Breaker Tripping Signal, Cut-Out Switches (S6 And S7); Varistor Module (V1 To V3); Electrical Local Closing/Electrical Interlocking; Mechanical Interlocking - Siemens 3AH3 Operating Instructions Manual

Breaker tripping signal, cut-out switches (S6
and S7)
When the vacuum circuit-breaker is tripped by means
of a release, the position switch S6 briefly makes
contact. This contact making can be used for signalling.
In the event of intentional mechanical tripping, the cut-
out switch S7 breaks this contact.
Varistor module (V1 to V3) 3AX1526
The disconnection of inductive loads in DC circuits may
cause switching overvoltage which pose a risk to
electronic control units. In order to prevent this, the
inductances of the circuit-breaker mechanism and
control (motor, closing solenoid, shunt release and
auxiliary contactor) can be connected to varistor (with
DC operation). For rated operating voltage of 60V to
220V DC the varistor module 3AX1526 is available as
an accessory; it limits the overvoltage to about 500V.
The module contains 2 separate varistor circuits.

Electrical local closing/electrical interlocking

In the basic version, the closing spring must be
released mechanically if the breaker is to be closed
locally. A version with electrical local closing can also
be supplied. In this version, the making circuit of the
circuit-breaker is activated electrically via a push-button.
In this way, allowance can also be made for
station-specific interlocks, and undesired making
operations prevented. For example, interlocking of the
circuit-breaker is possible via the auxiliary contact of a
disconnector.
Circuit-breaker with electrical local closing cannot be
closed mechanical.

Mechanical interlocking

Operating mechanism of disconnectors can be fitted
with a mechanical switchgear interlocking facility. The
disconnector and the associated circuit-breaker are in
this case interlocked mechanically.
The sensing parts check the switch position of the
circuit-breaker and prevent if from closing mechanically
and electrically if the associated disconnector is not in
a position to allow safe operation. On the other hand,
the disconnector is prevented from being operated
when the circuit-breaker is closed.
The mechanical interlocking facility can also be used to
interlock breaker trucks or draw-out breaker parts.
Adjustment instruction: 3G 460 00127 (3AX 1520-3C)
Dimensions and weight
The dimensions and weights of the vacuum circuit-
breaker are shown in the relevant drawings.
For planning purposes, the drawings showing detailed
overall dimensions, can be ordered through the
appropriate Siemens agency.
The weight is also stated on the breaker rating plate.
1) Can be ordered on request, retrofitting possible.
Operating Instruction Siemens 3AH3 / 西门子 3AH3 真空断路器使用手册
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分闸脱扣信号 S6 和信号消除开关 S7
当断路器分闸是由于脱扣装置引起时, 位置开关 S6 会短
时闭合, 这可以作为脱扣跳闸信号. 在正常机械分闸时,
信号消除开关 S7 首先断开.
压敏电阻模块 (V1 to V3) 3AX1526
切断直流感性负荷时可能会产生危害控制线路中电子元
件的操作过电压. 为防止这一危害, 断路器机械和控制部
分中的感性元件 (电动机, 合闸线圈, 分励脱扣器以及辅
助接触器可以接有压敏电阻 (直流操作时). 3AX1526 压
敏电阻模块可用于直流 60V-220V; 它可以把过电压
限制在 500V 左右.该模块由两个独立的压敏电阻回路组
成.
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电气就地合闸/电气联锁
在基本配置中, 如要求断路器就地合闸, 则必须运用机械
合闸. 本产品还可以提供电气就地合闸装置. 这个装置
利用一个按钮以实现断路器电气合闸. 通过这个装置还可
以实现电站的某些特殊联锁. 例如, 通过隔离开关的辅助
触点完成断路器与其的联锁.
带有电气就地合闸的断路器不具有机械合闸功能.
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机械联锁
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隔离开关的操动机构可以装有一套机械联锁装置. 这套
装置将隔离开关与其相关的断路器用机械方法加以联锁.
机械联锁的探头部分可以辨别断路器的合,分位置, 如果
与断路器相关的隔离开关的闸刀处于不能确保安全操作
的位置时, 断路器就不能闭合. 另一方面, 当断路器处于
合闸状态, 联锁装置可阻止操作隔离开关.
机械联锁装置还可用于断路器手车或可移开部分的联锁.
调节指示: 3G 460 00127 (3AX 1520-3C)
外形尺寸及重量
真空断路器的外形尺寸及重量可以在相应图中查到.
考虑布置方案时, 可以向西门子公司的合法代理商定购
详细的总体外形尺寸图.
重量可在断路器铭牌上查到.
1) 可按需定购, 改装也可能实现.
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