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Gas-Insulated Substations

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

Gas-Insulated Substations

GE's B65 GIS is a field-proven solution with high availability that meets the challenges of networks up to 145 kV, 40 kA, 3150 A for power generation, transmission, distribution, tertiary and heavy industry applications. The B65 is one of the most compact 145 kV GIS solutions with single-phase enclosures and is comprised of small, light components making it easy to handle.

The B65 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 smart grid integration.

Building on GE's GIS experience of more than 50 years, the B65 provides high availability and data reliability with single-phase enclosures to prevent phase-to-phase faults and pure-spring circuit breakers drives.


Customer Benefits

Customer Benefits

Main Characteristics

Environment friendliness

  • Low gas weight
  • Advanced SF6 sealing system

High availability

  • Highly reliable solutions backed by years of design and installation experience
  • Current transformers outside SF6
  • Single-phase enclosures: no phase-to-phase fault
  • Pure-spring circuit breaker drives


Low costs of land and civil works

  • Most compact 145 kV GIS with single-phase enclosures

Shortest Site Works

  • Light and small single-phase components, easy to handle

Smart Grid Features

  • full-digital monitoring, control and protection


General ratings
Reference electrotechnical standards IEEE/IEC
Voltages 145 kV
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 50/60 Hz
Continuous current up to 3150A
Short-time withstand current 40 kA
Peak withstand current 100/108 kAp
Duration of short-circuit 3s
Installation indoor
Ambient temperature range down to -25 / up to +55 °C
Circuit-breaker ratings
First-pole-to-clear factor 1.5
Short-circuit breaking current 40 kA
Short-circuit making current 100/108 kAp
Operating sequence O-0.3s-CO-3 min-CO/CO-15s-CO
Drive type (three-phase or single-phase) Pure-spring
Breaking time 50 ms
Closing time 95 ms
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 1600 A / 10 V
Mechanical endurance M2 class
Make-proof earthing switch ratings
Making current capability 100/108 kAp
Switching capability - electromagnetic coupling 80 A / 2 kV
Switching capability - electrostatic coupling 2 A / 6 kV
Mechanical endurance M1 class