Siemens 3AH 설치 운영 및 유지보수 - 페이지 19

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

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Vacuum Interrupter/Operator Description

Close coil (52SRC)

The close coil (3AY1510) is a standard component of the

circuit breaker which is used to unlatch the stored energy of

the closing spring and thus close the circuit breaker elec-

trically. It is available for both AC and DC operation. After

completion of a closing operation, the close coil is de-en-

ergized internally. If operated with AC voltage, a rectifier is

installed in the circuit breaker.

Trip coil (52T)

The trip coil (3AY1510) is a standard component of the circuit

breaker. The electrically supplied tripping signal is passed on

to the trip latching mechanism by means of a direct action

solenoid armature and the circuit beaker is thus opened. It is

available for both AC and DC operation. After completion of

an opening operation, the trip coil is de-energized internally.

If operated with AC voltage, a rectifier is installed in the

circuit breaker.

Indirect Releases (Secondary Shunt Release (Dual Trip)

(52T1) or Undervoltage (27))

The indirect release provides for the conversion of modest

control signals into powerful mechanical energy impulses.

It is primarily used to open medium voltage circuit breakers

while functioning as a secondary shunt release (dual trip) or

undervoltage device.

These releases are mechanical energy storage devices.

Their internal springs are charged as a consequence of

the circuit breaker mechanism operation. This energy is

released upon application or removal (as appropriate) of ap-

plicable control voltages. Refer to Figures 11, 12 and 13.

The Secondary shunt release and Undervoltage release

mounts to the immediate right of the trip coil (54.1).

Secondary Shunt Release (52T1) (Figure 11)

A secondary shunt release (extra trip coil) is used for electri-

cal opening of the circuit breaker by protective relays or

manual control devices when more than one trip coil is

required. The second trip coil is generally connected to a

separate auxiliary supply (DC or AC) from the control supply

used for the normal trip coil. Undervoltage Release (27)

(Figures 12 and 13).

Undervoltage Release (27) (Figures 10 and 11)

The undervoltage release (3AX1103) is used for continuous

monitoring of the tripping supply voltage. If this supply volt-

age falls excessively, the undervoltage release will provide

for automatic tripping of the circuit 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 hold-

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

to limit current when the normally open contact is closed.

Secondary shunt and undervoltage releases are available for

all standard ANSI control voltages.

11 21 25 27

1 Magnet core

3 Housing

5 Mounting holes (3)

7 Magnet coil

9 Magnet armature

11 Tension spring

13 Adjusting (Factory set)

screw for 11

Figure 11. Construction of Secondary Shunt Release (shown

charged).

Construction and Mode of Operation of Secondary

Shunt Release and Undervoltage Release (Figures 11,

12 and 13)

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 detach-

able cover and three through holes (5) for fastening screws.

The supply leads for the trip coil are connected to a terminal

block (33).

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), pivoted in the cover sheets of

the magnet armature (9). The armature (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 secondary shunt release 3AX1101

is energized by a trip signal, or if the tripping pin (15) is me-

chanically actuated, magnet armature (9) is swung against

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

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

by the spring (31).

15 Tripping pin

21 Locking pin

23 Striker pin

25 Latch

27 Spring

31 Striker pin spring

33 Terminal block

1294-94