短路电流计算及电气设备选择表

短路电流计算变压器容量（kVA）50638010012516020025031540050063080010001250160020002500阻抗电压Uk%444444444446666666额定电压（kV）高压侧低压侧100.4100.4100.4100.4100.4100.4100.4100.4100.4100.4100.4100.4100.4100.4100.4100.4100.4100.4计算电流（A）高压侧低压侧3.0372.173.8290.934.85115.476.06144.347.58180.429.70230.9412.12288.6815.16360.8419.10454.6624.25577.3530.31721.6938.19909.3348.50#######60.62#######75.78#######97.00#######121.25#######151.56#######低压出口短路电流（kA）IpIk4.601.805.802.277.362.899.203.6111.504.5114.725.7718.407.2223.009.0228.9811.3736.8114.4346.0118.0438.6515.1649.0719.2561.3424.0676.6830.0798.1538.49122.6948.11153.3660.14高压侧硬导体规格高压进线电缆最小截面断路器（铜）TMY- (mm²)ZR-YJV22-8.7/15kV- (mm²)ZN28-12kV3（40×4）3×353（40×4）3×353（40×4）3×353（40×4）3×353（40×4）3×35630A,20kA3（40×4）3×353（40×4）3×353（40×4）3×353（40×4）3×353（40×4）3×353（40×4）3×353（40×4）3×353（50×5）3×503（50×5）3×50630A,25kA3（50×5）3×703（50×5）3×703（50×5）3×953（50×5）3×120备注：1.主变10kV高压侧电流表选用指针式6L2-V 10/0.1kV；0.4kV低压

侧电流表、电压表均选用指针式,分别为6L2-A 0～450V、6L2-A； 2.高压侧避雷器/针选用HY5WZ-17/45或HY5WZ-17/50、高压侧接地刀选用JN15-12；

3.高压开关柜规格选用KYN28-12时，可配VD4、VB2、VS1、HVF（韩国现代）、EV12型真空断路器；在箱变中选用HXGN-10箱变环网型固定式开关柜；0.4kV低压侧一般选用GGD固定式开关柜；注：1.Ip-短路电流峰值；Ik-对称稳态三相短路电流有效值；短路电流计算以上级系统容量无穷大为计算条件。 计算公式：①Ik=Se/1000(√3×Ue×Uk%)=100Se/1000(√3×0.4×Uk)=Se/√3/4Uk(kA)；②Ip=2.55Ik；③变压器：高压侧额定电流=Sr/(√3×Ue)=Se/√3/10(A)；低压侧额定电流=Sr/(√3×Ue)=Se/√3/0.4(A)；

熔断器XRNP-12kV0.5A7.5A10A10A15A15A20A25A32A40A50A80A100A125A160A160A200A250A电流互感器LZZBJ9-1015/5A 0.5/5P1515/5A 0.5/5P1515/5A 0.5/5P1515/5A 0.5/5P1515/5A 0.5/5P1515/5A 0.5/5P1525/5A 0.5/5P150.4kV低25/5A 0.5/5P15压侧40/5A 0.5/5P1540/5A 0.5/5P1550/5A 0.5/5P3060/5A 0.5/5P3075/5A 0.5/5P30100/5A 0.5/5P30150/5A 0.5/5P30200/5A 0.5/5P30200/5A 0.5/5P30250/5A 0.5/5P30低压侧硬导体规格（铜）TMY-(mm²)4（40×4）4（40×4）4（40×4）4（40×4）4（40×4）4（40×4）4（40×4）4（40×4）4（50×5）4（60×6）3（80×8）+1（60×6）3（80×8）+1（60×6）3（100×10）+1（80×8）3（125×10）+1（80×8）3（2（100×10））+1（100×3（3（125×10））+1（125×3（3（125×10））+1（125×3（3（125×10））+1（125×低压进线电缆最小截面ZR-YJV-0.6/1kV- (mm²)3×50+1×353×70+1×503×95+1×703×120+1×953×150+1×703×150+1×703×185+1×953×300+1×1502（3×150+1×70）2（3×185+1×95）3×2（1×240）+1（1×3×2（1×300）+1（1×3×4（1×150）+2（1×3×4（1×240）+2（1×3×4（1×300）+2（1×---低压断路器（电动）RMM1-100H100H250H250H250H250H400H400H630H630H800H2000200020002000320032006300脱扣电流 整定倍数80A 0.95100A 0.95125A 0.97160A 0.95200A 0.95250A 0.97315A 0.96400A 0.95500A 0.95630A 0.96800A 0.951000A 0.951250A 0.971600A 0.952000A 0.952500A 0.973200A 0.954000/4A 0.95电流互感器BH-0.66 Ⅰ（Ⅱ）100/5A100/5A150/5A200/5A200/5A250/5A400/5A400/5A500/5A750/5A800/5A1000/5A1500/5A2000/5A2000/5A2500/5A4000/5A4000/5A