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如何预防变(bian)频(pin)器(qi)出现(xian)(xian)凝露现(xian)(xian)象

日期(qi): 2021-09-23
浏览次(ci)数: 413

  回馈单元厂家提醒您:随着我国经济、社会和科学技术的高速发展,如今各行各业应用着大量的变频器。因为应用变频器的领域广泛,再加上我国幅员辽阔,所以有大量的变频器工作在异常潮湿的环境之中,比如安装在潮湿多雨的沿海地区和南方地区的变频器以及或安装在江河湖海和潮湿山地附近的风电机组变频器等。


  虽然(ran)变频(pin)器(qi)在(zai)(zai)这(zhei)些(xie)地(di)方可以正常运(yun)行,但是受空气湿度的(de)影响(xiang)(xiang),一(yi)(yi)旦(dan)工作环境温度产生(sheng)较(jiao)大变化,就有(you)可能出现(xian)凝露(lu)现(xian)象。这(zhei)会(hui)(hui)使(shi)得变频(pin)器(qi)功(gong)率器(qi)件、电(dian)路板等部位产生(sheng)一(yi)(yi)定量的(de)液态水,在(zai)(zai)与内部积累(lei)的(de)灰尘混合后,就会(hui)(hui)对其(qi)电(dian)气绝缘(yuan)造成影响(xiang)(xiang),严重(zhong)的(de)还(hai)会(hui)(hui)产生(sheng)通路,导(dao)致(zhi)出现(xian)故障,影响(xiang)(xiang)正常的(de)运(yun)行。


  凝露现象(xiang)会严重(zhong)影响和(he)威胁变(bian)(bian)频(pin)器(qi)的正常稳定运行,如(ru)果变(bian)(bian)频(pin)器(qi)工作(zuo)于(yu)潮湿(shi)环境中,特别(bie)是夏季多(duo)雨的南方,必须采(cai)取正确措施预(yu)防(fang)和(he)消除凝露现象(xiang)。目前,较(jiao)为常用的凝露预(yu)防(fang)方法只有两种,分别(bie)是温度控制法和(he)湿(shi)度控制法,前者旨在降低(di)相对温度,而(er)后者旨在降低(di)相对湿(shi)度。


  一(yi)、温度控制法


  预防凝露的形成,可以通过破(po)坏凝露形成条(tiao)件来实现(xian),由于(yu)变频器柜(ju)体(ti)内部(bu)相对(dui)封(feng)闭,若可以让柜(ju)体(ti)温度始终高(gao)于(yu)露点温度,就不(bu)会产生(sheng)凝露。现(xian)阶段主(zhu)要有(you)两种温度控(kong)制方案:


  1、通风(feng)口设置过(guo)滤器,能够(gou)杜绝大(da)量灰尘进入(ru)变(bian)频(pin)器内部(bu),确(que)保(bao)IP防护(hu)等级;为变(bian)频(pin)器设置加(jia)热器,一旦湿(shi)度(du)过(guo)大(da)即开(kai)始(shi)加(jia)热,温(wen)度(du)提升时就加(jia)大(da)通风(feng);从而确(que)保(bao)变(bian)频(pin)器内外始(shi)终保(bao)持一致的(de)空气相对湿(shi)度(du),温(wen)度(du)始(shi)终保(bao)持在正常的(de)范(fan)围之内。


  2、变(bian)频(pin)器内(nei)部(bu)冷(leng)却能(neng)力相对可(ke)控,确保柜内(nei)温(wen)(wen)度(du)(du)始终保持在一定(ding)的(de)范围之内(nei),当湿度(du)(du)超(chao)过阀值(zhi),就降低变(bian)频(pin)器的(de)散热(re)能(neng)力,通过变(bian)频(pin)器所产生的(de)功耗来提高(gao)变(bian)频(pin)器柜内(nei)温(wen)(wen)度(du)(du),从而杜绝(jue)凝(ning)露现(xian)象的(de)出现(xian);当温(wen)(wen)度(du)(du)超(chao)过阀值(zhi),就提高(gao)散热(re)能(neng)力,杜绝(jue)温(wen)(wen)度(du)(du)过高(gao)影响变(bian)频(pin)器的(de)正常运行。


  二、湿度控制法


  通过减少水汽(qi)含量,有效(xiao)降低空气相对湿度,从而(er)预防凝露现象的产生(sheng),主要包括以下三种方案:


  1、温差(cha)除湿法:在变频器(qi)内(nei)部(bu)安装(zhuang)有利于凝(ning)露(lu)(lu)的散(san)热(re)器(qi),从而(er)使(shi)得凝(ning)露(lu)(lu)仅形(xing)成于该散(san)热(re)器(qi)之上,从而(er)不会在变频器(qi)内(nei)部(bu)其他部(bu)位形(xing)成凝(ning)露(lu)(lu),散(san)热(re)器(qi)上形(xing)成的冷凝(ning)水通过出口向外排出,以便确保柜内(nei)始终保持相(xiang)对干燥(zao)的环境(jing)。


