-
摘 要 :真空(kong)(kong)(kong)斷(duan)路器(qi)(qi)與其他(ta)斷(duan)路器(qi)(qi)不(bu)同之(zhi)處在于滅(mie)火介質(zhi)的不(bu)一(yi)樣,真空(kong)(kong)(kong)斷(duan)路器(qi)(qi)不(bu)存在導電(dian)(dian)(dian)(dian)介質(zhi),使電(dian)(dian)(dian)(dian)弧(hu)快(kuai)速熄滅(mie),因此該斷(duan)路器(qi)(qi)的動靜觸頭之(zhi)間的間距很少。真空(kong)(kong)(kong)斷(duan)路器(qi)(qi)一(yi)般用(yong)于電(dian)(dian)(dian)(dian)壓等(deng)級相對(dui)較低的廠用(yong)電(dian)(dian)(dian)(dian)配置中(zhong)! 真空(kong)(kong)(kong)斷(duan)路器(qi)(qi)利用(yong)在高真空(kong)(kong)(kong)中(zhong)電(dian)(dian)(dian)(dian)流(liu)流(liu)過零(ling)點時,等(deng)離子體(ti)迅速擴散而熄滅(mie)電(dian)(dian)(dian)(dian)弧(hu),完成切斷(duan)電(dian)(dian)(dian)(dian)流(liu)的
2020-12-18 -
摘 要 :斷路器一般(ban)是(shi)由觸(chu)頭(tou)系統、操作(zuo)(zuo)機構、滅弧系統、外殼、脫(tuo)扣器等構成。 當發(fa)生短(duan)路時(shi),大電流(liu)產生的磁場(chang)克服(fu)反力彈簧,脫(tuo)扣器拉動操作(zuo)(zuo)機構動作(zuo)(zuo),開關瞬時(shi)跳(tiao)閘。當過載時(shi),電流(liu)變大,發(fa)熱量加劇,雙金(jin)屬片(pian)變形(xing)到(dao)一定的程度推動機機構動作(zuo)(zuo)。 斷路器的主(zhu)要作(zuo)(zuo)用是(shi)切斷和接通負荷電
2020-12-18 -
摘(zhai) 要 :處理(li)故障電(dian)(dian)容(rong)(rong)器(qi)(qi)應(ying)在斷開電(dian)(dian)容(rong)(rong)器(qi)(qi)的斷路器(qi)(qi),拉開斷路器(qi)(qi)兩則的隔離開關,并對電(dian)(dian)容(rong)(rong)器(qi)(qi)組經放(fang)(fang)電(dian)(dian)電(dian)(dian)阻(zu)放(fang)(fang)電(dian)(dian)后進(jin)行。電(dian)(dian)容(rong)(rong)器(qi)(qi)組經放(fang)(fang)電(dian)(dian)電(dian)(dian)阻(zu)(放(fang)(fang)電(dian)(dian)變(bian)壓器(qi)(qi)或放(fang)(fang)電(dian)(dian)電(dian)(dian)壓互感(gan)器(qi)(qi))放(fang)(fang)電(dian)(dian)以(yi)后,由于部分殘存電(dian)(dian)荷一時(shi)放(fang)(fang)不盡,仍應(ying)進(jin)行一次(ci)人工放(fang)(fang)電(dian)(dian)。放(fang)(fang)電(dian)(dian)時(shi)先將接地(di)線接地(di)端接好,再用(yong)接地(di)棒多(duo)次(ci)對電(dian)(dian)容(rong)(rong)器(qi)(qi)放(fang)(fang)電(dian)(dian),直至無放(fang)(fang)電(dian)(dian)火花及放(fang)(fang)
2020-12-18 -
摘 要 :世(shi)(shi)界上第一(yi)臺高(gao)壓真空(kong)接觸(chu)器(qi)是(shi)由英國GEC公(gong)司于1965年研制成功的,結構為(wei)(wei)前后布置(zhi)方(fang)式(shi),其額定(ding)電壓為(wei)(wei)6kV,額定(ding)電流為(wei)(wei)400A。20世(shi)(shi)紀90年代中期,德國西門子公(gong)司開發了(le)3TL8系(xi)列高(gao)壓真空(kong)接觸(chu)器(qi),結構為(wei)(wei)上下布置(zhi)方(fang)式(shi),額定(ding)電壓7.2kV,額定(ding)電流400A。ABB公(gong)司在20世(shi)(shi)紀90
2020-12-18 -
摘 要 :所謂的超程是(shi)(shi)真(zhen)空開關觸(chu)(chu)頭(tou)完全閉合后(hou),動(dong)或靜觸(chu)(chu)頭(tou)所能(neng)(neng)移(yi)動(dong)的距離。超程的作用主要有三(san)點,一(yi)是(shi)(shi)保證(zheng)觸(chu)(chu)頭(tou)在電(dian)磨損后(hou)仍能(neng)(neng)保持一(yi)定的接觸(chu)(chu)壓力(li);二是(shi)(shi)觸(chu)(chu)頭(tou)閉合時(shi)能(neng)(neng)利用觸(chu)(chu)頭(tou)彈簧力(li)緩沖,減(jian)小彈跳;三(san)是(shi)(shi),在觸(chu)(chu)頭(tou)分(fen)閘(zha)時(shi),使動(dong)觸(chu)(chu)頭(tou)獲得一(yi)定的初始的動(dong)能(neng)(neng),拉斷熔(rong)焊點,提高(gao)初始分(fen)閘(zha)速(su)度,減(jian)小燃弧時(shi)間,從而提高(gao)介
