井下短路电流计算要点

1、山西煤销集团古县东瑞煤业有限公司井下供电系统整定计算书二零一二年七月短路电流计算1、电源系统电抗：取电源系统短路容量 Ss =50MVAXs 二 Uav = 10.52 =2.205SS50折算到660V侧/ 、2 2U av20.69 )Xs=Xs，=2.205 疋1=0.0095220IU av100.5 )2、架空线路阻抗：宝丰至东瑞线：LGJ-240/30 钢芯铝绞线，4.286km电抗：X =x0 L =0.369 4.286 = 1.582电阻：R=r0 L =0.130 4.286 =0.5572折算到660V 侧f、22iUav2 !(0.69宀X = X1.5820.0068

2、31 1JUav1 丿110.5 丿r=r J 仏=0.5572= 0.0024.1JUav1 丿110.5 丿3、高压电缆阻抗：高压电缆型号：MYJV42-3 X 70电抗：X =x0 L =0.0087.4 = 0.0032Q电阻：R=r0 L =0.307 7.4 = 0.12280折算到660V 侧iU2/、2X =X=0.0032=0.00013820叽1丿110.5丿2R=Rav2 ) =0.1228 汇 0.69 | =0.00053030叽丿110.5丿ii4、变压器电抗：由变压器技术参数查表得KBSGZY-500变压器阻抗为:XT =0.0427“Rt =0.0068由变压器

3、技术参数查表得KBSGZY-630变压器阻抗为:XT =0.0416 门Rt = 0.0056 15、清煤斜巷最小短路电流计算：(1) 电缆 MY-3 X 50 共 60m，电缆 MY-3 X 25 共 150m 电缆 MY-3 X 16 共 20m(2) 低压电缆阻抗X1 =x0 L =0.081 0.06 = 0.00486R1 二 r0 L = 0.4484 0.06 = 0.026904X2 =x0 L = 0.088 0.15 = 0.0132门R2 =r0 L =0.8638 0.15 = 0.12957X3 二 x0 L =0.09 0.02 =0.0018R3 =r L =0.

4、369 0.02=0.02738(3) 短路点短路回路总阻抗X、 = 0.009522 +0.00683 + 0.0001382 +0.0427 + 0.00486 +0.0132+0.0018=0.079 QR ,二 0.0024 + 0.0005303 + 0.0068 + 0.026904 + 0.12957 + 0.02738 =0.1936 Q二 Xt rI = 0.07920.19362 = 0.20906 Q690.3 0.20906(4) 短路电流计算= 1905.5Aav2Z-1650.2A2 0.209066、回风巷刷扩最小短路电流计算:(1) 电缆 MY-3 X 70 共

5、 400m,电缆 MY-3 X 25 共 200m(2) 低压电缆阻抗X = x0 L =0.078 0.4 = 0.0312.|R1 =r0 L =0.3151 0.4 二 0.12604X2 二 x0 L =0.088 0.2 =0.0176R2 二 r0 L =0.8638 0.2=0.17276(3) 短路点短路回路总阻抗X 一、= 0.009522 + 0.00683 + 0.0001382 + 0.0427 + 0.0312 + 0.0176 =0.1079 QR -、= 0.0024 + 0.0005303 + 0.0068 + 0.12604 + 0.17276 = 0.308

6、54 QX、二 Xt R2 二.0.10792 0.308542 = 0.3269 Q(4) 短路电流计算Uav690.3 0.3269= 1218.6AIs2 二2Z6902 0.3269=1055.3A7、1米皮带最小短路电流计算：(1) 电缆 MY-3 X 50 共 200m,电缆 MY-3 X 25 共 10m(2) 低压电缆阻抗Xx。L=0.081 0.2=0.0162R1 二 r0 L =0.4484 0.2 =0.08698X2 = x。L= 0.088 0.01 二 0.000886 1R2 = r L = 0.8638 0.01 = 0.008638.1(3) 短路点短路回路

