設計院短路電流計算表

,短路電流計算,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,,10(6)/0.4KV變壓器高壓側(cè)系統(tǒng)短路容量與高壓側(cè)阻抗、相保阻抗（歸算到400V）的數(shù)值關(guān)系（摘自《工業(yè)與民用配電設計手冊》第三版）表4-21,,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,,高壓側(cè)短路容量SS(MVA),10,20,30,50,75,100,200,300,∞,,

,網(wǎng)絡等效電路圖：,,,,,,,,,,,,,,,,,,,ZS,16.00,8.00,5.33,3.20,2.13,1.60,0.80,0.53,0,,

,,,,,,,,,,,,,,,,,,,,Xs,15.92,7.96,5.30,3.18,2.12,1.59,0.80,0.53,0,,

,,,,,,,,,,,,,,,,,,,,Rs,1.59,0.80,0.53,0.32,0.21,0.16,0.08,0.05,0,,

,,,,,,,,,,,,,,,,,,,,Rphp.s,1.06,0.53,0.35,0.21,0.14,0.11,0.05,0.03,0,,

,,,,,,,,,,,,,,,,,,,,Xphp.s,10.61,5.31,3.53,2.12,1.41,1.06,0.53,0.35,0,,

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,1,"D,yn11",,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,2,"Y,yn0",,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,,SCB10系列10（6）/0.4kV變壓器的阻抗平均值（歸算到400V側(cè)）（摘自《工業(yè)與民用配電設計手冊》第三版）表4-23,,,,,,,,,,,

,,,,,,,,,輸入工程參數(shù)：,,,,,,,,,,,型號,電壓（kV）,容量（Kva）,阻抗電壓（%）,電阻（mΩ）,,電抗（mΩ）,,電阻（mΩ）,,電抗（mΩ）,

,,,,,,,,,,,,,,,,,,,,SCB10,10/0.4,,,"D,yn11",,,,"Y,yn0",,,

,,,,,,,,,10（6）kV側(cè)系統(tǒng)短路容量S''（MVA）,,300,,,,,,,,,,,,,正負序,相保,正負序,相保,正負序,相保,正負序,相保

,,,,,,,,,,,,,,,,,,,,,,,,R,Rphp·p,X,Xphp·p,R,Rphp·p,X,Xphp·p

,,,,,,,,,SCB10系列10（6）/0.4kV變壓器容量SrT（KVA),,2000,,變壓器接線形式,,"D,yn11",,,,,,,630,6,2.26,2.26,15.07,15.07,2.26,5.32,15.07,75.98

,,,,,,,,,,,,,,,,,,,,,,800,6,1.65,1.65,11.89,11.89,1.65,3.75,11.89,57.49

,,,,,,,,,銅母線m規(guī)格,,3[2(100X10)]+100X10,,母線長度（m）,,5,,,,,,,1000,6,1.22,1.22,9.52,9.52,1.22,3.39,9.52,42.71

,,,,,,,,,,,,,,,,,,,,,,1250,6,0.93,0.93,7.62,7.62,0.93,2.78,7.62,31.41

,,,,,,,,,交聯(lián)銅芯電纜L1,,4x185,,線路L1長度（m）,,100,,,,,,,1600,6,0.69,0.69,5.96,5.96,0.69,1.94,5.96,23.31

,,,,,,,,,,,,,,,,,,,,,,2000,6,0.53,0.53,4.77,4.77,0.53,1.32,4.77,18.61

,,,,,,,,,交聯(lián)銅芯電纜L2,,4x10,,線路L2長度（m）,,50,,,,,,,2500,6,0.4,0.4,3.82,3.82,0.4,0.99,3.82,14.78

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

,,,,,,,,,交聯(lián)銅芯電纜L3,,4x35,,線路L3長度（m）,,60,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,,銅低壓母線單位長度阻抗值（摘自《工業(yè)與民用配電設計手冊》第三版）表4-24,,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,,銅母線規(guī)格（mm）,R',R'php=R'+R'p,X',,X'php,,,,,,

