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跌落式熔斷器利用懸落點(diǎn)可迅速滅弧
更新時(shí)間:2017-12-19   點(diǎn)擊次數:2401次
  跌落式熔斷器利用懸落點(diǎn)可迅速滅弧
  
  跌落式熔斷器運行原理
  
  跌落式熔斷器由絕緣體、上下防污罩、上下觸點(diǎn)、滅弧管等組成,滅弧管采用內插式,可360°旋轉安裝(克服同類(lèi)產(chǎn)品的安裝使用不便的缺點(diǎn)),雙點(diǎn)滅弧。當熔絲熔斷時(shí),利用懸落點(diǎn)可迅速滅弧,瞬間開(kāi)斷,形成明顯斷開(kāi)指示。
  
  跌落式熔斷器使用條件
  
  a、跌落式熔斷器基本使用條件:
  
  1)海拔高度:普通型不超過(guò)1000米。
  
  2)環(huán)境溫度不高于+40℃,不低于-40℃。
  
  b、跌落式熔斷器不適用于下述場(chǎng)所:
  
  1)有燃燒或爆炸危險場(chǎng)所。
  
  2)有劇烈震動(dòng)或沖擊場(chǎng)所。
  
  3)有導電化學(xué)氣體作用及嚴重臟污、鹽霧地區。
  
  跌落式熔斷器由上支架、熔管、下支架組成。當跌落式熔斷器處于正常運行狀態(tài)時(shí),跌落式熔斷器熔管下動(dòng)觸頭活動(dòng)關(guān)節閉鎖,熔管在上、下靜觸頭的壓力下處于合閘位置。當過(guò)載或短路電流熔斷熔絲時(shí),產(chǎn)生電弧,熔管隨之產(chǎn)生大量氣體形成高壓造成強烈縱吹。在電流過(guò)零時(shí),由于氣吹和去游離作用熄滅電弧,熔管在上、下靜觸頭的彈力和自重作用下跌落,形成明顯的隔離斷口,使電路斷開(kāi)。
  
  
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