短路电流计算及电缆校核公式

一、xxxxxxx电站短路电流计算[110kV上网 方案 气瓶 现场处置方案 .pdf气瓶 现场处置方案 .doc见习基地管理方案.doc关于群访事件的化解方案建筑工地扬尘治理专项方案下载 Ⅰ](Sj=100MVA，Uj=UpkV；单位MW、MVA、km)现在是4/25/1615:571、基本参数X0=0.400X0=0.400X0=0.400L=0.00L=0.00L=18.00XL=0.000XL=0.000XL=0.054Sb=0.00Sb=12.500Sb=0.000X0=0.400Sb=8.00Ud=7.000Ud=8.000Ud=7.500L=0.00Ud=7.500Xb=---Xb=0.640Xb=---XL=0.000Xb=0.938系统电抗标幺值Xx＝0.050已知与该系统连接的Sf=0.00Sf=10.000Sf=0.000Sf=0.00断路器的断流容量Sdn＝2000.0X"d=0.200X"d=0.183X"d=0.183X"d=0.200Xf=---Xf=1.464Xf=---Xf=---S＝∞2、阻抗变换0.0000.0000.0540.000---0.640---0.9380.050---1.464---------S1---S4Sx0.0000.640---1.464------0.104---S1---S4Sx0.640---1.464------0.104---S1---S4Sx0.640---1.464---0.104---S1S4Sx0.6401.464---0.104S1S4Sxd1点短路时d2点短路时1.46410000000000.0000.7442.10410000000000.0000.104S1S4SxS1S4Sx3、短路电流计算成果短路电流计算成果表短路点平均电压Up电源计算数据短路电流计算数据短路电流热效应Qzt(KA2*t)电源名称额定容量Se直连电抗X计算电抗Xjs（查表）电源额定电流Iet=0st=0.2st=4s冲击系数Kch冲击短路电流ich短路全电流最大有效值Ich标幺值I*"　　(查表)有名值I"短路容量S"标幺值I*0.2有名值I0.2短路容量S0.2标幺值I*4有名值I4短路容量S40.2s2.5skVMWKAKAMVAKAMVAKAMVAKAKA周期分量非周期分量∑周期分量非周期分量∑①②③④⑤⑥⑦⑧⑨⑩⑾⑿⒀⒁⒂⒃⒄⒅⒆d-16.3110kV系统Sx∝0.7449.1641.34312.310134.312.310134.312.310134.31.9033.0819.93发电机F110.001.4640.1831.1466.1277.01976.64.1004.69751.23.0813.52938.518.8611.36发电机F23450.0010000000000.000.0000.0006.1270.0000.04.1000.0000.03.0810.0000.00.000.00∑19.329210.917.007185.615.840172.851.9431.2966.2874.72141.01774.2974.72849.01d-2115110kV系统Sx∝0.1040.5029.5754.807957.44.807957.44.807957.41.8512.587.52发电机F110.002.1040.2630.0634.2900.26953.63.2530.20440.73.0980.19438.70.700.42发电机F23450.0010000000000.0000.0000.0006.1270.0000.04.1000.0000.03.0810.0000.00.000.00∑5.0761011.15.011998.15.001996.213.287.945.092.837.9263.472.8366.31注释发电机电抗标么值：Xf=X"d%/100*Sj/Sf有名值计算：I"=Ie*I"*小插件Y-Δ变换计算变压器电抗标么值：Xb=Ud%/100*Sj/Sb短路容量：S"=1.732*Up*I"X31=7.612X1=0.175线　路电抗标么值：XL=X0*L*Sj/Up^2X21=1.592X2=1.380计算电抗(从基准容量Sj换算到额定容量Se的标么值)：⑥Xjs＝X(f、b、L)*Se/SjX32=60.03X3=6.600额定电流：⑦Ie=Se/(1.732*Up)系统Se=SjX1=0.175X31=7.612⑧I"*计算：电源无限大时或以电源为基准的计算电抗标幺值Xjs≥3时，为⑤的倒数；否则查水轮机运算曲线或运算表。X2=1.380X21=1.592X3=6.600X32=60.03开关设备校验：额定断流容量>S"；极限通过电流峰值>Ich；额定开断电流>I"；允热稳定电流^2×允许通过时间t>I"20.2×0.2；额定关合电流>ich以下是查算发电机短路电流曲线表的中间过程－－－可不必查看！！！