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Gas-Insulated Substations up to 550 kV

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

Gas-Insulated Substations up to 550 kV

GE makes the most of 50 years of experience in design, material selection, development, engineering, manufacturing and servicing of gas-insulated substations. GE's T168 GIS meet the challenges of networks up to 550 kV for all applications: power generation, transmission and heavy industry.

The T168 is compact and accessible, with a bay footprint 12% below previous version.

In addition, the T168 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 T168 to be readily integrated into the smart grid.


Customer Benefits

Customer Benefits


Environment friendliness

  • Gas mass reduced by 6% compared with previous version
  • First-in-class SF6 sealing system
  • Advanced gas management systems

High availability

  • Reliability is founded on GE’s extensive experience at 550 kV
  • Current transformers outside SF6
  • Outstanding accessibility: drives and accessories at easy reach


Low costs of land and civil works

  • Bay volume reduced by 12% compared to previous models

Smart grid features

  • Full-digital monitoring, control and protection


Reference electrotechnical standards   IEC/GB
Voltage kV 550
Withstand voltages
Short-duration power-frequency, phase-to-earth/across open switching device kV 740 / 740 (+315)
Switching impulse, phase-to-earth / across isolating distance kVp 1 300 / 1 175 (+450)
Lightning impulse, phase-to-earth / across open switching device kVp 1 675 / 1 675 (+450)
Frequency Hz 50 / 60
Continuous current A up to 6300
Short-time withstand current kA 63
Peak withstand current kAp 170
Duration of short-circuit s 3
Installation   indoor/outdoor
First-pole-to-clear factor   1.3
Short-circuit breaking current kA 63
Short-circuit making current kAp 170
Operating sequence   O-0.3s-CO-3 min-CO/CO-15s-CO
Capacitive switching Class C2
Capacitive current switching A 0.5
Bus-transfer current switching capability A / V up to 4000 / 100
Making current capability kAp 170
Switching capability-electromagnetic coupling A / kV up to 200 / 25
Switching capability-electrostatic coupling A / kV up to 50 / 50
other data available on request.