不同负载率下变压器的有功、无功损耗.pdf

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1、不同负载率下变压器的有功、无功损耗1计算目的用于基础设计和详细设计变电所负荷计算中，计入变压器的有功和无功损耗。2计算内容变压器在不同负荷率下(41%-52%)的有功和无功损耗，负荷率是指变压器二次侧所供负荷(kVA)与变压器额定容量(kVA)之比。3计算公式3.1有功损耗2SPPPkW0kSn式中，P变压器空载有功损耗，kW0P变压器短路有功损耗，kWkSn－变压器额定容量，kVAS－变压器二次侧实际负荷，kVA3.2无功损耗2SQQQ0kSnkvarI%S0nQ0

2、100u%SknQk100Q0变压器空载无功损耗，kvarQk变压器短路无功损耗，kvarI0％－变压器空载电流百分数uk%－变压器短路电压百分数P、、PI0％、uk%数据可从变压器样本或铭牌上查取。0k4计算结果见表1－表10。5说明5.1同型号、同容量的变压器，各个制造厂的数据有些出入。一般说来，短路损耗（有功、无功）相差甚微，空载损耗相差较大一点，但作为负荷统计取表列数据误差不大。对于详细设计，如已知变压器具体型号可按实际数据计算。5.2同容量9型与10型相比，后者有功损耗较小，但无功损耗相同或较大。表135kV

3、主变压器(S9系列)变压器损耗计算结果表kW/kvar序变压器容量uk%空载负载空载变压器负载率％号kVA损耗损耗电流414243444546备注kWkW％PQPQPQPQPQPQ1S9-5000/357.05.4933.030.611.0488.8411.3291.7411.6094.7211.8897.812.18100.912.48104.12S9-6300/357.56.5736.90.612.77117.213.08121.113.39125.213.71129.314.04133.514.38137.

4、83S9-8000/357.59.040.50.5515.81144.916.14149.816.49154.916.84160.217.20165.517.571714S9-10000/357.510.6247.70.5518.64181.119.03187.319.44193.719.85200.220.28206.920.71213.75S9-12500/3512.656.70.5022.13230.622.60238.923.08247.423.58256.124.08265.024.60274.16S9-16000/358.0

5、15.369.30.5026.95295.227.52305.828.11316.728.72327.829.33339.229.96350.87S9-20000/3518.183.70.5032.1736932.86382.233.58395.834.30409.835.0542435.81438.68S9-25000/3521.5199.00.4038.15436.238.97452.839.82469.840.68487.241.5650542.46523.29S9-31500/3525.6118.80.4045.57549.64

6、6.56570.547.57591.948.60613.949.66636.350.74659.2序变压器容量uk%空载负载空载变压器负载率％号kVA损耗损耗电流474849505152备注kWkW％PQPQPQPQPQPQ1S9-5000/357.05.4933.030.612.79107.313.10110.613.4211413.75117.514.0812114.42124.62S9-6300/357.56.5736.90.614.72142.215.07146.715.43151.215.80155.9

7、16.17160.716.55165.63S9-8000/357.59.040.50.5517.95176.518.33182.218.72188.119.1319419.53200.019.95206.24S9-10000/357.510.6247.70.5521.16220.721.61227.822.07235.122.55242.523.03250.123.52257.85S9-12500/3512.656.70.5025.13283.425.66292.926.21302.626.78312.527.35322.627.933

8、32.96S9-16000/358.015.369.30.5030.61362.731.27374.931.94387.332.6340033.32412.934.04426.17S9-20000/3518