[vc_row][vc_column][vc_custom_heading source="post_title" font_container="tag:h1|text_align:left|color:%231e73be"][vc_column_text]戶外跌落式熔斷器及拉負荷跌落式熔斷器是戶外高壓保護電器。它裝配在配電變壓器高壓側(cè)或配電線支干線路上，用作變壓器和線路的短路、過載保護及分合負荷電流。跌落式熔斷器由絕緣支架和熔絲管二部分組成，靜觸頭安裝在絕緣支架兩端，動觸頭安裝在熔絲管兩端，熔絲管由內(nèi)層的消弧管和外層的環(huán)氧玻璃管組成。拉負荷跌落式熔斷器增加彈性輔助觸頭及滅弧罩，用以分合負荷電流。

跌落式熔斷器在正常運行時，熔絲管借助熔絲張緊后形成閉合位置。當系統(tǒng)發(fā)生故障時，故障電流使熔絲迅速熔斷，并形成電弧，消弧管受電弧灼熱，分解出大量的氣體，使管內(nèi)形成很高的壓力，并沿管道形成縱吹，電弧被迅速拉長而熄滅。熔絲斷后，下部動觸頭失去張力而下翻，鎖緊機構(gòu)釋放熔絲，熔絲跌落，形成明顯的開斷位置，當需要拉負荷時，用絕緣桿開動觸頭，此時主動、靜觸頭仍然接觸，繼續(xù)用絕緣桿拉動觸頭，輔助觸頭也分離，在輔助觸頭之間產(chǎn)生電弧，電弧在滅弧罩狹縫中被拉長，同時滅弧罩產(chǎn)生氣體，在電流過零時，將電弧熄滅。[/vc_column_text][vc_column_text]

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