25 / up to +55 °C
Circuit-breaker ratings
First-pole-to-clear factor 1.3-1.5
Short-circuit breaking current 50/63 kA
Short-circuit making current 135/170 kAp
Operating sequence O-0.3s-CO-3 min-CO/CO-15s-CO
Drive type (three-phase or single-phase) Pure-spring
Breaking time <50 ms
Closing time <100 ms
Mechanical endurance M2 class
Capacitive switching C2 class
Disconnector and low-speed earthing switch ratings
Capacitive current switching 0.25 A
Bus-transfer current switching capability 1600 A / 20 V
Mechanical endurance M2 class
Make-proof earthing switch ratings
Making current capability 135/170 kAp
Switching capability - electromagnetic coupling 80 A / 2 kV
Switching capability - electrostatic coupling 3 A / 12 kV
Mechanical endurance M1 class