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Power Circuit Breokers,
GEK-7310
RECEIVING,
HANDLING, AND
STORAGE
RECEIVING
AND
HANDLING
Each
breaker
is carefully
inspected and packed
before
shipment.
Immediately
upon
receipt of
the
circuit breaker,
an
examination should be made
for
anydamage
sustainedin
transit.
If damage
or
rough
handling
is
evident, a
damage
claim
should
be
filed
immediately
with
the
transportation
company
and
the
nearest
General
Electric
Sales Office should
be
notified.
It is
expected
that due care
will
be
exercised
during
unpacking and
installation of
the
breaker
so
that no
damage
wi.ll occur from
careless or rough
handling,
or
from
exposure
to
moisture
or
dirt.
Check
all
parts
against
the
packing
list to
be sure
that no
parts
have been
overlooked.
STORAGE
It
is
recommended that
the breaker be put
into
service immediately in
its
permanent
location. If
this is
not
possible,
the
following precautions must
betakento insuretheproper storage of
the
breaker:
1. The breaker
should
be carefully
protected
against condensation, preferably by storing
it
in
a
warm dry
room,
since
water
absorption has an ad-
verse effect
on
the insulation
parts.
Circuit break-
ers for
outdoor
switchgear should be stored in
the
equi.pment
only when
power
is
available and
the
heaters
are
in
operation
to
prevent
condensation.
2.
The breaker should be stored in a clean lo-
cation free from
corrosive
gases
or
fumes.
Par-
ticular
care
shouldbe
taken to
protect the
equipment
from moistwe
and
cement dust,
as
this
combination
has
a
very corrosive effect
on many
parts.
CAUTION:
IF
THE BREAKER IS STORED
FOR ANY LENGTH
OF
TIME,IT
SHOULD
BE
INSPECTED
PERIODICALLY TO
SEE
THAT
RUSTING
HAS NOT STARTED AND
TO ASSURE GOOD
MECHANICAL
CON-
DITION. SHOULD THE BREAKER
BE
STORED UNDER UNFAVORABLE AT-
MOSPHERIC CONDITIONS,
IT
SHOULD
BE
CLEANED AND
DRIED
OUT
BEFORE
BEING PLACED
IN
SERVICE.
BREAKER OPERATION
PUTTING THE
BREAKER
IN
SERVICE
DRAWOUI
BREAKERS
The mechanism used
to
provide
the mechanical
force required
to overcome the
resisting
force of
the
disconnects
on Type
AKR
breakers
is
mounted
onthebreaker rather than in the drawout enclosure.
This
mechanism
is
referred to
as
the "drawout"
mechanism
or
the "racking" mechanism.
It is
a
unit
subassembly and can be
added
to a completely
assembled
breaker without doing any disassembly
work
on the
breaker.
This
drawout mechanism consists
of a
crank-
shaft
and
a power
screw which operates
it.
Rigidly
fastened
to
each end
of
the crankshaJt
is
a
crank
arm
having
an open
slot which
engages a
fixed pin
in the equipment
enclosure.
As the crankshaJt
ro-
tates,
the
crank arms, acting
on
the stationary pin,
cause
the
breaker
to move
with
respect
to
the
breaker
enclosure.
The
crankshaft
is
driven
as
the power
screw
is
turned in
an
internally
threaded trunnion
supported
by
a
centrally
located
crank
on
the
crank-
shaft.
The power screw,
or
jackscrew,
is
turned
by
means
of
an external handle
in
the
form of
a
crank.
This has,
on
its
end, a square socket which
will
engage
the square end of the power screw
in
the
breaker. A sliding
cover
in
the
escutcheon must
be moved aside
so
that
the
handle
may
engage
the
screwshaft
end. Turning the crank
handle
in
a
clockwise
direction
moves the
breaker into the
con-
nected
position.
The reverse
of
this
causes
the
breaker to move
out.
BREAKER
|NSERI|ON (FtG. 3)
The procedure
for
inserting a breaker into its
drawout enclosure
is
as
follows:
1. Before inserting
the breaker, apply
a
light,
even
coating of D50H47 grease to the silver-plated
bars inthe enclosure whichengagethe primary dis-
connects of the
breaker.
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