7、总阻抗X、二 0.009522 + 0.00683 + 0.0001382 +0.0427 +0.0162+0.000886 =0.07615QRv = 0.0024 + 0.0005303 + 0.0068 + 0.08698 + 0.008638 = 0.1081 Qh；f0.076152 0.10812 = 0.1322Q(4) 短路电流计算i S3)=Uav3690.3 0.1322= 3013.7Aav6902 0.1322-2609.9A&绕道刷扩最小短路电流计算：(1) 电缆 MY-3 X 50 共 220m,电缆 MY-3 X 35 共 150m电缆 MY-3 X 25 共 1

8、00m(2) 低压电缆阻抗X1 =x0 L =0.081 0.22 = 0.01782R1 =r0 L = 0.4484 0.22 = 0.098648X2=x0 L =0.084 0.15 = 0.0126门R2 =r0 L = 0.616 0.15 = 0.0924X3 =x0 L = 0.088 0.1 =0.0088R3 二 r。L= 0.8638 0.1 二 0.086381(3) 短路点短路回路总阻抗X 為-0.009522 + 0.00683 + 0.0001382 + 0.0427 + 0.01782 + 0.0126 + 0.0088 =0.09842 QR 二 0.0024

9、 + 0.0005303 + 0.0068 + 0.098648 + 0.0924 + 0.08638 =0.287158 Q27二 0.0984220.2871582 =0.3036Q(4) 短路电流计算Is二Uav6903Z.3 0.3036= 1312.2AUav6901136.33A2 0.30369、轨道巷刷扩最小短路电流计算：(1) 电缆 MY-3 X 50 共 550m,电缆 MY-3 X 25 共 50m(2) 低压电缆阻抗X1 = x0 L 二 0.081 0.55 二 0.04455 1r1 =r0 L =0.4484 0.55 = 0.24662X2 =x0 L =0.0

10、88 0.05 = 0.00405R2 =r L =0.8638 0.05 =0.04319(3) 短路点短路回路总阻抗X ,二 0.009522 + 0.00683 + 0.0001382 +0.0416 + 0.04455+0.00405 =0.1069 QR , 二 0.0024 + 0.0005303 + 0.0056 + 0.24662 + 0.04319 = 0.29835 Q0.106920.29 8 352 = 0.3169 Q(4) 短路电流计算690.3 0.3169= 1257.0AIavU6902 0.3169-1088.6A10、中部水仓最小短路电流计算：(1) 电缆

11、 MY-3 X 50 共 900m,电缆 MY-3 X 25 共 20m(2) 低压电缆阻抗X4 = xo L = 0.081 0.9 = 0.729.1R,二 r0 L =0.4484 0.9 =0.40365X2 = x0 L = 0.088 0.02 = 0.00176.|R2 二 r0 L =0.8638 0.02 =0.017276(3) 短路点短路回路总阻抗X = 0.009522 + 0.00683 + 0.0001382 + 0.0416 + 0.729 + 0.40365=0.1326 QR、= 0.0024 + 0.0005303 + 0.0056 +0.00176 + 0

12、.017276 =0.4294 Q=0.132620.42942 =0.4494 Q(4) 短路电流计算av690.3 0.4494= 886.5AUav6902 0.4494二 767.7A11、中央水泵房最小短路电流计算:(1) 电缆 MY-3 X 70 共 20m，电缆 MY-3 X 35 共 30m电缆 MY-3 X 16 共 30m(2) 低压电缆阻抗X1 =x0 L = 0.075 0.02 =0.00156R1 二 r。L =0.3151 0.02 =0.0063X2 L =0.084 0.03=0.00252R2 =r0 L =0.616 0.03 = 0.01848X3 二

13、x。L =0.09 0.03 二 0.0027 1R3 = r L =1.369 0.03 = 0.0411.1(3) 短路点短路回路总阻抗X.= 0.009522 + 0.00683 + 0.0001382 + 0.0416 + 0.00156 + 0.00252 + 0.0027 =0.0648 QR、.二 0.0024 + 0.0005303+0.0056 + 0.0063 + 0.01848 + 0.0411 =0.0744 QR2=-0.06482 0.07442 =0.09862 Q(4) 短路电流计算Is3 二Uav3Z、:4039.5A3 0.09862Is2 二Uav6902

