Verification of the seismic resistance of gas-insulated switchgear (GIS)

A brief introduction to the background of seismic requirements is given, and the test procedure for demonstrating the capability of gas-insulated switchgear (GIS) to withstand seismic stresses up to highest ground accelerations of 0.75 g. are described. The verification methods for checking the test object after test are also described. As vibrational tests are very cost-intensive and therefore can only be performed with a representative switchgear arrangement, a calculation method for demonstrating the seismic withstand behavior of practical switchgear arrangements is presented. The tests and calculation results demonstrate the suitability of a three-pole common enclosed GIS design for 145/170 kV for horizontal ground accelerations up to 0.75 g.<
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