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1、技師1.某對(duì)稱三相電路的負(fù)載作星形連接時(shí)線電壓為380V，負(fù)載阻抗為電阻10W及電抗15W，求負(fù)載的相電流為多少？答案:解：Uf=Ul/=380/=220（V）（1.5分）每相阻抗Z為Z=（W）（2分）每相電流有效值If為If=Uf/Z=220/18=12.2（A）（2分）答：每相電流有效值為12.2A。（0.5分）2.如圖D-12所示，為一基10kV電桿，每相導(dǎo)線重量為500kg，水平排列，相間距離均為500mm，試求撐鐵受力大小，若撐鐵采用L40×4的角鋼，A3鋼的允許應(yīng)力[s]=157MPa，
2、問強(qiáng)度是否合格。otherstaffoftheCentre.Duringthewar,ZhuwastransferredbacktoJiangxi,andDirectorofthenewOfficeinJingdezhen,JiangxiCommitteeSecretary.Startingin1939servedasrecorderoftheWestNorthOrganization,SecretaryoftheSpecialCommitteeAfterthevictoryofthelongMar
3、ch,hehasbeentheNorthwestOfficeoftheFederationofStateenterprisesMinister,ShenmufuguSARmissions,DirectorofNingxiaCountypartyCommitteeSecretaryandrecorderoftheCountypartyCommitteeSecretary,Ministersand第31頁共32頁圖D-12答案:解：（1）以A為力矩平衡點(diǎn)=0（1.5分）所以（N）（1.5分）（2）校驗(yàn)強(qiáng)
4、度otherstaffoftheCentre.Duringthewar,ZhuwastransferredbacktoJiangxi,andDirectorofthenewOfficeinJingdezhen,JiangxiCommitteeSecretary.Startingin1939servedasrecorderoftheWestNorthOrganization,SecretaryoftheSpecialCommitteeAfterthevictoryofthelongMarch,heha
5、sbeentheNorthwestOfficeoftheFederationofStateenterprisesMinister,ShenmufuguSARmissions,DirectorofNingxiaCountypartyCommitteeSecretaryandrecorderoftheCountypartyCommitteeSecretary,Ministersand第31頁共32頁桿件截面（mm2）（1.5分）而L40×4角鋼面積A1=40×4+(40-4)×4=304（mm2）＞18
6、7.26mm2（1分）答：強(qiáng)度合格。（0.5分）3.某10kV專線線路長15km，最大負(fù)載為3000kVA，最大負(fù)載利用小時(shí)數(shù)Tmax=4400，導(dǎo)線每千米長度的電阻為R0=0.16，求每年消耗在導(dǎo)線上的電能？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：一年消耗在導(dǎo)線上的電能為950344kWh。（0.5
7、分）4.某10kV線路所采用的P-15T型絕緣子，其泄漏距離不小于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
