In　order　to　investigate　the　characteristics　of　overvoltage　on　typical　grounding　faults　and　check　the　reasonability　of　current　arrester　arrangement　±1　100　kV　HVDC　converter　station,　the　grounding　faults　occurred　in　both　converter　stations　were　analyzed　based　on　Zhundong-Wannan　HVDC　transmission　project　using　PSCAD.　Overvoltage　caused　by　following　situations　were　taken　into　calculation　under　bipolar　full　voltage,　mono-polar　metallic　return,　and　mono-polar　ground　return　styles　(grounding　fault　at　top　of　converter,　grounding　fault　transformer　winding　at　valve　side,　and　grounding　fault　at　DC　bus　and　DC　line).　Moreover,the　characteristics　of　overvoltage　waveform　were　analyzed　and　the　maximum　voltage　and　absorbed　energy　of　corresponding　arresters　are　provided.　The　calculation　results　indicate　that　the　energy　caused　by　faults　at　rectifier　side　is　10　times　as　much　as　that　at　inverter　side.　The　key　points＇　overvoltage　values　are　all　below　their　insulation　withstanding　level　and　the　energy　absorbed　by　the　arresters　is　below　the　energy　absorption　ability　under　current　arrester　arrangement.　This　arrangement　is　reasonable.　©　2017,　High　Voltage　Engineering　Editorial　Department　of　CEPRI.　All　right　reserved.