煤矿机电保护整定计算

××煤矿供电系统保护整定计算编审科制:核：长：二〇一〇年九月五日目录第一节短路计算······························································································2第二节动、热稳定性校验··············································································10第三节扇风机房整定计算··············································································15第四节压风机房整定计算··············································································15第五节主井绞车房整定计算··········································································15第六节副井绞车房整定计算··········································································16第七节中央变电所整定计算··········································································16第八节二采变电所整定计算··········································································18第九节900变电所整定计算···········································································21第十节机头变电所整定计算··········································································22第十一节南翼变电所整定计算······································································24××煤矿供电系统整定计算第一节短路计算一、计算依据1、唐口110kV变电所35kV母线短路电流：Id3max=5.689kAId3min=2.799kA2、兴福集35kV变电所35kV母线短路电流：Id3max=2.323kAId3min=1.496kA二、短路计算（一）我矿35kV变电所6kV侧母线短路电流计算1、××矿线时：（1）系统阻抗：最大运行方式：x0min=Ω7551.3689.53/37φmin)3(==dIE最小运行方式：x0min=Ω6323.7799.23/37φmin)3(==dIE（2）线路阻抗：查《煤矿电工手册》第二分册（下同）表2-2-11得：xl=224.027.0+Ω/km×17km=8..2042Ω（3）主变压器电抗：xTr=Ω7616.8Ω12500000370001008100%2--2=×=×TRNTRNKSUU（4）主变压器电抗：n=5556.53.635=（5）用xx矿线时我矿35KV变电所35KV母线侧短路电流：（6）I(3)dcmin=KAxxEo786.12042.87551.33/371min=+=+φ(3IdC)max=373Eϕ==1.786kAx0min+xl3.7551+8.2042373Eϕ==1.349kAx0max+xl7.6323+8.2042(3IdC)min=6kV母线侧短路电流：(3IdC)max=x0min5.5556×373nEϕ==5.7277kA+xl+xTr3.7551+8.2042+8.7616(3IdC)min=5.5556×373nEϕ==4.8249kAx0max+xl+xTr7.6323+8.2042+8.76162、兴王线时：（1）系统阻抗：最大运行方式：x0min=最小运行方式：x0min=（2）线路阻抗：查表2-2-11得：xl=0.272+0.42Ωkm×9.2km=4.4399ΩEϕI(3)dmax=373=9.19622.323373Eϕ==14.2799(3)1.496Idmin（3）主变压器电抗：xTr=2Uk%UN⋅Tr8370002⋅=×Ω=8.7616Ω100SN⋅Tr10012500000（4）主变压器变比：n=35=5.55566.33（5）用兴王线时我矿35kV变电所35kV母线侧短路电流：(3IdC)max=373Eϕ==1.5667kAx0min+xl9.1962+4.4399373Eϕ==1.1412kAx0max+xl14.2799+4.4399(3IdC)min=6kV母线侧用兴王线时短路电流：最大运行方式：(3IdC)max=x0minnEϕ5.5556×37/3==5.2989kA+xl+xTr9.1962+4.4399+8.7616最小运行方式：(3IdC)min=5.5556×373nEϕ==4.3187kAx0max+xl+xTr14.2799+4.4399+8.7616以上计算显示我矿6kV母线侧发生短路，兴王线路供电时短路电流较小，为满足供电安全性与可靠性，应以××矿线的最大运行方式下的短路电流与兴王线的最小运行方式下的短路电流配合为计算依据。