2020-12-18 -
摘 要 :太(tai)陽(yang)(yang)能具有可再(zai)生和環保等方面的(de)(de)特點,這種優勢讓包括中(zhong)國(guo)(guo)在內的(de)(de)許(xu)多國(guo)(guo)家將(jiang)太(tai)陽(yang)(yang)能作為(wei)重點發(fa)展的(de)(de)新(xin)能源產業(ye)。 中(zhong)國(guo)(guo)大(da)陸光伏產品(pin)主(zhu)要供應給歐美(mei)市場,國(guo)(guo)內市場份額很(hen)小。近(jin)年來(lai),由于歐美(mei)各國(guo)(guo)市場需(xu)求的(de)(de)增(zeng)大(da),我國(guo)(guo)光伏產業(ye)取得了快速的(de)(de)發(fa)展,最近(jin)5年的(de)(de)年均增(zeng)長速度達(da)到(dao)40%以上。在政策進一(yi)步加大(da)扶
2020-12-18 -
摘(zhai) 要 :(1)把握真空斷路器的基(ji)(ji)本結(jie)構,熟悉其技(ji)術性能(neng)指標(biao),合理選擇(ze)使用條件,密(mi)切與(yu)制(zhi)造的信息聯系(xi),準確地應用高壓(ya)(ya)真空斷路器先進(jin)技(ji)術功能(neng); (2)認真做好高壓(ya)(ya)真空斷路器機械參數調試工(gong)作(zuo),嚴格機械參數指標(biao)要求,才能(neng)保證其基(ji)(ji)本功能(neng); (3)規范備(bei)品備(bei)件治理和儲存,保證備(bei)
2020-12-18 -
摘 要 :1月6日,由國(guo)家(jia)質檢總局組織的國(guo)家(jia)重(zhong)大科學(xue)(xue)儀器設備開發專項寬(kuan)量(liang)(liang)限(xian)超(chao)高精(jing)密電流測(ce)量(liang)(liang)儀項目啟(qi)(qi)動會在中國(guo)計(ji)量(liang)(liang)科學(xue)(xue)研(yan)究院召開。這標(biao)志(zhi)著我國(guo)電流準確量(liang)(liang)值計(ji)量(liang)(liang)溯源體系研(yan)究正(zheng)式啟(qi)(qi)動。 電學(xue)(xue)計(ji)量(liang)(liang)是(shi)現代計(ji)量(liang)(liang)科學(xue)(xue)中應用(yong)最為廣泛(fan)的計(ji)量(liang)(liang),而(er)電流測(ce)量(liang)(liang)是(shi)電學(xue)(xue)計(ji)量(liang)(liang)的核(he)心和基礎。國(guo)內外測(ce)量(liang)(liang)電流的普遍方法
2020-12-18 -
摘 要 :一 照明(ming)配(pei)電(dian)(dian)箱用(yong)途 照明(ming)配(pei)電(dian)(dian)箱的作(zuo)用(yong)是(shi)配(pei)電(dian)(dian)控制將電(dian)(dian)能(neng)分配(pei)到(dao)各個負荷部位,及(ji)在電(dian)(dian)路短路、過載和(he)漏電(dian)(dian)時進(jin)行斷電(dian)(dian)保護。作(zuo)為配(pei)電(dian)(dian)系統的終端電(dian)(dian)器設備。被廣(guang)泛的用(yong)于樓宇、廣(guang)場、車站及(ji)工礦企(qi)業(ye)。 二 箱體(ti)結構(gou) 設備的柜(ju)架可采(cai)用(yong)焊接或由螺釘組裝連接而(er)成。柜(ju)架和(he)外殼應有足夠機械強度(du)和(he)剛度(du)
2020-12-18 -
摘 要 :我們在設(she)計(ji)(ji)防(fang)塵防(fang)水(shui)配(pei)(pei)電(dian)箱的(de)時(shi)候(hou)防(fang)護(hu)等級(ji)越(yue)高(gao)(gao),防(fang)水(shui)配(pei)(pei)電(dian)箱的(de)性能要求(qiu)就越(yue)高(gao)(gao),有的(de)時(shi)候(hou)我們為了(le)突出防(fang)護(hu)效(xiao)果(guo)還特別(bie)設(she)計(ji)(ji)一些防(fang)雨帽,這(zhe)(zhe)樣(yang)能夠更加有效(xiao)的(de)防(fang)止水(shui)或者是灰塵的(de)滲入,很容易將箱蓋(gai)與箱體分離(li)開,這(zhe)(zhe)樣(yang)用戶(hu)也可以方便的(de)進行(xing)加工和印(yin)刷作業。 尺寸的(de)選(xuan)擇是我們選(xuan)擇防(fang)水(shui)配(pei)(pei)電(dian)
2020-12-18