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    直流屏的蓄電池運行問題,如何改善蓄電池運行壽命
    時間:2021-06-03 09:10:40 點擊次數(shù):4819

    變電站直流屏蓄電池存在的問題

    變電站的蓄電池運用壽數(shù)均在3年以內(nèi),遠遠達不到廠家規(guī)劃的年限。

    導致蓄電池壽數(shù)縮短的原因分析

    1廠家建議及使用習慣

    由于是免維護蓄電池,且直流屏為自動操控充電形式,工作比較可靠,按廠家建議,每年只進行一次活化。由于前兩年工作情況杰出,隨即認可了對蓄電池的這種處理形式。由于電池潛在的問題,前兩年在工作中并未顯露出來,多年工作后,電池容量大幅度下降。

    2直流屏工作情況的不同,電池老化的程度也不同

    35kV變電站,處在結(jié)尾,工作方法單一,操作機遇極少,電池的放電量很低,幾乎得不到活化,容量下降很快;110kV蒙陰變電站是樞紐變電站,工作方法多變,操作頻繁,電池經(jīng)常放電,且放電量很大,活化頻率較高,容量易保持在較高水平。

    3對蓄電池功能缺少了解,日常工作維護處理不當

    按照直流屏反事端方法要求,浮充電工作的蓄電池組,除制造廠有特殊規(guī)則外,應選用恒壓方法進行浮充電。浮充電時,應嚴格操控單體電池的浮充電壓上、下限,避免蓄電池因充電電壓過高或過低而損壞,即避免長期過充電或欠充電。以現(xiàn)在遍及運用的閥控式密封鉛酸蓄電池為例,實踐證明,實踐的浮充電壓與規(guī)則的浮充電壓相差5%時,其運用壽數(shù)將縮短一半。蓄電池浮充電壓一般按U(25)=E+0.1設(shè)定(E為單體電池額外電壓),出產(chǎn)廠家有說明的,應按照說明要求進行設(shè)定。均充限流電流可按I=(0.1~0.125)C10(C10為蓄電池10小時率放電電流)進行設(shè)定,最大充電電流不能超越1.5C10。而在日常維護中往往忽略這個細節(jié),不能根據(jù)不同型號、廠家的蓄電池對充電參數(shù)的具體要求不同區(qū)別對待,而是選用一致的均、浮充電參數(shù),乃至隨意設(shè)置充電參數(shù),畢竟導致了對蓄電池功能的損壞。

    其他,還要避免過放電。過放電電壓的設(shè)定:2V電池為例,閥控密封鉛酸蓄電池放電時限為10 h,放電電壓為1.8~1.9 V

    4直流屏系統(tǒng)參數(shù)的改動,使蓄電池的充放電頻率和深度下降,加快了電池老化,進而大幅度下降容量變電站原有的系統(tǒng),斷路器的操作安排均為電磁型,合閘電流大,且指示燈為大電流的燈泡,使蓄電池的放電電流增大,均充電次數(shù)多,可使電池經(jīng)常得到活化,電池的容量始終保持在一個較高水平。跟著斷路器的操作安排逐步替換為彈簧儲能型,合閘電流很小,且指示燈也替換為小電流的節(jié)能型燈泡,使蓄電池的放電電流減小,幾乎沒有均充機遇,只工作在浮充情況,電池的活化頻率極低,電池的極板活性物質(zhì)逐步固化,使電池的容量逐步下降,直至下降到規(guī)范值以下。

    5其他要素影響

    直流屏蓄電池設(shè)備不規(guī)范,存儲運送中對蓄電池的損壞及蓄電池的作業(yè)環(huán)境溫度、通風情況等不符合要求也會對蓄電池的功能及壽數(shù)構(gòu)成晦氣影響。無人值守條件下監(jiān)測系統(tǒng)不完善,也是構(gòu)成縮短運用年限的一個重要原因。

    這兒重點分析環(huán)境溫度的影響。閥控密封鉛酸蓄電池由于結(jié)構(gòu)原因(極板緊密設(shè)備、貧液規(guī)劃、徹底密封)散熱晦氣,其充電電壓與溫度關(guān)系密切。具體說,閥控密封鉛酸蓄電池的充電電壓具有負溫度系數(shù):-3 mV/℃。即溫度每升高1℃,單個蓄電池充電電壓將下降3 mV。不然,易構(gòu)成熱失控(熱失控:充電時,蓄電池內(nèi)部氣體復合自身就是放熱反應,使蓄電池內(nèi)部溫度升高,如浮充電電壓不變,充電電流將增大,析氣量增大,促進溫度升得更高,而由于結(jié)構(gòu)原因不易散熱,將構(gòu)成熱失控。其他溫度過高,將導致極板活性物質(zhì)脫落,極板變

