變壓器損耗計算實例(精編)

1、 變壓器損耗計算變壓器損耗計算實例：商業(yè)用電負荷計算舉例 某超市建筑面積10000，計算負荷詳見下表： 負荷計算表設(shè)備名稱額定功率pe（KW）需要系數(shù)Kx有功功率Pjx（kw）功率因數(shù)cos功率因數(shù)正切tg無功功率（kvar）視在功率Qjxkv A應(yīng)急照明90.98.10.850.625.022普通照明3540.7247.80.850.62153.64風(fēng)機114.10.891.840.80.7568.88污水泵200.5100.80.757.5冷水機組20612060.80.75154.5冷凍泵75.50.860.40.80.7544.3熱水循環(huán)泵151150.80.7511.25空調(diào)機組12

2、5.20.8100.160.80.7575.12給水泵房27.50.8523.630.80.7517.72超市冷庫2000.81600.80.75120 合計922.93657.9視在功率：Sjx=1130.9KVA 補償前平局功率因數(shù)：cos1=0.662要求功率因數(shù)cos2補償?shù)?.9，查表得出補償電容器計算容量為： qc=919.86×0.66607千乏 故選兩臺標(biāo)準(zhǔn)電容補償柜，每臺柜裝240千乏電容，合計480千乏 驗算補償后的平均功率因數(shù)cos2 cos2= 0.915 補償后視在功率計算： Sjx=939.9KVA選擇兩臺630KVA變壓器，負荷率在74.3%。 變壓器損

3、耗計算： 變壓器冬季負荷計算表設(shè)備名稱額定功率pe（KW）需要系數(shù)Kx有功功率Pjx（kw）功率因數(shù)cos功率因數(shù)正切tg無功功率（kvar）視在功率Qjxkv A應(yīng)急照明90.98.10.850.625.022普通照明3540.7247.80.850.62153.64風(fēng)機114.10.891.840.80.7568.88污水泵200.5100.80.757.5冷水機組冷凍泵熱水循環(huán)泵151150.80.7511.25空調(diào)機組125.20.8100.160.80.7575.12給水泵房27.50.8523.630.80.7517.72超市冷庫2000.81600.80.75120 合計656.

4、53459.1 變壓器夏季負荷計算表設(shè)備名稱額定功率pe（KW）需要系數(shù)Kx有功功率Pjx（kw）功率因數(shù)cos功率因數(shù)正切tg無功功率（kvar）視在功率Qjxkv A應(yīng)急照明90.98.10.850.625.022普通照明3540.7247.80.850.62153.64風(fēng)機114.10.891.840.80.7568.88污水泵200.5100.80.757.5冷水機組20612060.80.75154.5冷凍泵75.50.860.40.80.7544.3熱水循環(huán)泵空調(diào)機組125.20.8100.160.80.7575.12給水泵房27.50.8523.630.80.7517.72超市冷

5、庫2000.81600.80.75120 合計907.93646.25變壓器損耗計算條件：1、冬季按150天計算2、夏季按210天計算3、冬季、夏季每天早上9點開店，晚上9點閉店，每天營業(yè)12小時4、變壓器在非營業(yè)期間只有監(jiān)控電源、門禁電源、值班照明運行，故每平米按3W計算，約30KW5、非營業(yè)時間，由一臺變壓器工作6、2臺變壓器各帶50%計算負荷運行,故每臺變壓器夏季帶454KVA，冬季帶368.3KVA。變壓器有功及無功損耗計算公式為：PbPkPe×(Sjx/Se)²QbQkQe×(Sjx/Se)²式中 Sjx變壓器低壓側(cè)的計算負荷Se變壓器的額定負

6、荷（變壓器銘牌）容量（KVA）得Pk變壓器空載時的有功損耗（鐵損）千瓦 Pe變壓器在額定負荷時的有功損耗（銅損）Qk（Ik%×Se）/100 （其中：Ik%為變壓器空載電流占額定電流的百分?jǐn)?shù)）Qe（Uk%×Se）/100 （其中：Uk%為變壓器短路電壓占額定電壓的百分?jǐn)?shù)）Se、Pk、Pe、Ik%、Ik%由變壓器資料中查得計算一臺變壓器夏季營業(yè)時間損耗：PbPkPe×(Sjx/Se)²1.56.03×（454/630）²4.63千瓦QbQkQe×(Sjx/Se)²（1.6%×630）/100（4%×

7、;630）/100×（454/630）² 10.08+0.252×0.52=10.08+0.13=10.21千乏夏季營業(yè)時間為150天，每天營業(yè)12小時，故夏季總營業(yè)時間為1800小時Pb總4.63×18008334千瓦Qb總10.21×180018378千乏兩臺變壓器同時運行時乘以2非營業(yè)時間變壓器損耗計算近似于空載損耗-計算略冬季計算同夏季計算方式相同，只不過運行負荷有變化，計算省略。由此可見，變壓器有功功率損耗與變壓器負荷率成正比。SCR/SCR9系列干式變壓器技術(shù)參數(shù)額定容量（KVA）電壓組合空載損耗負載損耗75（KW）空載電流(%)短

8、路阻抗75（%）聯(lián)結(jié)組標(biāo)號聲壓級（dB）高壓 H.V（KV）高壓分接范圍低壓 L.V（KV）標(biāo)準(zhǔn)/節(jié)能SCR-1006、6.3、6.6、10、10.511±2×2.50.40.44/0.371.622.24Yyno或orDyn11 SCR-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.

