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      1. 高壓互感器分類

        2014/1/10 9:08:14      點擊:
         高壓互感器 ——按原理分為電磁感應式和電容分壓式兩類。
        按用途,電壓互感器又分為測量用和保護用兩類。
        電磁感應式電壓互感器。工作原理與變壓器相同;窘Y構也是鐵芯和原、副繞組。特點是容量很小且比較恒定,正常運行時接近于空載狀態(tài)。電壓互感器本身阻抗很小,一旦副邊發(fā)生短路,電流將急劇增加而燒毀線圈。為此,電壓互感器原邊接有熔斷器,副邊接地,以免原、副邊絕緣損壞時,副邊出現(xiàn)對地高電位而造成事故。電磁感應式電壓互感器的等值電路與變壓器的等值電路相同。
        電容分壓式電壓互感器。在電容分壓器的基礎上制成。電容式電壓互感器多與電力系統(tǒng)載波通信的耦合電容器合用,以簡化系統(tǒng),降低造價。此時,它還需滿足通信運行上的要求。電壓互感器按結構分類,有充油式、干式以及三芯五柱式和單相式,還有全絕緣式和半絕緣式。
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