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關于變電站直流屏技術的分析研究

2019/6/10 14:30:31??????點擊:
直流(liu)(liu)(liu)屏是(shi)變電(dian)(dian)站(zhan)正常運行的(de)重要組成,其能夠持續向變電(dian)(dian)站(zhan)輸送穩定的(de)直流(liu)(liu)(liu)電(dian)(dian)源(yuan)(yuan),滿足了電(dian)(dian)力設備操作運行的(de)用(yong)電(dian)(dian)需求。從實際運用(yong)情況(kuang)來說,變電(dian)(dian)站(zhan)蓄電(dian)(dian)池直流(liu)(liu)(liu)屏在使用(yong)壽命及(ji)電(dian)(dian)能供應方面的(de)性(xing)能難以達到標準要求,制約了直流(liu)(liu)(liu)電(dian)(dian)源(yuan)(yuan)操作系統性(xing)能的(de)發揮。研究(jiu)發現采(cai)用(yong)超級電(dian)(dian)容(rong)直流(liu)(liu)(liu)屏可有(you)效解決直流(liu)(liu)(liu)電(dian)(dian)源(yuan)(yuan)供應難題,經過改(gai)進后的(de)超級電(dian)(dian)容(rong)直流(liu)(liu)(liu)屏在性(xing)能、壽命、穩定等(deng)方面都有(you)了很大的(de)改(gai)善,其與蓄電(dian)(dian)池直流(liu)(liu)(liu)屏相比(bi)存在明顯的(de)優勢(shi)。
直流電(dian)(dian)(dian)源(yuan)操(cao)作(zuo)(zuo)系統(tong)(tong)簡稱“直流屏”,在(zai)變電(dian)(dian)(dian)站中(zhong)向各種(zhong)電(dian)(dian)(dian)力(li)設(she)備提供穩定(ding)的(de)直流電(dian)(dian)(dian)源(yuan),也是現代(dai)變電(dian)(dian)(dian)站核心的(de)電(dian)(dian)(dian)力(li)操(cao)作(zuo)(zuo)電(dian)(dian)(dian)源(yuan)。直流屏技(ji)術不(bu)僅保護了電(dian)(dian)(dian)力(li)系統(tong)(tong)的(de)正常運行(xing),對(dui)于(yu)其他元(yuan)件(jian)(jian)的(de)穩定(ding)操(cao)控也起到很(hen)好的(de)保護作(zuo)(zuo)用。對(dui)變電(dian)(dian)(dian)站直流屏存在(zai)的(de)問題進行(xing)深入分析,可(ke)(ke)以(yi)保證持續性的(de)直流電(dian)(dian)(dian)源(yuan)供應,為電(dian)(dian)(dian)力(li)設(she)備及相關模塊的(de)正常操(cao)控創造有(you)利(li)的(de)條件(jian)(jian)。電(dian)(dian)(dian)力(li)行(xing)業積極引入直流屏技(ji)術可(ke)(ke)加快變電(dian)(dian)(dian)站的(de)自動化(hua)、智能(neng)化(hua)發展,提高變電(dian)(dian)(dian)站設(she)備運行(xing)的(de)整(zheng)體效率。
一、當前變電站直流屏存在的(de)問題
國內變(bian)電(dian)(dian)站(zhan)(zhan)采用的(de)直(zhi)(zhi)(zhi)(zhi)流(liu)(liu)屏(ping)(ping)由充電(dian)(dian)柜、充電(dian)(dian)模(mo)(mo)塊(kuai)、監控模(mo)(mo)塊(kuai)、電(dian)(dian)池(chi)組(zu)、降壓硅(gui)鏈等結構組(zu)成,每一個模(mo)(mo)塊(kuai)都對直(zhi)(zhi)(zhi)(zhi)流(liu)(liu)電(dian)(dian)源供應(ying)(ying)發揮(hui)重要(yao)(yao)的(de)作用。從行業發展趨勢分析直(zhi)(zhi)(zhi)(zhi)流(liu)(liu)屏(ping)(ping),其屬于數字化調(diao)控模(mo)(mo)式下運行的(de)直(zhi)(zhi)(zhi)(zhi)流(liu)(liu)系統,對變(bian)電(dian)(dian)站(zhan)(zhan)直(zhi)(zhi)(zhi)(zhi)流(liu)(liu)電(dian)(dian)源供應(ying)(ying)具(ju)有調(diao)控、保護、管理(li)、監測等多方面作用。