d-1短路时F1回路I*t计算I*0S=6.127I*0.2S=4.1I*4S=3.0810.183xjs<0.35I*t=0s6.1270.35<=xjs<0.53I*t=0s3.0950.53<=xjs<0.925I*t=0s2.0130.925<=xjs<1.375I*t=0s1.1181.375<=xjs<1.825I*t=0s0.7511.825<=xjs<2.275I*t=0s0.5652.275<=xjs<2.725I*t=0s0.4532.725<=xjs<3.155I*t=0s0.378I*t=0.2s4.1I*t=0.2s2.574I*t=0.2s1.826I*t=0.2s1.099I*t=0.2s0.766I*t=0.2s0.582I*t=0.2s0.462I*t=0.2s0.38I*t=4s3.081I*t=4s2.837I*t=4s2.396I*t=4s1.308I*t=4s0.813I*t=4s0.59I*t=4s0.462I*t=4s0.38Xjs0.180.200.220.240.260.280.300.320.340.360.380.400.420.440.460.480.500.520.540.560.600.650.700.750.800.850.900.951.001.051.101.151.201.251.301.351.401.451.501.551.601.651.701.751.801.851.901.952.002.052.102.152.202.252.302.352.402.452.502.552.602.652.702.752.802.852.902.953.003.053.103.15t=06.1275.5265.0554.6474.2903.9933.7273.4943.2853.0952.9222.7672.6272.5002.3852.2802.1832.0952.0131.9381.8021.6581.5341.4281.3361.2541.1821.1181.0611.0090.9620.9190.8800.8430.8100.7800.7510.7250.7000.6770.6550.6350.6160.5980.5810.5650.5500.5360.5220.5090.4970.4850.4740.4630.4530.4430.4340.4250.4160.4080.4000.3920.3850.3780.3710.3640.3580.3510.3450.3390.3340.328t=0.24.1003.8563.6333.4333.2533.0962.9502.8172.6922.5742.4642.3612.2672.1792.0982.0231.9531.8871.8261.7961.6651.5501.4511.3631.2861.2171.1551.0991.0481.0020.9590.9200.8850.8520.8210.7920.7660.7400.7170.6940.6730.6530.6340.6160.5990.5820.5660.5510.5370.5230.5100.4970.4850.4730.4620.4520.4410.4310.4220.4130.4040.3960.3880.3800.3730.3660.3590.3530.3460.3400.3340.329t=43.0813.2343.1913.1513.0983.0432.9932.9432.8912.8372.7822.7282.6752.6242.5752.5272.4822.4382.3962.3552.2632.1371.9641.7941.6421.5311.4031.3081.2251.1521.0871.0290.9770.9300.8880.8490.8130.7800.7500.7220.6960.6720.6490.6280.6090.5900.5720.5560.5400.5250.5120.4980.4860.4740.4620.4520.4410.4310.4220.4130.4040.3960.3880.3800.3730.3660.3590.3530.3460.3400.3340.329d-1短路时F234回路I*t计算I*0S=6.127I*0.2S=4.1I*4S=3.0810.000xjs<0.35I*t=0s6.1270.35<=xjs<0.53I*t=0s3.0950.53<=xjs<0.925I*t=0s2.0130.925<=xjs<1.375I*t=0s1.1181.375<=xjs<1.825I*t=0s0.7511.825<=xjs<2.275I*t=0s0.5652.275<=xjs<2.725I*t=0s0.4532.725<=xjs<3.155I*t=0s0.378I*t=0.2s4.1I*t=0.2s2.574I*t=0.2s1.826I*t=0.2s1.099I*t=0.2s0.766I*t=0.2s0.582I*t=0.2s0.462I*t=0.2s0.38I*t=4s3.081I*t=4s2.837I*t=4s2.396I*t=4s1.308I*t=4s0.813I*t=4s0.59I*t=4s0.462I*t=4s0.38Xjs0.180.200.220.240.260.280.300.320.340.360.380.400