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54
D. Solenoid mounting screws must be
installed using thread locking
adhesive (Loctite #222, Siemens part
15-133-281-007) and primer (Loctite
primer T, Siemens part 15-133-281-
005).
E. Connect wires to coils with new "push
on" wire terminals (Siemens part 15-
171-600-002).
3. Lubricate operating mechanism in
accordance with instructions that follow.
4. When work is finished, operate circuit
breaker, CLOSE/OPEN several times, and
check that all screw connections are tight.
Vacuum interrupter replacement
It is recommended that vacuum interrupters
be replaced only by a qualified Siemens field
service representative. The information in the
following sections is provided to aid in
understanding the replacement procedures.
Vacuum interrupters for type GMSG circuit
breakers rated 63 kA interrupting and type
GMSG-GCB generator circuit breakers rated
50 kA or 63 kA interrupting require special
expertise for replacement, and must be
replaced only by a qualified Siemens field
service representative. Accordingly, detailed
instructions for replacement of vacuum
interrupters for type GMSG circuit breakers
rated 63 kA interrupting and type GMSG-GCB
generator circuit breakers rated 50 kA or 63
kA interrupting are not provided in this
instruction manual.
Replacement vacuum interrupters are
furnished as a complete assembly, and have
been completely tested and mechanically
conditioned.
It is recommended one vacuum interrupter be
removed and replaced completely rather than
removing two or more vacuum interrupters at
a time.
The following procedure describes the
procedure for removing and replacing a
vacuum interrupter. Components may be
identified by referencing Figure 42: Vacuum
interrupter replacement illustration on page
56 and Figure 43: Illustration showing
required technique for fastening terminal-
clamp hardware on page 57.
Note: Special care needs to be exercised in
removal or installation of hardware around
the bottom, or movable contact end, of the
vacuum interrupter.
The movable contact uses a metal bellows to
maintain the vacuum seal while still
permitting up and down motion of the
contact. This metal bellows is rugged and
reliable, and is designed to withstand years of
vertical movement. However, care should be
exercised to avoid subjecting the metal
bellows to excessive torque during removal
and replacement. Twisting the metal bellows
through careless bolt removal or tightening
may damage the vacuum interrupter.
1.0 Removing the vacuum interrupter
1.1 Before starting work, the circuit breaker
should be isolated from all primary- and
control-power sources and all stored
energy discharged by tripping, closing
and tripping the circuit breaker by hand.
Discharge any static charge by
grounding both ends and the center
metal section of the vacuum interrupter.
Carefully remove outer-phase and inter-
phase barriers.
1.2 Loosen the lateral bolt(s) on terminal
clamp (29.2). Refer to Figure 43:
Illustration showing required technique
for fastening terminal-clamp hardware
on page 57 and employ the illustrated
procedure to loosen clamp hardware
(6 or 8 mm hex-key and 13 or 16 mm
socket).
1.3 Withdraw pin (48.5) from insulating
coupler (48.0) and levers (48.6).
1.4 Remove coupling pin from the eye bolt
(36.3).
1.5 Free struts (28.0) from the upper pole-
support (20.0). Loosen the strut
hardware on the lower support (40.0)
and swing the struts forward and
downward (16 mm open-end wrench
and 16 mm socket).
1.6 Loosen screws that secure the centering
ring (28.1) (10 mm open-end wrench).
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