Project_PrincipleOverview_G_YunNan_2025/ModeDisplay/Assets/StreamingAssets/SubTitles/原理/220kV断路器-燃弧熄弧.srt

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220千伏断路器

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采用气吹压力与开断电流自适应熄弧原理

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继承了压气式断路器的结构优点

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具有尽可能少的灭弧室零部件

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使产品具有高的电气可靠性

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触头和弧触头均采用一体烧结式铜钨触头

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具有良好的机械防变形

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和耐弧能力高 烧损较小 电寿命长

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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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动触头向下运动的同时

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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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对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.外加冷的高压气体可冲击冷却炙热的电弧

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4.以及动静触头分离的距离增大

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5.优良的适宜的电场特性

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使其开断感性电流几乎无截流过电压波形

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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

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消散

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从而完成了媳弧灭弧的功能