.420.440.460.480.500.520.540.560.600.650.700.750.800.850.900.951.001.051.101.151.201.251.301.351.401.451.501.551.601.651.701.751.801.851.901.952.002.052.102.152.202.252.302.352.402.452.502.552.602.652.702.752.802.852.902.953.003.053.103.15t=06.1275.5265.0554.6474.2903.9933.7273.4943.2853.0952.9222.7672.6272.5002.3852.2802.1832.0952.0131.9381.8021.6581.5341.4281.3361.2541.1821.1181.0611.0090.9620.9190.8800.8430.8100.7800.7510.7250.7000.6770.6550.6350.6160.5980.5810.5650.5500.5360.5220.5090.4970.4850.4740.4630.4530.4430.4340.4250.4160.4080.4000.3920.3850.3780.3710.3640.3580.3510.3450.3390.3340.328t=0.24.1003.8563.6333.4333.2533.0962.9502.8172.6922.5742.4642.3612.2672.1792.0982.0231.9531.8871.8261.7961.6651.5501.4511.3631.2861.2171.1551.0991.0481.0020.9590.9200.8850.8520.8210.7920.7660.7400.7170.6940.6730.6530.6340.6160.5990.5820.5660.5510.5370.5230.5100.4970.4850.4730.4620.4520.4410.4310.4220.4130.4040.3960.3880.3800.3730.3660.3590.3530.3460.3400.3340.329t=43.0813.2343.1913.1513.0983.0432.9932.9432.8912.8372.7822.7282.6752.6242.5752.5272.4822.4382.3962.3552.2632.1371.9641.7941.6421.5311.4031.3081.2251.1521.0871.0290.9770.9300.8880.8490.8130.7800.7500.7220.6960.6720.6490.6280.6090.5900.5720.5560.5400.5250.5120.4980.4860.4740.4620.4520.4410.4310.4220.4130.4040.3960.3880.3800.3730.3660.3590.3530.3460.3400.3340.329d-2短路时F1回路I*t计算I*0S=4.29I*0.2S=3.253I*4S=3.0980.263xjs<0.35I*t=0s4.290.35<=xjs<0.53I*t=0s3.0950.53<=xjs<0.925I*t=0s2.0130.925<=xjs<1.375I*t=0s1.1181.375<=xjs<1.825I*t=0s0.7511.825<=xjs<2.275I*t=0s0.5652.275<=xjs<2.725I*t=0s0.4532.725<=xjs<3.155I*t=0s0.378I*t=0.2s3.253I*t=0.2s2.574I*t=0.2s1.826I*t=0.2s1.099I*t=0.2s0.766I*t=0.2s0.582I*t=0.2s0.462I*t=0.2s0.38I*t=4s3.098I*t=4s2.837I*t=4s2.396I*t=4s1.308I*t=4s0.813I*t=4s0.59I*t=4s0.462I*t=4s0.38Xjs0.180.200.220.240.260.280.300.320.340.360.380.400.420.440.460.480.500.520.540.560.600.650.700.750.800.850.900.951.001.051.101.151.201.251.301.351.401.451.501.551.601.651.701.751.801.851.901.952.002.052.102.152.202.252.302.352.402.452.502.552.602.652.702.752.802.852.902.953.003.053.103.15t=06.1275.5265.0554.6474.2903.9933.7273.4943.2853.0952.9222.7672.6272.5002.3852.2802.1832.0952.0131.9381.8021.6581.5341.4281.3361.2541.1821.1181.0611