描述
在電壓互感器二次回路中,除接有繼電保護(hù)裝置的電壓線圈外,在表計(jì)回路中還接有測(cè)量表計(jì)的電壓線圈。為了防止二次主回路和測(cè)量表計(jì)的電壓回路短路,在電壓互感器的二次主回路和測(cè)量表計(jì)回路中,需加裝熔斷器。其容量選擇如下:
(1)電壓互感器的二次主回路中熔斷器的額定電流應(yīng)為最大負(fù)荷電流的1.5倍。雙母線情況下,應(yīng)考慮一組母線運(yùn)行時(shí),所有電壓回路負(fù)荷全部切換至一組電壓互感器上。一般。隋況下,總?cè)蹟嗥靼?~5A選擇,表計(jì)回路按1~2A選擇。
(2)應(yīng)考慮裝設(shè)在二次主回路的熔斷器與表計(jì)回路的熔斷器在動(dòng)作時(shí)間和靈敏度上相配合,即表計(jì)回路熔斷器的動(dòng)作時(shí)間應(yīng)小于繼電保護(hù)裝置的動(dòng)作時(shí)間,這樣二次表計(jì)回路短路時(shí),不至于引起繼電保護(hù)誤動(dòng)作。若熔斷器的動(dòng)作時(shí)間不能滿足速動(dòng)要求,特別是熔斷器經(jīng)過渡電阻短路時(shí),熔斷器的動(dòng)作時(shí)間很長(zhǎng),則應(yīng)選用低壓斷路器。一般認(rèn)為,110kV系統(tǒng)裝有阻抗保護(hù)(距離保護(hù))時(shí),應(yīng)在110kV電壓互感器二次側(cè)加裝快速自動(dòng)低壓斷路器。
(3)110kV以上電壓等級(jí)的電壓互感器一次側(cè)不裝設(shè)熔斷器;35kV戶外電壓互感器一次側(cè)裝設(shè)帶限流電阻的角形熔斷器,其限流電阻的數(shù)值約為396Ω。35、10kV戶內(nèi)電壓互感器一次側(cè)均裝設(shè)充填石英砂的瓷管熔斷器。以上熔斷器的額定電流均為0.5A,熔斷電流為0.6~1.8A。
歐美品牌停產(chǎn)的,常用的“PLC”備品備件
我司產(chǎn)品應(yīng)用于以下領(lǐng)域:
1,《發(fā)電廠DCS監(jiān)控系統(tǒng)》
2,《智能平鋼化爐系統(tǒng)制造》
3,《PLC可編程輸送控制系統(tǒng)》
4,《DCS集散控制系統(tǒng)》
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5,《智能型消防供水控制系統(tǒng)》
6,《化工廠藥液恒流量計(jì)算機(jī)控制系統(tǒng)》
7,《電氣控制系統(tǒng)》造紙,印染生產(chǎn)線,變電站綜合自動(dòng)化控制系列
本特利,英維思,伍德沃德,??怂共_、西屋、瑞恩、施耐德莫迪康、ABB、AB、西門子、摩托羅拉、GE發(fā)那科、安川、博世力士樂,ACSO,力士樂等各大品牌的DCS系統(tǒng)配件,機(jī)器人系統(tǒng)配件,大型伺服系統(tǒng)備件。
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