,,,,,,,,,,,,,,,,,,,,,,,D(mm),,D(mm),,,,,,

,,,,,,,,,,,,,,,,,,,,,,,250,350,250,350,,,,,

,,,,,,,,,,,,,,,,,,,1,3[2(125X10)]+125X10,0.0084,0.0252,0.0882,0.1020,0.1902,0.2064,,,,,

,,,,,,,,,,,,,,,,,,,2,3[2(125X10)]+80X10,0.0084,0.0324,0.0882,0.1020,0.2040,0.2202,,,,,

,,,,,,,,,,,,,,,,,,,3,4(125X10),0.0168,0.0336,0.0882,0.1020,0.1902,0.2064,,,,,

,,,,,,,,,,,,,,,,,,,4,3(125X10)+80X8,0.0168,0.0468,0.0882,0.1020,0.2046,0.2214,,,,,

,低壓三相和單相接地故障電流計算表,,,,,,,,,,,,,,,,,,5,3(125X10)+80X6.3,0.0168,0.0528,0.0882,0.1020,0.2058,0.2220,,,,,

,序號,電路元件,短路點,元件阻抗(mΩ),,,,短路點阻抗(mΩ),,,,三相短路電流(kA),,單相接地故障電流(kA),,,,,6,4[2(100X10)],0.0096,0.0192,0.0936,0.1086,0.2016,0.2196,,,,,

,,,,R,X,Rphp,Xphp,,,,,,,,,,,,7,3[2(100X10)]+100X10,0.0096,0.2880,0.0936,0.1086,0.2016,0.2196,,,,,

,1,系統(tǒng)S,,0.050,0.530,0.030,0.350,,,,,,,,,,,,8,3[2(100X10)]+80X8,0.0096,0.0396,0.0936,0.1086,0.2100,0.2280,,,,,

,2,變壓器T,,0.530,4.770,0.530,4.770,,,,,,,,,,,,9,4(100x10),0.0250,0.0500,0.1560,0.1810,0.3360,0.3660,,,,,

,3,母線m,,0.048,0.543,1.440,1.098,,,,,,,,,,,,10,3(100x10)+80x8,0.0250,0.0560,0.1560,0.1810,0.3500,0.3800,,,,,

,4,1+2+3,k1,0.628,5.843,2.000,6.218,5.88,,6.53,,39.14,,33.682,,,,,11,4(80x8),0.0310,0.0620,0.1700,0.1950,0.3640,0.3940,,,,,

,5,線路L1,,9.500,7.700,28.500,20.000,,,,,,,,,,,,12,3(80x8)+63x6.3,0.0310,0.0780,0.1700,0.1950,0.3820,0.4120,,,,,

,6,4+5,k2,10.128,13.543,30.500,26.218,16.91,,40.22,,13.60,,5.470,,,,,13,3(80x8)+50x5,0.0310,0.1040,0.1700,0.1950,0.3940,0.4230,,,,,

,7,線路L2,,87.700,4.250,263.100,13.000,,,,,,,,,,,,,,,,,,,,,,,,

,8,6+7,k3,97.828,17.793,293.600,39.218,99.43,,296.21,,2.31,,0.743,,,,,,,,,,,,,,,,,

,9,線路L3,,30.060,4.800,90.180,14.400,,,,,,,,,,,,,,,,,,,,,,,,

,10,4+9,k4,30.688,10.643,92.180,20.618,32.48,,94.46,,7.08,,2.329,,,,,,,,,,,,,,,,,

,注：表中Un=380V,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,,交聯(lián)銅芯電纜線路單位長度阻抗（摘自《工業(yè)與民用配電設計手冊》第三版）表4-25,,,單位：mΩ/m,,,,,,,,

,,,,,,,,,,,,,,,,,,,,線徑,R',R'php,X',X'php,,,,,,,

,根據(jù)三相短路電流計算，對各區(qū)域開關(guān)的分斷能力選擇,,,,,,,,,,,,,,,,,,1,4x185,0.095,0.285,0.077,0.2,,,,,,,

,1,"變電所低壓配電柜內(nèi)（QF1,QF2,QF3）斷路器的額定運行短路分斷能力（或熔斷器的分斷能力）不得小于",,,,,,,,,,,39.14,,（kA),,,,2,3x185+1x95,0.095,0.42,0.077,0.21,,,,,,,

