某超市建筑面积10000㎡,计算负荷详见下表:负荷计算表设备名称应急照明普通照明风机污水泵冷水机组冷冻泵热水循环泵空调机组给水泵房超市冷库合计额定功率需要系数pe(KW)K某9354114.12020675.515125.227.5200有功功率功率因数Pj某(kw)coφ8.1247.891.841020660.415100.1623.63160922.93
功
率
因
数
正
切
tgφ0.620.620.750.750.750.750.750.750.750.75无功功率视在功率(kvar)Qj某kvA5.022153.6468.887.5154.544.311.2575.1217.72120657.90.90.70.80.510.810.80.850.80.850.850.80.80.80.80.80.80.80.8.5432832.4=1130.9KVA视在功率:Sj某=922.932657.92846142
补
偿
前
平
局
功
率
因
数
:
coφ1=1/1(0.75657.9)/0.75922.932≈0.662
要求功率因数coφ2补偿到0.9,查表得出补偿电容器计算容量为:
qc=919.86某0.66≈607千乏
故选两台标准电容补偿柜,每台柜装240千乏电容,合计480千乏验算补偿后的平均功率因数coφ2
coφ2=1/1(Qj某Qc)/aPj某2=1/1(0.75177.9)/0.75922.932=0.915
补偿后视在功率计算:
Sj某=922.932(657.9480)2851799.831648.4=939.9KVA选择两台630KVA变压器,负荷率在74.3%。变压器损耗计算:
变压器冬季负荷计算表
设备名称应急照明普通照明风机污水泵冷水机组冷冻泵热水循环泵空调机组给水泵房超市冷库合计额定功率需要系数pe(KW)K某9354114.12015125.227.5200有功功率功率因数Pj某(kw)coφ8.1247.891.841015100.1623.63160656.53功率因数正切tgφ0.620.620.750.750.750.750.750.75
无功功率视在功率(kvar)Qj
某
kvA5.022153.6468.887.511.2575.1217.72120459.10.90.70.80.510.80.850.80.850.850.80.80.80.80.80.8
变压器夏季负荷计算表
设备名称应急照明普通照明风机污水泵冷水机组额定功率需要系数pe(KW)K某9354114.1202060.90.70.80.51
有功功率功率因数
Pj
某(kw)
coφ8.1247.891.84102060.850.850.80.80.8功率因数正切tgφ0.620.620.750.750.75无功功率视在功率(kvar)Qj某kvA5.022153.6468.887.5154.5冷冻泵热水循环泵空调机组给水泵房
超
市
冷
库
合
计
75.5125.227.52000.80.80.850.860.4100.1623.63160907.930.80.80.80.80.750.750.750.7544.375.1217.72120646.25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30KW
5、非营业时间,由一台变压器工作
6、2台变压器各带50%计算负荷运行,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=△Pk+△Pe某(Sj某/Se)2△Qb=△Qk+△Qe某(Sj某/Se)2
式中Sj某——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——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%某Se)/100(其中:Ik%为变压器空载电流占额定电流的百分数)△Qe=(Uk%某Se)/100(其中:Uk%为变压器短路电压占额定电压的百分数)
△Pb=△Pk+△Pe某(Sj某/Se)2=1.5+6.03某(454/630)2=4.63千瓦
△Qb=△Qk+△Qe某(Sj某/Se)2=(1.6%某630)/100+(4%某630)/100某(454/630)2
=10.08+0.252某0.52=10.08+0.13=10.21千乏
夏季营业时间为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某1800=8334
千瓦千乏
△Qb总=10.21某1800=18378
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
电压组合额定容量(KVA)SCR-100SCR-125SCR-160SCR-200SCR-250SCR-315SCR-400SCR-500SCR-630SCR-630SCR-8000SCR-1000SCR-1250SCR-1600SCR-2000SCR-2500SCR-315SCR-400SCR-500SCR-630SCR-8000SCR-1000SCR-1250SCR-1600SCR-2000SCR-2500SCR9-100SCR9-125SCR9-160SCR9-200SC9R-250SCR9-315SCR9-400SCR9-500SCR9-630SCR9-630SCR9-8000SCR9-1000SCR9-1250SCR9-1600SCR9-2000SCR9-2500高压高压分接H.V范围(KV)空载损耗低压标准/节能L.V(KV)0.44/0.370.52/0.440.61/0.520.69/0.580.82/0.70.95/0.811.15/0.981.3/1.11.5/1.271.45/1.231.7/1.452/1.72.4/2.042.8/2.383.5/2.974.3/3.6514.51.722.32.733.544.75.50.41/0.350.48/0.410.55/0.470.63/0.540.75/0.640.92/0.781.08/0.91.18/1.01.5/1.281.35/1.151.6/1.361.8/1.532.2/1.872.5/2.133.1/2.643.7/3.156、6.3、6.6、10、10.511±2某2.50.435、38.5±2某2.50.46、6.3、6.6、10、10.511±2
某
2.50.4
负载损耗
75℃(KW)
1.621.92.182.592.833.594.15.016.036.127.148.359.951214.617.64.285.56.777.899.3410.7
413.0115.8118.622.271.461.71.692.332.543.23.684.55.435.56.437.5910.8413.3615.86短
路空载联结阻抗电流组标75℃(%)号(%)2.241.81.6声压级(dB)Yyno或orDyn111.461.22Yyno或orDyn111.861.61.41.81.61.44Yyno或orDyn111.2160.8注:表中所列负载损耗以75℃为参考温度,参考温度为120℃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IP00(不带保护罩)
防护等级为IP00时,温度控制箱由用户安装在适当的地方
变压器外形尺寸防护等级IP20(带保护罩)额定容量(KVA)
abc14301400120015301540170017501500130017001830186017701940181020001400186019402070210023001600170021302210227015001400120015401590174018401500130017001860187018801970184020001400188019702070210023001600170021502210235082025014301490140124012010012015066080200113010060550106050107030082025014101490140124012010012018066080200113010060550106050defghk207207211211226236246280295285295305315350375395207211216216226236261290295290300315325360390410
重
量
(Kg)86095011001250147017401950220025502345290033203950474060007250840110012701430164017802210245025802570318036704260524067908000SCR-100SCR-125SCR-160SCR-200SCR-250SCR-315SCR-400SCR-500SCR-630(4%)SCR-630(6%)SCR-800SCR-1000SCR-1250SCR-1600SCR-2000SCR-2500SCR9-100SCR-125SCR9-160SCR9-200SCR9-250SCR9-315SCR9-400SCR9-500SCR9-630(4%)SCR-630(6%)SCR9-800SCR9-1000SCR9-1250SCR9-1600SCR9-2000SCR9-2500
1070300
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