变压器损耗计算实例

1、变压器损耗计算变压器损耗计算实例: 商业用电负荷计算举例某超市建筑面积10000 m2,计算负荷详见下表:负荷计算表设备名称额定功率pe (KW)需要系数Kx有功功卒Pjx (kw)功率因数cos 4功率因数正 切 tg(|)无功功率(kvar)视在功率Qjxkv A应急照明90.98.10.850.625.022普通照明3540.7247.80.850.62153.64风机114.10.891.840.80.7568.88污水泵200.5100.80.757.5冷水机组20612060.80.75154.5冷冻泵75.50.860.40.80.7544.3热水循环泵151150.80.751

2、1.25空调机组125.20.8100.160.80.7575.12给水泵房27.50.8523.630.80.7517.72超市冷库2000.81600.80.75120合计922.93657.9视在功率：Sjx= 922.932 657.92 =【846142.5 4328324 =1130.9KVA补偿前平局功率因数：cos 4 1=<1/1 + <(0.75乂 657.9)/0.75乂922.93>2 M.662要求功率因数cos 4 2补偿到0.9 ,查表得出补偿电容器计算容量为：qc=919.86 冲.66 的07 千乏故选两台标准电容补偿柜，每台柜装 240千乏

3、电容，合计480千乏验算补偿后的平均功率因数cos § 2cos 4 2=(1/1 +E，Qjx Qc)/aKPjx：2 =、'1/1 + <(0.75乂 177.9)/0.75,922.93>2= 0.915补偿后视在功率计算:Sjx= 922.932 (657.9-480)2 = .851799.8 31648.4=939.9KVA选择两台630KVA压器，负荷率在74.3%。变压器损耗计算：变压器冬季负荷计算表设备名称额定功率pe (KW)需要系数Kx有功功卒Pjx (kw)功率因数cos 4功率因数正 切 tg(|)无功功率(kvar)视在功率Qjxkv

4、A应急照明90.98.10.850.625.022普通照明3540.7247.80.850.62153.64风机114.10.891.840.80.7568.88污水泵200.5100.80.757.5冷水机组冷冻泵热水循环泵151150.80.7511.25空调机组125.20.8100.160.80.7575.12给水泵房27.50.8523.630.80.7517.72超市冷库2000.81600.80.75120合计656.53459.1变压器夏季负荷计算表设备名称额定功率pe (KW)需要系数Kx有功功卒Pjx (kw)功率因数cos 4功率因数正 切 tg(|)无功功率(kvar)

5、视在功率Qjxkv A应急照明90.98.10.850.625.022普通照明3540.7247.80.850.62153.64风机114.10.891.840.80.7568.88污水泵200.5100.80.757.5冷水机组20612060.80.75154.5冷冻泵75.50.860.40.80.7544.3热水循环泵空调机组125.20.8100.160.80.7575.12给水泵房27.50.8523.630.80.7517.72超市冷库2000.81600.80.75120合计907.93646.25变压器损耗计算条件：1、冬季按150天计算2、夏季按210天计算3、 冬季、夏季

6、每天早上9点开店，晚上9点闭店，每天营业12小时4、变压器在非营业期间只有监控电源、门禁电源、值班照明运行，故每平米按3W计算，约30KW5、非营业时间，由一台变压器工作6、2台变压器各带50制算负荷运行，故每台变压器夏季带454KVA冬季带368.3KVA变压器有功及无功损耗计算公式为： Pb=APk+A Pex （Sjx/ Se）2 Q）= aCk+左 Qex （Sjx/ Se） 2式中Sjx-一变压器低压侧的计算负荷Se-变压器的额定负荷（变压器铭牌）容量（KVA得 Pk一-一变压器空载时的有功损耗（铁损）千瓦 Pe-变压器在额定负荷时的有功损耗（铜损） Qk= （Ik%x Se） /1

7、00 （其中：Ik%为变压器空载电流占额定电流的白分数） Qb （Uk宏Se） /100 （其中：Uk%/变压器短路电压占额定电压的白分数）Ses zPk、 Pe、Ik%、Ik%由变压器资料中查得计算一台变压器夏季营业时间损耗: Pb= A Pk+A Pex (Sjx/ Se) 2= 1.5 + 6.03 X (454/630) 2 = 4.63 千瓦 Q)= A<+ Qjx (Sjx/ Se)2= (1.6%X 630) /100 + ( 4%< 630) /100 X (454/630) 2=10.08+0.252 x 0.52=10.08+0.13=10.21 千乏夏季营业时

