關(guān)于礦熱爐低壓補(bǔ)償?shù)乃伎糚PT

1、北京科技大學(xué)北京科技大學(xué) 冶金與生態(tài)工程學(xué)院冶金與生態(tài)工程學(xué)院鐵合金與電熱冶金鐵合金與電熱冶金課題組課題組宣講人：宣講人： 李忠思李忠思2016-06-15太原低壓無功補(bǔ)償?shù)哪康奶岣呷霠t有功功率、增加極區(qū)功率密度補(bǔ)償計(jì)算正切值計(jì)算與正弦值計(jì)算的不同點(diǎn)電抗器的應(yīng)用礦熱爐的諧波含量、電抗器的配置 怎樣看礦熱爐礦熱爐的功率圓圖功率之間的關(guān)系 從圖中可以明確看出，爐子與低壓補(bǔ)償是礦熱爐變壓器的兩種不同的負(fù)載，相互之間沒有本質(zhì)性聯(lián)系。其中：電極電流：變壓器二次電流：變壓器一次電流：公式中：I1變壓器一次側(cè)電流A；I2變壓器二次側(cè)電流A；IL入爐電流A；IC補(bǔ)償電流A；IP入爐有功電流A；IX入爐無功電流

2、A；k變壓器變比+使用功率圓計(jì)算，能夠直觀的反映有功功率增加值，補(bǔ)償容量為：有功功率增加量：從圖中可以看出，補(bǔ)償后的有功功率增加，視在功率不變。目前礦熱爐補(bǔ)償計(jì)算方法，普遍用電力系統(tǒng)的功率因數(shù)角的正切值計(jì)算，即：一臺(tái)99MVA硅鐵礦熱爐，補(bǔ)償前功率因數(shù)0.42（1=65.165），補(bǔ)償后功率因數(shù)0.75（2=41.41），用兩種計(jì)算方式得到結(jié)果如下。正切值計(jì)算功率圓計(jì)算有功增加至變壓器容量：310000kVA；一次額定電壓：35kV二次電壓范圍：270.0174.0149.1V；二次運(yùn)行電壓：195V產(chǎn)品:工業(yè)硅低壓補(bǔ)償：安裝容量20790kvar，運(yùn)行容量9240kvar 由于是電弧生產(chǎn)，懷

3、疑投入低壓補(bǔ)償后有諧波產(chǎn)生，決定對爐況相對較差的2#爐進(jìn)行諧波檢測。當(dāng)要出爐時(shí)三相電流嚴(yán)重不平衡，在燒穿器工作時(shí)捕捉到了電流諧波。燒穿器從B相引出，對應(yīng)電極為C相。在正常冶煉時(shí)，諧波量很少。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 目前對于低壓補(bǔ)償?shù)恼J(rèn)知程度不統(tǒng)一