管母计算书标准版

,,,,,,110kV管母计算,,,,

1.计算条件,,,,,,,,,,

1.1气象条件,,,,,,,,,,

,最大风速VMAX=,,35,M/S,,,,,,

,内过电压风速VN=,,15,M/S,,,,,,

,最热月最高温度平均值,,35,度,,,,,,

1.2短路电流峰值,,,,,,,,,,

,三相短路电流I=,,31.5,KA,,,,,,

,短路电流峰值ICH=,,80.325,KA,,,,,,

,,,,,,,,,,,

1.3结构尺寸,,,,,,,,,,

,跨距=,,8,M,,,,,,

,计算跨距L=,,8,M,,,,,,

,母线相间距a=,,160,CM,,,,,,

,隔离开关触头重P=,,25,KG,装于母线跨距中央,,,,,

,考虑合适的伸缩量，每四或五跨设一伸缩接头,,,,,,,,,

1.4管母材料,,,,,,,,,,

,LDRE型铝镁合金管,,,,,,,,,

,比重g=,,2.712,g/cm3,,,,,,

,屈服强度>,,196,MPa,,,,,,

,焊接性能>,,130,MPa,,,,,,

,弹性模量>,,1000,MPa,,,,,,

2.管径选择,,,,,,,,,,

2.1母线自重产生的垂直弯矩Mcz，手册P345查得均布荷载最大弯矩系数X为,,,,,,,,,0.105,则弯矩为

,Mcz=X*9.8*q*L*L=,,X*9.8*q1*L*L=,,,140202.1555,*(D^2-d^2),(N.M),"D,d单位为M",

,,,,,,,,,,,

2.2集中荷载产生的垂直弯矩Mcj，手册P345查得集中荷载最大弯矩系数XX为,,,,,,,,,0.158,则弯矩为

,Mcj=XX*9.8*p*L=,,309.68,(N.M),,,,,,

2.3短路电动力产生的水平弯矩Msd,,,,,,,,,,

,fd=1.76*ICH^2/a*β=,,41.16443389,(KG/M),,,,,,

,Msd=X*9.8*fd*L*L=,,,2710.924958,(N.M),,,,,

2.4内过电压下的水平弯矩Msf',,,,,,,,,,

,fv'=αv*Kv*D*Vn*Vn/16=,,,16.875,D(KG/M),,,,,

,Msf'=X*9.8*fv'*L*L=,,,1111.32,D(N.M),,,,,

选管母φ120/110,,,,,,,,,,

,D=,0.12,d=,0.11,,算得W=0.0982*(D^4-d^4)/D*1000000=,,,,49.87741667

,短路状态时母线所承受得最大弯矩及应力为,,,,,,,,,

,Md=ρ(Msd+Msf'，Mcz+Mcj)=,,,,2913.684106,(N.M),,,,

,σd=100*Md/W=,,5841.690089,<17000(N/CM2)手册P332数据，满足。,,,,,,

3.校验,,,,,,,,,,

3.1正常状态时母线所受的最大弯矩,,,,,,,,,,

,Mcz=,322.4649577,(N.M),,,,,,,

,Mcj=,309.68,(N.M),,,,,,,

,最大风速下的水平弯矩Msf,,,,,,,,,

,fv=αv*Kv*D*VMAX^2/16=,,,11.025,(KG/M),,,,,

,Msf=X*9.8*fv*L*L=,,,726.0624,(N.M),,,,,

,母线所承受得最大弯矩及应力为,,,,,,,,,

,M=ρ(Msf，Mcz+Mcj)=,,,962.6909453,(N.M),,,,,

,σd=100*M/W=,,1930.113887,<17000(N/CM2)手册P332数据，满足。,,,,,,

3.2所址地震基本烈度小于6度，可不校验地震时所受的最大弯矩和应力。,,,,,,,,,,

3.3挠度校验,,,,,,,,,,

,母线自重产生的挠度,,,查系数=,0.644,手册查得E=,700000,算得J=,299,

,Y1=0.644*1.12*q1*L^4/100/E/J=,,,,0.691165079,,,,,

,集中荷载产生的挠度,,,查系数=,1.097,,,,,

,Y2=1.097*p*L^3/100/E/J=,,,,0.670883899,,,,,

,Y=Y1+Y2=,,1.362048978,<,D=,12,(CM)满足。,,,

3.4消减微风振动采取措施：1.在管内加装阻尼线2.结合静触头安装动力消振器,,,,,,,,,,

3.5结论选用LDRE-120/110型铝镁合金管。,,,,,,,,,,

,,,,,,二、母线支柱绝缘子选择,,,,

,长期荷载作用时的安全系数2.5；短时荷载作用时的安全系数1.67,,,,,,,,,

,支柱绝缘子高H=,,1.5,直径D=,0.23,顶端金具h=,0.12,,,

,,,,,,,,,,,

1.抗弯强度,,,,,,,,,,

1.1正常最大风,,,,,,,,,,

,导体传递水平力Fv=fv*L=,,,88.2,,,,,,

折算至绝缘子顶Fv'=Fv*(H+h)/H=,,,,,95.256,(KG),,,,

,,,,,,,,,,,

绝缘子本身风压折算至顶F''=αv*Kv*D*H/2*VMAX^2/16=,,,,,,,15.8484375,(KG),,

,总受力F=2.5*(Fv'+F'')=,,,277.7610938,(KG),,,,,

1.2短路状态,,,,,,,,,,

,导体传递水平力Fds=(fv'+fd)*L=,,,,345.5154711,,,,,

折算至绝缘子顶F'=Fds*(H+h)/H=,,,,,373.1567088,(KG),,,,

,,,,,,,,,,,

绝缘子本身风压折算至顶F''=αv*Kv*D*H/2*Vn^2/16=,,,,,,,2.9109375,(KG),,

,总受力F=1.67*(F'+F'')=,,,628.0329693,(KG),,,,,

2.抗扭强度,,,,,,,,,,

,短路电动力和内过电压风速下扭矩,,,,,,,,,

,Ms=(fv'+fd)*