T&D Systems > Worldwide Presence > TTDI > Switchgears > Solid Insulated Switchgear (SIS)

Solid Insulated Switchgear (SIS)

SF6 Gas Free Solid Insulated Switchgear
Innovative and Environment Friendly Technology

Prefabricated Substation

Solid Insulated

All live parts of the Solid Insulated Switchgear (SIS) are completely moulded in Toshiba's unique epoxy resin material.


Bus-Bars of all the three phases are segregated from each other contributing to the significantly reduction of the internal arc fault risks.

Surface Shielded

All surfaces of the solid insulated parts are fully covered with a conductive layer grounded to earth. This contributes to the significantly reduction of earth fault risk and ensures higher safety.

Special Features

Technical Parameters

Rated Voltage 36 kV
Lightning Impulse Withstand Voltage 170 kV
Power Frequency Withstand Voltage 70 kV
Rated Frequency 50 Hz
Rated Bus-Bar Current 1250/2000 A
Rated Short Circuit withstand Current 31.5 kA for 3 sec
Bus Bar Configuration Single or Double Bus Bar
Operating Mechanism Motor-Spring Operation
Standard IEC 62271-200 (2011)

Safe in Operation

All Main circuit is moulded with epoxy resin whose surface is covered with conductive carbon layer. All surfaces of epoxy resin are grounded through this conductive Layer.

→Internal Arc Fault Free

Safe in Operation

Safe in Operation

Modular Design, Compact Size, Less Number of Parts, No SF6 gas and high reliability lead to reduced initial and running costs.

→Significant reduction in Total Life Cycle Cost over a period of 25 years when compared to C-GIS and AIS.

Safe in Operation

Compact & Flexible Design

→Weight: 60% of AIS, 50 % of C-GIS
→Volume: 20% of AIS, 60% of C-GIS
→Floor Area Occupied: 23% of AIS & 82% of C-GIS
→Reduces Land usage for Substation

Compact & Flexible Design

Environment Friendly

→Completely SF6 gas free
→Reduced Co2 Emission
→Total reduction of CO2 Emission in life cycle is 62% compared to C-GIS

Environment Friendly

Technical Parameters of the products contained in this website are generic in nature. Please contact us for any Latest / Updated / Specific Information.