8、间为150天，每天营业12小时，故夏季总营业时间为1800小时 Pb总=4.63 x 1800=8334 千瓦 Qb 总=10.21 x 1800= 18378 千乏两台变压器同时运行时乘以2非营业时间变压器损耗计算近似于空载损耗-计算略冬季计算同夏季计算方式相同，只不过运行负荷有变化，计算省略。由此可见，变压器有功功率损耗与变压器负荷率成正比。SCR/SCR9系列干式变压器技术参数额定容量(KVA电压组合空载损耗负载损耗75 C(KVV空载电流(%)短路阻抗75 C(%联结组标号声压级(dB)高压H.V (KV)高压分接 范围低压L.V (KV标准/节能SCR-1006、6.3、6.6、10

9、、10.511土 2X 2.50.40.44/0.371.622.24Yyno或orDy n11SCR-1250.52/0.441.9SCR-1600.61/0.522.18SCR-2000.69/0.582.59SCR-2500.82/0.72.831.8SCR-3150.95/0.813.59SCR-4001.15/0.984.1SCR-5001.3/1.15.011.6SCR-6301.5/1.276.03SCR-6301.45/1.236.121.46SCR-80001.7/1.45 7.14SCR-10002/1.78.35SCR-12502.4/2.049.95SCR-16002.

10、8/2.3812SCR-20003.5/2.9714.61.2SCR-25004.3/3.65 117.6SCR-31535、38.5土 2X 2.50.414.54.2826Yyno或orDy n11SCR-4001.75.5SCR-50026.771.8SCR-6302.37.89SCR-80002.79.34SCR-10003 110.74SCR-12503.513.011.6SCR-1600415.81SCR-20004.718.61.4SCR-25005.522.27SCR9-1000.41/0.351.461.8SCR9-1250.48/0.411.71.6SCR9-1600.55

11、/0.471.69SCR9-2000.63/0.542.33SC9R-2506、6.3、0.75/0.642.541.%4Yyno或orDyn11SCR9-3150.92/0.783.2SCR9-4001.08/0.93.686.6、10、10.511土 2X 2.50.41.2SCR9-5001.18/1.04.5SCR9-6301.5/1.285.43SCR9-6301.35/1.155.516SCR9-80001.6/1.366.43SCR9-10001.8/1.537.5SCR9-12502.2/1.879SCR9-16002.5/2.1310.84SCR9-20003.1/2.641

12、3.360.8SCR9-25003.7/3.1515.86注：表中所列负载损耗以 75C为参考温度，参考温度为120 C时的负载损耗应比表中所列数值增加14.5%变压器外形尺寸防护等级IP20(带保护罩)额定容量(KVA)abcdefghiklmnP重量(Kg)SCR-100105071012005501254045011801502073611453501065680SCR-1251050710130045012802073611453501165760SCR-1601110710132050012902113651553701175910SCR-2001110710148050014502

13、1136515537013351040SCR-25011708001550660550150022638016539013851240SCR-31512008001660550158023639017040014651470SCR-40012608001670600161024639517542014651700SCR-500126083014506501510280425138542014001900SCR-630(4%)135084015806501660295440151045015302260SCR-630(6%)144084014506501530285434138048014402

14、050SCR-800156084015007501580295440141052014502600SCR-100015909801570820160507501670200305450149053015203000SCR-1250168098017008501800315460160056016503600SCR-1600177099018208501840350495161559016704350SCR-200018901010182010001940375515169563017705550SCR-2500198013001820107020070100020002403955351705

15、66017706700SCR9-10010507101270550125404501250150207361145350113575SCR-1251110710132050012902113651553701175900SCR9-16011407201380500134021637016038012251060SCR9-20011407201530500149021637016038013751210SCR9-25012008001640660550159022638017040014751390SCR9-31512008001690550161023639017040014951500SCR

16、9-40013208101690600161026140518544014561940SCR9-500132084015606501620290435148044015102150SCR9-630(4%)138084016106501690295144 0154048015602390SCR-630(6%)147084014806501560290435141019014302280SCR9-800159085015207501600300445143053014702890SCR9-100015909801600820160507501700200315460152053015503350S

17、CR9-1250168098017008501800325470160056016503910SCR9-16001770100017408501860360505163059016904850SCR9-200019501300182010001940390530167565017706340SCR9-250020101300190010702007010002080240410550176567018507450注：100-200KW不带风扇，防护等级为IP00时，温度控制箱由用户安装在适当的地方额定容量(KVA)abcdefghk重量(Kg)SCR-100140012001430550200

18、106010050207860SCR-1251530207950SCR-16015402111100SCR-20017002111250SCR-25015001300175066011302261470SCR-3151830602361740SCR-40018602461950SCR-50017702802200SCR-630(4%)17001940802952550SCR-630(6%)20001400181012402852345SCR-80018602952900SCR-100019408202501201003053320SCR-125020703153950SCR-160021001600213014101401203504740SCR-200023001700221014903756000SCR-2500227010703001803957250SCR9-100140012001500550200106010050207840SCR-12515402111100SCR9-16015902161270SCR9-20017402161430SCR9-25015001300184066011302261640SCR9-3