HIGH-TENSION SWITCHGEAR WITH METAL CASING AND COMPRESSED GAS INSULATION AND WITH AN INSULATED EARTHING SWITCH

摘要

In high-tension switchgear with compressed gas insulation, insulated earthing switches (3) are also used to apply test voltages. To this end, a ring (13) of insulating material, in which a conductor (14) with a terminal lug (15) in contact with the switch pin (5) is embedded, is arranged between the housing (6) and the casing (1). To improve the insulation, the ring (13) of insulating material is arranged in a metal ring (12) which acts as a support ring and receives fastening means (9). It is interrupted only by a terminal lug (15) provided with a sheath of insulating material. The ring of insulating material (13) is thus effectively cushioned against mechanical stresses. The insulated earthing switches are used in high-tension switchgear with metal casings and compressed SF6 gas insulation.