110kV变电站设计 本科毕业论文.doc

第 1页本科毕业论文发电厂设计上海电力学院施春迎第一章主变及所用变的选择第一节主变压器的选择一、负荷统计分析 1、 35kV 侧 Q 1max= var 44 .6197 10000 85 .0/10000 cos / 222 max 1 21 2 max 1 2K PP????? Q 2max= var 44 .6197 10000 85 .0/10000 cos / 222 max 2 22 2 max 2 2K PP????? Q 3max = var 47 .3718 6000 85 .0/6000 cos / 222 max 3 23 2 max 3 2K PP????? Q 4max = var 4500 6000 80 .0/6000 cos / 222 max 4 24 2 max 4 2K PP????? Q 5max = var 4500 6000 80 .0/6000 cos / 222 max 5 25 2 max 5 2K PP?????? 35P =P 1max +P 2max +P 3max +P 4max +P 5max = 10000+10000+6000+6000+6000=38000 (KW) ? 35Q =Q 1max +Q 2max +Q 3max +Q 4max +Q 5max = +++4500+4500= ( KVar ) S 35MAX = 2 max 35 2 max 35QP?= 2235 . 25113 8000 3?= ( KVA ) 35? Cos = MAX S P 35 max 35?=66 .45548 38000 = 3 考虑到负荷的同时率, 35kV侧最大负荷应为: S ’ 35MAX =S 35MAX ? 35?= ? = (KVA) 2、 10kV 侧:Q 1max= var 36 .1549 2500 85 .0/2500 cos / 222 max 1 21 2 max 1 2K PP?????第 2页Q 2max = var 49 .1239 2000 85 .0/2000 cos / 222 max 2 22 2 max 2 2K PP????? Q 3max = var 1125 1500 80 .0/1500 cos / 222 max 3 23 2 max 3 2K PP????? Q 4max = var 49 .1239 2000 85 .0/2000 cos / 222 max 4 24 2 max 4 2K PP????? Q 5max = var 1500 2000 80 .0/2000 cos / 222 max 5 25 2 max 5 2K PP????? Q 6max = var 74 .619 1000 85 .0/1000 cos / 222 max 6 26 2 max 6 2K PP????? Q 7max = var 750 1000 80 .0/1000 cos / 222 max 7 27 2 max 7 2K PP????? Q 8max = var 620 1000 85 .0/1000 cos / 222 max 8 28 2 max 8 2K PP????? Q 9max = var 1125 1500 80 .0/1500 cos / 222 max 9 29 2 max 9 2K PP????? Q 10max = var 62 .929 1500 85 .0/1500 cos / 222 max 10 210 2 max 10 2K PP?????? 10P =P 1max +P 2max +P 3max +P 4max +P 5max +P 6max +P 7max +P 8max +P 9max +P 10max = 2500+2000+1500+2000+2000+1000+1000+1000+1500+1500 =16000 ( KW ) ? 10Q = Q 1max +Q 2max +Q 3max +Q 4max +Q 5max +Q 6max +Q 7max +Q 8max +Q 9max +Q 10max = ++1125++1500++750+620+1125+ = ( KV ar) S 10 MAX =??? 2 max 10 2 max 10QP = 216000 ?= (KVA ) 10? Cos = MAX S P 10 10?=84 .1