外文资料PowerSystemProtectionsIntroductionThesteady-,aneffective,,ifduetoanyreason,sayafault,thereisanabnormality,itisnecessarythatthereshouldbeadevicewhichsensestheseabnormalconditionsandifso,ponentwheresuchanabnormalityhastakenplaceisremoved,,work,,,whichsensesthefault,,,,thereusedtobeelectromechanicalrelayofinductiondisk-,verysoonthediskwasreplacedbyinvertedcup,,whichisstillinuse,possessesseveralimporta
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