T155 Dual Gas

SF₆ and g³ Gas-Insulated Substations up to 420 kV

GE's T155 Dual Gas GIS meets the challenges of networks up to 420 kV for power generation, transmission, and heavy industry applications.

Ready for future SF₆ gas regulations

Anticipating future SF₆ regulations, this Dual-Gas equipment is available with either g³ or SF₆ gas as an insulating and switching medium. Based on having the same foundational design, Transmission System Operators (TSOs) can buy the SF₆ version today and easily switch to GE’s g³ solution at a later time.

The T155 Dual Gas GIS is very compact and accessible, with a bay footprint equivalent to the previous SF₆ T155 model. Complete bays are fully assembled in the factory (wired, tested, packaged, and shipped), enabling shorter site works.

In addition, the T155 Dual-Gas GIS features an advanced SF₆ sealing system with a sealing length divided by two compared to the previous version, improving tightness.

Full digital monitoring control and protection capabilities enable the T155 Dual Gas to be readily integrated into the smart grid.

T155 Dual Gas

SF₆ and g³ Gas-Insulated Substations up to 420 kV

GE's T155 Dual Gas GIS meets the challenges of networks up to 420 kV for power generation, transmission, and heavy industry applications.

Ready for future SF₆ gas regulations

Anticipating future SF₆ regulations, this Dual-Gas equipment is available with either g³ or SF₆ gas as an insulating and switching medium. Based on having the same foundational design, Transmission System Operators (TSOs) can buy the SF₆ version today and easily switch to GE’s g³ solution at a later time.

The T155 Dual Gas GIS is very compact and accessible, with a bay footprint equivalent to the previous SF₆ T155 model. Complete bays are fully assembled in the factory (wired, tested, packaged, and shipped), enabling shorter site works.

In addition, the T155 Dual-Gas GIS features an advanced SF₆ sealing system with a sealing length divided by two compared to the previous version, improving tightness.

Full digital monitoring control and protection capabilities enable the T155 Dual Gas to be readily integrated into the smart grid.

Transition from SF₆ to g³ technology today to reach your carbon neutrality targets faster. Compare the carbon footprint of your substation using g³ products in place of SF₆.

Transition from SF6 to g³

Customer Benefits

Customer Benefits

Characteristics

Sustainability
  • 100% SF₆-free version available with T155 Dual Gas GIS (with g³ gas)
  • The gas contribution to global warming is reduced by 99% using GE’s g³ gas instead of SF₆
  • First-in-class gas sealing system
  • Improved tightness due to sealing length divided by two, compared to the previous version
High availability
  • Current transformers located outside SF₆/g³ gas compartment
  • Pure-spring circuit breaker drives
  • State-of-the-art maintenance isolating device: major repair and HV tests with no more than one bay down
  • Outstanding accessibility to drives and accessories
Low costs of land and civil works
  • Very compact GIS: bay footprint remains the same as latest SF₆ GIS
Short site works
  • Complete bays are fully assembled in the factory (wired, tested, packaged, and shipped)
Smart grid features
  • Full-digital monitoring, control and protection

Specifications

 g³Combined g³ bay-SF₆ CBSF₆
GIS Type
T155g 420 kV
T155 420 kV
T155 420 kV
Reference electrotechnical standardsIECIEC/IEEEIEC/IEEE
Rated voltage362-420 kV362-420 kV362-420 kV
Withstand voltages
 Short-duration power-frequency, phase-to-earth/across open switching device650/815 kV650/815 kV650/815 kV
Switching impulse, phase-to-earth / across isolating distance1050/900(+345) kVp1050/900(+345) kVp1050/900(+345) kVp
Lightning impulse, phase-to-earth / across open switching device1425/1425(+240) kVp1425/1425(+240) kVp1425/1425(+240) kVp
Frequency50 Hz50/60 Hz50/60 Hz
Continuous currentup to 5000 Aup to 5000 Aup to 5000 A
Short-time withstand current63 kA63 kA63 kA
Peak withstand current170 kAp170 kAp170 kAp
Duration of short-circuit3s3s3s
Installationindoor/outdoorindoor/outdoorindoor/outdoor

Circuit Breaker Ratings

Short-circuit breaking current63 kA63 kA63 kA
Short-circuit making current170 kAp170 kAp170 kAp
Operating sequenceO-0.3s-CO-3 min-CO/CO-15s-COO-0.3s-CO-3 min-CO/CO-15s-COO-0.3s-CO-3 min-CO/CO-15s-CO
Drive typePure-springPure-springPure-spring
Mechanical enduranceM2 classM2 classM2 class
Capacitive switchingC2 classC2 classC2 class

Disconnector and Low-speed Earthing Switch Ratings

Capacitive current switching0.5 A0.5 A0.5 A
Bus-transfer current switching capability3000 A / 20 V3000 A / 20 V3000 A / 20 V
Mechanical enduranceM2 classM2 classM2 class

Make-proof Earthing Switch Ratings

Making current capability170 kAp170 kAp170 kAp
Switching capability-electromagnetic coupling160 A / 10 kV  
Switching capability-electrostatic coupling18 A / 20 kV18 A / 20 kV18 A / 20 kV
Mechanical enduranceM1 classM1 classM1 class

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