在(zai)通(tong)信(xin)電(dian)源(yuan)係(ji)統(tong)中(zhong),市(shi)電(dian)中(zhong)斷(duan)後(hou),閥(fa)控(kong)鉛(qian)蓄(xu)電(dian)池(chi)應(ying)立(li)即(ji)由(you)浮(fu)充(chong)狀(zhuang)態(tai)轉(zhuan)入(ru)放(fang)電(dian)狀(zhuang)態(tai),以(yi)保(bao)通(tong)信(xin)設(she)備(bei)的(di)直(zhi)流(liu)電(dian)源(yuan)不(bu)間(jian)斷(duan)。
(1)放(fang)電(dian)特(te)性(xing)
采(cai)用(yong)各(ge)種(zhong)不(bu)同(tong)放(fang)電(dian)速(su)率(shuai)時(shi)，閥(fa)控(kong)鉛(qian)蓄(xu)電(dian)池(chi)的(di)放(fang)電(dian)特(te)性(xing)曲(qu)線(xian)如(ru)圖(tu)5-11所(suo)示(shi)。在(zai)通(tong)信(xin)電(dian)源(yuan)係(ji)統(tong)中(zhong),閥(fa)控(kong)鉛(qian)蓄(xu)電(dian)池(chi)的(di)放(fang)電(dian)速(su)率(shuai)通(tong)常(chang)為(wei)0.02C10、0.1C110~0.2C10或(huo)0.3C10 ( C1o為(wei)蓄(xu)電(dian)池(chi)10小(xiao)時(shi)率(shuai)放(fang)電(dian)容(rong)量(liang))。閥(fa)控(kong)鉛(qian)蓄(xu)電(dian)池(chi)應(ying)用(yong)過(guo)程(cheng)中(zhong),應(ying)當(dang)盡(jin)可(ke)能(neng)避(bi)免(wen)放(fang)電(dian)速(su)率(shuai)過(guo)小(xiao)。
環(huan)境(jing)溫(wen)度(duo)對(dui)閥(fa)控(kong)鉛(qian)蓄(xu)電(dian)池(chi)放(fang)電(dian)特(te)性(xing)的(di)影(ying)響(xiang)很(hen)大(dai)。當(dang)采(cai)用(yong)0.1C10放(fang)電(dian)速(su)率(shuai)時(shi),在(zai)不(bu)同(tong)環(huan)境(jing)溫(wen)度(duo)下(xia)的(di)放(fang)電(dian)特(te)性(xing)曲(qu)線(xian)如(ru)圖(tu)5-12所(suo)示(shi)。從(zong)圖(tu)中(zhong)可(ke)以(yi)看(kan)出(chu),隨(sui)著(zhuo)環(huan)境(jing)溫(wen)度(duo)的(di)降(xiang)低(di),蓄(xu)電(dian)池(chi)能(neng)放(fang)出(chu)的(di)電(dian)量(liang)將(qiang)逐(zhu)步(bu)減(jian)小(xiao)。當(dang)環(huan)境(jing)溫(wen)度(duo)為(wei)-20°C ,電(dian)池(chi)仍(reng)可(ke)放(fang)出(chu)60%左(zuo)右(you)的(di)電(dian)量(liang)。應(ying)當(dang)說(shui)明(ming),當(dang)閥(fa)控(kong)鉛(qian)蓄(xu)電(dian)池(chi)充(chong)足(ju)電(dian)時(shi),電(dian)解(xie)液(ye)的(di)冰(bing)點(dian)為(wei)-70°C ,放(fang)完(wan)電(dian)時(shi),電(dian)解(xie)液(ye)的(di)冰(bing)點(dian)為(wei)-5°C。為(wei)了(liao)保(bao)化(hua)學(xue)反(fan)應(ying)充(chong)分(fen)進(jin)行(hang)。
