Undervoltage Release; Ct-Operated Release - Siemens 3AH3 Operating Instructions Manual

Shunt release (Y2) 3AX1101
The 3AX1101 shunt release is fitted if more than one
shunt release is required. With its design, the electrical
opening command is transferred in boosted form to the
"Open" latching mechanism via a solenoid armature
through unlatching of a energy store and thus the
circuit-breaker is opened. Any varistors and rectifiers
required are integrated in the release.
Power consumption: <60W or <55VA
Undervoltage release (Y7) 3AX1103
Undervoltage release consist of a stored-energy
mechanism, an unlatching mechanism and an
electromagnet system which is connected continuously
to the supply when the circuit-breaker is in the close
state. If this voltage drops to below a certain value the
unlatching mechanism is released and opening of the
circuit-breaker is thus initiated via the stored-energy
mechanism.
The deliberate tripping of undervoltage release
generally takes place via an NC contact in the tripping
circuit. But it can also be carried out via an NO contact
by short-circuiting of the magnet coil. With this type of
tripping, the short-circuit current is limited by the built-in
resistors (see circuit diagram Fig.3/4)
Under voltage releases can also be connected to
voltage transformers. When the operating voltage
drops to impermissibly low levels, the circuit-breaker is
tripped automatically.
Power consumption: <6.5 W or <7.5 VA
CT-Operated release (Y4) 3AX1102
CT-operated releases consist of a stored-energy
mechanism, an unlatching mechanism and an
electromagnet system. When the tripping current is
exceeded (90% of the CT-operated release rated
current) the unlatching device of the stored-energy
mechanism is released and thus opening of the circuit-
breaker is initiated. In addition to the primary current
transformer, matching transformers are required for
application of the CT-operated releases.
Power consumption for 0.5A and 1A<6VA at 90% of
the rated current and with open armature.
CT-operated release (Y6) 3AX1104
(Low-energy release 0.1Ws)
In connection with a solid-state release (7SJ41
overcurrent time protection or similar) and low-power
primary current transformers (window-type
transformers), it is possible with the 3AX1104 to create
a CT-operated release without additional supply
voltage.
The 3AX1104 is of similar design as the 3AX1101
/1102 releases. With its coil data and its low energy
requirement of < 0.1Ws, its designend to be directly
actuated by a release impulse provided by a capacitor
of the above-mentioned electronic release systems.
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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分励脱扣器 (Y2) 3AX1101
当需用不止一个脱扣器时, 则安装 3AX1101 分励脱扣器.
使用该脱扣器时, 电气分闸指令以放大形式传给线铁芯,
然后打开储能元件的锁扣系统, 将断路器分闸.所有必需
的变阻器和整流模块在分励脱扣器中被集成化.
功率消耗最大值: <60W 或<55VA
欠电压脱扣器 (Y7) 3AX1103
欠电压脱扣器由一套储能机构, 解锁机构以及电磁系统
构成, 当断路器处于闭合状态时, 该电磁系统与电源相连
接. 当电源电压降低至某一树值时, 解锁机构释放, 通过
弹簧储能机构将断路器分断.
这种精巧的欠电压脱扣器装置通常通过接在脱扣回路中
的一个常闭触点来动作. 但是也可以用短接其电磁线圈的
方式使用一常开触点, 短路电流由装置内的电阻限制( 见
图 3/4)
欠电压脱扣器还可以安装在电压互感器上, 当工作电压
降到允许值以下时, 断路器自动脱扣.
功率消耗约: <6.5 W 或<7.5 VA
电流互感器驱动型脱扣器 (Y4) 3AX1102
电流互感器驱动型脱扣器由一套储能机构, 解锁
机构以及电磁系统构成. 当脱扣电流超过脱扣器额
定脱扣电流的 90%时, 储能机构的解锁装置脱扣, 然后断
路器实现分闸. 除了电流互感器之外, 这种脱扣器还需配
用一个耦合变压器.
对于 0.5A 和 1A 两种规格, 当脱扣电流为 90%额定脱扣
电流时, 且脱扣器带有运动铁芯时, 功率消耗为<6VA
电流互感器驱动型脱扣器 (Y6) 3AX1104
(低能脱扣器 0.1Ws)
把电子脱扣器 (类似 7SJ41 过流时间保护或其他)和
低功率初级电流互感器(窗式互感器)相连, 就可以和
3AX1104 形成一个无需附加电源的电流互感器驱动
型脱扣器.
3AX1104 与 3AX1101/3AX1102 脱扣器的设计非常
相似. 根据线圈参数以及<0.1Ws 的低能耗要求, 它可以
由上述电子脱扣系统中的一个电容所提供的脱扣脉冲信
号直接动作.
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