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方向是從T2流向Tl。從圖中可以看到，觸發(fā)電流越大，轉(zhuǎn)折電壓就越低，這種情形和普通可控硅的觸發(fā)導(dǎo)通規(guī)律是一致的，當(dāng)加到主電極上的電壓使Tl對(duì)T2的極性為正時(shí)，叫做反向電壓，并用符號(hào)U12表示。當(dāng)這個(gè)電壓達(dá)到轉(zhuǎn)折電壓值時(shí)，圖3（b)右邊的可控硅便觸發(fā)導(dǎo)通，這時(shí)的電流為I12，其方向是從T1到T2。這時(shí)雙向可控硅的特性曲線(xiàn)，如圖4中第三象限所示。四種觸發(fā)由于在雙向可控硅的主電極上，無(wú)論加以正向電壓或是反向電壓，也不管觸發(fā)是正向還是反向，它都能被觸發(fā)導(dǎo)通，因此它有以下四種觸發(fā)：(1)當(dāng)主電極T2對(duì)Tl所加的電壓為正向電壓，控制極G對(duì)電極Tl所加的也是正向觸發(fā)（圖5a）。雙向可控硅觸發(fā)導(dǎo)通后?？招木€(xiàn)圈往往由漆包線(xiàn)均勻繞制在環(huán)形骨架上制成，骨架采用塑料、陶瓷等非鐵磁材料，其相對(duì)磁導(dǎo)率與空氣的相對(duì)磁導(dǎo)率相同，這是空心線(xiàn)圈有別于帶鐵心的電流互感器的一個(gè)顯著特征。（3）鐵心線(xiàn)圈式低功率電流互感器（LPCT）。它是電磁式電流互感器的一種發(fā)展。其按照高阻抗電阻設(shè)計(jì)，在非常高的一次電流下，飽和特性，擴(kuò)大了測(cè)量范圍，了功率消耗，可以無(wú)飽和的高準(zhǔn)確度測(cè)量高達(dá)短路電流的過(guò)電流、全偏移短路電流，測(cè)量和保護(hù)可共用一個(gè)鐵心線(xiàn)圈式低功率電流互感器，其輸出為電壓。兩者的使用發(fā)展方向由于電磁式電流互感器存在的易飽和、非線(xiàn)性及頻帶窄等問(wèn)題，電子式電流互感器逐漸興起。電子式電流互感器一般具有抗磁飽和、低功耗、寬頻帶等優(yōu)點(diǎn)。

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