跌落式熔断器RW7-10/200

一、概述

跌落式熔断(duan)(duan)器(qi)(qi)及拉负荷跌落式熔断(duan)(duan)器(qi)(qi)是户外高压(ya)(ya)保护电(dian)(dian)(dian)器(qi)(qi)。它装置在(zai)配(pei)电(dian)(dian)(dian)变(bian)压(ya)(ya)器(qi)(qi)高压(ya)(ya)侧或(huo)配(pei)电(dian)(dian)(dian)线支干线路上、用作(zuo)变(bian)压(ya)(ya)器(qi)(qi)和(he)(he)线路的短路、过(guo)载保护及分、合负荷电(dian)(dian)(dian)流(liu)。跌落式熔断(duan)(duan)器(qi)(qi)由绝缘支架和(he)(he)熔丝管(guan)二部分组成(cheng)(cheng)，静触(chu)头安装在(zai)绝缘支架两端，动触(chu)头安装在(zai)熔丝管(guan)两端，熔丝管(guan)由内(nei)层(ceng)(ceng)的消弧管(guan)和(he)(he)外层(ceng)(ceng)的酚醛纸管(guan)或(huo)环氧(yang)玻璃(li)布管(guan)组成(cheng)(cheng)。拉负荷跌落式熔断(duan)(duan)器(qi)(qi)增强弹性辅助触(chu)头及灭弧罩，用以分，合负荷电(dian)(dian)(dian)流(liu)。

跌落式熔(rong)(rong)(rong)断(duan)器在正常运行时(shi)，熔(rong)(rong)(rong)丝(si)管(guan)借助(zhu)熔(rong)(rong)(rong)丝(si)张(zhang)紧后(hou)形(xing)成(cheng)闭合位置。当(dang)系统发生(sheng)故(gu)障时(shi)，故(gu)障电(dian)流(liu)时(shi)熔(rong)(rong)(rong)丝(si)迅速熔(rong)(rong)(rong)断(duan)，并形(xing)成(cheng)电(dian)弧(hu)，消弧(hu)管(guan)受电(dian)弧(hu)灼热，分解出大量(liang)的气(qi)体，使馆内形(xing)成(cheng)很高压力(li)(li)，并沿管(guan)道形(xing)成(cheng)纵(zong)吹，电(dian)弧(hu)被迅速拉(la)长而熄灭(mie)。熔(rong)(rong)(rong)丝(si)熔(rong)(rong)(rong)断(duan)后(hou)，下部动(dong)(dong)触(chu)(chu)头(tou)(tou)(tou)失去(qu)张(zhang)力(li)(li)二下翻(fan)，锁紧机(ji)械，释放(fang)熔(rong)(rong)(rong)丝(si)管(guan)，熔(rong)(rong)(rong)丝(si)管(guan)跌落，形(xing)成(cheng)明显的开断(duan)位置。当(dang)需要拉(la)负荷时(shi)，用绝缘杆拉(la)开动(dong)(dong)触(chu)(chu)头(tou)(tou)(tou)，此时(shi)主动(dong)(dong)、静动(dong)(dong)触(chu)(chu)头(tou)(tou)(tou)仍然接触(chu)(chu)，继续(xu)用绝缘杆拉(la)动(dong)(dong)触(chu)(chu)头(tou)(tou)(tou)，辅(fu)助(zhu)触(chu)(chu)头(tou)(tou)(tou)也分离，在辅(fu)助(zhu)触(chu)(chu)头(tou)(tou)(tou)之间(jian)产生(sheng)电(dian)弧(hu)，电(dian)弧(hu)在灭(mie)罩狭缝中(zhong)被拉(la)长，同(tong)时(shi)灭(mie)弧(hu)罩产生(sheng)气(qi)体，在电(dian)流(liu)过零时(shi)，将电(dian)弧(hu)熄灭(mie)。 

二、用途

户外跌落式(shi)熔断器(qi)适用(yong)于35kv及以下电(dian)压频率(lv)50Hz电(dian)力系统中，作输电(dian)线路、电(dian)力变压器(qi)过载和短路保护，分合额定负荷(he)电(dian)流只用(yong)，机械寿命(ming)≥2000次。 

三、使用条件

1.适用于环境温度上限(xian)(xian)40℃，下限(xian)(xian)-30℃之内(nei)。

2.海拔不超过(guo)1000m，风速不大于35m/s

3.熔断器不适用于下述(shu)场(chang)所

3.1有燃料(liao)或(huo)爆炸危险的场(chang)所。

3.2有剧烈震动或冲击的场所。

3.3有异电(dian)化(hua)学气体作(zuo)用(yong)及严重空气污秽，烟雾地区。 

四、结构简介

熔断(duan)(duan)器(qi)是由基座和消弧装置两大部分组(zu)成，灭弧管下端装有可能转动的弹簧支架，始终使熔丝处于紧张状(zhuang)态，以保证灭弧管在合闸位置的自(zi)锁，线(xian)路(lu)与变压器(qi)过载或短路(lu)中，熔丝熔断(duan)(duan)，熔丝迅速从灭弧管中抽(chou)出，灭弧管设计为逐级(ji)排气式解决(jue)在同一熔断(duan)(duan)器(qi)上开断(duan)(duan)大小(xiao)电流的矛盾。