To　avoid　the　re-close　for　permanent　fault　of　EHV　transmission　line　with　shunt　reactor　and　neutral　reactor,　the　grounding　switch　S　between　neutral　reactor　and　ground　should　be　closed　before　single-phase　re-close,　as　the　voltage　of　broken　line　can　be　used　to　determine　the　fault　type　and　insulation　level.　The　percentage　of　neutral　reactor　windings　shorted　directly　or　by　damping　resistor　is　set　for　the　control　of　the　vibrating　voltage　of　broken　line　to　avoid　over-voltage.　Simulations　with　ATP-EMTP　show　that,　for　non-permanent　fault,　if　the　closing　time　deference　between　the　Ss　at　two　sides　is　less　than　30　ms　or　the　closing　time　of　the　later　S　is　near　the　lowest　point　of　vibrating　voltage　magnitude,　the　vibrating　voltage　of　broken　line　can　reach　the　rated　level　and　the　re-close　succeeds;　if　the　voltage　of　broken　line　keeps　low,　it　is　a　permanent　fault.　This　project　is　supported　by　the　Natural　Science　Foundation　of　Fujian　Province　(2008J0011).