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山東聊城變壓器有限公司在確認了SGB11干式變壓器鐵(tie)芯確實存在(zai)多點(dian)接地故(gu)(gu)障(zhang)，則應(ying)對SGB11干(gan)(gan)式(shi)(shi)變(bian)(bian)(bian)壓(ya)器的(de)運行(xing)狀(zhuang)況進行(xing)分析，判斷鐵(tie)芯多點(dian)接地故(gu)(gu)障(zhang)的(de)類型，以(yi)便于(yu)確認(ren)應(ying)急措施(shi)及處(chu)理方案。干(gan)(gan)式(shi)(shi)SGB11干(gan)(gan)式(shi)(shi)變(bian)(bian)(bian)壓(ya)器:依(yi)靠(kao)空氣對流(liu)進行(xing)冷卻，一般(ban)用(yong)于(yu)局部照明、電(dian)子線路。機(ji)械(xie)設備等SGB11干(gan)(gan)式(shi)(shi)變(bian)(bian)(bian)壓(ya)器，在(zai)電(dian)力系統中(zhong)(zhong)，一般(ban)汽(qi)機(ji)SGB11干(gan)(gan)式(shi)(shi)變(bian)(bian)(bian)壓(ya)器、鍋爐SGB11干(gan)(gan)式(shi)(shi)變(bian)(bian)(bian)壓(ya)器、除灰SGB11干(gan)(gan)式(shi)(shi)變(bian)(bian)(bian)壓(ya)器、除塵SGB11干(gan)(gan)式(shi)(shi)變(bian)(bian)(bian)壓(ya)器、脫硫SGB11干(gan)(gan)式(shi)(shi)變(bian)(bian)(bian)壓(ya)器等都(dou)是干(gan)(gan)式(shi)(shi)SGB11干(gan)(gan)式(shi)(shi)變(bian)(bian)(bian)壓(ya)器，變(bian)(bian)(bian)比(bi)為6000V/400V和10KV/400V，用(yong)于(yu)帶額定電(dian)壓(ya)380V的(de)負載。簡(jian)單的(de)說(shuo)干(gan)(gan)式(shi)(shi)SGB11干(gan)(gan)式(shi)(shi)變(bian)(bian)(bian)壓(ya)器就是指鐵(tie)芯和繞組不浸漬在(zai)絕緣油中(zhong)(zhong)的(de)SGB11干(gan)(gan)式(shi)(shi)變(bian)(bian)(bian)壓(ya)器。
首先應查詢SGB11干式(shi)變(bian)壓(ya)器(qi)(qi)投運(yun)的時間(jian)、負荷情(qing)(qing)況、有(you)(you)無(wu)突發故(gu)障(zhang)或沖擊(ji)等(deng)，其次(ci)是SGB11干式(shi)變(bian)壓(ya)器(qi)(qi)歷(li)史運(yun)行情(qing)(qing)況，安裝(zhuang)試(shi)驗記錄(lu)等(deng)，綜(zong)合(he)以上因素再結(jie)合(he)色(se)譜(pu)分(fen)析、電氣試(shi)驗數據進(jin)行判斷，確認鐵(tie)芯接(jie)地(di)故(gu)障(zhang)的類(lei)型。如SGB11干式(shi)變(bian)壓(ya)器(qi)(qi)鐵(tie)芯電阻突然降低，色(se)譜(pu)分(fen)析數據無(wu)異常(chang)，而SGB11干式(shi)變(bian)壓(ya)器(qi)(qi)長時間(jian)沒有(you)(you)運(yun)行，則可能是由于(yu)油泥沉淀導致鐵(tie)芯多點(dian)接(jie)地(di)，屬(shu)于(yu)不穩定接(jie)地(di)故(gu)障(zhang)，對應采(cai)取措施(shi)消(xiao)除(chu)即可。
非(fei)晶(jing)態(tai)導(dao)磁材料(liao)具有磁導(dao)率高、電(dian)阻率大和鐵(tie)損小等(deng)優點，采(cai)用非(fei)晶(jing)態(tai)合金(jin)作為鐵(tie)芯(xin)材料(liao)的(de)配電(dian)SGB11干式(shi)(shi)變壓器。其空載損耗可比同容(rong)(rong)量(liang)的(de)硅鋼鐵(tie)芯(xin)SGB11干式(shi)(shi)變壓器降低 60％～80％，目前非(fei)晶(jing)態(tai)SGB11干式(shi)(shi)變壓器容(rong)(rong)量(liang)1600kVA以下主要作為配電(dian)SGB11干式(shi)(shi)變壓器，用于工礦企業(ye)、農(nong)村(cun)電(dian)網、配電(dian)系(xi)統，但由于受制(zhi)造工藝的(de)限制(zhi)，非(fei)晶(jing)態(tai)SGB11干式(shi)(shi)變壓器產品目前的(de)容(rong)(rong)量(liang)還較小，不能作為電(dian)力SGB11干式(shi)(shi)變壓器使用在輸變電(dian)系(xi)統。
根(gen)據試驗(yan)電(dian)(dian)(dian)壓(ya)的(de)要(yao)求，應(ying)適當選擇(ze)放電(dian)(dian)(dian)量小的(de)支撐(cheng)SGB11干式(shi)變壓(ya)器的(de)容(rong)(rong)(rong)量和電(dian)(dian)(dian)壓(ya)等(deng)級(ji)，并進行必(bi)要(yao)的(de)電(dian)(dian)(dian)容(rong)(rong)(rong)補償。電(dian)(dian)(dian)容(rong)(rong)(rong)補償的(de)原(yuan)則(ze)是根(gen)據勵(li)磁電(dian)(dian)(dian)流值(zhi)來(lai)確(que)定的(de)。對一(yi)臺15000kVA/220kVSGB11干式(shi)變壓(ya)器實測(ce)時，若需(xu)施加150kV試驗(yan)電(dian)(dian)(dian)壓(ya)(相對地(di)有效值(zhi))，則(ze)可選擇(ze)支撐(cheng)SGB11干式(shi)變壓(ya)器參(can)數為100kVA/50kV，此(ci)時補償電(dian)(dian)(dian)容(rong)(rong)(rong)約為0.04μF.
