Siemens 3AH 사용 설명서 - 페이지 13

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1. Table of Contents

Vacuum Interrupter/Operator Description

Construction

The essential parts of the operating mecha nism are shown

in Figures 6a and 6b. The control and sequence of operation

of the mechanism is described in Figure

Motor Operating Mechanism (Figure 6a)

Th e spring ch arging motor (50.4) is bolted to the charg i n g

mechan ism (50.2) gear box instal led in t h e operator housing.

Neither the charging mech anism nor the motor require any

maintenance.

Mode of Operation

The operating mechanism is of the stored-energy trip free

type, i.e., the charging of the closing spri n g is not a utomati

cally followed by the contacts cha n g i n g position, a n d the

closing function may be overridden by an opening com

m and at any time.

When the stored-energy mechan ism has been charged, the

instant of operation can be chosen as d esired.

The mechanical energy for carrying out a n "open-close

open" sequence for auto-reclosing d uty is stored in the clos

ing and opening springs.

Charging

The details of th e closing spring cha rging mechanism are

shown in Figure 6a. The ch a rg i n g shaft is supported in the

charging mechanism (50.2), but is not coupled mech a n i

cally with the charg i n g mech a n ism. Fitted to it are the cra n k

(62.2) a t one end, and t h e c a m (62.3), together with lever

(62.5), at the other.

When the charging mechan ism is actuated by hand with

a hand crank (Figures 9a and 9b) or by a motor (50.4), the

flange (50.3) turns until the driver (50.3.1 ) locates itself in

the cutaway part of the cam d isc (62.3), th us causing the

charg i n g shaft to follow. The cra n k (62.2) charges the closing

spring (62). When the closing spring has been fully cha rged,

the cra n k actuates the linkage ( 55.1 ) via the control lever

(55.2) for the "closing spring cha rg e d " ind icator (55), a n d

actuates t h e li mit switches (50.4.1 ) f o r interrupting t h e motor

supply. At the same time, the lever (62.5) at the other end

of th e charg i n g shaft is secu rely locked by the latching pawl

(62 .5.2). Wh en the closi ng spring is being charged, cam disc

(62.3) fol lows idly, i . e., it is brought i nto position for closing.

Closing (Figures 6a, 6b and 7 a - 7 d)

If the circ u it breaker is to be closed locally, th e closing spri ng

is released by pressing the CLOSE button (53) . I n th e case

of remote control, the close coil 52SRC (53.1 ) unlatches th e

closing spring (62).

As the closing spring d ischarges, th e ch arging shaft (62.1 ) is

turned by crank (62.2). The cam d isc (62.3) at the other e n d

o f t h e charging shaft actuates t h e d rive lever (62.6), with th e

result that jack shaft (63) is turned by lever (63.5) via the trip

free cou pling rod (62.8). At the same time, the levers (63.1 ) ,

(63.5) a n d (63.7) fixed on t h e jack s h a ft operate the three in

sulating couplers (48) (Figure 5) for the circuit breaker poles.

Lever (63.7) cha nges the Open-close ind icator (58) over to

Open. Lever (63.5) charges the opening spring (64) d u r-

i n g closing, a n d the circuit breaker is latched in the closed

position by lever (64.3) with pawl rol ler (64.3.1 ) and by pawl

(64.2). Lever (63.1 ) actuates the a uxiliary switch (68) th rou g h

t h e linkage (68.1 ) .

Th e crank (62.2) o n the charg i n g shaft (62.1 ) moves the link

age (55.1 ) by acting on the control lever (55.2). The closing

spring charged ind ication is thus canceled, and the l imit

switches (50.4) switch in the control su pply to cause the

closing spri n g to recha rge immediately.

Trip Free Operation (Figures 6a and 6b)

The trip free coupling rod (62.8) permits th e immediate

decoupling of the d rive lever (62.6) a n d the jack s h aft (63) to

override closing action by trip command or by means of the

racking interlocks.

The trip free coupling rod (62.8) forms a link between the

drive lever (62.6) and the jack shaft (63). The rigidity of this

link depends upon a spring return latch (62.8.1 ) carried

within the coupling rod. The latch pivots within the cou pling

rod a n d is norm a l ly positioned to ensure the rigidity of the

coupling rod. Trip free coupling link (62.8.2) and trip free

coupling lever (62.8.3) cause the spring return latch posi

tion to be dependent upon the normal tripping components

and the racki ng i nterlock. Thus, whenever a trip com mand is

a pplied or th e circuit breaker is not in the fully CONNECT or

TEST position, th e trip free coupling rod is no longer rigid,

effectively decou pling the d rive lever and jack shaft. U nder

these conditions the vacuum interrupter contacts cannot be

closed.

Opening (Figure 6a)

If the circuit breaker is to be opened locally, the openi n g

spring (64) is released by pressing the Open pushbutton

(54). In the case of an electrical command being given, the

trip coil 52T (54.1 ) unlatches the opening spring (64).

The opening spring (64) turns the jack shaft (63) via lever

(63.5); the sequence being similar to that for closing.