Interrupter/Operator-Description; Interrupter/Operator Su Bassembly; Construction - Siemens 5-FSV-350 Installation Operation & Maintenance

Interrupter/Operator
Description
The type M SV and FSV vacuum circuit b reakers are of d rawout
construction, and conform to the requirements of ANSI C37.20
for breakers to be applied i n metal clad switchgear. The vac­
uum circuit b reakers consist of a com bination of two sub-as­
semblies. The "interrupter/operator" sub-assembly is a unitized
assembly of the th ree vac u u m interrupters, primary insulators,
and operating mechanism. The second su b-assembly, the
"vehicle" is the s u pporting d raw-out structure sub-assem bly
into which i s fitted the first sub-assembly. The d rawout struc­
ture su b-assembly p rovides primary stud extensions, closed
breaker racking interlocks, closing spring discharge feature,
and other requ i rements needed to ensure safe and reliable
use d u ring racking and fully connected operations.
These two s u b-assem blies will be separately described.
Interrupter/Operator
Sub-Assembly
The interru pter/operator s u b-assembly consists of the t h ree
poles, each with its vac u u m interrupters and p rimary insu la­
tors, mounte d on the common motor or hand charged spring
1 6 20
60
40
Typical Vacuum Tube and Operating Mechanism
Subassembly
Figure 4
SKV Vacuum Breaker
2 7
29
stored energy operating mechanism housin g . This s ub-as­
sembly is shown i n figures 4 - 5.
Construction (Refer to Figures 4 - 8)
Each of the ci rcuit b reaker poles are fixed to the rear of the
operating mechanism housing (60) by two cast-resin insula­
tors (16). The insulators also connect to the upper (20 and lower
(40) poles su pports which in turn support the ends of the vac­
u u m interru pter (30). Where required by dielectric require­
ments, assemblies are fitted with phase barriers (80).
The pole su pports are aluminum castings on all circuit breaker
ratings, except for 3000A continuous cu rrent where copper
castings are u sed and on the 15-FSV-500, 1 200A where sheet
steel supports are used .
The support pole terminals, (27 ) and (24) each receive p rimary
stud extensions.
The energy-storing mechanism and all the control and actuat­
ing devices are installed in the mechanism housing (60) The
mechanism is of the spring charged stored energy type and is
mechanically and electrically trip free.
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60 55
Mechanism Housing
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