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在(zai)確認(ren)了SGB11干式(shi)變(bian)壓器鐵芯(xin)多(duo)點(dian)接地(di)故障(zhang)的(de)類(lei)型后，應(ying)根據現場情(qing)況及故障(zhang)類(lei)型采(cai)取應(ying)急措(cuo)施，從而排(pai)除不穩定(ding)接地(di)或限制故障(zhang)的(de)發展。
對(dui)于(yu)不(bu)穩定接(jie)(jie)地故(gu)障，在設備停運的情(qing)況(kuang)下(xia)，可(ke)采用電(dian)(dian)容放(fang)(fang)電(dian)(dian)沖擊(ji)法(fa)排除故(gu)障，方法(fa)如下(xia)：如圖(tu)一，將(jiang)K接(jie)(jie)于(yu)鐵(tie)(tie)芯(xin)(xin)正常接(jie)(jie)地點（SGB11干式變壓(ya)器(qi)鐵(tie)(tie)芯(xin)(xin)接(jie)(jie)地引出線斷開），利用兆歐(ou)表對(dui)電(dian)(dian)容進行充(chong)電(dian)(dian)約(yue)60S后(hou)，將(jiang)刀閘開關K倒向放(fang)(fang)電(dian)(dian)回路(lu)，電(dian)(dian)容對(dui)鐵(tie)(tie)芯(xin)(xin)接(jie)(jie)地故(gu)障點放(fang)(fang)電(dian)(dian)，然后(hou)測試鐵(tie)(tie)芯(xin)(xin)絕緣電(dian)(dian)阻(zu)(zu)，如電(dian)(dian)阻(zu)(zu)值恢復正常則故(gu)障排除，否(fou)則重復充(chong)放(fang)(fang)電(dian)(dian)過程幾(ji)次即可(ke)排除故(gu)障。由于(yu)SGB11干式變壓(ya)器(qi)鐵(tie)(tie)芯(xin)(xin)底(di)部絕緣墊塊較薄，采取的沖擊(ji)電(dian)(dian)流不(bu)宜過大(da)，避免發生擊(ji)穿(chuan)。
HWBR繞(rao)組(zu)變(bian)(bian)形測(ce)試儀(yi)用(yong)于測(ce)試6KV及(ji)(ji)以上電(dian)壓等(deng)級電(dian)力(li)SGB11干(gan)(gan)式(shi)(shi)變(bian)(bian)壓器及(ji)(ji)其(qi)它特(te)殊用(yong)途的(de)SGB11干(gan)(gan)式(shi)(shi)變(bian)(bian)壓器，電(dian)力(li)SGB11干(gan)(gan)式(shi)(shi)變(bian)(bian)壓器在運行或(huo)者(zhe)運輸過程中不可(ke)(ke)避免地要遭受各(ge)種故障短路(lu)電(dian)流的(de)沖(chong)擊(ji)或(huo)者(zhe)物理(li)撞擊(ji)，在短路(lu)電(dian)流產生(sheng)的(de)強大電(dian)動力(li)作用(yong)下(xia)，SGB11干(gan)(gan)式(shi)(shi)變(bian)(bian)壓器繞(rao)組(zu)可(ke)(ke)能失去穩定性，導致局部扭曲、鼓(gu)包或(huo)移位等(deng)永久變(bian)(bian)形現(xian)象，這(zhe)樣將(jiang)嚴重影響(xiang)(xiang)SGB11干(gan)(gan)式(shi)(shi)變(bian)(bian)壓器的(de)安全運行。按國家電(dian)力(li)行業(ye)標準DL/T911－2004采用(yong)頻(pin)(pin)(pin)率響(xiang)(xiang)應(ying)(ying)分析(xi)法測(ce)量SGB11干(gan)(gan)式(shi)(shi)變(bian)(bian)壓器的(de)繞(rao)組(zu)變(bian)(bian)形，是(shi)通過檢(jian)測(ce)SGB11干(gan)(gan)式(shi)(shi)變(bian)(bian)壓器各(ge)個繞(rao)組(zu)的(de)幅頻(pin)(pin)(pin)響(xiang)(xiang)應(ying)(ying)特(te)性，并對(dui)檢(jian)測(ce)結果進(jin)行縱向或(huo)橫向比較，根據幅頻(pin)(pin)(pin)響(xiang)(xiang)應(ying)(ying)特(te)性的(de)變(bian)(bian)化程度，判(pan)斷SGB11干(gan)(gan)式(shi)(shi)變(bian)(bian)壓器可(ke)(ke)能發(fa)生(sheng)的(de)繞(rao)組(zu)變(bian)(bian)形。 |
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