14、 0.09862-3498.3A地点变压器电缆三相短路电流/A两相短路电流/A清煤斜巷KBSGZY-500MY-3 X 50 60mMY-3 X 25150mMY-3 X 16 20m1905.51650.2回风巷刷扩KBSGZY-500MY-3 X 70 400mMY-3 X 25 200m1218.81055.51米皮带机KBSGZY-500MY-3 X 50 200mMY-3 X 2510m3013.72019.9绕道刷扩KBSGZY-500MY-3 X 50 220mMY-3 X 35150mMY-3 X 25100m1312.51136.7轨道巷刷扩KBSGZY-630MY-3 X

15、50 550mMY-3 X 25 50m1257.01088.6中部水仓KBSGZY-630MY-3 X 50 900mMY-3 X 25 20m886.5767.7中央水泵房KBSGZY-630MY-3 X 70 20mMY-3 X 35 30mMY-3 X 16 30m4039.53498.3矿用橡套电缆的单位长度电阻与电抗阻抗Zo( Q/km)截面（mm2）4610162535507095120电阻Ro5.53.6932.1591.3690.86380.61600.44840.31510.23010.18电抗Xo0.1010.0950.0920.0900.0880.0840.0810.0

16、780.0750.074矿用铠装电缆单位长度的有效电阻和电抗（Q /km）电缆主芯 线截面（mm）铜铝1KV及以下6KV1KV及以下6KVRXR）XR）XR）X045.3480.0959.0130.09563.5660.0906.0080.090102.1390.0733.6050.073161.3370.06571.340.0682.2530.06752.2570.068250.8560.06620.8570.0661.4410.06621.4450.066350.6100.06370.6120.0641.0300.06371.0300.064500.42830.06250.4290.063

17、0.7210.06250.7220.063700.30440.06120.3060.0610.51450.06120.5160.061950.22540.06020.2260.0600.380.06020.380.060裸绞线的电阻和电抗导线型号电阻/Q/km线间几何均距（m）0.60.81.01.251.502.002.503.003.504.00电抗(Q /km)LGJ-161.9260.3870.4010.4120.430.4440.4560.4660.474LGJ-251.2860.3740.3880.4000.4180.4320.4430.4530.461LGJ-350.7960.3

18、590.3730.3850.4030.4170.4290.4380.446LGJ-500.6090.3510.3650.3760.3940.4080.4200.4290.437LGJ-700.4320.3640.3820.3960.4080.4170.425LGJ-950.3150.3530.3710.3850.3970.4060.414LGJ-1200.2550.3470.3650.3790.3910.4000.408LGJ-1500.2110.3400.3580.3720.3840.3980.401LGJ-1850.1630.3650.3770.3860.394LGJ-2400.1300.

19、3570.3690.3780.386井下负荷整定计算一、供电系统简介：我矿设有两回进线，一回881线路来自宝丰35kV站(LGJ-240/30钢芯铝绞线，4.286km)、另一回584线路来贾寨35kV站(LGJ-185/25,钢芯铝绞线，5.086km),均为10kV输电线路；电源系统短路容量为50MVA。井下供电由井上变电所经两趟高压铠装电缆(MYJV42-3 X 70,MY JV22-3 X 70)入井供电，井下中央变电所安装两台变压器(KBSGZY-500 , KBSGZY-630)，分别由 3#、4#高开控制。二、矿井负荷统计：矿井负荷统计表工作面名称设备名称安装台数安装容量使用容量

20、设备需用系数功率因数最大电机功率计算负荷清煤斜巷给煤机2303015小水泵11111回风巷刷扩刮板机1404040喷浆机15.55.5小绞车111.411.41米皮带机1米皮带机115015075皮带张紧车144绕道刷扩刮板机1404055装岩机15858喷浆机15.55.5轨道巷刷扩刮板机312012040喷浆机15.55.5小绞车222.822.8小水泵11111中部水仓水泵2110550.850.8555中央水泵房主排水泵32951100.850.85110500变压器380.4380.475630变压器564.3324.3110三、馈电开关整定:1、清煤斜巷馈电整定。(1) 设备需用系

