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Milestones

Gas-insulated switchgear 72.5 kV - 1,200 kV

1968

World's first 170 kV GIS

 

1976

First 550 kV GIS

 

1984

Largest 550 kV GIS installation

1987

First 800 kV GIS

1992

First integrated 170 kV GIS

 

1997

Most compact 145 kV GIS

 

2005

Underground 145 kV GIS installation

 

2006

Chinas largest 500 kV GIS installation

 

2008

Ultra high-voltage 1,100 kV GIS

 

2009

Largest urban 550/220/123 kV GIS installation

 

2010

Largest 420 kV GIS installation

 

2012

Highest voltage level in the world 1,200 kV GIS

 

2013

First compact 420 kV GIS

 

2015

Offshore 420 kV GIS

 

2015

World’s first Eco-GIS 170 kV GIS

 

2017

Africas largest 145 kV GIS installation