Description
10 REVISION 02 * DESCRIPTION SIMOSEC * 832-6063.0
8 Components
For further information about modules or components of your SIMOSEC switchgear,
please refer to the medium voltage switchgear catalog.
8.1 Three-position switch-disconnector
The three-position switch-disconnector is designed to break normal currents of up to
600 A and to ground the feeder cables of the panel.
Mode of operation The three-position switch-disconnector combines the functions of a switch-disconnector
and a make-proof grounding switch. Make-proof grounding switches are grounding
switches with short-circuit making capacity.
The switch shaft with the moving contact pieces rotates inside the chamber containing
the fixed contact pieces. Compression vanes, which rotate in conjunction with the
switch shaft, divide the arcing chamber into two subchambers, each of which changes in
conjunction with the rotation. During the switching movement, the compression vanes
generate a pressure difference between the subchambers. The SF
6
gas flows through a
nozzle, causes a directional blow-out of the breaking arc and quenches it rapidly.
Interlocking is not necessary as the "CLOSED" and "GROUNDED" functions cannot be
implemented simultaneously.
Features • Switch-disconnector
• Metal-enclosed, with gas-insulated, maintenance-free quenching principle
• No external cross insulation between phases
• Designed as a multi-chamber switch with the functions:
- switch-disconnector and
- make-proof grounding switch
• Three-position switch-disconnector with air-insulated primary connections for bus bar
and feeder
• Operation via pivoting-arm welded gas-tight in the front of the switchgear vessel
• Hermetically welded, gas-tight stainless-steel vessel
•Up to 600 A
Fig. 4: Three-position switch-disconnector 600 A
a
Bushing-type insulator for bus bar
s
Spring-operated mechanism with
detachable lever
d
Mounting location for three-phase cur-
rent transformer (option)
f
Bushing-type insulator for feeder
g
Three-position switch-disconnector
h
Switchgear vessel made of
stainless steel
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