则有我矿35kV变电所6kV母线侧短路电流为：(3最大运行方式：IdC)max=5.7277kA(3最小运行方式：IdC)min=4.3187kA35kV母线侧短路则有(3最大运行方式：IdC)max=1.786kA(3最小运行方式：IdC)min=1.1412kA（二）我矿6kV各支路短路电流计算以我矿35kV变电所6kV侧母线短路电流为依据，计算各支路末端短路电流：435kV变电所6kV侧母线短路阻抗：最大运行方式：x0min=最小运行方式：x0max=EϕI(3)dmax=63=0.6049Ω5.727763Eϕ==0.8022Ω(3)Idmin4.31871、中央变电所母线短路电流：至中央变电所电缆为MYJV426/6kV3×2401250米，阻抗查《煤矿电工手册》第二分册（下同）表2-2-13、14得：x1=0.082+0.082×1.25=0.1415Ω最大运行方式：(Id3)max=16.33Eϕ==4.8734kAx0min+x10.6049+0.1415最小运行方式：(Id3)min=16.33Eϕ==3.8545kAx0max+x10.8022+0.14152、压风机房母线侧短路电流：至压风机房电缆为YJV226/6kV3×35350米，阻抗为：x2=0.532+0.082×0.35=0.1876Ω最大运行方式：(Id32)max=6.33Eϕ==4.5899kAx0min+x20.6049+0.1876最小运行方式：(Id32)min=6.33Eϕ==3.675kAx0max+x20.8022+0.18763、副井绞车房短路电流：5（1）6kV母线侧短路电流：至副井绞车房电缆为：YJV226/6kV3×50270m，阻抗为：x3=0.372+0.082×0.27=0.1022Ω最大运行方式：(Id3)max=36.33Eϕ==5.1443kAx0min+x30.6049+0.1022最小运行方式：(Id3)min=36.33Eϕ==4.022kAx0max+x30.8022+0.1022（2）副井绞车房整流变压器二次侧短路电流折算至高压侧：（以大容量，小阻抗的1#整流变计算）xTr3=2Uk%UNTr35.563002⋅=×=1.7464Ω100SNTr31001250000最大运行方式：(Id3)max=31x0min6.33Eϕ==1.4826kA+x3+xTr30.6049+0.1022+1.7464最小运行方式：(Id3)min=31x0max6.33Eϕ==1.3723kA+x3+xTr30.8022+0.1022+1.74644、主井绞车房短路电流：（1）6kV母线侧短路电流：至副井绞车房电缆为：YJV226/6kV3×50300m，阻抗为：x3=0.372+0.082×0.3=0.1136Ω最大运行方式：6(Id34)max=6.33Eϕ==5.0627kAx0min+x40.6049+0.1136最小运行方式：(Id34)min=6.33Eϕ==3.972kAx0max+x40.8022+0.1136（2）主井绞车房整流变压器二次侧短路电流折算至高压侧：（以大容量，小阻抗的1#整流变计算）xTr42Uk%UNTr35.563002=⋅=×=1.7464Ω100SNTr31001250000最大运行方式：()Id341max=x0min6.33Eϕ==1.4758kA+x4+xTr40.6049+0.1136+1.7464最小运行方式：()Id341min=x0max6.33Eϕ==1.3664kA+x4+xTr40.8022+0.1136+1.74645、通风机房母线短路电流：至通风机房电缆为：YJV226/6kV3×35290m，阻抗为：x5=0.532+0.082×0.29=0.1555Ω最大运行方式：(Id3)max=56.33Eϕ==4.7837kAx0min+x50.6049+0.1555最小运行方式：(Id3)min=56.33Eϕ==3.7982kAx0max+x50.8022+0.15556、锅炉房变电所母线短路电流：至锅炉房变电所电缆为：YJV226/6kV3×35430m，阻抗为：7x6=0.532+0.082×0.43=0.2305Ω最大运行方式：(Id3)max=66.33Eϕ==4.3542kAx0min+x60.6049+0.2305最小运行方式：(Id3)min=66.33Eϕ==3.5224kAx0max+x60.8022+0.23057、洗煤厂母线短路电流：至洗煤厂电缆为：YJV226/6kV3×50680m，阻抗为：x7=0.372+0.082×0.68=0.2575Ω最大运行方式：(Id3)max=76.33Eϕ==4.2179kAx0min+x70.6049+0.2575最小运行方式：(Id3)min=76.33Eϕ==3.4326kAx0max+x70.8022+0.25758、综采设备库母线短路电流：至综采设备库电缆为：YJV226/6kV3×35460m，阻抗为：x8=0.532+0.082×0.46=0.2466Ω最大运行方式：(Id3)max=86.33Eϕ==4.2719kAx0min+x80.6049+0.2466最小运行方式：(Id3)min=86.33Eϕ==3.4683kAx0max+x80.8022+0.246689、中央变电所各支路末端短路电流计算：（1）至二采区变电所电缆为：MYJV226/6kV3×951210m，阻抗为：x11=0.192+0.082×1.21=0.2495Ω最大运行方式：(Id3)max=11x0min6.33Eϕ==3.6525kA+x1+x110.6049+0.1415+0.2495最小运行方式：(Id3)min=11x0max6.33Eϕ==3.4683kA+x1+x110.8022+0.1415+0.2495（2）机头硐室变电所：至机头硐室变电所电缆为MYJV226/6kV3×35500m，阻抗为：x12=0.532+0.082×0.5=0.268Ω最大运行方式：(Id3)max=12x0min6.33Eϕ==3.5859kA+x1+x120.6049+0.1415+0.268最小运行方式：(Id3)min=12x0max6.33Eϕ==3.002kA+x1+x120.8022+0.14