H - Electricity – 02 – B
Patent
H - Electricity
02
B
H02B 13/075 (2006.01)
Patent
CA 2133213
Abstract of the Disclosure EARTHING SWITCH FOR METAL-CLAD, HIGH-VOLTAGE SWITCHGEAR INSULATED WITH COMPRESS GAS In the case of an earthing switch for a metal-clad, high-voltage switchgear insulated with compressed gas, the mobile earthing contact (3, 11) is arranged so as to be insulated from the earthed cladding (1) for measuring purposes. This insulation arrangement of the earthing contact (3, 11) is bypassed by an electrical connection, preferably outside of the cladding (1), for the function of earthing switching device. The electrical connection is released [disconnected] when the earthing contact (3, 11) is connected in the closed position to a measuring device. In accordance with the invention, an additional contact arrangement (7, 7a, 8, 8a) is provided, which is forced to electrically bypass the insulation arrangement and which connects the mobile earthing contact (3, 11) to the earthed cladding outside of the closed and open position in the course of the switching motion between these two positions. By this means, overvoltage resulting from discharge occurrences on the insulation arrangement and, if indicated, damage to measuring instruments connected to the earthing switches are reliably avoided. FIG. 2
Pfaff Dietrich
Pircher Christian
Schmidt Regina
Aktiengesellschaft Siemens
Fetherstonhaugh & Co.
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