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时间:2020-04-01
《电流保护作业和答案.ppt》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、习题1图示网络中具体参数如图所示。计算:当线路长度为80km、40km和20km时保护1电流速断保护的定值,并校验灵敏度。第二章作业Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.解:线路长80km时:1、定值计算:2、时间:Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2
2、004-2011AsposePtyLtd.解:线路长80km时:3、灵敏度校验:满足要求Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.解:线路长40km时:1、定值计算:2、时间:Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.解
3、:线路长40km时:3、灵敏度校验:不满足要求Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.解:线路长20km时:1、定值计算:2、时间:Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.解:线路长20km时:3、灵敏度校验:短线路
4、没有保护范围Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.习题2图示网络中,线路AB装有III式电流保护,线路BC装有II式电流保护,均采用两相星形接线方式。具体参数如图所示。计算:线路AB各段保护动作电流和动作时限,并校验各段灵敏度。Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copy
5、right2004-2011AsposePtyLtd.解:I段(线路AB):1、定值计算:2、时间:3、灵敏度校验:Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.解:II段(线路AB):1、定值计算:2、时间:3、灵敏度校验:Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright
6、2004-2011AsposePtyLtd.解:III段(线路AB):1、定值计算:2、时间:3、灵敏度校验:近后备:远后备:Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.特例解:BC的I段(线路-变压器组):1、定值计算:2、时间:Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyr
7、ight2004-2011AsposePtyLtd.解:I段(线路BC):3、灵敏度校验:对于线路-变压器组,电流速断保护能保护线路全长Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.习题3如图所示,对保护1进行三段式相间电流保护的整定计算。电源相电势为,线路阻抗为0.4Ω/km,阻抗角为70°,AB线最大负荷电流为170A。Evaluationonly.CreatedwithAsp
8、ose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.解:电流保护I段1、定值计算:Evaluationonly.Createdw
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