管母計(jì)算書標(biāo)準(zhǔn)版

,,,,,,110kV管母計(jì)算,,,,

1.計(jì)算條件,,,,,,,,,,

1.1氣象條件,,,,,,,,,,

,最大風(fēng)速VMAX=,,35,M/S,,,,,,

,內(nèi)過(guò)電壓風(fēng)速VN=,,15,M/S,,,,,,

,最熱月最高溫度平均值,,35,度,,,,,,

1.2短路電流峰值,,,,,,,,,,

,三相短路電流I=,,31.5,KA,,,,,,

,短路電流峰值ICH=,,80.325,KA,,,,,,

,,,,,,,,,,,

1.3結(jié)構(gòu)尺寸,,,,,,,,,,

,跨距=,,8,M,,,,,,

,計(jì)算跨距L=,,8,M,,,,,,

,母線相間距a=,,160,CM,,,,,,

,隔離開(kāi)關(guān)觸頭重P=,,25,KG,裝于母線跨距中央,,,,,

,考慮合適的伸縮量，每四或五跨設(shè)一伸縮接頭,,,,,,,,,

1.4管母材料,,,,,,,,,,

,LDRE型鋁鎂合金管,,,,,,,,,

,比重g=,,2.712,g/cm3,,,,,,

,屈服強(qiáng)度>,,196,MPa,,,,,,

,焊接性能>,,130,MPa,,,,,,

,彈性模量>,,1000,MPa,,,,,,

2.管徑選擇,,,,,,,,,,

2.1母線自重產(chǎn)生的垂直彎矩Mcz，手冊(cè)P345查得均布荷載最大彎矩系數(shù)X為,,,,,,,,,0.105,則彎矩為

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

,,,,,,,,,,,

2.2集中荷載產(chǎn)生的垂直彎矩Mcj，手冊(cè)P345查得集中荷載最大彎矩系數(shù)XX為,,,,,,,,,0.158,則彎矩為

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

2.3短路電動(dòng)力產(chǎn)生的水平彎矩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內(nèi)過(guò)電壓下的水平彎矩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),,,,,

選管母φ120/110,,,,,,,,,,

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

,短路狀態(tài)時(shí)母線所承受得最大彎矩及應(yīng)力為,,,,,,,,,

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

,σd=100*Md/W=,,5841.690089,<17000(N/CM2)手冊(cè)P332數(shù)據(jù)，滿足。,,,,,,

3.校驗(yàn),,,,,,,,,,

3.1正常狀態(tài)時(shí)母線所受的最大彎矩,,,,,,,,,,

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

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

,最大風(fēng)速下的水平彎矩Msf,,,,,,,,,

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

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

,母線所承受得最大彎矩及應(yīng)力為,,,,,,,,,

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

,σd=100*M/W=,,1930.113887,<17000(N/CM2)手冊(cè)P332數(shù)據(jù)，滿足。,,,,,,

3.2所址地震基本烈度小于6度，可不校驗(yàn)地震時(shí)所受的最大彎矩和應(yīng)力。,,,,,,,,,,

3.3撓度校驗(yàn),,,,,,,,,,

,母線自重產(chǎn)生的撓度,,,查系數(shù)=,0.644,手冊(cè)查得E=,700000,算得J=,299,

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

,集中荷載產(chǎn)生的撓度,,,查系數(shù)=,1.097,,,,,

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

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

3.4消減微風(fēng)振動(dòng)采取措施：1.在管內(nèi)加裝阻尼線2.結(jié)合靜觸頭安裝動(dòng)力消振器,,,,,,,,,,

3.5結(jié)論選用LDRE-120/110型鋁鎂合金管。,,,,,,,,,,

,,,,,,二、母線支柱絕緣子選擇,,,,

,長(zhǎng)期荷載作用時(shí)的安全系數(shù)2.5；短時(shí)荷載作用時(shí)的安全系數(shù)1.67,,,,,,,,,

,支柱絕緣子高H=,,1.5,直徑D=,0.23,頂端金具h(yuǎn)=,0.12,,,

,,,,,,,,,,,

1.抗彎強(qiáng)度,,,,,,,,,,

1.1正常最大風(fēng),,,,,,,,,,

,導(dǎo)體傳遞水平力Fv=fv*L=,,,88.2,,,,,,

折算至絕緣子頂Fv'=Fv*(H+h)/H=,,,,,95.256,(KG),,,,

,,,,,,,,,,,

絕緣子本身風(fēng)壓折算至頂F''=αv*Kv*D*H/2*VMAX^2/16=,,,,,,,15.8484375,(KG),,

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

1.2短路狀態(tài),,,,,,,,,,

,導(dǎo)體傳遞水平力Fds=(fv'+fd)*L=,,,,345.5154711,,,,,

折算至絕緣子頂F'=Fds*(H+h)/H=,,,,,373.1567088,(KG),,,,

,,,,,,,,,,,

絕緣子本身風(fēng)壓折算至頂F''=αv*Kv*D*H/2*Vn^2/16=,,,,,,,2.9109375,(KG),,

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

2.抗扭強(qiáng)度,,,,,,,,,,

,短路電動(dòng)力和內(nèi)過(guò)電壓風(fēng)速下扭矩,,,,,,,,,

,Ms=(fv'+fd)*