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 drive driven HSES has been developed and tested in one-phase and three-phase synthetic test circuit. The HSES rated voltages of 245 kV and 300 kV, enable to performed closing (making) operation on the peak value of short circuit current of 100 kA twice without needing maintenance. This paper presents the main task of an HSES at 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.