目前,變(bian)電(dian)(dian)站(zhan)(zhan)采用直(zhi)(zhi)(zhi)(zhi)流(liu)(liu)屏(ping)(ping)技術(shu)(shu)具(ju)備(bei)了遠程監測、調(diao)控等高級功(gong)能,方便(bian)了值班(ban)人員對電(dian)(dian)力系統運行的(de)調(diao)控。但(dan)直(zhi)(zhi)(zhi)(zhi)流(liu)(liu)屏(ping)(ping)存在(zai)的(de)一些問(wen)題也(ye)應(ying)(ying)該引起技術(shu)(shu)人員的(de)關注,鎘鎳(nie)蓄電(dian)(dian)池(chi)、密封鉛酸蓄電(dian)(dian)池(chi)是常用的(de)直(zhi)(zhi)(zhi)(zhi)流(liu)(liu)屏(ping)(ping),其主要(yao)(yao)問(wen)題如下:
(一)鎘鎳蓄電池(chi)直流屏(ping)
1.性能問題(ti)。變電(dian)(dian)(dian)(dian)(dian)站通過直流(liu)母線輸出電(dian)(dian)(dian)(dian)(dian)能需要使(shi)用大批(pi)蓄(xu)電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)模(mo)塊(kuai)(kuai),以此來(lai)維持(chi)正常的(de)直流(liu)電(dian)(dian)(dian)(dian)(dian)源操控。如:一(yi)般情況(kuang)下,大型變電(dian)(dian)(dian)(dian)(dian)站直流(liu)母線輸出220V,需使(shi)用200只(zhi)左右(you)的(de)蓄(xu)電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)組合(he)(he)模(mo)塊(kuai)(kuai)。但鎘鎳(nie)(nie)蓄(xu)電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)在生(sheng)產處理期間,廠家無法保(bao)證每只(zhi)蓄(xu)電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)的(de)充電(dian)(dian)(dian)(dian)(dian)、放(fang)電(dian)(dian)(dian)(dian)(dian)性能完全一(yi)致(zhi),200只(zhi)蓄(xu)電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)組合(he)(he)起來(lai)會產生(sheng)明顯的(de)特(te)性差異。鎘鎳(nie)(nie)蓄(xu)電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)直流(liu)屏(ping)在供(gong)應直流(liu)電(dian)(dian)(dian)(dian)(dian)源后(hou)所連(lian)接的(de)充電(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)源一(yi)致(zhi),并(bing)且負荷放(fang)電(dian)(dian)(dian)(dian)(dian)的(de)對象相(xiang)同。這種特(te)點(dian)導致(zhi)局(ju)部鎘鎳(nie)(nie)蓄(xu)電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)的(de)性能減弱,降低了(le)整個蓄(xu)電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)組合(he)(he)模(mo)塊(kuai)(kuai)的(de)功能。
