We design, manufacture and install Gas Insulated Switchgear (GIS) utilty substation systems and leverage the compact size and encapsulated metal structure to provide significant advantages to our power utility customers.

Compared to air insulated equipment, Gas Insulated Switchgear provides improvements in operational safety, compact physical size, aesthetic appearance, in close quarters operation and in relative environmental risk.

Breaker performance, across voltages of 69 kV to 800 kV, employs our time-tested single break, pure puffer interrupters. These interrupters are superior to all other alternatives in reliability, duration, simplicity of design and low maintenance costs. We also employ one of two Mitsubishi Electric spring spring mechanisms i.e. the next generation torsion bar spring spring (BM-2) mechanism or the pneumatic open-spring close (AM-38) mechanism. The BM-2 is part of a family that many consider the gold standard of spring spring mechanisms in the Industry.

Finally, we have been able to incorporate fast acting, disconnecting and ground switches, to substantially reduce size and modularity. Mitsubishi Electric has also added options for gang/independent pole operation, single/three phases, test and diagnostic capability and ergonomically designed control access panels.

Advantages of Gas Insulated Switchgears

• Occupies about 1/10th the space compared to AIS substations
• Lower frequency and severity of service faults
• GIS is relatively maintenance free
• Can be pre-assembled into modules making installation and commissioning relatively easy

The Mitsubishi Electric Gas Insulated Switchgear solution is perfect for high density, urban environments, where substation expansion is vital in dealing with expanded power demands, as well as programs like vehicle electrification, grid resiliency projects and new commercial/industrial needs. GIS is ideal for the following environments:

1. Large cities and densely populated areas
2. Industrial complexes where reliability in power is vital
3. Mountainous and other hard to reach areas where long term reliability is vital
4. Underground substations where environmental isolation is important
5. Offshore substations, where protection from the environment is important
6. HVDC transmission system terminal substations

Our GIS solution is completely encapsulated and leak free and along with other Mitsubishi Electric provided counter measures, can provide a high security profile to any substation. It is also perfect for rural and suburban environments seeking a better aesthetic adjacent to high end neighborhoods, or the safest and maintenance free substations, where travel time for operational personnel is an issue. By creating compact customer designs, Mitsubishi Electric can elevate equipment, and can encapsulate all in leak free metal piping.