  2、吸附(fu)(fu)(fu)及膜(mo)式除湿法:在变频器(qi)柜内设置相(xiang)应的(de)(de)(de)吸附(fu)(fu)(fu)材料来起到水汽吸附(fu)(fu)(fu)的(de)(de)(de)目(mu)的(de)(de)(de),确保柜内始终(zhong)保持相(xiang)对(dui)(dui)干燥(zao)的(de)(de)(de)环(huan)境;也可以通过(guo)膜(mo)过(guo)滤器(qi)的(de)(de)(de)设置,来起到阻隔水汽的(de)(de)(de)目(mu)的(de)(de)(de),只(zhi)(zhi)让干空气通过(guo)过(guo)滤器(qi),使变频器(qi)内部只(zhi)(zhi)流入相(xiang)对(dui)(dui)干燥(zao)的(de)(de)(de)空气。


  3、冷凝除(chu)湿法:在变频器内(nei)部设置(zhi)温度最低点(dian),使得(de)凝露仅产生于该处,从而有效降低变频器内(nei)部的(de)(de)相对湿度,使得(de)变频器内(nei)部始终保持相对干燥(zao)的(de)(de)环境。

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从过(guo)去十(shi)几年(nian)电(dian)(dian)(dian)梯发展历(li)程来看(kan),我(wo)(wo)国电(dian)(dian)(dian)梯产量(liang)一(yi)直保持稳(wen)步增长,预(yu)计(ji)2018年(nian)增长速(su)度(du)在15%-20%之间(jian)。随着技(ji)术(shu)(shu)的(de)(de)(de)不断(duan)发展和(he)我(wo)(wo)国节(jie)(jie)能(neng)减(jian)排(pai)政策的(de)(de)(de)不断(duan)落实,电(dian)(dian)(dian)梯节(jie)(jie)能(neng)与安(an)全(quan)已经成为电(dian)(dian)(dian)梯发展的(de)(de)(de)方向,为配(pei)合《特种设(she)(she)(she)备(bei)安(an)全(quan)与节(jie)(jie)能(neng)事业(ye)发展“十(shi)三五”规划》的(de)(de)(de)实施(shi),各地(di)方政府(fu)纷(fen)纷(fen)出台电(dian)(dian)(dian)梯更换(huan)或(huo)改造(zao)(zao)计(ji)划,将到期(qi)需更换(huan)的(de)(de)(de)电(dian)(dian)(dian)梯通过(guo)更换(huan)或(huo)技(ji)术(shu)(shu)改造(zao)(zao)替换(huan)成节(jie)(jie)能(neng)电(dian)(dian)(dian)梯。  电(dian)(dian)(dian)梯在运行过(guo)程中安(an)全(quan)是最(zui)重要的(de)(de)(de),备(bei)用(yong)电(dian)(dian)(dian)系统(tong)的(de)(de)(de)使(shi)用(yong)尤为关键,它可(ke)以(yi)确保电(dian)(dian)(dian)梯在停(ting)电(dian)(dian)(dian)以(yi)及(ji)突发状(zhuang)况(kuang)时候可(ke)以(yi)正常运行,根据《居住区供(gong)(gong)配(pei)电(dian)(dian)(dian)设(she)(she)(she)施(shi)建设(she)(she)(she)标(biao)准》规定,多层(ceng)高层(ceng)的(de)(de)(de)住宅(zhai)用(yong)电(dian)(dian)(dian)属于一(yi)级负荷区域(yu),用(yong)电(dian)(dian)(dian)单位(wei)应(ying)(ying)自备(bei)应(ying)(ying)急电(dian)(dian)(dian)源(yuan)(yuan)(yuan)。但高层(ceng)建筑刚开始兴建时,对这块要求不够(gou)严格,很(hen)多高层(ceng)住宅(zhai)小区很(hen)少(shao)有(you)备(bei)用(yong)电(dian)(dian)(dian)源(yuan)(yuan)(yuan)或(huo)设(she)(she)(she)计(ji)双回路供(gong)(gong)电(dian)(dian)(dian),也少(shao)有(you)配(pei)备(bei)自用(yong)发电(dian)(dian)(dian)机的(de)(de)(de),双线供(gong)(gong)电(dian)(dian)(dian)设(she)(she)(she)施(shi)不多。“没有(you)备(bei)用(yong)电(dian)(dian)(dian)源(yuan)(yuan)(yuan),电(dian)(dian)(dian)梯运行会面临较大的(de)(de)(de)安(an)全(quan)隐患(huan)。”业(ye)内人士表示,在停(ting)电(dian)(dian)(dian)情况(kuang)下启(qi)动备(bei)用(yong)电(dian)(dian)(dian)源(yuan)(yuan)(yuan),能(neng)够(gou)使(shi)电(dian)(dian)(dian)梯恢复正常运行状(zhuang)态,而...
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