变压器空载无功计算

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1、.配电变压器空载无功损耗的就地补偿容量的计算在配电系统中变压器的空载无功损耗是用来产生激磁电流，或者说是空载电流I0的，与负荷无关。而且当一次电压不变时，其值基本上是个恒量。由电工原理知道：电容电流与电感电流方向相反，其相位超前电压90°.利用这个原理，可以用电容电流来抵消变压器的激磁电流（即电感电流），使电网总的无功电流减少，具体办法是配电变压器高压侧就地并入适当容量的电容器。补偿之后，这部分无功功率不像补偿前那样由电网输送，而且由就地补偿电容器供给。这样可以提高电网输送能力，减少线路和变压器损耗，减轻电源负担。根据变压器空载无功损耗计算公式：式中：I空%—变压器空

2、载电流的百分值（标么值）：Sn—变压器额定容量，KVA所需安装补偿电容器容量用Qc表示，Qc=Q空，即得：【例1】查产品目录手册的SL7-200/10型变压器的空载电流为2.4，则【例2】查产品目录手册的S7-200/10型变压器的空载电流为1.5，则...产品目录所列变压器空载电流百分值是一个保证值，实际上生产出来的变压器的空载电流百分值远小于此值，一般仅为保证值的50%～60%左右，实际计算时，应从实际产品样本或说明书上查得空载电流百分值。变压器损失计算数据型号容 量空载损失短路损失空载电流短路电压有功不变损失无功不变损失有功损失常数无功损失常数S7800.271

3、.652.404.5019413821.28906252.8125000S71000.322.002.304.5023016561.00000002.2500000S71600.462.852.104.5033124190.55664061.4062500S72000.543.402.104.5038930240.42500001.1250000S72500.644.002.004.5046136000.32000000.9000000S73150.764.802.004.5054745360.24187450.7142857S74000.925.801.904.50

4、66254820.18125000.5625000S75001.086.901.904.5077868400.13800000.4500000S76301.408.501.805.50100881650.10707990.4365079S78001.6610.401.805.501195103680.08125000.3437500S710001.9312.181.705.501390122400.06090000.2750000S712502.3514.491.605.501692144000.04636800.2200000S716003.0017.301.505

5、.502160172800.03378910.1718750S9300.130.602.104.00944543.33333336.6666667S9500.170.872.004.001227201.74000004.0000000S9630.201.041.904.001448621.31015373.1746032S9800.241.251.804.0017310370.97656252.5000000S91000.291.501.604.0020911520.75000002.0000000S91250.341.801.504.0024513500.57600

6、001.6000000S91600.402.201.404.0028816130.42968751.2500000S92000.482.601.304.0034618720.32500001.0000000S92500.563.051.204.0040321600.24400000.8000000S93150.673.651.104.0048224950.18392540.6349206S94000.804.301.004.0057628800.13437500.5000000S95000.965.101.004.0069136000.10200000.4000000

7、S96301.206.200.904.5086440820.07810530.3571429S98001.407.500.804.50100846080.05859380.2812500S910001.7010.300.704.50122450400.05150000.2250000S912501.9512.000.604.50140454000.03840000.1800000S916002.4014.500.604.50172869120.02832030.1406250SJ1000.732.407.504.5052654001.20000000