,2,樓層配電箱內(nèi)（QF4）斷路器的額定運行短路分斷能力（或熔斷器的分斷能力）不得小于,,,,,,,,,,,13.60,,（kA),,,,3,4x150,0.117,0.351,0.077,0.2,,,,,,,

,3,供電末端配電箱內(nèi)（QF5）斷路器的額定運行短路分斷能力（或熔斷器的分斷能力）不得小于,,,,,,,,,,,2.31,,（kA),,,,4,3x150+1x70,0.117,0.552,0.077,0.21,,,,,,,

,4,變電所放射式供電末端配電箱內(nèi)（QF6）斷路器的額定運行短路分斷能力（或熔斷器的分斷能力）不得小于,,,,,,,,,,,7.08,,（kA),,,,5,4x120,0.146,0.438,0.076,0.21,,,,,,,

,,,,,,,,,,,,,,,,,,,6,3x120+1x70,0.146,0.596,0.076,0.21,,,,,,,

,,,,,,,,,,,,,,,,,,,7,4x95,0.185,0.555,0.077,0.23,,,,,,,

,,,,,,,,,,,,,,,,,,,8,3x95+1x50,0.185,0.804,0.077,0.21,,,,,,,

,,,,,,,,,,,,,,,,,,,9,4x70,0.251,0.753,0.078,0.22,,,,,,,

,本計算書適用范圍（本說明僅供設計師參考，不打?。?,,,,,,,,,,,,,,,,,10,3x70+1x35,0.251,1.128,0.078,0.23,,,,,,,

,2

適用于10(6)kV/0.4kV變配電系統(tǒng)的低壓網(wǎng)絡短路電流計算；,,,,,,,,,,,,,,,,,,11,4x50,0.351,1.053,0.079,0.21,,,,,,,

,2

按遠離發(fā)電機端，即無限大電源容量的網(wǎng)絡短路進行計算；,,,,,,,,,,,,,,,,,,12,3x50+1x25,0.351,1.58,0.079,0.22,,,,,,,

,2

計入短路電路各元件的有效電阻，但短路點的電弧電阻、導線連接點、開關(guān)設備和電器的接觸電阻忽略不計；,,,,,,,,,,,,,,,,,,13,4x35,0.501,1.503,0.08,0.24,,,,,,,

,2

電路電阻較大，不考慮直流分量；,,,,,,,,,,,,,,,,,,14,3x35+1x16,0.501,2.397,0.08,0.25,,,,,,,

,2

導體計算溫度取20℃；,,,,,,,,,,,,,,,,,,15,4x25,0.702,2.106,0.08,0.23,,,,,,,

,2

低壓網(wǎng)絡配電形式與《低壓網(wǎng)絡短路電流計算電路》圖匹配；,,,,,,,,,,,,,,,,,,16,3x25+1x16,0.702,2.699,0.08,0.25,,,,,,,

,2

變壓器為SCB10系列10（6）/0.4kV，阻抗電壓為6%；,,,,,,,,,,,,,,,,,,17,4x16,1.097,3.291,0.082,0.25,,,,,,,

,2

不考慮短路點電動機的影響。,,,,,,,,,,,,,,,,,,18,3x16+1x10,1.097,4.277,0.082,0.25,,,,,,,

,

本計算書適用于滿足上述要求的低壓網(wǎng)絡短路電流計算。,,,,,,,,,,,,,,,,,,19,4x10,1.754,5.262,0.085,0.26,,,,,,,

,,,,,,,,,,,,,,,,,,,20,3x10+1x6,1.754,6.932,0.085,0.26,,,,,,,

,,,,,,,,,,,,,,,,,,,21,4x6,2.867,8.601,0.092,0.26,,,,,,,

,,,,,,,,,,,,,,,,,,,22,3x6+1x4,2.867,10.751,0.092,0.26,,,,,,,

,,,,,,,,,,,,,,,,,,,23,4x4,4.3,12.9,0.097,0.28,,,,,,,

,,,,,,,,,,,,,,,,,,,24,3x4+1x2.5,4.3,16.77,0.097,0.28,,,,,,,

,,,,,,,,,,,,,,,,,,,25,4x2.5,6.88,20.64,0.097,0.29,,,,,,,

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

,,