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1、花秋二矿下井电缆热稳定校验、L3校验彳 960m450r1 l?70mlkzx| 270r r235rrn2L_335/IC.5kv6300KVAL1L2L3(计算电路图)取Sb =100MVAlb=5.5KA已知上级电源短路容量 Sks=3819MVASb100V *Xs - 0.0262Sks 3819架空线 LGJ-120,12KM, Xx0.0292Xx* 0.0292 X 120.35046300KVA变压器的相对基准电抗 X*“a 兰空空型1.19100 Sn.t 100 6.3查表(2-2-2)煤矿电工手册(矿井供电)(上)X 0.08/KM查表(2-2-13)R1 0.11/k
2、m (150mm2)R2 0.24/km (70mrn)L1 :X*ei1 X L -Sl0.08X 0.96 X 0.0697Ub210.5汇10.5L2 :X* ei2 0.08 X 0.45 X 1000.032710.50.5L1 :R*ei1 R L0.11 X 0.960.1056L2 :R*e2 0.24 X 0.450.108(等值电路图)、R =0.1056+0.108=0.2136 X* =0.0262+0.3504+1.19+0.0697+0.0327=1.669Z* 二.0.21362 1.6692 =1.6826Id3= Ib =Z Z*= 1.:826 =3.269
3、(KA)查表(10-3-3)C=93.4tf=0.65s公式(10-3-8) Ami n_ I d3 乜=3.269 X =28.2口口2 c93.4选择50mm2电缆供电满足要求、L2校验、R =0.1056、X* =0.0262+0.3504+1.19+0.0697=1.6363 Z* 二 ,0.1056 1.6363 =1.6397|d3=- =西=3.354(KA) 瓦 Z* 1.6397查表(10-3-3) C=93.4tf=0.65s公式(10-3-8) Amin- I d3 乜=3.354 x =28.9mm2c93.4选择70mm2电缆供电满足要求、L3校验 R* =0-x* =0.0262+0.3504+1.19=1.5666 Z*02 1.56662 =1.56663|bd = 一Z Z5.51.5666=3.51(KA)查表(10-3-3) C=93.4tf=0.65s3公式(10-3-8) Amin- I d逹=3.51 xc93.42=30.2mm选择150 mm2电缆供电满足要求