Siemens 3AH 지침, 설치, 작동, 유지보수 - 페이지 14

{카테고리_이름} Siemens 3AH에 대한 지침, 설치, 작동, 유지보수을 온라인으로 검색하거나 PDF를 다운로드하세요. Siemens 3AH 33 페이지. Vacuum circuit breaker operator module
Siemens 3AH에 대해서도 마찬가지입니다: 설치 운영 및 유지보수 (20 페이지), 사용 설명서 (38 페이지)

페이지 인쇄

1. Maintenance and Troubleshooting

Interrupter/Operator Description

Undervoltage Release

The undervoltage release is used for continuous monitor-

ing of the tripping supply voltage. If this supply voltage

falls excessively, the undervoltage release will provide for

automatic tripping of the breaker.

The undervoltage device may be used for manual or relay

tripping by employing a contact in series with undervoltage

device holding coil. Relay tripping may also be achieved

by employing a normally open contact in parallel with the

holding coil. If this scheme is used, a resistor must be

provided to limit current when the normally open contact

is closed.

Secondary and undervoltage releases are available for all

standard ANSI control voltages.

Construction and Mode of Operation of Secondary

Release and Undervoltage Release

(See Figures 9, 10 and 11)

The release consists of a spring-power storing mechanism,

a latching device, and an electromagnet. These elements

are accommodated side by side in a housing (3), with a

detachable cover and three through holes (5) for fastening

screws. The supply leads for the trip coil are connected to

a terminal block (33). Two lugs (17) are provided beside

the tripping pin (15) for the attachment of a manual trip-

ping lever.

The energy-storing mechanism consists of the striker pin

(23) and its operating spring (31), which is mostly located

inside the striker pin (23). When the spring is compressed,

the striker pin is held by a latch (25), whose sloping face is

forced against the appropriately shaped striker pin (23) by

spring (27). The other end of the latch (25) is supported by

a partly milled locking pin (21) (see Figure 9), pivoted in

the cover sheets of the magnet armature (9). The arma-

ture (9) is pivoted in front of the poles of the U-shaped

magnet core, (1) and is pulled away from it by the tension

spring (11).

If the magnet coil (7) of the shunt release 3AX1101 is ener-

gized by a trip signal, or if the tripping pin (15) is mechani-

cally actuated, magnet armature (9) is swung against the

pole faces. When this happens, the latch (25) loses its sup-

port and releases the striker pin (23), which is forced out

by the spring (31).

On the undervoltage release 3AX1103, the latch (25) is held

by the locking pin (21) as long as the armature (9) is at-

tracted (See Figure 10). If the circuit of the magnet coil (7)

is interrupted, the armature (9) drops off, thus causing the

latch (25) to lose its support and release the striker pin (23).

Following every tripping operation, the striker pin (23) must

be reset to its normal position by loading the spring (31).

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 attracted, this trip is

provided with a screw (29) (see Figure 11), for locking the

striker pin (23) in the normal position for adjusting pur-

poses or for carrying out trial operations during breaker

servicing. Position A (blocked) disables the undervoltage

release. Position B is the normal (operating) position.

11 21

25 27

Magnet core

Housing

Mounting holes (3)

Magnet coil

Magnet armature

11 Tension spring

13 Adjusting screw for 11

Figure 9. Construction of Shunt Release (shown released)

Capacitor Trip Device

The capacitor trip device is an auxiliary tripping option (ca-

pacitor trip is a system that should be mounted on the

drawout truck) providing a short term means of storing

adequate electrical energy to ensure breaker tripping.

This device is applied in breaker installations lacking inde-

pendent auxiliary control power or station battery. In such

installations, control power is usually derived from the pri-

mary source. In the event of a primary source fault, or

disturbance with attendant depression of the primary

source voltage, the capacitor trip device will provide short

term tripping energy for breaker opening due to relay op-

eration.

The capacitor trip converts 120 or 240 VAC control volt-

age to a DC full wave voltage which is used to charge a

large capacitor to the peak of the converted wave. See

Figure 12.

15 Tripping pin

21 Locking pin

23 Striker pin

25 Latch

27 Spring

31 Striker pin spring

33 Terminal block

1294-94