21、数：PS15kx 二 0.286 0.714 =0.286+0.714X 竺=0.547、Pn41(2) 负载电流：I =kx le =0.547 1.15 41=25.8A过载电流lz =1.2I =1.2 X 25.8=30.96A过载电流整定为30A短路电流：ldz =8Ie k le =8 1.15 15 0.547 1.15 (41 -15) = 154.4 A短路电流整定为160A(3) 灵敏度校验11650.2丨=dz=10.311.5160短路电流校验合格，短路整定值灵敏可靠2、回风巷刷扩馈电整定。(1) 设备需用系数：PS40kx = 0.286 0.714 S =0.286

22、+0.714 =0.788、 Pn56.9(2) 负载电流：I =kx le = 0.788 1.15 56.9=51.56A过载电流lZ =12 =1.2X 51.56=61.9A过载电流整定为60A短路电流：Idz =8le kx le =8 1.15 40 0.788 1.15 (56.9 - 40) =383.3 A短路电流整定为380A(3) 灵敏度校验kSdz1055.5380=2.781.5短路电流校验合格，短路整定值灵敏可靠3、1米皮带机馈电整定。(1) 设备需用系数：kx = 0.8(2) 负载电流：I 二kx le =0.8 1.15 154 = 141.68A过载电流IZ

23、 =12 =1.2X 141.68=170A过载电流整定为170A短路电流：Idz =8le kx le =8 1.15 150 0.8 1.15 (154-150)=1383.6 A短路电流整定为1300A(3) 灵敏度校验ksdz= 2019.9=1300=1.551.5短路电流校验合格，短路整定值灵敏可靠4、绕道刷扩馈电整定。(1) 设备需用系数：Ps55kx 二 0.286 0.714 s =0.286+0.714 =0.665、Pn103.5(2) 负载电流：I 二 kx le =0.665 1.15 103.5 = 79.2A 过载电流IZ =12 =1.2 X 79.2=95A过

24、载电流整定为100A短路电流：Idz =8le kle =8 1.15 55 0.665 1.15 (103.5-55)=543.1 A短路电流整定为540A(3) 灵敏度校验kS= 1136.7540=2.1051.5短路电流校验合格，短路整定值灵敏可靠5、轨道巷刷扩馈电整定。(1) 设备需用系数：kx =0.286 0.714 Ps =0.286+0.714=0.465 PN159.3(2) 负载电流:I 二 kxTe =0.465 1.15 159.3=85.2A过载电流IZ =1.2I =1.2X 85.2=102.3A过载电流整疋为100A短路电流:Idz =81 e kx le =

25、8 1.15 55 0.465 1.15 (159.3-40)= 431.8 A短路电流整定为430A1(2)1088=2.53 1.5430(3) 灵敏度校验ks短路电流校验合格，短路整定值灵敏可靠6、中部水仓馈电整定。(1) 设备需用系数：kx 二 0.85(2) 负载电流：I = kTe =0.85 1.15 55=53.76A过载电流IZ =1.21 =1.2 X 53.76=64.5A过载电流整定为65A短路电流：Idz =81 e kle =8 1.15 55 = 506 A短路电流整定为500A(3) 灵敏度校验, I (2)767.7,厂kS =1.531.5I dz 500短

26、路电流校验合格，短路整定值灵敏可靠7、中央水泵房馈电整定。(1) 设备需用系数：kx 二 0.85(2) 负载电流：I 二 kx le =0.85 1.15 110=107.5A过载电流lZ =12 =1.2X 107.5=129A过载电流整定为130A短路电流：Idz =8le kx le =8 1.15 110 =1012 A短路电流整定为1000A(3) 灵敏度校验ksl(2)dz= 3498.3=1000=3.51.5短路电流校验合格，短路整定值灵敏可靠馈电地点工作容量过载电流短路电流最小两相短 路电流灵敏 度清煤斜巷41301501650.210.31回风巷刷扩56.60380105

27、5.52.781米皮带15417013002019.91.55绕道刷扩103.5955401136.72.105轨道巷刷扩159.31004301088.62.53中部水仓5565500767.71.54中央水泵房11013010003498.33.5四、高压开关整定：1、4#高开整定：(1) 负荷统计：P, =30+11+40+5.5+11.4+150+4+25+40+58+5.5=380.4kW(2) 设备需用系数：p75kx = 0.286 0.714 S =0.286+0.714X=0.427、Pn380.4(3) 负载电流：I 二 kxTe=0.427 1.15 380.4 X 0.69/10