2.壽命(ming)問題。由于(yu)(yu)鎘(ge)鎳(nie)蓄(xu)電池組合(he)材料的(de)(de)(de)(de)(de)缺陷,直流(liu)(liu)屏運行時本(ben)(ben)質(zhi)上處于(yu)(yu)“浮(fu)充(chong)(chong)狀態”,此時鎘(ge)鎳(nie)蓄(xu)電池直流(liu)(liu)屏的(de)(de)(de)(de)(de)使(shi)用壽命(ming)取決于(yu)(yu)充(chong)(chong)電機。按照行業標準里的(de)(de)(de)(de)(de)規(gui)定,廠家對鎘(ge)鎳(nie)蓄(xu)電池的(de)(de)(de)(de)(de)保證命(ming)在10年以上,而具(ju)體使(shi)用的(de)(de)(de)(de)(de)記錄情況僅有5年左右的(de)(de)(de)(de)(de)時間(jian)。蓄(xu)電池直流(liu)(liu)屏壽命(ming)縮短的(de)(de)(de)(de)(de)原(yuan)(yuan)因是由94于(yu)(yu)俯沖電流(liu)(liu)超標會造成電解液中的(de)(de)(de)(de)(de)水電解成氫、氧,這是造成蓄(xu)電池炸的(de)(de)(de)(de)(de)根本(ben)(ben)原(yuan)(yuan)因,若采用鎘(ge)鎳(nie)蓄(xu)電池直流(liu)(liu)屏時未(wei)做特殊(shu)處理(li),則很容易引起意外事故。因此,直流(liu)(liu)屏的(de)(de)(de)(de)(de)使(shi)用壽命(ming)長短會受(shou)到(dao)其他(ta)方面因素的(de)(de)(de)(de)(de)限制。
3.氧(yang)(yang)(yang)化(hua)(hua)(hua)問題。變電(dian)(dian)廠(chang)鎘鎳蓄(xu)電(dian)(dian)池直流屏使(shi)用期間也會(hui)(hui)出現氧(yang)(yang)(yang)化(hua)(hua)(hua)還原反(fan)應,使(shi)鎘鎳材料發(fa)生(sheng)化(hua)(hua)(hua)學(xue)反(fan)應生(sheng)成氧(yang)(yang)(yang)化(hua)(hua)(hua)鎘,造成極板的(de)有效面積(ji)不斷減小。為了避免氧(yang)(yang)(yang)化(hua)(hua)(hua)還原反(fan)應的(de)發(fa)生(sheng),變電(dian)(dian)站工作人(ren)員會(hui)(hui)定(ding)期對(dui)蓄(xu)電(dian)(dian)池進行“活化(hua)(hua)(hua)試(shi)驗”分析。在活化(hua)(hua)(hua)試(shi)驗里需對(dui)蓄(xu)電(dian)(dian)池進行充放電(dian)(dian)處理,這(zhe)一階段的(de)操(cao)作會(hui)(hui)發(fa)生(sheng)極性反(fan)轉(zhuan)而導(dao)致蓄(xu)電(dian)(dian)池報廢。另外,氧(yang)(yang)(yang)化(hua)(hua)(hua)還原反(fan)應在破壞鎘鎳直流屏性能的(de)同(tong)時,對(dui)變電(dian)(dian)站的(de)穩定(ding)運行也會(hui)(hui)埋下(xia)安全隱患(huan),如:若把蓄(xu)電(dian)(dian)池完全安裝于柜內,很容易引起燒毀、爆炸等安全事故。
(二)密(mi)封鉛酸(suan)蓄電池直流屏
在(zai)(zai)科學技術的(de)(de)推動下,國(guo)內(nei)變電(dian)站(zhan)直(zhi)流(liu)(liu)屏技術不(bu)斷發展,許多(duo)新的(de)(de)蓄電(dian)池(chi)產品(pin)也(ye)在(zai)(zai)變電(dian)站(zhan)中得(de)到了(le)普(pu)遍運用(yong)(yong)。基(ji)于(yu)鎘鎳(nie)(nie)蓄電(dian)池(chi)直(zhi)流(liu)(liu)屏存在(zai)(zai)的(de)(de)不(bu)足,企業開始采用(yong)(yong)密(mi)封(feng)鉛酸蓄電(dian)池(chi),簡稱“閥控(kong)蓄電(dian)池(chi)”。這種產品(pin)在(zai)(zai)質量、性(xing)能、價格、維護等(deng)(deng)方(fang)(fang)面均優于(yu)鎘鎳(nie)(nie)蓄電(dian)池(chi)。如:閥控(kong)蓄電(dian)池(chi)無(wu)需進行過多(duo)的(de)(de)維護或加水處理,為變電(dian)站(zhan)操作人(ren)(ren)員提供了(le)很大的(de)(de)方(fang)(fang)便。但該直(zhi)流(liu)(liu)屏處于(yu)“全密(mi)封(feng)”狀(zhuang)態也(ye)引(yin)起(qi)了(le)諸多(duo)問題,尤其是在(zai)(zai)電(dian)池(chi)觀測、檢(jian)查等(deng)(deng)操作時(shi),維護人(ren)(ren)員難(nan)以(yi)及時(shi)更新裝(zhuang)置。另外(wai),由于(yu)國(guo)內(nei)閥控(kong)蓄電(dian)池(chi)技術相(xiang)對落(luo)后,產品(pin)運用(yong)(yong)于(yu)變電(dian)站(zhan)時(shi)壽命無(wu)保障,并且對于(yu)閥控(kong)蓄電(dian)池(chi)直(zhi)流(liu)(liu)屏的(de)(de)運行條件十分嚴格,給變電(dian)站(zhan)的(de)(de)正常生產造成了(le)很大的(de)(de)困難(nan)。