9、236.121.46SCR-80001.7/1.457.14SCR-10002/1.78.35SCR-12502.4/2.049.95SCR-16002.8/2.3812SCR-20003.5/2.9714.61.2SCR-25004.3/3.6517.6SCR-31535、38.5±2×2.50.414.54.2826Yyno或orDyn11SCR-4001.75.5SCR-50026.771.8SCR-6302.37.89SCR-80002.79.34SCR-1000310.74SCR-12503.513.011.6SCR-1600415.81SCR-20004.718

10、.61.4SCR-25005.522.27SCR9-1006、6.3、6.6、10、10.511±2×2.50.40.41/0.351.461.84Yyno或orDyn11SCR9-1250.48/0.411.71.6SCR9-1600.55/0.471.691.4SCR9-2000.63/0.542.33SC9R-2500.75/0.642.54SCR9-3150.92/0.783.2SCR9-4001.08/0.93.681.2SCR9-5001.18/1.04.5SCR9-6301.5/1.285.43SCR9-6301.35/1.155.516SCR9-80001.

11、6/1.366.43SCR9-10001.8/1.537.5SCR9-12502.2/1.879SCR9-16002.5/2.1310.84SCR9-20003.1/2.6413.360.8SCR9-25003.7/3.1515.86注：表中所列負載損耗以75為參考溫度，參考溫度為120時的負載損耗應(yīng)比表中所列數(shù)值增加14.5%變壓器外形尺寸防護等級IP00(不帶保護罩）額定容量（KVA）abcdefghiklmnp重量（Kg)SCR-100105071012005501254045011801502073611453501065680SCR-1251050710130045012802073

12、611453501165760SCR-1601110710132050012902113651553701175910SCR-20011107101480500145021136515537013351040SCR-25011708001550660550150022638016539013851240SCR-31512008001660550158023639017040014651470SCR-40012608001670600161024639517542014651700SCR-500126083014506501510280425138542014001900SCR-630 (4%)

13、135084015806501660295440151045015302260SCR-630 (6%)144084014506501530285434138048014402050SCR-800156084015007501580295440141052014502600SCR-100015909801570820160507501670200305450149053015203000SCR-1250168098017008501800315460160056016503600SCR-1600177099018208501840350495161559016704350SCR-20001890

14、1010182010001940375515169563017705550SCR-250019801300182010702007010002000240395535170566017706700SCR9-10010507101270550125404501250150207361145350113575SCR-1251110710132050012902113651553701175900SCR9-16011407201380500134021637016038012251060SCR9-20011407201530500149021637016038013751210SCR9-250120

15、08001640660550159022638017040014751390SCR9-31512008001690550161023639017040014951500SCR9-40013208101690600161026140518544014561940SCR9-500132084015606501620290435148044015102150SCR9-630 (4%)1380840161065016902951440154048015602390SCR-630 (6%)147084014806501560290435141019014302280SCR9-80015908501520

16、7501600300445143053014702890SCR9-100015909801600820160507501700200315460152053015503350SCR9-1250168098017008501800325470160056016503910SCR9-16001770100017408501860360505163059016904850SCR9-200019501300182010001940390530167565017706340SCR9-250020101300190010702007010002080240410550176567018507450注：10

17、0-200KW不帶風(fēng)扇，防護等級為IP00時，溫度控制箱由用戶安裝在適當(dāng)?shù)牡胤阶儔浩魍庑纬叽绶雷o等級IP20(帶保護罩）額定容量（KVA）abcdefghk重量（Kg)SCR-100140012001430550200106010050207860SCR-1251530207950SCR-16015402111100SCR-20017002111250SCR-25015001300175066011302261470SCR-3151830602361740SCR-40018602461950SCR-50017702802200SCR-630 (4%)17001940802952550SCR-6

18、30 (6%)20001400181012402852345SCR-80018602952900SCR-100019408202501201003053320SCR-125020703153950SCR-160021001600213014101401203504740SCR-200023001700221014903756000SCR-2500227010703001803957250SCR9-100140012001500550200106010050207840SCR-12515402111100SCR9-16015902161270SCR9-20017402161430SCR9-25015001300184066011302261640SCR9-3151