原(yuan)(yuan)有(you)消(xiao)(xiao)弧(hu)線(xian)(xian)圈容(rong)量不足，接地時(shi)選線(xian)(xian)裝置準確(que)(que)率低僅為60%左右，導(dao)致相關的(de)配網(wang)自動化系統在接地故(gu)(gu)障(zhang)時(shi)無法發揮效用。本次技改通(tong)過將原(yuan)(yuan)有(you)消(xiao)(xiao)弧(hu)線(xian)(xian)圈更換為消(xiao)(xiao)弧(hu)線(xian)(xian)圈并聯小(xiao)電(dian)阻接地成套裝置，接地持(chi)續時(shi)間長于10s的(de)故(gu)(gu)障(zhang)通(tong)過將小(xiao)電(dian)阻正(zheng)確(que)(que)投入，確(que)(que)保零序保護正(zheng)確(que)(que)動作，準確(que)(que)切除故(gu)(gu)障(zhang)線(xian)(xian)路，使(shi)得(de)系統快速恢復正(zheng)常。