Vacuum Interrupters - Siemens 3AH3 Operating Instructions Manual

Vacuum interrupters

The basic construction of the vacuum interrupters for
the 3AH3 vacuum circuit-breaker is shown in the
sectional view in Fig.2/5.
Depending on its type, the vacuum interrupter (30.) is
fixed to the upper interrupter support (20.). The arcing
chamber (33.) is located between two ceramic insulator
(32.). The fixed contact piece (31.) is connected
directly with the housing. The moving contact piece
(36.) is fixed to the terminal bolt (36.1) and is located
centrally in the guide (35.). The metal bellows (34.)
forms the vacuum-proof connection to the interrupter
housing.
Fig.2/5 vacuum interrupter
图. 2/5 真空灭弧室
The vacuum interrupters fitted in the 3AH3 vacuum
circuit-breaker are type-approved in accordance with
the X-ray regulations of the Federal Republic of
Germany. They conform to the requirements of the X-
ray regulations of January 8, 1987 (Federal LAW
Gazette Page 144) § 8 and annex Ш section 5 up to
rated short-time AC voltage stipulated in accordance
with DIN VDE/IEC.
Operating Instruction Siemens 3AH3 / 西门子 3AH3 真空断路器使用手册
真空灭弧室
3AH3 真空断路器灭弧室的基本结构的剖面如图 2/6.
依照这种结构, 真空灭弧室 (30) 由上支撑(上极帽) (20.)
固定. 金属灭弧室 (33.) 位于上下瓷绝缘外罩
之间.静触头 (31.) 与灭弧室外壳固定在一起. 动触头
(36.) 与动触头杆 (36.1) 相连并且位于导向管 (35.)
中央玻纹管 (34.) 与灭弧室形成密封保护连接.
装于 3AH3 真空断路器的灭弧室是经过型式试验考核的,
符合德国对于 X 射线计量的规定. 并满足 (联邦法律公报
144 页) 第 5 章第 Ш 部分第 8 款关于按照 DIN VDE/IEC
标准中规定在额定短时交流电压下 X 射线的要求.
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