Siemens 3AH Manual de instruções - Página 18
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Vacuum Interrupter/Operator Description
On the undervoltage release 3AX1103, the latch (25) is held
by the locking pin ( 2 1 ) as long as the armature (9) is ener
gized. If the circuit of the m a g n et coil (7) is interrupted, the
armature (9) d rops off, th us causing the latch (25) to lose its
support and release the striker pin (23).
Following every tripping operation, the striker pin (23) m ust
be reset to its normal position by loading the spring (3 1 ) .This
takes place automatically via the operating mecha nism of
the circuit breaker.
Since the striker pin of the undervoltage release 3AX1103 is
latched only when the armature is energ ized, the undervolt
age release is provided with a screw (29), for locking the
striker pin (23) in the normal position for adjusting purposes
or for carrying out trial operations d uring circuit breaker ser
vicing. Position A ( locked) d isables the undervoltage release.
Position B ( u n locked) is the normal operating position.
23
2 5
21
Figure 12. Latch Details (shown charged).
CapacitorTrip Device
The capacitor trip device is an a uxiliary tripping option
(capacitor trip is a system that should be mounted on the
drawout truck) providing a short term means of stori ng ad
equate electrical energy to ensure circuit breaker tripping.
This device is applied in circuit breaker instal l ations lack
ing i ndependent a uxiliary control power or station battery.
I n such installations, control power is usua lly derived from
the primary source. In the event of a primary source fault
or d isturbance the capacitor trip device will provide short
term tripping energy for circuit breaker opening due to relay
operatio n .
T h e capacitor trip converts 1 20 or 240 VAC control voltage
to a DC full wave voltage which is used to charge a large
capacitor to the peak of the converted wave.
(Figure 1 4).
Shock Absorber
Circuit breakers are equipped with a hydrau l ic shock ab
sorber (61.8) (Fig ure 6a). The purpose of this shock
Locl<edii.J rl ocked
Selection SC"ew
(Undervoltage Release Only)
absorber is to l imit overtravel and rebound of the vacuum
interrupter movable contacts during the conclusion of an
opening operation. The shock absorber action affects only
the end of an opening operation.
Auxiliary Switch ( 52 alb)
Figure 6a shows the circuit breaker mounted a uxiliary
switch (68). This switch provid es auxiliary contacts for
control of circuit breaker closing and opening functions.
Contacts are available for use in relaying and external logic
circu its. This switch is driven by l i n kage (68.1 ) connected
to the jack shaft (63). The auxiliary switch contains both 'b'
( Normally Closed) and 'a' ( N ormally Open ) contacts. When
the circuit breaker is open, the 'b' contacts are closed and
the 'a' contacts are open.
(88)
Spring Charging Motor
Spring charging motors (50.4) (Figure 6a) are ava ilable for
both AC and DC operation. If operated wit h AC voltage, a
rectifier is insta lled in the circuit breaker.
A:
Position
Locked
23 Strker pin
29
Scre.v
Position B
Unlocked
positiOn)
(O pe ratirg
Cancel Tt'e Lod< For Urdervdtage Reease By
St>ilti rg Loc�ng ScreN
Figure 1 3 U n dervoltag e Locked/U nlocked Selection.
120Vor
240V
AC
Supply
Figure 14. CapacitorTrip Device
(29)
From A To B
Capaclor
Trp Device
connection
For Source
Voltage:
120 V AC
240VPC
1 8