110KV地区电网规划+发电厂变电站主接线+潮流调压的计算 第7页
选择+5%分接头:110×(1+5%)=115.5KV
VT1MAX =(117-2.23-4.27) ×11/115.5=10.52KV>10.25KV
VT1MIN =(112-1.优"文~论'文.网
http://www.youerw.com .54) ×11/115.5 =10.31KV<10.75KV
符合要求。
6.2变电所2的调压
采用常调压,保持变压器T2的低压侧电压为10.35KV
线路压降:
V’ L2max = (24.071×6.765+17.628×17.056)/117=3.96KV
V’ L2min =(11.305×6.765+9.354×17.056)/112=2.11KV
变压器压降:
V’ T2max=(23.167×2.04+16.488×31.7)/(117-3.96)=5.04KV
V’ T2min=(11.076×2.04+9.065×31.7)/(112-2.11)=2.82KV
V T2max=(117-3.96-5.04) ×11/10.35=114.78KV
V T2min=(112-2.11-2.82) ×11/10.35=113.79
V T2AV=0.5×(114.78+113.79)=114.285
选择变压器+3.75%分接头:110×(1+5%)=115KV
V T2max=(117-3.96-5.04) ×11/114.125=10.41>10.35
V T2min =( 112-2.11-2.82) ×11/114.125=10.32<10.35
符合要求。
6.3变电所3的调压
采用逆调压,T3低压侧电压在最大负荷时为10+(1+5%)=10.5KV,最小时为10KV:
线路压降:
V’ L3max =(22.901×12.21+16.643×15.39)/117=4.58KV
V’ L3min =(11.283×12.21+9.316×15.39)/112=2.51KV
变压器压降:
V’ T3max =(22.157×2.04+15.705×31.7)/(117-4.58)=4.83KV
V’ T3min =(11.076×2.04+9.056×31.7)/(112-2.51)=2.83KV
V T3max=(117-4.58-4.83) ×11/10.05=118.35KV
V T3min=(112-2.51-2.83) ×11/10=117.33KV
V T3AV=0.5×(118.35+117.33)=117.84KV
T3必须采用有载调压,最小负荷时取116.875KV分接头,最大负荷时取111.375KV分接头:
V T3max=(117-4.58-4.83) ×11/111.375=10.62>10.5KV
V T3min=(112-2.51-2.83) ×11//116.875=10.04<10KV
符合要求。
6.4变电所4的调压
采用顺调压,变压器T4的低压侧在最大负荷时为10×(1+2.5%)=10.25KV,最小负荷时为10×(1+7.5%)=10.75KV。
线路压降:
V’ L4max =(29.38×11.61+21.717×17.587)/117=6.18KV
V’ L4min =(14.428×11.61+11.974×17.587)/112=3.38KV
变压器压降:
V’ T4max =(28.232×1.9+19.978×25.4)/(117-6.18)=5.06KV
V’ T4min =(14.11×1.9+11.493×25.4)/(112-3.38)=2.93KV
V T4max=(117-6.18-5.06) ×11/10.25=113.5KV
V T4min=(112-3.38-2.93) ×11/10.75=108.15KV
V T4AV=0.5×(113.5+108.15)=110.825KV
选择+1.25%分接头:
V T4max=(117-6.18-5.06) ×11/111.375=10.45>10.25KV
V T4min=(112-3.38-2.93) ×11/111.375=10.44<10.75KV
符合要求。优"文~论'文.网
http://www.youerw.com 6.5发电厂的调压
升压变压器的电压损耗:
V’ TAmax =(48.612×0.21+35.432×7.06)/117=2.23KV
V’ TAmin =(23.647×0.21+19.536×7.06)112=1.28KV
V’ TAmax =(117+2.23) ×10.5/(10.5±5%)=113.558~125.507KV
V’ TAmin =(112+1.28) ×10.5/(10.5±5%)=99.51~109.981KV
V’ TAAV =(113.558+109.981)/2=111.77KV
选择变压器+3.75%分接头:
V’ TAmax =(117+2.23) ×10.5/114.125=10.97<11.025KV
V’ TAmin =(112+1.28) ×10.5/114.125=10.42>9.975KV
符合要求。
第七章 经济指标计算
7.1 输电效率
最大负荷:η max= (20+23+22+28)/ 97.789×100% = 95.1%
最小负荷:η min= (10+11+11+14)/47.294×100% = 97.26%
7.2 网损计算
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110KV地区电网规划+发电厂变电站主接线+潮流调压的计算 第7页下载如图片无法显示或论文不完整,请联系qq752018766