.0090.9620.9190.8800.8430.8100.7800.7510.7250.7000.6770.6550.6350.6160.5980.5810.5650.5500.5360.5220.5090.4970.4850.4740.4630.4530.4430.4340.4250.4160.4080.4000.3920.3850.3780.3710.3640.3580.3510.3450.3390.3340.328t=0.24.1003.8563.6333.4333.2533.0962.9502.8172.6922.5742.4642.3612.2672.1792.0982.0231.9531.8871.8261.7961.6651.5501.4511.3631.2861.2171.1551.0991.0481.0020.9590.9200.8850.8520.8210.7920.7660.7400.7170.6940.6730.6530.6340.6160.5990.5820.5660.5510.5370.5230.5100.4970.4850.4730.4620.4520.4410.4310.4220.4130.4040.3960.3880.3800.3730.3660.3590.3530.3460.3400.3340.329t=43.0813.2343.1913.1513.0983.0432.9932.9432.8912.8372.7822.7282.6752.6242.5752.5272.4822.4382.3962.3552.2632.1371.9641.7941.6421.5311.4031.3081.2251.1521.0871.0290.9770.9300.8880.8490.8130.7800.7500.7220.6960.6720.6490.6280.6090.5900.5720.5560.5400.5250.5120.4980.4860.4740.4620.4520.4410.4310.4220.4130.4040.3960.3880.3800.3730.3660.3590.3530.3460.3400.3340.329d-2短路时F234回路I*t计算I*0S=6.127I*0.2S=4.1I*4S=3.0810.000xjs<0.35I*t=0s6.1270.35<=xjs<0.53I*t=0s3.0950.53<=xjs<0.925I*t=0s2.0130.925<=xjs<1.375I*t=0s1.1181.375<=xjs<1.825I*t=0s0.7511.825<=xjs<2.275I*t=0s0.5652.275<=xjs<2.725I*t=0s0.4532.725<=xjs<3.155I*t=0s0.378I*t=0.2s4.1I*t=0.2s2.574I*t=0.2s1.826I*t=0.2s1.099I*t=0.2s0.766I*t=0.2s0.582I*t=0.2s0.462I*t=0.2s0.38I*t=4s3.081I*t=4s2.837I*t=4s2.396I*t=4s1.308I*t=4s0.813I*t=4s0.59I*t=4s0.462I*t=4s0.38Xjs0.180.200.220.240.260.280.300.320.340.360.380.400.420.440.460.480.500.520.540.560.600.650.700.750.800.850.900.951.001.051.101.151.201.251.301.351.401.451.501.551.601.651.701.751.801.851.901.952.002.052.102.152.202.252.302.352.402.452.502.552.602.652.702.752.802.852.902.953.003.053.103.15t=06.1275.5265.0554.6474.2903.9933.7273.4943.2853.0952.9222.7672.6272.5002.3852.2802.1832.0952.0131.9381.8021.6581.5341.4281.3361.2541.1821.1181.0611.0090.9620.9190.8800.8430.8100.7800.7510.7250.7000.6770.6550.6350.6160.5980.5810.5650.5500.5360.5220.5090.4970.4850.4740.4630.4530.4430.4340.4250.4160.4080.4000.3920.3850.3780.3710.3640.3580.3510.3450.3390.3340.328t=0.24.1003.8563.6333.4333.2533.0962.9502.8172.6922.5742.4642.3612.2672.1792.0982.0231.9531.8871.8261.7961.6651.5501.4511.3631.2861.2171.1551.0991.0481.0020.9590.9200.8850.8520