1、10/0.4kV变压器与低压断路器、互感器及母线等配合表变压器容量Se(kVA)阻抗电压Uk%额定电流(A)低压出口短路电流(kA)总出线断路器额定电流(A)互感器变比(A)变压器低压侧出线选择高压侧低压侧IpIk母线槽(A)16049.2230.914.725.77250300/5-200411.5288.718.407.22315400/5-250414.4360.823.009.02400500/5630315418.2454.728.9811.37500650/5630400423.1577.436.8114.43630800/5800500428.9721.746.0118.0480
2、0800/51000630436.4909.357.9722.7310001000/51250800646.21154.749.0719.2512501500/516001000657.71443.461.3424.0616002000/520001250672.21804.276.6830.0720002500/525001600692.42309.498.1538.4925003000/5315020006115.52886.8122.6948.1132004000/5400025006144.33608.4153.3660.1440005000/55000附注：1.Ip-短路电流峰值；I
3、k-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 Ik=Se/1000(3UeUk%)=100Se/1000(30.4Uk)=Se/3/4Uk(kA)Ip=2.55Ik变压器 高压侧额定电流=Sr/(3Ue)=Se/3/10(A)低压侧额定电流=Sr/(3Ue)=Se/3/0.4(A)I短时耐受电流4S短时电流（kA）a铜系数132513铝系数8.5t短时耐受电流时间按4 秒4秒温升取215 K裸体可取180 K计算公式 I*(t/)/aGB3906附录D中公式变压器低压侧中性点接地线选择铜母线(TMY-)规格(mm2)VV电缆规格(mm2)YJV电缆规格(
4、mm2)铜母线(mm2)镀锌扁钢(mm2)4(404)3150+1701532544(404)3240+11203185+1951532544(404)2(3150+170)3300+11501534044(505)2(3240+1120)2(3150+170）2034044(636.3)32(1185)+(1185)2(3185+195）2034043(806.3)+1(636.3)32(1240)+1(1240)32(1240)+1(1240)2534053(808)+1(636.3)32(1400)+1(1400)32(1300)+1(1300)2535053(1008)+1(806.3
5、)34(1185)+2(1185)34(1150)+2(1150)3045053(12510)+1(808)34(1240)+2(1240)34(1240)+2(1240)30450532(10010)+1(10010)34(1400)+2(1400)34(1300)+2(1300)30463532(12510)+1(12510)-40480532(12510)+1(12510)-404100533(12510)+1(12516)-405808母排截面积4215262.305515210/0.4kV变压器与低压断路器、互感器及母线等配合表变压器低压侧出线选择附注：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。BV电缆(mm2)VV电缆(mm2)裸铜绞线(mm2)15015013515015013517017015017017015019519517011201120170115011501951150115019511501150195118511851120-12401150-12401185-13001240变压器低压侧中性点接地线选择
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