This International Standard applies to switchgear assemblies for alternating current of rated
voltages above 52 kV for indoor and outdoor installations, including their supporting structure
rigidly connected to the ground, and does not cover the seismic qualification of live tank
circuit breakers. Switchgear assemblies do have typically low centers of gravity, e.g. gasinsulated
switchgear (GIS).
For switchgear with higher gravity levels, e.g. live tank circuit breakers, the IEC 62271-300 is
applicable.
Where switchgear assemblies are not ground-mounted, e.g. in a building, conditions for
applications are subject to agreement between users and manufacturers.
The seismic qualification of the switchgear assemblies takes into account any auxiliary and
control equipment either directly mounted or as a separate structure.
This standard provides procedures to seismically qualify ground-mounted switchgear
assemblies for rated voltages above 52 kV.
The seismic qualification of the switchgear assemblies is only performed upon request.
This standard specifies seismic severity levels and gives a choice of methods that may be
applied to demonstrate the performance of high-voltage switchgear assemblies for which
seismic qualification is required.
The final seismic analysis shall be performed by assuming that the switchgear is installed on
firm ground.
IEC 62271-207:2007 history
2023IEC 62271-207:2023 High-voltage switchgear and controlgear - Part 207: Seismic qualification for gas-insulated switchgear assemblies, metal enclosed and solid-insulation enclosed switchgear for rated voltages above 1 kV
2013IEC 62271-207:2012/COR1:2013 High-voltage switchgear and controlgear - Part 207: Seismic qualification for gas-insulated switchgear assemblies for rated voltages above 52 kV; Corrigendum 1
2012IEC 62271-207:2012 High-voltage switchgear and controlgear - Part 207: Seismic qualification for gas-insulated switchgear assemblies for rated voltages above 52 kV
2007IEC 62271-207:2007 High-voltage switchgear and controlgear - Part 207: Seismic qualification for gas-insulated switchgear assemblies for rated voltages above 52 kV