.8210.7920.7660.7400.7170.6940.6730.6530.6340.6160.5990.5820.5660.5510.5370.5230.5100.4970.4850.4730.4620.4520.4410.4310.4220.4130.4040.3960.3880.3800.3730.3660.3590.3530.3460.3400.3340.329t=43.0813.2343.1913.1513.0983.0432.9932.9432.8912.8372.7822.7282.6752.6242.5752.5272.4822.4382.3962.3552.2632.1371.9641.7941.6421.5311.4031.3081.2251.1521.0871.0290.9770.9300.8880.8490.8130.7800.7500.7220.6960.6720.6490.6280.6090.5900.5720.5560.5400.5250.5120.4980.4860.4740.4620.4520.4410.4310.4220.4130.4040.3960.3880.3800.3730.3660.3590.3530.3460.3400.3340.329水轮发电机短路电流（I*t）运算曲线Xjs0.180.200.220.240.260.280.300.320.340.360.380.400.420.440.460.480.500.52t=06.1275.5265.0554.6474.2903.9933.7273.4943.2853.0952.9222.7672.6272.5002.3852.2802.1832.095t=0.24.1003.8563.6333.4333.2533.0962.9502.8172.6922.5742.4642.3612.2672.1792.0982.0231.9531.887t=43.0813.2343.1913.1513.0983.0432.9932.9432.8912.8372.7822.7282.6752.6242.5752.5272.4822.438Xjs0.540.560.600.650.700.750.800.850.900.951.001.051.101.151.201.251.301.35t=02.0131.9381.8021.6581.5341.4281.3361.2541.1821.1181.0611.0090.9620.9190.8800.8430.8100.780t=0.21.8261.7961.6651.5501.4511.3631.2861.2171.1551.0991.0481.0020.9590.9200.8850.8520.8210.792t=42.3962.3552.2632.1371.9641.7941.6421.5311.4031.3081.2251.1521.0871.0290.9770.9300.8880.849Xjs1.401.451.501.551.601.651.701.751.801.851.901.952.002.052.102.152.202.25t=00.7510.7250.7000.6770.6550.6350.6160.5980.5810.5650.5500.5360.5220.5090.4970.4850.4740.463t=0.20.7660.7400.7170.6940.6730.6530.6340.6160.5990.5820.5660.5510.5370.5230.5100.4970.4850.473t=40.8130.7800.7500.7220.6960.6720.6490.6280.6090.5900.5720.5560.5400.5250.5120.4980.4860.474Xjs2.302.352.402.452.502.552.602.652.702.752.802.852.902.953.003.053.103.15t=00.4530.4430.4340.4250.4160.4080.4000.3920.3850.3780.3710.3640.3580.3510.3450.3390.3340.328t=0.20.4620.4520.4410.4310.4220.4130.4040.3960.3880.3800.3730.3660.3590.3530.3460.3400.3340.329t=40.4620.4520.4410.4310.4220.4130.4040.3960.3880.3800.3730.3660.3590.3530.3460.3400.3340.3296-35kV电力电缆选择pass"."