二(er)、影響閾控蓄電池壽命(ming)的(de)因素(su)
使用壽(shou)命(ming)是制約閥控蓄電池推(tui)廣(guang)的重要因
素,各大、中、小型變電站采用(yong)這(zhe)種電源裝(zhuang)置均(jun)會考(kao)慮使(shi)用(yong)壽(shou)命的年限,以控制(zhi)變電站的運(yun)行成本(ben)。經試驗(yan)數(shu)據分析,對閥(fa)控蓄電池使(shi)用(yong)壽(shou)命造成影響的因素集中在溫度因素、放電因素、失水因素、腐蝕因素,等等。
(一)溫度因素
盡管閥(fa)控蓄電(dian)(dian)(dian)池(chi)(chi)運(yun)用于(yu)變(bian)電(dian)(dian)(dian)站(zhan)還存在明顯的不足,但與鎘(ge)鎳蓄電(dian)(dian)(dian)池(chi)(chi)相比已經有了很大的改進,對變(bian)電(dian)(dian)(dian)站(zhan)直(zhi)流電(dian)(dian)(dian)源操(cao)作系(xi)統的運(yun)行(xing)(xing)創造了更好的條件(jian)。閥(fa)控蓄電(dian)(dian)(dian)池(chi)(chi)壽(shou)命(ming)對溫度十(shi)分敏感,生產廠家(jia)要(yao)求(qiu)電(dian)(dian)(dian)池(chi)(chi)運(yun)行(xing)(xing)環境溫為15℃~25℃,當環境溫度超過(guo)25℃后,每升高10℃電(dian)(dian)(dian)池(chi)(chi)壽(shou)命(ming)就要(yao)縮短一(yi)半。
(二)放(fang)電因素
蓄(xu)電(dian)(dian)(dian)池(chi)(chi)(chi)被(bei)過度放電(dian)(dian)(dian)是影響蓄(xu)電(dian)(dian)(dian)池(chi)(chi)(chi)使用壽命(ming)的(de)另一重要因(yin)素。當(dang)蓄(xu)電(dian)(dian)(dian)池(chi)(chi)(chi)被(bei)過度放電(dian)(dian)(dian)到輸出電(dian)(dian)(dian)壓為零時,會導致電(dian)(dian)(dian)池(chi)(chi)(chi)內部(bu)有(you)大量(liang)的(de)硫酸(suan)鉛被(bei)吸(xi)付(fu)到電(dian)(dian)(dian)池(chi)(chi)(chi)的(de)陰極表(biao)面,形成(cheng)電(dian)(dian)(dian)池(chi)(chi)(chi)陰極的(de)硫酸(suan)鹽(yan)化。在陰極板上形成(cheng)的(de)硫酸(suan)鹽(yan)越多,電(dian)(dian)(dian)池(chi)(chi)(chi)的(de)內阻越大,閥控蓄(xu)電(dian)(dian)(dian)池(chi)(chi)(chi)的(de)使用壽命(ming)會大大減(jian)短。
(三)腐蝕因素
板柵(zha)腐蝕(shi)是影響蓄電池使用壽(shou)命(ming)的重要(yao)原因。在開路狀態下(xia),鉛合金與活性(xing)二氧化鉛直接接觸,而(er)且共(gong)同(tong)浸在硫酸溶液中。在過充電狀態下(xia),正極由于(yu)析(xi)氧反(fan)應,水被(bei)消(xiao)耗,H增(zeng)加,從而(er)導致正極附(fu)近酸度增(zeng)高。電池的柵(zha)板就會變(bian)薄,容量降低,會縮(suo)短(duan)使用壽(shou)命(ming)。
(四(si))浮充因素(su)
