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一、概述

    跌落(luo)式(shi)熔(rong)(rong)斷(duan)器(qi)及拉負(fu)(fu)(fu)荷跌落(luo)式(shi)熔(rong)(rong)斷(duan)器(qi)是戶外高壓保護(hu)電(dian)(dian)器(qi)。它裝(zhuang)置(zhi)在(zai)(zai)配(pei)電(dian)(dian)變壓器(qi)高壓側或配(pei)電(dian)(dian)線支干線路(lu)上、用作變壓器(qi)和(he)線路(lu)的(de)短路(lu)、過(guo)載保護(hu)及分(fen)(fen)、合(he)負(fu)(fu)(fu)荷電(dian)(dian)流。跌落(luo)式(shi)熔(rong)(rong)斷(duan)器(qi)由絕緣支架和(he)熔(rong)(rong)絲(si)管二部分(fen)(fen)組成，靜觸頭(tou)安裝(zhuang)在(zai)(zai)絕緣支架兩(liang)端(duan)，動(dong)觸頭(tou)安裝(zhuang)在(zai)(zai)熔(rong)(rong)絲(si)管兩(liang)端(duan)，熔(rong)(rong)絲(si)管由內層的(de)消弧管和(he)外層的(de)酚醛紙管或環氧玻璃布(bu)管組成。拉負(fu)(fu)(fu)荷跌落(luo)式(shi)熔(rong)(rong)斷(duan)器(qi)增強彈性輔助觸頭(tou)及滅弧罩，用以分(fen)(fen)，合(he)負(fu)(fu)(fu)荷電(dian)(dian)流。

    跌落(luo)(luo)式(shi)熔(rong)(rong)(rong)(rong)斷器在(zai)正常(chang)運行時(shi)(shi)，熔(rong)(rong)(rong)(rong)絲管借助熔(rong)(rong)(rong)(rong)絲張緊后(hou)形成(cheng)閉合位(wei)置(zhi)。當系統發生(sheng)(sheng)故(gu)障時(shi)(shi)，故(gu)障電(dian)(dian)流時(shi)(shi)熔(rong)(rong)(rong)(rong)絲迅(xun)速(su)熔(rong)(rong)(rong)(rong)斷，并(bing)形成(cheng)電(dian)(dian)弧(hu)(hu)，消弧(hu)(hu)管受(shou)電(dian)(dian)弧(hu)(hu)灼熱，分(fen)解出大量的(de)氣(qi)體(ti)，使館內形成(cheng)很高壓力(li)，并(bing)沿(yan)管道形成(cheng)縱吹，電(dian)(dian)弧(hu)(hu)被迅(xun)速(su)拉長(chang)而(er)熄滅(mie)(mie)。熔(rong)(rong)(rong)(rong)絲熔(rong)(rong)(rong)(rong)斷后(hou)，下(xia)部(bu)動(dong)(dong)觸(chu)(chu)頭(tou)(tou)失去張力(li)二下(xia)翻，鎖(suo)緊機械(xie)，釋放熔(rong)(rong)(rong)(rong)絲管，熔(rong)(rong)(rong)(rong)絲管跌落(luo)(luo)，形成(cheng)明顯的(de)開(kai)斷位(wei)置(zhi)。當需要拉負荷時(shi)(shi)，用(yong)絕(jue)緣桿拉開(kai)動(dong)(dong)觸(chu)(chu)頭(tou)(tou)，此時(shi)(shi)主動(dong)(dong)、靜動(dong)(dong)觸(chu)(chu)頭(tou)(tou)仍然接觸(chu)(chu)，繼續用(yong)絕(jue)緣桿拉動(dong)(dong)觸(chu)(chu)頭(tou)(tou)，輔(fu)助觸(chu)(chu)頭(tou)(tou)也(ye)分(fen)離，在(zai)輔(fu)助觸(chu)(chu)頭(tou)(tou)之間產生(sheng)(sheng)電(dian)(dian)弧(hu)(hu)，電(dian)(dian)弧(hu)(hu)在(zai)滅(mie)(mie)罩(zhao)狹(xia)縫中(zhong)被拉長(chang)，同時(shi)(shi)滅(mie)(mie)弧(hu)(hu)罩(zhao)產生(sheng)(sheng)氣(qi)體(ti)，在(zai)電(dian)(dian)流過零時(shi)(shi)，將電(dian)(dian)弧(hu)(hu)熄滅(mie)(mie)。

二、用途

    戶(hu)外高(gao)壓(ya)熔斷器適用于35kv及以下(xia)電(dian)(dian)壓(ya)頻(pin)率50Hz電(dian)(dian)力系統(tong)中，作輸電(dian)(dian)線路、電(dian)(dian)力變壓(ya)器過載(zai)和短(duan)路保護，分(fen)合額定負荷電(dian)(dian)流只(zhi)用，機械(xie)壽命≥2000次。

三、使用條件

1.適用于環境溫度上(shang)限(xian)40℃，下限(xian)-30℃之內(nei)。

2.海(hai)拔不超過1000m，風速不大于35m/s

3.熔斷器不(bu)適用于下(xia)述場所

3.1有燃(ran)料或爆炸危(wei)險的(de)場所(suo)。

3.2有劇烈震動(dong)或沖擊(ji)的場所。

3.3有異電(dian)化學(xue)氣體(ti)作用及嚴(yan)重(zhong)空氣污穢(hui)，煙霧地區(qu)。

四、結構簡介

    熔(rong)斷(duan)器是(shi)由基(ji)座和消(xiao)弧裝(zhuang)置兩大部(bu)分組成，滅弧管(guan)下端裝(zhuang)有可(ke)能轉動的彈簧(huang)支架，始終使熔(rong)絲(si)處于緊張狀態，以保證(zheng)滅弧管(guan)在合閘(zha)位置的自鎖(suo)，線路(lu)與變壓器過(guo)載或短路(lu)中(zhong)，熔(rong)絲(si)熔(rong)斷(duan)，熔(rong)絲(si)迅速(su)從滅弧管(guan)中(zhong)抽出，滅弧管(guan)設計為逐級排氣式解決在同一熔(rong)斷(duan)器上開斷(duan)大小電流(liu)的矛盾。

五、型(xing)號說(shuo)明

六(liu)、主要(yao)技術參數

七(qi)、外(wai)形及安裝尺寸