Siemens 3AH35-SE Series, Инструкция по эксплуатации

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9
Primary connections
Figure 2: Vacuum circuit breaker operator
module on page 8 illustrates the pad
provision to accept the primary connections.
Each circuit breaker has three connection
pads at the fixed end of the vacuum
interrupter, and three connection pads on the
flexible connectors that are associated with
the movable contact of the vacuum
interrupter. Interconnecting bus in the circuit
breaker enclosure connects these connection
pads to the roof bushing terminals. Bolting
hardware is M12 x 1.75 grade 8. Torque M12
bolts to 52 ft-lb (70 Nm).
Phase barriers (if applicable)
For certain ratings, insulating barriers are
attached to the circuit breaker and provide
suitable electrical insulation between the
vacuum interrupter and primary conductors
and the enclosure.
Stored-energy operating mechanism
The stored-energy operating mechanism of
the circuit breaker is an integrated
arrangement of springs, coils and mechanical
devices designed to provide a number of
critical functions. The energy necessary to
close and open the contacts of the vacuum
interrupters is stored in powerful opening and
closing springs. The closing springs are
normally charged automatically after a
closing operation, but there are provisions for
manual charging. The operating mechanism
that controls charging, closing and tripping
functions is fully trip-free. “Trip-free” requires
that the tripping function prevail over the
closing function as specified in ANSI/IEEE
C37.04-1999, clause 6.9.
Vacuum interrupter/operator module
The vacuum interrupter/operator module
consists of the three poles, each with its
vacuum interrupter and primary insulators,
mounted above the common operating
mechanism housing. This module is shown in
Figure 4: Vacuum circuit breaker operator
module.
Figure 4: Vacuum circuit breaker operator module
Item Description
48.6 Angled lever
49.0 Contact pressure spring
63.1 Lever - phase C
63.3 Lever - phase A
63.5 Lever - phase B
Figure 3: Vacuum interrupter cutaway view
A
Item Description
A Fixed-contact current connection
B Ceramic insulator
C Arc shield
D Fixed contact
E Moving contact
F Metal bellows
G Guide
H Moving-contact current connection
B
C
D
E
F
B
G
H
48.6
63.3
49.0
49.0
49.0
63.1
63.5