关于矿热炉低压补偿的思考PPT

1、北京科技大学北京科技大学 冶金与生态工程学院冶金与生态工程学院铁合金与电热冶金铁合金与电热冶金课题组课题组宣讲人：宣讲人： 李忠思李忠思2016-06-15太原低压无功补偿的目的提高入炉有功功率、增加极区功率密度补偿计算正切值计算与正弦值计算的不同点电抗器的应用矿热炉的谐波含量、电抗器的配置 怎样看矿热炉矿热炉的功率圆图功率之间的关系 从图中可以明确看出，炉子与低压补偿是矿热炉变压器的两种不同的负载，相互之间没有本质性联系。其中：电极电流：变压器二次电流：变压器一次电流：公式中：I1变压器一次侧电流A；I2变压器二次侧电流A；IL入炉电流A；IC补偿电流A；IP入炉有功电流A；IX入炉无功电流

2、A；k变压器变比+使用功率圆计算，能够直观的反映有功功率增加值，补偿容量为：有功功率增加量：从图中可以看出，补偿后的有功功率增加，视在功率不变。目前矿热炉补偿计算方法，普遍用电力系统的功率因数角的正切值计算，即：一台99MVA硅铁矿热炉，补偿前功率因数0.42（1=65.165），补偿后功率因数0.75（2=41.41），用两种计算方式得到结果如下。正切值计算功率圆计算有功增加至变压器容量：310000kVA；一次额定电压：35kV二次电压范围：270.0174.0149.1V；二次运行电压：195V产品:工业硅低压补偿：安装容量20790kvar，运行容量9240kvar 由于是电弧生产，怀

3、疑投入低压补偿后有谐波产生，决定对炉况相对较差的2#炉进行谐波检测。当要出炉时三相电流严重不平衡，在烧穿器工作时捕捉到了电流谐波。烧穿器从B相引出，对应电极为C相。在正常冶炼时，谐波量很少。CH-UaCH-UbCH-UcNoUn(%)Un(kV)PhaseNoUn(%)Un(kV)PhaseNoUn(%)Un(kV)Phase01100.020.6635401100.020.1823401100.020.22115020.1810.037250020.3150.064098020.1580.032295030.1640.034275030.0060.001256030.3080.0620830

4、40.0910.019233040.1410.029025040.1160.023129050.1090.023008050.3660.074112050.3830.077293060.0620.013300060.2660.054145060.2270.046309070.3890.080347070.4940.100214070.3920.079087080.1290.027348080.1120.023268080.1540.031165090.1700.035000090.0830.017259090.1680.034233100.2490.052293100.2640.0532821

5、00.2540.051271110.2620.054101110.3520.071192110.2360.048060120.0820.017101120.0850.017140120.0670.014112130.1110.023112130.1080.022338130.0770.016204140.0670.014168140.0500.010144140.0510.010079150.0370.008141150.0370.008068150.0530.011117160.0600.012087160.0900.018127160.0670.014221170.0560.0112141

6、70.0510.010237170.0940.019046180.0590.012055180.1100.022247180.0540.011021190.0350.007170190.0590.012252190.0530.011125200.0480.010168200.0500.010260200.0460.009224210.1610.033078210.2090.042093210.1710.035056UT0.7410.153000UT0.9830.198000UT0.8860.179000CH-IaCH-IbCH-IcNo.In(%)In(A)PhaseNo.In(%)In(A)

7、PhaseNo.In(%)In(A)Phase01100.0451.734301100.0526.202901100.0398.6268020.7823.520022020.5282.771286020.5772.292074034.50620.36006031.6158.505180037.31629.16005040.3121.411203040.2501.313155040.3301.316299050.9764.410273050.5152.715187051.0894.332304060.3441.553235060.3341.757234060.0910.366047070.261

8、1.177224070.3591.889223070.2010.802045080.1600.720243080.1090.574294080.1570.625212090.1090.494140090.0980.517139090.0620.246118100.1380.622056100.1230.652051100.1250.496070110.0880.397237110.0630.332277110.1160.461210120.0620.278314120.0490.258299120.0460.184288130.0540.242187130.0350.186163130.044

9、0.174253140.0430.193217140.0280.148271140.0220.086190150.0310.142269150.0290.153187150.0370.149328160.0280.125280160.0220.119237160.0270.108341170.0330.150108170.0280.145070170.0190.074079180.0300.135263180.0310.162318180.0180.071100190.0300.133217190.0210.111228190.0180.073263200.0240.106272200.0200.106314200.0220.085236210.0710.321070210.0530.281053210.0770.309039IT4.71721.31000IT1.8749.867000IT7.43529.63000 目前对于低压补偿的认知程度不统一