額定漏電不動作電流I△n0

家用漏電保護器在電路中出現(xiàn)規(guī)定值的漏電電流時應(yīng)該保證正常動作，也應(yīng)該在故障電流沒有達到規(guī)定值，保證不動作。這就是常被忽視的一個很重要的參數(shù)，各生產(chǎn)廠家在產(chǎn)品說明書中也常被遺忘。

●業(yè)從事（DCS系統(tǒng)）（機器人系統(tǒng)）（大型伺服控制系統(tǒng)）模塊 備件銷售廈門[泰尼電氣有

　　轉(zhuǎn)子流量計在工業(yè)生產(chǎn)過程中應(yīng)用較廣，可以測量多種介質(zhì)的流量，特別適用于中小管徑和低雷諾數(shù)的中小流量測量。轉(zhuǎn)子流量計結(jié)構(gòu)簡單，靈敏度高，量程比寬（10：1），壓力損失小且恒定，對直管段的要求不高，刻度近似線性，價格便宜，使用維護簡便。但儀表受被測介質(zhì)密度、粘度、溫度、壓力等因素的影響，其精度一般在1．5級左右。

從安全的角度來看，我們將額定動作電流I△n選的越小越好，但是任何供電線路和用電設(shè)備都具有正常的泄漏電流。雖然家用電器正常的絕緣電阻值在2.5MΩ以上，但導(dǎo)線對地、相線對零線、電器對地都存在分布電容，加上交流電壓后就形成了正常的泄漏電流。如果將家用漏電保護器的I△n0選的過小，小于線路正常的泄漏電流，那么供電線路就無法保證正常工作，即使投入運行也會經(jīng)常動作。影響用電設(shè)備和線路的正常泄漏電流有多種因素，其一由電源的外特性我們可知道，在夜間隨著用電負荷的下降，電源電壓就要上升，那么家中用電設(shè)備和線路的正常泄漏電流就隨之增加，造成漏電保護器動作斷電。這就是本文開始說故障之一。

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