TRIP SOLENOID
Normal electrical tripping (opening} is caused
by
t
he
trip solenoid
(17,
Fig. 8} which is designated 52TC
on the schematic of Fig. 9. The trip solenoid is energized by operation of the circuit breaker control switch
1
or
the protective relays which are mounted on the switchgear.
CAPA CITOR TRIP DEVICE
A capacitor trip device is commonly used with circuit breakers having an ac control supply
installed in remote locations or unattended substations where battery cost and maintenance are
undesirable.
In these cases, the capacitor trip device may be charged from the same stepdown transformer
that is used to energize the breaker control. This stepdown transformer should be connected to
the
Ll
N E side of the breaker.
To apply the capacitor trip device to existing breakers originally shipped with de trip coils, contact your
Siemens-Allis sales representative.
CIRCUIT BREAKER OPERATION
Normal -
-
Normal circuit breaker operation is controlled by
c..u
bicle mounted controls or other
control devices. The closing springs of stored energy operated breakers will charge as soon as
the breaker control is energized. Check the motor cutoff adjustment
(Page
31}
if springs do
not charge.
Opening Breaker -- Stored energy operated breakers can be tripped manually by depressing the
trip rod
(44, Fig. 4b},
or electrically by energizing the trip circuit. This rotates the latch that
allows the closing linkage to collapse and reset.
Closing Breaker -- When the springs of a stored energy operated breaker are fully charged, it
can be closed by pulling the manual close pull
rod
(46, Fig. 4b),
or ele
ctr
i
c
a
ll
y by energizing
the closing circuit.
This rotates the latch
that allows the spri
n
gs to close the breaker.
Re
c
lo
s
i
n
g Control (Optional
-
For
Reclosing
Applications Only)
The trip latch check system
provides
the necessary
control
to perform the
reclosing function when
the switchgear is equipped with
reclosing
relays.
The system is
comprised of three elements; a magnetic actuator, a
non-contacting magnetically oper
ated hall effect switch
(sensor) and a timer module. The system performs
two distinct functions prior
to enabling the reclosing oper
ati
o
n
.
1.
It
senses that the trip latch has returned to its reset
position, and is
ready
to receive a
reclosing
operation.
2.
Imposes a delay following latch reset
to
insure
the
linkage assembly has
fully reset and then
applies power to the spring release coil.
-5-
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