變電(dian)站(zhan)使(shi)(shi)用(yong)的(de)蓄(xu)(xu)電(dian)池大(da)多數都處于長(chang)期的(de)浮充(chong)電(dian)狀態下(xia),這(zhe)樣(yang)會造成(cheng)蓄(xu)(xu)電(dian)池的(de)陽極極板鈍化,使(shi)(shi)蓄(xu)(xu)電(dian)池內阻急劇增大(da),使(shi)(shi)蓄(xu)(xu)電(dian)池的(de)實(shi)際容量(liang)(Ah)遠遠低于其(qi)標準容量(liang),從而導(dao)致(zhi)蓄(xu)(xu)電(dian)池所能(neng)提供(gong)的(de)實(shi)際后備供(gong)電(dian)時(shi)間大(da)大(da)縮短,減(jian)少其(qi)使(shi)(shi)用(yong)壽命。
(五(wu))失水因素
蓄(xu)(xu)電池(chi)(chi)失(shi)水(shui)也是(shi)影響其使(shi)(shi)用壽(shou)命的(de)因素之一,蓄(xu)(xu)電池(chi)(chi)失(shi)水(shui)會導(dao)致(zhi)電解液(ye)比重(zhong)增加,電池(chi)(chi)柵板的(de)腐蝕,使(shi)(shi)蓄(xu)(xu)電池(chi)(chi)的(de)活性物質減(jian)(jian)少,從而使(shi)(shi)蓄(xu)(xu)電池(chi)(chi)的(de)容量(liang)(liang)降低(di)而導(dao)致(zhi)其使(shi)(shi)用壽(shou)命減(jian)(jian)少。當失(shi)水(shui)5.5%時,容量(liang)(liang)降到75%;失(shi)水(shui)達到25%時,容量(liang)(liang)基本(ben)消(xiao)失(shi)。
三、超級電容(rong)用于直(zhi)流屏(ping)的有關試驗
為(wei)了(le)(le)證明超級電(dian)容用(yong)于變(bian)電(dian)站直流(liu)屏中的(de)(de)優點,列舉了(le)(le)幾個常見的(de)(de)試(shi)驗案例,根據試(shi)驗結果(guo)分析超級電(dian)容直流(liu)屏技術的(de)(de)綜(zong)合性能(neng)特點。
(一)用超級電容對斷(duan)路器合閘的試(shi)驗
超級(ji)電(dian)(dian)(dian)(dian)(dian)容(rong)(rong)標稱容(rong)(rong)量0.82F,耐壓280V,用(yong)超級(ji)電(dian)(dian)(dian)(dian)(dian)容(rong)(rong)對(dui)斷路器合(he)(he)閘(zha)(zha)的試驗。試驗方法:斷開615柜合(he)(he)閘(zha)(zha)電(dian)(dian)(dian)(dian)(dian)源;將(jiang)已充電(dian)(dian)(dian)(dian)(dian)的超級(ji)電(dian)(dian)(dian)(dian)(dian)容(rong)(rong)兩出線端(duan)并(bing)接在合(he)(he)閘(zha)(zha)接觸器觸頭上(shang);模(mo)擬正常方式合(he)(he)閘(zha)(zha),按下(xia)合(he)(he)閘(zha)(zha)接鈕(niu),記錄合(he)(he)閘(zha)(zha)次(ci)數(shu)和(he)電(dian)(dian)(dian)(dian)(dian)容(rong)(rong)端(duan)電(dian)(dian)(dian)(dian)(dian)壓。共合(he)(he)閘(zha)(zha)15次(ci),每次(ci)都合(he)(he)閘(zha)(zha)成功。結果:電(dian)(dian)(dian)(dian)(dian)容(rong)(rong)充電(dian)(dian)(dian)(dian)(dian)至10%額定電(dian)(dian)(dian)(dian)(dian)壓95時,可對(dui)CD-Ⅱ型電(dian)(dian)(dian)(dian)(dian)磁機(ji)構可靠合(he)(he)閘(zha)(zha)大于8次(ci),每次(ci)合(he)(he)閘(zha)(zha)使電(dian)(dian)(dian)(dian)(dian)容(rong)(rong)端(duan)電(dian)(dian)(dian)(dian)(dian)壓下(xia)降5V。
(二)超級(ji)電容充電時間測試
