Siemens 3AH Руководство по эксплуатации - Страница 18

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1. Table of Contents

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.

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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.

Position

Locked

23 Strker pin

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

Supply

Figure 14. CapacitorTrip Device

(29)

From A To B

Capaclor

Trp Device

connection

For Source

Voltage:

120 V AC

240VPC

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