During a high current/voltage switching operation an electrical arc occurs. These arcs can cause functional failures of the electrical system.
Siemens is looking for a new solution to ensure safe switching of high currents and high voltages.
The present solution prevents the evaporation/damage of the contact areas through electrical arcs when switching.
Siemens would like to find a new solution with a reasonable lead time.
The three-position switch-disconnector is used in a three phase gas-insulated, metal-enclosed, medium-voltage switchgear acc. to Norm IEC 62271-1-200.
The switch has the functions switch-disconnector and make-proof earthing switch.
The operation is carried out via a rotary bushing welded gas-tight into the front of the switchgear vessel.
Mode of operation:
The operating shaft forms one unit together with the three contact blades.
During the closing operation, the operating shaft with the moving contact blades changes from the “OPEN” to the “CLOSED” position.
During the earthing operation, the operating shaft with the moving contact blades changes from the “OPEN” to the “EARTHED” position.
The force of the spring-operated mechanism ensures a high operator-independent closing speed and a reliable connection of the main circuit.