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多断口爆炸气流灭弧防雷间隙灭弧试验

DOI: 10.13336/j.1003-6520.hve.2015.04.034, PP. 1328-1333

Keywords: 多断口,爆炸气流,灭弧防雷间隙,电弧,输电线路,灭弧时间

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Abstract:

多断口爆炸气流灭弧防雷间隙是一种主要针对10kV电压等级输电线路的新型灭弧防雷装置。为研究其灭弧能力,利用短路发电机提供5kA最大工频电流,对其灭弧过程进行了试验。试验现象说明爆炸气流能够强烈干预电弧,在短时间内将电弧迅速拉长并吹出陶瓷管外,加快电弧等离子体热游离和电弧能量的扩散,瞬间冷却并熄灭电弧。试验结果表明从装置触发到灭弧结束历时70μs左右,其中从气流接触电弧到电弧熄灭的时间小于10μs,并且有TNT装置的灭弧效果要明显优于无TNT的装置,装置触发后产生的高速气流能够维持时间为600μs,强烈作用于电弧生成的初始阶段,实现对电弧的长久抑制,不会出现残压和电弧重燃现象,而且此装置能经受50次65kA大电流冲击或20次100kA大电流冲击。证明多断口爆炸气体灭弧防雷间隙装置能切实保证供电可靠性,保障电网的正常运行。

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