工作面短路整定计算说明书

1、12204工作面短路整定说明书12204综采工作面的装机总功率为3674KW。3300V系统最大负荷为采煤机，功率为925KW，1140V系统最大负荷为皮带机，总功率为400KW。信号及照明系统的电源均使用综合保护装置进行供电。负荷统计见下表序号设备名称电动机型号台数功率(KW)电压V电流A备注1煤机YBCS4-40024003300120A*2截割电机YBC-55E125538092A牵引电机17.538012A油泵电机2刮板运输机YBSD-400/200-4/8G24003300120A*23转载机YBSD-315/160-4/8Y1315330094.5A4破碎机YBSS-200Y120

2、0330060A5乳化泵YBK2-355M2-422501140220A6喷雾泵YBK2-225M-4245114039A7回柱绞车222114015.4A8顺槽皮带机YBKZ-355S2-422001140140A*29回柱绞车118.5114013A10输送机大巷皮带YBKZ-355S2-422001140140A*211回柱绞车118.5114013A12水泵7.56608A13水泵2266024A总功率23733KW三、变压器的选择(1)基本计算公式 Sb=KxPecos式中：Sb-变压器的计算容量，KVA; Kx-需用系数； Pe-所有设备的额定功率之和，KW; COS一加权平均功率

3、因数。(2)变压器容量的确定根据变压器容量基本计算公式和工作面负荷统计以及变电所的负荷情况，确定工作面共使用2台移动变电站，1台型号为KBSGZY-2500/10/3.3。1台为KBSGZY-1250/10/1.2，胶带机输送大巷使用一台KBSGZY-2000/10/1.2和一台KBSGZY-500/10/0.66。能够满足工作面和运输的使用要求。设备名称型号设备台数设备容量额定电压移动变电站KBSGZY-2500/10/3.31250010000/3300移动变电站KBSGZY-1250/10/1.21125010000/1140移动变电站KBSGZY-2500/10/1.212000100

4、00/1140移动变电站KBSGZY-500/10/0.69150010000/660四、短路电流的计算及各开关的整定校验短路电流计算根据煤矿井下低压电网短路保护装置的整定细则执行，先将电缆截面一律换算成50mm2，得到相应的电缆折算长度，再利用电缆折算长度，查煤矿井下低压电网短路保护装置的整定细则中相应变压器的短路电流表，得到各短路点的两相短路电流。所有开关按照供电线路短路保护的整定方法进行整定和校验，计算公式：1、短路电流按照公式（1）计算Id(2)= Ue (1) 2、1200V级以下馈电开关过电流整定值按照公式（2）计算Iz=IQe+Ie (2)按照Id(2)/IZ1.5校核3、 电磁

5、起动器过流整定值按照IZIe并按照Id(2)/8IZ1.2校核4、 变压器一次侧电流整定按照公式（3）计算IZ1.21.4(IQe+kxIe)/kb (3)5、 照明信号综保按照公式（4）计算整定IR=1.21.4Ie/Kb一）各短路点短路电流计算1、1#变压器二次出口端的短路电流Id1计算/变压器二次电压3300v、容量2500KVA、系统短路容量按100MVA计算。系统电抗Xx=33002/100*106=0.1089电缆Lg=1km R0=0.217/km X0=0.069/km高压电缆电阻、电抗 Rg=0.217*1=0.217 Xg=0.069*1=0.069变压器电阻、电抗Rb1=

6、0.016113 Xb1=0.264236R=0.217/3.032+0.016113=0.039422 X=0.1089+0.069/3.032+0.264236=0.380652Id1(2)= Ue =4311.6A 2、运输机尾处短路电流ID2计算(高速)MCPT3*70电缆的电阻、电抗：Lg=400m R0=0.315 X0=0.078XR1=0.078*0.4=0.0312 RR1=0.315*0.4=0.126R=0.039422+0.126=0.165422X=0.380652+0.0312=0.411852Id2(2)= Ue =3717.63A 3、运输机尾处短路电流ID2计

