A high-speed earthing switch in gas-insulated metal enclosed switchgear

A high-speed earthing switch (HSES) is a permanently installed switching apparatus in gas-insulated metal enclosed switchgear (GIS). A spring driven HSES has been developed and tested in a one-phase and three-phase synthetic test circuit. The HSES rated voltages of 245 kV and 300 kV enable closing (making) operation on the peak value of short circuit current of 100 kA to be performed twice without needing maintenance. This paper presents the main task of an HSES for application in GIS, design characteristics, and two different test procedures. Wide searching throughout standards was made in order to define the real status of this apparatus.