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電壓互感器是發(fā)電廠(chǎng)、變電所等輸電和供電系統不可缺少的一種電器。精密電壓互感器是電測試驗室中用來(lái)擴大量限，測量電壓、功率和電能的一種儀器。電壓互感器和變壓器很相像，都是用來(lái)變換線(xiàn)路上的電壓。

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電壓互感器

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電壓互感器是發(fā)電廠(chǎng)、變電所等輸電和供電系統不可缺少的一種電器。精密電壓互感器是電測試驗室中用來(lái)擴大量限，測量電壓、功率和電能的一種儀器。電壓互感器和變壓器很相像，都是用來(lái)變換線(xiàn)路上的電壓。

線(xiàn)路上為什么需要變換電壓呢？這是因為根據發(fā)電、輸電和用電的不同情況，線(xiàn)路上的電壓大小不一，而且相差懸殊，有的是低壓220V和380V，有的是高壓幾萬(wàn)伏甚至幾十萬(wàn)伏。要直接測量這些低壓和高壓電壓，就需要根據線(xiàn)路電壓的大小，制作相應的低壓和高壓的電壓表和其他儀表和繼電器。這樣不僅會(huì )給儀表制作帶來(lái)很大困難，而且更主要的是，要直接制作高壓儀表，直接在高壓線(xiàn)路上測量電壓，那是不可能的，而且也是絕對不允許的。

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