( 2 )放(fang)電(dian)終(zhong)止(zhi)電(dian)壓(ya)的(di)設(she)定(ding)閥(fa)控(kong)鉛(qian)蓄(xu)電(dian)池(chi)組(zu)過(guo)放(fang)電(dian)後(hou)，各(ge)單(shan)體(ti)電(dian)池(chi)的(di)電(dian)壓(ya)和(hu)容(rong)量(liang)將(qiang)出(chu)現(xian)不(bu)平(ping)衡(heng),這(zhe)樣(yang),電(dian)池(chi)組(zu)中(zhong)將(qiang)出(chu)現(xian)落(la)後(hou)電(dian)池(chi)。通(tong)常(chang),過(guo)放(fang)電(dian)越(yue)嚴(yan)重(chong)，下(xia)次(ci)充(chong)電(dian)時(shi),落(la)後(hou)電(dian)池(chi)越(yue)不(bu)容(rong)易(yi)恢(hui)複(fu),這(zhe)樣(yang)將(qiang)嚴(yan)重(chong)影(ying)響(xiang)電(dian)池(chi)組(zu)的(di)壽(shou)命(ming)。為(wei)了(liao)避(bi)免(wen)過(guo)放(fang)電(dian),設(she)定(ding)電(dian)池(chi)的(di)放(fang)電(dian)終(zhong)止(zhi)電(dian)壓(ya)。從(zong)放(fang)電(dian)特(te)性(xing)曲(qu)線(xian)可(ke)以(yi)看(kan)出(chu),放(fang)電(dian)電(dian)流(liu)越(yue)大(dai),放(fang)電(dian)終(zhong)止(zhi)電(dian)壓(ya)越(yue)低(di)。采(cai)用(yong)不(bu)同(tong)放(fang)電(dian)速(su)率(shuai)時(shi),單(shan)體(ti)閥(fa)控(kong)鉛(qian)蓄(xu)電(dian)池(chi)放(fang)電(dian)終(zhong)止(zhi)電(dian)壓(ya)的(di)設(she)定(ding)如(ru)表(biao)5-3所(suo)示(shi)。
在(zai)通(tong)信(xin)電(dian)源(yuan)係(ji)統(tong)中(zhong), 開(kai)關(guan)整(zheng)流(liu)器(qi)通(tong)常(chang)將(qiang)閥(fa)控(kong)鉛(qian)蓄(xu)電(dian)池(chi)組(zu)的(di)放(fang)電(dian)終(zhong)止(zhi)電(dian)壓(ya)設(she)置(zhi)在(zai)43V ,單(shan)體(ti)電(dian)池(chi)的(di)終(zhong)止(zhi)電(dian)壓(ya)約(yao)為(wei)1.80V。采(cai)用(yong)0.05C1o~ 0.25C10速(su)率(shuai)放(fang)電(dian)時(shi),該(gai)終(zhong)止(zhi)電(dian)壓(ya)是(shi)合(ge)適(kuo)的(di)。但(dan)在(zai)部(bu)分(fen)通(tong)信(xin)電(dian)源(yuan)係(ji)統(tong)中(zhong),為(wei)了(liao)防(fang)止(zhi)市(shi)電(dian)較(jiao)長(zhang)時(shi)間(jian)中(zhong)斷(duan),蓄(xu)電(dian)池(chi)的(di)容(rong)量(liang)都(du)選(xuan)得(dei)偏(pian)大(dai)。這(zhe)樣(yang)市(shi)電(dian)中(zhong)斷(duan)時(shi),電(dian)池(chi)的(di)放(fang)電(dian)電(dian)流(liu)很(hen)小(xiao)。比(bi)如(ru)通(tong)信(xin)設(she)備(bei)實(shi)際(ji)所(suo)需(xu)電(dian)流(liu)隻(zhi)有(you)3A ,選(xuan)用(yong)的(di)蓄(xu)電(dian)池(chi)容(rong)量(liang)可(ke)達(da)300A.h。這(zhe)樣(yang),放(fang)電(dian)速(su)率(shuai)就(jiu)為(wei)0.01C10。 此(ci)時(shi),放(fang)電(dian)終(zhong)止(zhi)電(dian)壓(ya)應(ying)設(she)定(ding)為(wei)2.00V。因(yin)此(ci)，當(dang)終(zhong)止(zhi)電(dian)壓(ya)設(she)定(ding)為(wei)43V時(shi),閥(fa)控(kong)鉛(qian)蓄(xu)電(dian)池(chi)將(qiang)發(fa)生(sheng)嚴(yan)重(chong)過(guo)放(fang)電(dian)。
