接地电阻计算公式

ρlbdR00.000#DIV/0!ρlbdR00.000#DIV/0!ρLhdAR0#DIV/0!#DIV/0!#DIV/0!计算公式ρSLhdRw40.000#DIV/0!#DIV/0!#DIV/0!计算公式1.接触电势允许值人工接地体工频接地电阻的计算1.单根垂直接地体的接地电阻R0（l》d）2.不同形状水平接地体的接地电阻R0(1)对于扁钢(2)对于等边角钢接触电压和跨步电压1.接触电势允许值ρbtEj3.以水平接地体为主，且边缘闭合的复合接地体的接地电阻40.0000.200581.378#DIV/0!42106.1ln2404?+=hdLLSRWπρπ2112142221210bbb84.0dbbbbbb71.0db2bd4lnl2＝，＝对于等边角钢为角钢边长；，，）（＝为扁钢宽度；对于角钢，＝对于扁钢＝+?dlRpr）（＝ALR+hdLln220prtjbEρ＝25.0250+2.跨步电势允许值ImaxIzKf1Kf1=0.5186409320Kf2=0.ndSKnKdKs4.8230.03034900.2971.0001.074ndSKnKdKs6.0000.03034900.2190.9001.074KjEwEjm0.319#######407.550孔的规格（长取1，方取0）1.0003.接地网的最大接触电势1.长孔3.最大接触电势2.跨步电势允许值ρbtEk40.0000.200648.4602.厂外发生接地短路IzKf2#DIV/0!1.入地短路电流计算1.厂内发生接地短路I9320.004660.0002.方孔REw1276.8400.274I0.0002.接地装置的电位ItjbEρ＝25.0250+tkbEρ+=250））（（1max1fzKIII=）（21fzKII=IREw=)10(137.0545.0+=nKnn长孔：)9(096.097.0+=nKnn长孔：)9(047.003.1+=nKnn方孔：)10(105.055.0+=nKnn方孔：0.1=dK长孔：d102.1＝方孔：dKSsK4023.023.1＝当埋深h＝0.8m时hLL1SdKk1Kk2AB0.857924434900.0300.0660.0641.3761.296EwEkm1Ekm2#######83.94781.7104.接地网的最大跨步电势wjjmEKE=SsK4023.023.1＝)(28.102.9125.01ln476.041.0dSLLSLLLkK+=C0.021ρlbdR00.000#DIV/0!ρlbdR00.000#DIV/0!ρLhdAR0#DIV/0!#DIV/0!#DIV/0!计算公式ρSLhdRw40.0008295.1601775.5100.8000.0300.259#DIV/0!#DIV/0!计算公式1.接触电势允许值#DIV/0!400人工接地体工频接地电阻的计算1.单根垂直接地体的接地电阻R0（l》d）2.不同形状水平接地体的接地电阻R0(1)对于扁钢(2)对于等边角钢0.200541.1283.以水平接地体为主，且边缘闭合的复合接地体的接地电阻接触电压和跨步电压1.接触电势允许值ρftUt42106.1ln2404?+=hdLLSRWπρπ2112142221210bbb84.0dbbbbbb71.0db2bd4lnl2＝，＝对于等边角钢为角钢边长；，，）（＝为扁钢宽度；对于角钢，＝对于扁钢＝+?dlRpr）（＝ALR+hdLln220prttfUρ＝17.0174+2.跨步电势允许值ImaxIzKf1Kf1=0.5186409320.00.5Kf2=0.1孔的规格ndL1L2S07.4200.0308275KdKLKnKs1.1841.0000.1811.045485.2453.最大接触电势UgKtmaxUtmax3.均压带等间距布置时接地网的最大接触电势及最大跨步电势（1）均压带等间距布置时接地网的最大接触电势1.最大接触电位差系数Ktmax2172.4920.223I9320.0000.18388.002172.4920.223UgI1.入地短路电流计算1.厂内发生接地短路I4660.002000.264404.8198388.000.259R2.厂外发生接地短路IzKf22.接地装置的电位ρftUs#DIV/0!2.跨步电势允许值ttfUρ＝17.0174+））（（1max1fzKIII=）（21fzKII=IRUg=tsfUρ＝17.0174+421/1.1LLKL=长孔：dKdlg225.0841.0=0.1=LK方孔：nKn/776.0076.0+=SKslg414.0234.0+=gttUKUmaxmax=接地网的规格NLL0hd11625.51526.930.800.030Snβα8295.167.4200.2720.331n1n2mhdL11.000L2SKtdKthKtlK'tmax#DIV/0!0.257#DIV/0!#DIV/0!KtnKtsKtmaxUg#DIV/0!0.054#DIV/0!#######n1n2hdL1L2SmKsdKshKsLK'smax1.0000.5740.000#DIV/0!1.128KsnKssKsmaxUg#DIV/0!0.070#DIV/0!#######Usmax#DIV/0!（2）均压带不等间距布置时接地网的最大跨步电势Utmax#DIV/0!Utmax（1）均压带不等间距布置时接地网的最大接触电势4.均压带不等间距布置时接地网的最大跨步电势1.最大跨步电位差系数Ksmax153.8800.0712172.4920.0712.最大跨步电位差UgKsmax（2）均压带等间距布置时接地网的最大跨步电势2/14))((200SLLLn=n1.0=)()(35.03014.122Snn=dhSThhThhsK4.20)2/()2/(2max/ln)5.1(2222+++=gssUKUmaxmax=tstnttLthtdtKKKKKKKmaxmax'=gttUKUmaxmax=sssnssLshsdsKKKKKKKmaxmax'=gssUKUmaxmax=6/522.0401.0dKtd+=5095.0257.0hKth=)/(002.0168.012LLKtL=3021.240max837.2'htK+=)/(132.0217.0021.01212nnKnntn+=8410.0054.0SKts+=)(12LL)(12nn364.0574.0dKsd=)/(011.0741.012LLKsL=mKs/072.1056.0'max+=1212/234.0849.0nnKsn+=SKss08.107.0+=)(12LL)(12nnheKsh789.2864.383=)(12LL)(12nn)(12LL)(12nn