距離保護的基本原理與構成Basicprincipleandcompositionofdistanceprotection階段式距離保護的構成Compositionofsteppeddistanceprotection目錄頁CONTENTSPAGE距離Ⅰ段01ZoneI距離Ⅱ段02ZoneII距離Ⅲ段03ZoneIII距離保護Ⅲ段是本線路的近后備保護和相鄰線路的遠后備保護。距離保護I段和Ⅱ段共同作用，構成本線路的主保護?！啊癐段ZoneIⅡ段ZoneIIⅢ段ZoneIII三段式距離保護，為距離保護的Three-steppeddistanceprotectionisThedistanceprotectionzoneIandzoneIIworktogethertoformthemainprotectionofthisline.DistanceprotectionzoneIIIisthenearbackupprotectionofthislineandtheremotebackupprotectionofadjacentlines.距離Ⅰ段ZoneI01整定阻抗Settingimpedance01按躲過本線路末端短路時的正序阻抗來整定。

即namelySetaccordingtothepositivesequenceimpedancetoavoidtheshortcircuitattheendofthisline.距離Ⅰ段的出口時間大約在10～20ms左右。距離保護Ⅰ段為瞬時動作，即不附加延時。所以，一般距離保護Ⅰ段的動作時限為保護裝置的固有動作時限。對于微機型繼電保護，距離Ⅰ段的動作時限為0s。動作時限Operationtimelimit02DistanceprotectionzoneIisinstantaneousaction,thatis,nodelayisadded.Therefore,theoperationtimelimitofthegeneraldistanceprotectionzoneIistheinherentoperationtimelimitoftheprotectiondevice.Formicrocomputertyperelayprotection,theoperationtimelimitofzoneIis0s.TheexittimefromzoneIisabout10~20ms.02動作時限Operationtimelimit距離保護Ⅰ段不能保護本線路的全長。其保護范圍為本線路全長的80%~85%距離保護保護范圍及時限特性Distanceprotectionrangeandtimelimitcharacteristics動作時限為保護裝置本身的固有動作時間。12DistanceprotectionzoneIcannotprotecttheentirelengthoftheline.Itsprotectionrangeis80%~85%oftheentirelengthofthelineTheoperationtimelimitistheinherentoperationtimeoftheprotectiondeviceitself.距離Ⅱ段ZoneII02距離保護Ⅱ段的保護范圍是本線路的全長，并力求與相鄰下一級快速保護相配合，使距離保護Ⅱ段動作時間盡可能短。TheprotectionrangeofthedistanceprotectionzoneIIistheentirelengthoftheline,andstrivestocooperatewiththeadjacentnext-levelquickprotectiontomaketheoperationtimeofthedistanceprotectionzoneIIasshortaspossible.與下一段線路的距離Ⅰ段相配合

“”整定阻抗Settingimpedance01MatchwiththedistancezoneIofthenextsectionofline應比與之相配合的相鄰保護的動作時限大一個時限級差

一般取/Generallytake“”動作時限Operationtimelimit02Itshouldbeonetimelimitgreaterdifferencethantheoperationtimelimitoftheadjacentprotectionitmatches.距離保護Ⅱ段應保證本線路末端發(fā)生金屬性短路時有足夠的靈敏度。若靈敏度不滿足要求時，應與相鄰下一線路的距離Ⅱ段配合整定?！啊毙ｒ烄`敏度Calibrationsensitivity03ThedistanceprotectionzoneIIshouldensureenoughsensitivitywhenadeadshortoccursattheendoftheline.Ifthesensitivitydoesnotmeettherequirements,itshouldbesetinconjunctionwiththezoneIIofthenextadjacentline.03校驗靈敏度Calibrationsensitivity距離保護保護范圍及時限特性Distanceprotectionrangeandtimelimitcharacteristics1距離保護Ⅱ段的保護范圍為本線路的全長2動作時限比下一相鄰線路Ⅰ段動作時限大一個時限級差。TherangeofdistanceprotectionzoneIIistheentirelengthofthelineTheoperationtimelimitisonetimelimitdifferencegreaterthantheoperationtimelimitofzoneIofthenextadjacentline.距離Ⅲ段ZoneIII0301整定阻抗Settingimpedance距離保護Ⅲ段的動作阻抗按躲過最小負荷阻抗整定TheoperationimpedanceofdistanceprotectionzoneIIIissetaccordingtotheimpedanceavoidingtheminimumload考慮外部短路切除后，在電動機自起動的條件下，保護的第Ⅲ段必須立即返回Aftertheremovaloftheexternalshortcircuit,undertheconditionsofself-startingofthemotor,theprotectionzoneIIImustreturnimmediately.同時還應考慮實際采用的阻抗元件的動作特性Atthesametime,theoperatingcharacteristicsoftheactualimpedanceelementusedshouldalsobeconsidered02動作時限Operationtimelimit按階梯形原則整定比本線路末端母線上所有連接元件后備保護的最大動作時限大一個時間級差。“”Setaccordingtothestepped-curveprincipleItisonetimedifferencegreaterthanthemaximumoperationtimelimitofthebackupprotectionofallconnectedelementsonthebusattheendofthisline.02動作時限Operationtimelimit距離保護保護范圍及時限特性Distanceprotectionrangeandtimelimitcharacteristics1距離保護Ⅲ段的保護范圍較大2動作時限按階梯形原則整定“”DistanceprotectionzoneIIIhasalargerprotectionrangeTheoperationtimelimitissetaccordingtothestepped-curveprinciple階段式距離保護是如何構成的？Howissteppeddistanceprotectionstructured