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電壓互感器（Potential transformer 簡(jiǎn)稱(chēng)PT，Voltage transformer也簡(jiǎn)稱(chēng)VT）和變壓器類(lèi)似，是用來(lái)變換線(xiàn)路上的電壓的儀器。但是變壓器變換電壓的目的是為了輸送電能，因此容量很大，一般都是以千伏安或兆伏安為計算單位；而電壓互感器變換電壓的目的，主要是用來(lái)給測量?jì)x表和繼電保護裝置供電，用來(lái)測量線(xiàn)路的電壓、功率和電能，或者用來(lái)在線(xiàn)路發(fā)生故障時(shí)保護線(xiàn)路中的貴重設備、電機和變壓器，因此電壓互感器的容量很小，一般都只有幾伏安、幾十伏安，最大也不超過(guò)一千伏安。詞條介紹了其基本結構、工作原理、主要類(lèi)型、接線(xiàn)方式、注意事項、異常與處理、以及鐵磁諧振等。

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電壓互感器（Potential transformer 簡(jiǎn)稱(chēng)PT，Voltage transformer也簡(jiǎn)稱(chēng)VT）和變壓器類(lèi)似，是用來(lái)變換線(xiàn)路上的電壓的儀器。但是變壓器變換電壓的目的是為了輸送電能，因此容量很大，一般都是以千伏安或兆伏安為計算單位；而電壓互感器變換電壓的目的，主要是用來(lái)給測量?jì)x表和繼電保護裝置供電，用來(lái)測量線(xiàn)路的電壓、功率和電能，或者用來(lái)在線(xiàn)路發(fā)生故障時(shí)保護線(xiàn)路中的貴重設備、電機和變壓器，因此電壓互感器的容量很小，一般都只有幾伏安、幾十伏安，最大也不超過(guò)一千伏安。詞條介紹了其基本結構、工作原理、主要類(lèi)型、接線(xiàn)方式、注意事項、異常與處理、以及鐵磁諧振等。

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