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變壓器的絕緣等級，并不是絕緣強度的概念，而是允許的溫升的標準，即絕緣等級是指其所用絕緣材料的耐熱等級，分A、E、B、F、H級。絕緣的溫度等級分為A級 E級B級 F級H級。各絕緣等級具體允許溫升標準如下：最高允許溫度（℃）105 120 130 155 180  上海英施丹-變壓器
繞組溫升(sheng)限值（K）60 75 80 100 125性能參考溫度(du)（℃）80 95 100 120 145變(bian)(bian)壓(ya)(ya)器(qi)(qi)(qi)的(de)容量等級：30、50、63、80、100、125、160、200、250、315、400、500、630、800、1000、1250、1600、2000、2500、3150、4000、5000、6300、8000、10000、12500、16000、20000、25000、31500、40000、50000、63000、90000、120000、150000、180000、260000、360000、400000 kVA。通常，容量為(wei)630KVA及(ji)以下的(de)變(bian)(bian)壓(ya)(ya)器(qi)(qi)(qi)統稱(cheng)為(wei)小(xiao)型變(bian)(bian)壓(ya)(ya)器(qi)(qi)(qi)；800~6300KVA的(de)變(bian)(bian)壓(ya)(ya)器(qi)(qi)(qi)稱(cheng)為(wei)中(zhong)型變(bian)(bian)壓(ya)(ya)器(qi)(qi)(qi)；8000~63000KVA的(de)變(bian)(bian)壓(ya)(ya)器(qi)(qi)(qi)稱(cheng)為(wei)大型變(bian)(bian)壓(ya)(ya)器(qi)(qi)(qi)；90000KVA以上的(de)變(bian)(bian)壓(ya)(ya)器(qi)(qi)(qi)稱(cheng)為(wei)特大型變(bian)(bian)壓(ya)(ya)器(qi)(qi)(qi)。

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干式變壓器微機保護裝置是用于測量、控制、保護、通訊一體化的一種經濟型保護；針對配網終端高壓配電室量身定做，以三段式無方向電流保護為核心，配備電網參數的監視及采集功能，可省掉傳統的電流表、電壓表、功率表、頻率表、電度表等，并可通過通訊口將測量數據及保護信息遠傳上位機，方便實現配網自動化；裝置根據配網供電的特性在裝置內集成了備用電源自投功能，可靈活實現進線備投及母分備投功能。高郵
干式變(bian)壓器微(wei)機保(bao)(bao)(bao)護裝(zhuang)置(zhi)[4]采(cai)用了國際先進的DSP和表面貼裝(zhuang)技術(shu)及靈活(huo)的現場總線(xian)（CAN）技術(shu)，滿足(zu)變(bian)電(dian)(dian)站不(bu)同電(dian)(dian)壓等級的要(yao)求，實現了變(bian)電(dian)(dian)站的協調(diao)化(hua)、數字式及智能(neng)化(hua)。此(ci)系列產品(pin)(pin)可(ke)(ke)完成(cheng)變(bian)電(dian)(dian)站的保(bao)(bao)(bao)護、測量、控(kong)制、調(diao)節、信號、故(gu)障錄波(bo)、電(dian)(dian)度采(cai)集(ji)、小電(dian)(dian)流接地選線(xian)、低周(zhou)減載等功能(neng)，使產品(pin)(pin)的技術(shu)要(yao)求、功能(neng)、內(nei)部接線(xian)更加規范化(hua)。產品(pin)(pin)采(cai)用分(fen)布式保(bao)(bao)(bao)護測控(kong)裝(zhuang)置(zhi)，可(ke)(ke)集(ji)中組(zu)屏(ping)或分(fen)散(san)安(an)裝(zhuang)，也可(ke)(ke)根據用戶需要(yao)任意改變(bian)配置(zhi)，以滿足(zu)不(bu)同方(fang)案要(yao)求。

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電(dian)(dian)(dian)(dian)(dian)(dian)子變(bian)壓(ya)器(qi)除了體(ti)積較小外(wai)，在電(dian)(dian)(dian)(dian)(dian)(dian)力(li)(li)變(bian)壓(ya)器(qi)與(yu)電(dian)(dian)(dian)(dian)(dian)(dian)子變(bian)壓(ya)器(qi)二者之(zhi)(zhi)(zhi)間(jian)，并沒有明確(que)的(de)(de)(de)(de)分界線。一(yi)(yi)般(ban)提供(gong)(gong)(gong)(gong)50Hz電(dian)(dian)(dian)(dian)(dian)(dian)力(li)(li)網絡之(zhi)(zhi)(zhi)電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)均非常龐大(da)，它可能(neng)是涵蓋有半(ban)個(ge)洲地區那般(ban)大(da)的(de)(de)(de)(de)容量。電(dian)(dian)(dian)(dian)(dian)(dian)子裝(zhuang)置的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)力(li)(li)限制，通常受限于整(zheng)流(liu)(liu)、放大(da)，與(yu)系統(tong)其它組件的(de)(de)(de)(de)能(neng)力(li)(li)，其中有些部(bu)分屬(shu)放大(da)電(dian)(dian)(dian)(dian)(dian)(dian)力(li)(li)者，但如與(yu)電(dian)(dian)(dian)(dian)(dian)(dian)力(li)(li)系統(tong)發電(dian)(dian)(dian)(dian)(dian)(dian)能(neng)力(li)(li)相比較，它仍然歸屬(shu)于小電(dian)(dian)(dian)(dian)(dian)(dian)力(li)(li)之(zhi)(zhi)(zhi)范圍。各(ge)(ge)種電(dian)(dian)(dian)(dian)(dian)(dian)子裝(zhuang)備常用(yong)到變(bian)壓(ya)器(qi)，理由(you)是：提供(gong)(gong)(gong)(gong)各(ge)(ge)種電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)階(jie)層(ceng)確(que)保系統(tong)正常操(cao)作(zuo)；提供(gong)(gong)(gong)(gong)系統(tong)中以不同電(dian)(dian)(dian)(dian)(dian)(dian)位(wei)操(cao)作(zuo)部(bu)分得以電(dian)(dian)(dian)(dian)(dian)(dian)氣隔離(li)；對交流(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)提供(gong)(gong)(gong)(gong)高阻(zu)(zu)抗，但對直(zhi)流(liu)(liu)則提供(gong)(gong)(gong)(gong)低的(de)(de)(de)(de)阻(zu)(zu)抗；在不同的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)位(wei)下(xia)，維持或修(xiu)飾波形與(yu)頻率響應。「阻(zu)(zu)抗」其中之(zhi)(zhi)(zhi)一(yi)(yi)項重要概(gai)念，亦即(ji)電(dian)(dian)(dian)(dian)(dian)(dian)子學(xue)特性之(zhi)(zhi)(zhi)一(yi)(yi)，其乃預設(she)(she)(she)一(yi)(yi)種設(she)(she)(she)備，即(ji)當(dang)電(dian)(dian)(dian)(dian)(dian)(dian)路組件阻(zu)(zu)抗系從一(yi)(yi)階(jie)層(ceng)改變(bian)到另外(wai)的(de)(de)(de)(de)一(yi)(yi)個(ge)階(jie)層(ceng)時(shi)，其間(jian)即(ji)使用(yong)到一(yi)(yi)種設(she)(she)(she)備-變(bian)壓(ya)器(qi)。

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