7、算(低速)MCPT3*50电缆的电阻、电抗：Lg=400m R0=0.32 X0=0.081XR1=0.081*0.4=0.0324 RR1=0.32*0.4=0.128R=0.039422+0.128=0.167422X=0.380652+0.0324=0.413052Id3(2)= Ue =3702.1A 4、运输机头处短路电流ID2计算(高速)MCPT3*70电缆的电阻、电抗：Lg=200m R0=0.315 X0=0.078XR1=0.078*0.2=0.0156 RR1=0.315*0.2=0.063R=0.039422+0.063=0.102422X=0.380652+0.0156

8、=0.411852Id/4 (2)= Ue =4031.52A 5、运输机头处短路电流ID2计算(低速)MCPT3*50电缆的电阻、电抗：Lg=200m R0=0.32 X0=0.081XR1=0.081*0.2=0.0162 RR1=0.32*0.2=0.064R=0.039422+0.064=0.101422X=0.380652+0.0162=0.396852Id5(2)= Ue =4028.25A 6、采煤机处短路电流ID6计算MCPT3*70电缆的电阻、电抗：Lg=400m R0=0.315 X0=0.078XR1=0.078*0.4=0.0312 RR1=0.315*0.4=0.12

9、6R=0.039422+0.126=0.165422X=0.380652+0.0312=0.396852Id6(2)= Ue =3717.63A 7、转载机处短路电流I/7计算(高速)MCPT3*70电缆的电阻、电抗：Lg=150m R0=0.315 X0=0.078XR1=0.078*0.15=0.0117 RR1=0.315*0.15=0.04725R=0.039422+0.04725=0.086672X=0.380652+0.0117=0.392352Id7(2)= Ue =4106.4A 8、转载机处短路电流ID/8计算(低速)MCPT3*50电缆的电阻、电抗：Lg=150m R0=0

10、.32 X0=0.081XR1=0.081*0.15=0.01215 RR1=0.32*0.15=0.048R=0.039422+0.048=0.087422X=0.380652+0.01215=0.392772Id8(2)= Ue =4100.57A 9、破碎机处短路电流ID9计算MCPT3*50电缆的电阻、电抗：Lg=180m R0=0.32 X0=0.081XR1=0.081*0.18=0.01458 RR1=0.32*0.18=0.0576R=0.039422+0.0576=0.097022X=0.380652+0.01458=0.395202Id9(2)= Ue =4054.68A

11、10、2#变压器二次出口端的短路电流Id10计算/变压器二次电压1200v、容量2000KVA、系统短路容量按100MVA计算。系统电抗Xx=12002/100*106=0.0144电缆Lg=0.6km R0=0.217/km X0=0.069/km高压电缆电阻、电抗 Rg=0.217*0.6=0.1302 Xg=0.069*0.6=0.0414变压器电阻、电抗Rb1=0.016113 Xb1=0.264236R=0.1302/8.332+0.016113=0.017989 X=0.0144+0.0414/8.332+0.264236=0.279233Id10(2)= Ue =2144.3A

12、11、1#乳化泵处短路电流ID11计算MYP3*50电缆的电阻、电抗：Lg=15m R0=0.32 X0=0.081XR1=0.081*0.015=0.001215 RR1=0.32*0.015=0.0048R=0.017989+0.0048=0.022789X=0.279233+0.001215=0.280448Id11(2)= Ue =2132.4A 12、2#乳化泵处短路电流ID12计算MYP3*50电缆的电阻、电抗：Lg=25m R0=0.32 X0=0.081XR1=0.081*0.025=0.002025 RR1=0.32*0.025=0.008R=0.017989+0.008=0

13、.025989X=0.279233+0.002025=0.281258Id12(2)= Ue =2124.22A 13、1#喷雾泵处短路电流ID13计算MYP3*16电缆的电阻、电抗：Lg=30m R0=1.4 X0=0.09XR1=0.09*0.03=0.0027 RR1=1.4*0.03=0.042R=0.017989+0.042=0.059989X=0.279233+0.0027=0.281933Id13(2)= Ue =2081.57A 14、2#喷雾泵处短路电流ID14计算MYP3*16电缆的电阻、电抗：Lg=40m R0=1.4 X0=0.09XR1=0.09*0.04=0.003

