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Integrated gas-insulated switchgear application for 145 - 420 kV

Modular GIS in prefabricated housing

Integrated gas-insulated switchgear application (IGA) is a predesigned, standardized and fully integrated configuration based on Hitachi Energy's well proven GIS technology. The IGA provide substantial reduction of installation time compared to conventional substations. It is the ideal solution for customers in need of substations that can be quickly energized for grid expansions, backup or emergency power needs, and for short installation time requirements.

The IGA package comes with all primary and secondary equipment including control, protection, monitoring and communication completely installed in the prefabricated housing. Due to its prefabricated design and short deployment time, it is ideal for applications in the oil, gas and mining industries where it can be easily transported to the sites.


  • Emergency and replacement feeder bay units for utilities
  • Oil and gas industry
  • Mining industry
  • Onshore and offshore wind farm grid connections
  • Remote installations
  • Extreme temperature requirements and harsh environments
  • Trailer mounted switchgear

Why Hitachi Energy?

  • Proven GIS technology over five decades
  • Worldwide footprint and experience
  • Quick delivery and installation time due to prefabricated design
  • Reduced project interfaces resulting in lower risks of delay
  • Significant total project cost savings from reduced on-site work
  • Substantial space savings compared to conventionally built AIS substation
  • Can be easily deployed in challenging and hazardous site installation conditions
  • Modular design makes it effortless to transport between sites

Brief performance data

Integrated gas-insulated switchgear application (IGA)          
Rated voltage [kV] 145 170 245/253 300 420
Rated frequency [Hz] 50/60
Rated short-duration power-frequency withstand voltage (1 min) [kV] 275 325 460 460 650
Rated lightning impulse withstand voltage (1.2/50 µs) [kV] 650 750 1050 1050 1425
Rated switching impulse withstand voltage (250 / 2500 µs) [kV] - - - - 1050
Rated normal current – busbar / feeder [A] 3,150 4,000 3,150 4,000 5,000
Rated short circuit-breaking current [kA] 40 63 50 63 63
Rated short-time withstand current (up to 3 s) [kA] 40 63 63/50 63 63
Rated peak withstand current [kA] 104 164 135 135 170
Number of circuit breaker bays in one transport unit Up to 5 Up to 4 Up to 2 Up to 2 1
Bay width [mm] -

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