超級電(dian)(dian)(dian)容的初(chu)充電(dian)(dian)(dian),如(ru)不加(jia)限流電(dian)(dian)(dian)阻,相當于發生短路(lu)。生產廠家推薦使用1000W碘鎢燈作限流電(dian)(dian)(dian)阻,其(qi)冷態電(dian)(dian)(dian)阻較熱態電(dian)(dian)(dian)阻小(xiao)近10倍(bei),符合(he)電(dian)(dian)(dian)容電(dian)(dian)(dian)壓上升后宜減(jian)小(xiao)限流電(dian)(dian)(dian)阻的要求。以下試驗數據均(jun)是串入(ru)1000W碘鎢燈實(shi)測的數據。結果:不同的充電(dian)(dian)(dian)電(dian)(dian)(dian)源對充電(dian)(dian)(dian)速度有影響,但不管什么(me)電(dian)(dian)(dian)源電(dian)(dian)(dian)容由零(ling)伏充至額(e)定電(dian)(dian)(dian)壓時僅需(xu)3分鐘。以后,長期浮充電(dian)(dian)(dian)流在0~10mA變化。
(三)超(chao)級電容自放電測試
將超(chao)級電(dian)容充至242V后(hou),與負載完全脫離,隔日同一時(shi)(shi)間(jian)測量(liang)電(dian)容端電(dian)壓。結(jie)果:端電(dian)壓下(xia)(xia)降速度與是否(fou)經過浮充有關(guan),未經浮充開(kai)始幾個小時(shi)(shi)達2~3V/h,即每小時(shi)(shi)下(xia)(xia)降2~3V,經過浮充半小時(shi)(shi)以后(hou),自(zi)放(fang)電(dian)速度明顯變緩,可能是電(dian)容內部電(dian)荷來不及分布均勻有關(guan)。在正常(chang)運用時(shi)(shi),超(chao)級電(dian)容處在長期浮充狀態(tai),完全斷開(kai)負載后(hou)可維持有效電(dian)壓達3天(72小時(shi)(shi))。
四、超級電(dian)容(rong)直流(liu)屏(ping)與蓄電(dian)池直流(liu)屏(ping)的性能對比
根據超級電(dian)容(rong)運(yun)用于直(zhi)流屏(ping)的(de)(de)試驗(yan)結(jie)果分析,其不僅擺脫了(le)(le)傳統(tong)蓄(xu)電(dian)池(chi)直(zhi)流屏(ping)存(cun)在的(de)(de)不足,也顯著提(ti)升了(le)(le)變電(dian)站電(dian)力系統(tong)運(yun)行(xing)的(de)(de)效率,為(wei)操作人員的(de)(de)系統(tong)控制與(yu)改造(zao)提(ti)供了(le)(le)足夠的(de)(de)直(zhi)流電(dian)源。為(wei)了(le)(le)驗(yan)證超級電(dian)容(rong)直(zhi)流屏(ping)的(de)(de)諸多優(you)勢,本文以使用性能為(wei)重點,從故障(zhang)、壽命、維護等方面,對超級電(dian)容(rong)直(zhi)流屏(ping)與(yu)蓄(xu)電(dian)池(chi)直(zhi)流屏(ping)進(jin)行(xing)綜合對比(bi)。
(一)故障方面對比
變電(dian)(dian)站(zhan)不(bu)管采用(yong)哪一類蓄(xu)電(dian)(dian)池,其(qi)在(zai)使(shi)用(yong)時都需要配(pei)備相應(ying)的(de)(de)放(fang)(fang)電(dian)(dian)裝(zhuang)置,這是(shi)保證蓄(xu)電(dian)(dian)池持(chi)續供應(ying)直(zhi)流(liu)(liu)電(dian)(dian)源的(de)(de)重要條件(jian)。參(can)照試驗結果(guo)判斷,傳統(tong)蓄(xu)電(dian)(dian)池直(zhi)流(liu)(liu)屏(ping)采用(yong)的(de)(de)放(fang)(fang)電(dian)(dian)裝(zhuang)置的(de)(de)故障(zhang)發(fa)生率明(ming)顯高(gao)于(yu)超級(ji)電(dian)(dian)容直(zhi)流(liu)(liu)屏(ping),不(bu)利于(yu)變電(dian)(dian)站(zhan)日常(chang)操作的(de)(de)穩(wen)定(ding)運行。而超級(ji)電(dian)(dian)容放(fang)(fang)電(dian)(dian)裝(zhuang)置在(zai)結構方面更(geng)為簡(jian)化,對其(qi)進行改造或放(fang)(fang)電(dian)(dian)更(geng)加(jia)便捷。
(二)壽命方面對比
