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F35g

SF6-free g3-Gas-Insulated Substations up to 145 kV

GE's F35g is a g3-gas-insulated substation up to 145 kV, up to 3,150 A and 40 kA using GE’s revolutionary g3 gas mixture as an insulating and switching alternative to SF6.

The F35g g3-GIS is designed to deliver the same performances and reliability features as today’s existing SF6 switchgear, without SF6's environmental impacts. Compared to SF6 switchgear, they feature:

  • Same dimensions and footprint, no drastic addition of raw material such as aluminum compared with other SF6 alternatives
  • Same technical performance
  • Same safety level
  • Same reliability feature

Key Characteristics

  • A drastically reduced impact of gas releases to atmosphere (99% vs. SF6)
  • The lowest environmental impact during the whole life cycle:
    • Impact on climate change: 72% reduction,
    • Best-in-class Life Cycle Assessment (LCA) considering all environmental aspects from manufacturing to end-of-life

The F35 is a compact and accessible GIS solution, with a bay footprint below the market average. Up to 2 bays are assembled together, wired, tested and shipped enabling shorter site works.

GE’s F35g is the first SF6-free g3-gas-insulated substation up to 145 kV to complete ENA assessment in the UK.

Characteristics
Specifications

Main Characteristics

Environment friendliness

  • SF6-free using GE’s g3 gas mixture instead of SF6
  • No pollution transfer in form of raw material increase
  • GWP of the gas mass reduced by 99%
  • Advanced sealing system

High availability

  • Same principles, interfaces, operating mechanisms for both product in g3 and SF6
  • Easy access to drives and accessories
  • Pure-spring circuit breaker drives

Low costs of land and civil works

  • One of the most compact GIS with bay footprint up to 45% below market average depending on kV rating allows to have low civil work and compact switchgear buildings
  • Up to 2 bays 145 kV assembled, wired, tested and shipped
  • Isolating device for voltage transformer and surge arrester

Smart Grid ready

  • Smart grid features including full-digital monitoring, control and protection
  • One of the best experiences and high data reliability
  • Digital substation ready with LPITs (Low Power Instrument Transformers)

Specifications

General ratings
Reference electrotechnical standards IEC
Voltages Up to 145 kV
Insulating and switching medium g3 gas mixture
Withstand voltages
Short-duration power-frequency, phase-to-earth / across isolating distance 275/315 kV
Lightning impulse, phase-to-earth / across isolating distance 650/750 kVp
Frequency 50 Hz
Continuous current up to 3150 A
Short-time withstand current 40 kA
Peak withstand current 108 kAp
Duration of short-circuit 3s
Circuit-breaker ratings
First-pole-to-clear factor 1.5
Short-circuit breaking current 40 kA
Short-circuit making current 108 kAp
Operating sequence O-0.3s-CO-3 min-CO
CO-15s-CO
Drive type (three-phase or single-phase) Pure-spring
Breaking time 50ms
Closing time 95ms
Mechanical endurance M2 class
Capacitive switching C2 class
Disconnector and low-speed earthing switch ratings
Capacitive current switching 0.1 A
Bus-transfer current switching capability 2520/20 A / V
Mechanical endurance M2 class
Make-proof earthing switch ratings
Making current capability 108 kAp
Switching capability - electromagnetic coupling 80/2 A / kV
Switching capability - electrostatic coupling 2/6 A / kV
Mechanical endurance M1 class