14、6 RR1=1.4*0.04=0.056R=0.017989+0.056=0.073989X=0.279233+0.0036=0.282833Id14(2)= Ue =2052.33A 15、绞车处短路电流ID15计算MYP3*16电缆的电阻、电抗：Lg=30m R0=1.4 X0=0.09XR1=0.09*0.03=0.0027 RR1=1.4*0.03=0.042R=0.017989+0.042=0.059989X=0.279233+0.0027=0.281933Id15(2)= Ue =2081.57A 16、顺槽皮带机处短路电流ID16计算MYP3*50电缆的电阻、电抗：Lg=25m

15、R0=0.32 X0=0.081XR1=0.081*0.025=0.002025 RR1=0.32*0.025=0.008R=0.017989+0.008=0.025989X=0.279233+0.002025=0.281258Id16(2)= Ue =2124.22A 17、3#变压器二次出口端的短路电流Id17计算/变压器二次电压690v、容量500KVA、系统短路容量按100MVA计算。系统电抗Xx=6902/100*106=0.004761电缆Lg=0.6km R0=0.217/km X0=0.069/km高压电缆电阻、电抗 Rg=0.217*0.6=0.1302 Xg=0.069*0

16、.6=0.0414变压器电阻、电抗Rb1=0.004913 Xb1=0.036945R=0.1302/14.492+0.004913=0.005533 X=0.004761+0.0414/14.492+0.036945=0.041903Id17(2)= Ue =8162.45A 18、4#变压器二次出口端的短路电流Id18计算/变压器二次电压1200v、容量2000KVA、系统短路容量按100MVA计算。系统电抗Xx=12002/100*106=0.0144电缆Lg=0.05m R0=0.217/km X0=0.069/km高压电缆电阻、电抗 Rg=0.217*0.05=0.01085 Xg=

17、0.069*0.05=0.00345变压器电阻、电抗Rb1=0.004866 Xb1=0.049766R=0.01085/8.332+0.004866=0.005022 X=0.0144+0.00345/8.332+0.049766=0.006422Id18(2)= Ue =7360A 19、转载皮带机处短路电流ID19计算MYP3*50电缆的电阻、电抗：Lg=25m R0=0.32 X0=0.081XR1=0.081*0.025=0.002025 RR1=0.32*0.025=0.008R=0.017989+0.008=0.025989X=0.279233+0.002025=0.281258

18、Id19(2)= Ue =2124.22A 二）开关整定值计算1、1#4组合开关3300V1）采煤机Ie=Pe/1.732Uecos=2*400/1.732*3.3*0.85=164.66180AIZ1=8Ie=1440 I(2)d/IZ1=3717/1440=2.581.52)转载机高速Ie= Pe/1.732Uecos=315/1.732*3.3*0.8565AIZ2=8Ie=520 Id(2)/IZ=4106/520=7.81.53) 转载机低速Ie= Pe/1.732Uecos=160/1.732*3.3*0.8533AIZ2=8Ie=264 Id(2)/IZ=4100/264=15.

19、51.52、2#6组合开关3300V1）运输机头高速 Ie= Pe/1.732Uecos=400/1.732*3.3*0.8583AIZ2=8Ie=664 Id(2)/IZ=3717/664=5.51.52) 运输机头低速 Ie= Pe/1.732Uecos=200/1.732*3.3*0.8542AIZ2=8Ie=336 Id(2)/IZ=4028/336=11.91.53）运输机尾高速 Ie= Pe/1.732Uecos=400/1.732*3.3*0.8583AIZ2=8Ie=664 Id(2)/IZ=4031/664=6.071.54）运输机尾低速 Ie= Pe/1.732Uecos=200/1.732*3.3*0.8542AIZ2=8Ie=336 Id(2)/IZ=3702/336=11.011.55）破碎机 Ie= Pe/1.732Uecos=200/1.732*3.3*0.8542AIZ2=8Ie=336 Id(2)/IZ=