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1、技师1.某对称三相电路的负载作星形连接时线电压为380V，负载阻抗为电阻10W及电抗15W，求负载的相电流为多少？答案:解：Uf=Ul/=380/=220（V）（1.5分）每相阻抗Z为Z=（W）（2分）每相电流有效值If为If=Uf/Z=220/18=12.2（A）（2分）答：每相电流有效值为12.2A。（0.5分）2.如图D-12所示，为一基10kV电杆，每相导线重量为500kg，水平排列，相间距离均为500mm，试求撑铁受力大小，若撑铁采用L40×4的角钢，A3钢的允许应力[s]=157MPa，
2、问强度是否合格。otherstaffoftheCentre.Duringthewar,ZhuwastransferredbacktoJiangxi,andDirectorofthenewOfficeinJingdezhen,JiangxiCommitteeSecretary.Startingin1939servedasrecorderoftheWestNorthOrganization,SecretaryoftheSpecialCommitteeAfterthevictoryofthelongMar
3、ch,hehasbeentheNorthwestOfficeoftheFederationofStateenterprisesMinister,ShenmufuguSARmissions,DirectorofNingxiaCountypartyCommitteeSecretaryandrecorderoftheCountypartyCommitteeSecretary,Ministersand第31页共32页图D-12答案:解：（1）以A为力矩平衡点=0（1.5分）所以（N）（1.5分）（2）校验强
4、度otherstaffoftheCentre.Duringthewar,ZhuwastransferredbacktoJiangxi,andDirectorofthenewOfficeinJingdezhen,JiangxiCommitteeSecretary.Startingin1939servedasrecorderoftheWestNorthOrganization,SecretaryoftheSpecialCommitteeAfterthevictoryofthelongMarch,heha
5、sbeentheNorthwestOfficeoftheFederationofStateenterprisesMinister,ShenmufuguSARmissions,DirectorofNingxiaCountypartyCommitteeSecretaryandrecorderoftheCountypartyCommitteeSecretary,Ministersand第31页共32页杆件截面（mm2）（1.5分）而L40×4角钢面积A1=40×4+(40-4)×4=304（mm2）＞18
6、7.26mm2（1分）答：强度合格。（0.5分）3.某10kV专线线路长15km，最大负载为3000kVA，最大负载利用小时数Tmax=4400，导线每千米长度的电阻为R0=0.16，求每年消耗在导线上的电能？答案:解：S=UI（1分）I=S/(U)=3000/(×10)=173.2（A）（1.5分）R=R0L=0.16×15=2.4（W）（1.5分）DW=3I2RTmax=3×173.22×2.4×4400=950344（kWh）（1.5分）答：一年消耗在导线上的电能为950344kWh。（0.5
7、分）4.某10kV线路所采用的P-15T型绝缘子，其泄漏距离不小于300mm。求其最大泄漏比距是多少？otherstaffoftheCentre.Duringthewar,ZhuwastransferredbacktoJiangxi,andDirectorofthenewOfficeinJingdezhen,JiangxiCommitteeSecretary.Startingin1939servedasrecorderoftheWestNorthOrganization,Secretaryofthe
8、SpecialCommitteeAfterthevictoryofthelongMarch,hehasbeentheNorthwestOfficeoftheFederationofStateenterprisesMinister,ShenmufuguSARmissions,DirectorofNingxiaCountypartyCommitteeSecretaryandrecorderoftheCountypartyCommitteeSecretary,Ministe
