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干式電流互感器

電壓互感器斷線故障處理原則

發布日期:2022-04-18 點擊率:109

    電壓互感器一旦斷線,會發出預告音響和光字牌,低壓繼電器動作,頻率監視燈熄滅,儀表指示不正常。此時首先應檢查電壓互感器的熔斷器熔體是否熔斷。如果發現高壓或低壓熔體熔斷,應將有關保護(如低壓閉鎖、方向閉鎖、距離保護、復合電壓閉鎖等)解除,按以下原則進行處理:

    1)若高壓熔體熔斷,應仔細查明原因,并排除故障。只有確認無問題,才可進行更換。

    2)若低壓側熔體熔斷,應立即更換,并保證熔體容量與原來的相同,不得增大。

    3)排除故障,更換熔體和恢復正常情況后,將停用的保護裝置投入運行。

    4)若更換熔體后,仍發出斷線信號,則應拉開刀閘,并在采取安全措施后進行檢查。檢查時查看回路接頭有無松動、斷開現象,切換回路有無接觸不良、短路等故障。

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