當蓄電(dian)(dian)池使用(yong)結束后需要(yao)進行充(chong)電(dian)(dian)才能正常使用(yong),長(chang)期充(chong)電(dian)(dian)會(hui)導致蓄電(dian)(dian)池的(de)使用(yong)壽命(ming)(ming)減短(duan),一(yi)般要(yao)短(duan)于(yu)標準使用(yong)壽命(ming)(ming)的(de)5~10年時(shi)間,限(xian)制了蓄電(dian)(dian)池直流(liu)屏作(zuo)用(yong)的(de)穩定發揮。而超級電(dian)(dian)容(rong)直流(liu)屏的(de)使用(yong)壽命(ming)(ming)更(geng)長(chang),這是由(you)于(yu)其不存在(zai)過(guo)充(chong)電(dian)(dian)、過(guo)放電(dian)(dian)問(wen)題,在(zai)生產期間限(xian)定最高充(chong)電(dian)(dian)電(dian)(dian)壓即可滿(man)足維護(hu)需要(yao),有(you)效避免(mian)了超級電(dian)(dian)容(rong)使用(yong)壽命(ming)(ming)減短(duan)。
(三)維護方面(mian)對(dui)比
從直(zhi)(zhi)流屏(ping)維(wei)護(hu)(hu)角(jiao)度(du)來看,變電(dian)(dian)站的(de)日常(chang)(chang)維(wei)護(hu)(hu)工作量較大,不(bu)僅要定(ding)期(qi)對蓄(xu)(xu)電(dian)(dian)池進行檢測(ce)、更新(xin),還要對電(dian)(dian)池內部的(de)線路(lu)連接(jie)綜合監測(ce),給工作人員造成(cheng)了很大的(de)難度(du)。但超級電(dian)(dian)容直(zhi)(zhi)流屏(ping)用于變電(dian)(dian)站無需過多的(de)維(wei)護(hu)(hu),在安裝(zhuang)初(chu)期(qi)對直(zhi)(zhi)流屏(ping)裝(zhuang)置(zhi)全面(mian)檢測(ce)達標后即可(ke)長期(qi)使用。從性(xing)能(neng)恢(hui)(hui)復(fu)來說,蓄(xu)(xu)電(dian)(dian)池放電(dian)(dian)后要經(jing)過幾(ji)個(ge)小時的(de)恢(hui)(hui)復(fu)才能(neng)正常(chang)(chang)供(gong)(gong)電(dian)(dian),超級電(dian)(dian)容僅需3~5分(fen)鐘即可(ke)復(fu)原電(dian)(dian)能(neng)。保持了變電(dian)(dian)站的(de)正常(chang)(chang)供(gong)(gong)電(dian)(dian)。
五(wu)、結論(lun)
直(zhi)(zhi)流(liu)電(dian)源操作(zuo)系統是變(bian)(bian)(bian)電(dian)站正常運行的(de)(de)(de)基(ji)本(ben)保證,其(qi)能夠(gou)及時(shi)將(jiang)電(dian)流(liu)輸送到各個電(dian)力設(she)備中供應使用。伴(ban)隨著社會(hui)現代化(hua)發(fa)展(zhan)步伐的(de)(de)(de)加快,我(wo)國變(bian)(bian)(bian)電(dian)站建(jian)設(she)面(mian)(mian)臨(lin)著新的(de)(de)(de)改革優化(hua),各種蓄電(dian)池直(zhi)(zhi)流(liu)屏(ping)逐漸(jian)被(bei)其(qi)他形式(shi)的(de)(de)(de)裝(zhuang)置所取(qu)代,這(zhe)對于變(bian)(bian)(bian)電(dian)站未來的(de)(de)(de)革新發(fa)展(zhan)大有幫助。超(chao)級電(dian)容(rong)直(zhi)(zhi)流(liu)屏(ping)是變(bian)(bian)(bian)電(dian)站直(zhi)(zhi)流(liu)屏(ping)的(de)(de)(de)先(xian)進技術,其(qi)在性能、維護、壽命、故障等(deng)方面(mian)(mian)都(dou)明顯優越于傳(chuan)統的(de)(de)(de)蓄電(dian)池直(zhi)(zhi)流(liu)屏(ping),在電(dian)力行業中應得到全(quan)面(mian)(mian)推廣使用。
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