    形和腐蝕,而使電池壽數(shù)變短。所以,必定要根據(jù)環(huán)境溫度的改動,對浮充電壓進行補償,還應有防高溫方法)

    6.改進直流屏系統(tǒng)蓄電池壽數(shù)的方法

    針對以上分析及現(xiàn)場查詢計算發(fā)現(xiàn),從用戶角度來說,構(gòu)成蓄電池運用壽數(shù)縮短的主要原因還有以下幾點,針對這些要素,可采用相應的方法。

    活化深度、周期固定。針對這一問題,可人為的縮短活化周期,例如由每年一次改為每季度、每月一次;改動活化深度,例如每月進行一次小容量放電(放電深度的30%),每季度進行一次中等容量放電(放電深度的50%),每年進行一次大容量放電(放電深度的 100%,放電深度要嚴格掌握,避免將蓄電池放垮)

    根據(jù)直流屏系統(tǒng)的工作情況不同。可進行相關(guān)維護處理制度的完善,加大對電網(wǎng)變電站蓄電池的監(jiān)測力度,增加巡視次數(shù)。

    直流屏蓄電池的日常維護:

    測量和記錄蓄電池室內(nèi)環(huán)境溫度;

    查看蓄電池的清潔度、端子的危害痕跡,外殼及殼蓋的損壞或過熱痕跡;

    查看殼蓋、極柱、安全閥周圍是否有滲液和酸霧分出;

    蓄電池外殼和極柱的溫度;

    蓄電池組的浮充電壓、浮充電流;

    每半年檢測單體蓄電池的端電壓和內(nèi)阻,若內(nèi)阻大于80 mQ,應及時活化或替換;每年以實踐負荷做一次核對性放電(春秋時節(jié)比較合適);防高溫、防過充電、過入電、及時充電(蓄電池放電后,趕快充電)

    無人值守監(jiān)測手段落后。可設(shè)備先進的蓄電池在線監(jiān)測系統(tǒng),實時監(jiān)測其工作情況,并經(jīng)過遠動傳輸至監(jiān)控中心。

    直流屏蓄電池工作環(huán)境不符合要求。可在主控室設(shè)備進行操控的調(diào)溫、通風設(shè)備。按照反事故方案要求,浮充電工作的蓄電池組,應嚴格操控地點蓄電池室環(huán)境溫度,不能長期超越30℃,避免因環(huán)境溫度過高使蓄電池容量嚴峻下降,工作壽數(shù)縮短。直流屏的蓄電池設(shè)備工藝不規(guī)范。針對各種外部要素影響應采用的相應方法。實踐上蓄電池的工作質(zhì)量是由產(chǎn)品質(zhì)量、設(shè)備質(zhì)量和工作維護質(zhì)量共同決議的。產(chǎn)品質(zhì)量屬于廠家要素,而經(jīng)過完善蓄電池的設(shè)備工藝進步其工作質(zhì)量,是用戶有必要做到也是徹底可以做到的。蓄電池設(shè)備前有必要徹底查看蓄電池的外殼。仔細查看有無決裂處。蓄電池應盡可能設(shè)備在清潔、陰涼、通風、干燥的當?shù)兀苊怅柟庵鄙洹P铍姵刂g間隔一般大于50 mm,以便散熱杰出。設(shè)備前應驗證蓄電池出產(chǎn)與設(shè)備運用之間的時刻間隔。逐一檢測蓄電池的開路電壓。一般要在3個月以內(nèi)投入運用。不然,應先均衡充電。

    直流屏系統(tǒng)肯定阻止選用新、老組合方法的蓄電池組。不同容量的蓄電池肯定不可在同一組中串聯(lián)運用。設(shè)備前,需要用銅絲刷清刷端柱連接面,以下降觸摸電阻。新設(shè)備的蓄電池組,應進行核對性放電實驗。導致蓄電池運用壽數(shù)縮短的要素還有廠家要素等。但就用戶角度講,經(jīng)過施行必定的維護方法,可以有用的進步變電站蓄電池的工作功率,然后延長其運用周期,減少供電企業(yè)在這方面的出資,確保了直流屏系統(tǒng)乃至整個電網(wǎng)的安全、穩(wěn)定運行。

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