GE AK-1-15 Series - Page 21

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PAGE
05
Air
Circuit
Breaker
a
Type
AJ
£
~
X
~
XB
and
A
3
K
-
1
-
^
5
GFUU
1
&
G
7
miMCTTVE
iTRIPJMMO
LONG
TIME
DKXAY
TRIPPING
,
FIG
.
17
overcurrent
tripping
is
the
appliea
-
breakers
in
series
so
that
only
the
Selective
The
armature
(
ID
)
i
»
retained
by
the
ealltora
-
tlon
of
circuit
v
vion
opring
(
11
)
-
After
the
magnetic
foree
,
produced
circuit
formate
*
'
nearest
the
fault
opens
*
Any
one
or
by
an
overcurrent
condition
,
overcomes
this
re
-
combination
ol
two
or
more
of
the
preceding
over
-
straining
force
,
the
armature
movement
is
further
current
devices
may
be
used
in
a
selective
system
*
retarded
by
the
flow
of
sttieemo
oil
In
a
dashpot
,
The
?
?
r
«
aker
having
the
shorter
time
setting
and
which
produces
an
Inverse
time
delay
characteristic
*
lower
pickup
wW
trip
before
the
breaker
having
The
mechanism
is
shown
in
tins
right
side
view
of
the
longer
setting
ana
higher
pickup
,
provided
the
Fig
.
17
.
fault
is
on
the
part
of
the
line
protected
by
the
breaker
having
tlx
©
lower
setting
.
r
’
,
9
INSTANTANEOUS
TRIPPING
,
FIG
:
.
17
(
a
)
Adjustable
instantanetms
tripping
tokos
place
after
the
magnetic
force
produced
by
an
overcurrent
condition
,
overcomes
the
re
-
straining
force
of
tli
©
calibration
spring
which
can
bo
adjusted
by
the
calibration
clamp
nut
(
14
)
.
In
order
to
reduce
the
possibility
of
damaging
the
equipment
and
to
provide
maximum
safety
to
the
operator
,
the
overload
caused
by
a
fault
is
removed
In
a
minimum
amount
,
of
time
by
selective
tripping
,
producing
current
which
is
lees
than
the
short
timo
dolay
pichaip
are
removed
in
a
matter
of
a
few
seconds
,
while
currents
in
excess
of
this
value
are
removed
in
a
fraction
of
a
second
.
Overloads
(
b
)
Nonadjusteble
instantaneous
tripping
telms
For
the
exact
characteristics
and
setting
of
place
after
the
magnetic
force
produced
by
each
breaker
in
a
selective
system
,
merence
an
over
our
rent
condition
overcomes
tljo
should
be
main
to
the
coordination
chart
furnished
restraining
force
of
a
nonadjustabte
spring
,
for
the
parUmdar
system
.
fl
19
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Calibration
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paddle
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21
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