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Hybrid Gas-Insulated Switchgear

Home > HV/MV Equipment > Gas-Insulated Substations

B105 & T155
Hybrid Gas-Insulated Switchgear

The B105 & T155 H-GIS Hybrid Gas-Insulated Switchgear meet the challenges of networks up to 550 kV in power generation, transmission and heavy industry applications.

The B105 & T155 are compact and accessible, with a bay footprint 40% below the market average. Complete bays are assembled, wired, tested and shipped enabling shorter site works.

In addition, the B105 & T155 are 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 & T155 to be readily integrated into the smart grid.


Customer Benefits

Customer Benefits

Main Characteristics

Environment friendliness

  • Lowest gas weight on market
  • First-in-class SF6 sealing system

High availability

  • Best experiences and high data reliability
  • Current transformers outside SF6
  • Pure-spring circuit breaker drives
  • Outstanding accessibility: drives and accessories at easy reach

Short site works

  • Complete bays assembled, wired, tested and shipped


General ratings
Reference electrotechnical standards IEEE/IEC/GB IEEE/IEC/GB IEEE/IEC/GB
Voltages 253 kV 362/420 kV 550 kV
Withstand voltages
- Short-duration power-frequency, phase-to-earth / across open switching device 460/530 kV 680/815 kV 710/925 kV
- Switching impulse, phase-to-earth / across isolating distance   1050/900(+345) kVp 1175/900 (+450) kVp
- Lightning impulse, phase-to-earth / across open switching device 1050/1200 kVp 1425/1425(+240) kVp 1550/1550(+315) kVp
Frequency 50/60 Hz 50/60 Hz 50/60 Hz
Continuous current up to 4000 A up to 5000 A up to 5000 A
Short-time withstand current/Duration of short-circuit 50-63 kA / 3 s 63 kA / 3 s 63 kA / 3 s
Ambient temperature range down to -30 °C /
up to +55 °C
down to -30 °C /
up to +55 °C
down to -30 °C /
up to +55 °C
Circuit-breaker ratings
First-pole-to-clear factor 1.3 - 1.5 1.3 - 1.5 1.3
Short-circuit breaking current 50-63 kA 63 kA 63 kA
Short-circuit making current 135-170 kAp 170 kAp 170 kAp
Operating sequence O–0.3s–CO–3 min–CO/CO–15s–CO O-0.3s-CO-3 min-CO/CO-15s-CO O-0.3s-CO-3 min-CO/CO-15s-CO
Drive type Pure-spring Pure-spring pure-spring or hydraulic
Breaking time 3 cycles 2 cycles 2 cycles
Mechanical endurance M2 class M2 class M2 class
Capacitive switching C2 class C2 class C2 class