交联聚乙希绝缘聚氯乙希护套3芯电力电缆允许载流量Ixu（A）[缆芯最高温度90度]　　一、电压选择缆芯截面mm2空气中敷设（环境温度40度）直埋敷设，土壤热阻系数2度.m/W（环境温度25度）1-3kV6kV10kV20-35kV1-3kV6kV10kV20-35kV回路最高工作电压Ugmax＝6.30kV无钢铠有钢铠无钢铠有钢铠环境温度25度无钢铠有钢铠无钢铠有钢铠环境温度25度电力电缆额定电压Un＝6.00kV2591**10010085918787909090Ugmax<=1.15Un满足要求35114114*12312311011310510211010511550146141*146141135134123118125120135　　二、截面选择70178173*17817316516514814815215216595214209*2192141801951781781821821852、按工作电流选择120246246*251246200221200200205205210150278277*283278230247232222223219230回路额定功率Pn＝1600kW185319323*324320*278262252252247250回路额定工作电压Un＝6.30kV240378378*378373*321300295292292*回路持续工作电流Ig＝192A300419432*433428*365343333332328*选用交联聚乙希绝缘YJLV-3×70mm2400*505*506501**380370378374*聚氯乙希护套电缆500*584*579574**432422428424*允许载流量Ixu＝173(铜芯则*1.29)表中系铝芯电缆数值，铜芯电缆可乘以1.29系数不同环境温度时校正系数Khj＝1.00参见《电力 工程 路基工程安全技术交底工程项目施工成本控制工程量增项单年度零星工程技术标正投影法基本原理 电缆 设计 领导形象设计圆作业设计ao工艺污水处理厂设计附属工程施工组织设计清扫机器人结构设计 规范 编程规范下载gsp规范下载钢格栅规范下载警徽规范下载建设厅规范下载 》GB50217-94；《水-机电- 手册 华为质量管理手册 下载焊接手册下载团建手册下载团建手册下载ld手册下载 》电一P318空气中多根并行敷设时K1＝0.90在空气中或穿管敷设时K2＝0.8535kV及以下电缆在不同环境温度时的载流量校正系数Khj空气中多根并行敷设时的载流量　　校正系数K1Khj*K1*K2*Ixu＝1325000小时，长度>20m时，则按经济电流密度选择701.151.081.000.911.051.000.940.88801.111.061.000.931.041.000.950.90芯线截面mm2<95120-185所选截面S=70小于86mm2不合要求901.091.051.000.941.041.000.960.92K20.900.85（Tmax=3000-5000小时，j铜=2.25，j铝=1.73）交联聚乙希绝缘聚氯乙希护套电力电缆　电压损失系数Ku　％/A*km4、按电压损失校验截面截面mm23*163*253*353*503*703*953*1203*1503*1853*2400.4kV铜芯、cosφ=0.8、θ=60度0.4860.3110.2220.1560.1110.1010.0830.0720.0620.053电压损失系数Ku=0.006％/A*km6kV铜芯、cosφ=0.8、θ=80度0.0350.0230.0170.0120.0090.0070.0060.0050.0040.004电缆长度L=30m10kV铜芯、cosφ=0.8、θ=80度0.0210.0140.0100.0070.0060.0040.0040.0030.0030.002电压损失Δu％=0.03％<5.0%参见《小型水电站机电设计手册》电一P279；《水电站机电设计手册》电一P315满足要求5、按热稳定校验截面为了保证电缆末端发生短路时，电缆芯线温度不超过允许值，电缆允许热效应θt应不小于线路计算的短路电流热效应θdt值（对于长度<200m的高压电缆可按短路发生在首端计算）。计算短路电流可按三相短路计算，并考虑系统5-10年的发展。电缆的允许热效应Qt＝(CS)2＝65kA2*s小于92不合要求（短路电流热效应，见短路电流计算表）热稳定系数C＝（1/η）*{JQ/（kj*ρ20*α）ln[(1+α（θd-20）)/(1+α（θg-20）)]}0.5*10-2　＝115.035kV及以下电缆芯在短路前的实际运行最高温度θg＝θ0＋(θc－θ0)(Ig/Ixu)2　＝102度芯线温度变化及绝缘影响系数η＝0.93（3-6kV取0.93；35kV以上取1.0）缆芯单位体积热容量Q＝0.81cal/cm3*度（铝芯取0.59；铜芯取0.81）热当量系数J＝4.20J/cal芯线在20度时的电阻温度系数α＝3.930*10-31/度（铝芯取4.03*10-3；铜芯取3.93*10-3）芯线在20度时的集肤效应系数kj＝1.052（3芯电缆：120mm2及以下取1.0；150mm2取1.01；185mm2取1.02；240mm2取1.035；300mm2取1.052；400mm2取1.095）芯线在20度时的电阻率ρ20＝1.840*10-6（铝芯取3.1*10-6欧*cm；铜芯取1.84*10-6欧*cm）芯线在短路时的最高允许温度θd＝200度（交联聚乙希绝缘取200度；聚氯乙希绝缘取130度）电缆敷设地点的环境温度θ0＝40度芯线在额定时的最高允许温度θc＝90度（交联聚乙希绝缘取90度；聚氯乙希绝缘取65度）