Project_PrincipleOverview_G_YunNan_2025/ModeDisplay/Assets/StreamingAssets/SubTitles/原理/500kV断路器-燃弧熄弧.srt

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该断路器采用双断口双灭弧装置

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加上并联电容的均匀分压

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让电压均匀分布到两个触头上

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灭弧室内充满优良灭弧和绝缘性能的六氟化硫气体

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分闸时通过压动气缸产生高压气体熄灭电弧

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它静动触头紧密插接

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动气缸的气缸喷头长于动触头

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静触头插入到动气缸中

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且和静气缸紧密连接

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当断路器分闸时

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两动触头向中心运动的同时

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带动动气缸一起运动

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随着气缸空间的缩小

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气缸里的六氟化硫气体被压缩

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首先分离的是动静触头

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分开瞬间由于距离小且电压高

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会击穿绝缘

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拉出电弧

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随着运动的继续

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当静触头离开动气缸时

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动气缸的密闭会被打开

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气缸里压缩的高压气体通过喇叭口气缸喷嘴

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形成爆炸式喷发

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1 由于六氟化硫气体具有高负性

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能够迅速吸收电子

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形成高浓度负离子空间

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阻碍了电子流通

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2 加上六氟化硫气体爆炸式横向冲击

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3 外加冷的高压气体冲击并冷却炙热的电弧

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4 以及动静触头分离的距离增大.

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5 并联电容对两触头电压的均匀分布

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可对分合闸瞬间

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感型负载形成的直流波形分量

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进行吸收消纳

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减少分合瞬间电压波形偏移

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可有效防止电弧复燃

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5个条件下

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当电流波形过零时

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电弧迅速熄灭 消散 从而完成了熄弧灭弧的功能