香港内部传真图

1,TONGXINXIANDEYAJIANGYUQIDIANZUYOUGUAN，QIDIANZUJISUANGONGSHI： 

20℃SHI：17.5÷JIEMIANJI（PINGFANGHAOMI）=MEIQIANMIDIANZUZHI（Ω） 

75℃SHI：21.7÷JIEMIANJI（PINGFANGHAOMI）=MEIQIANMIDIANZUZHI（Ω） 

QIYAJIANGJISUANGONGSHI（ANOUMUDINGLV）：V=R×A

XIANSUNSHIYUQISHIYONGDEYAJIANG、DIANLIUYOUGUAN。 

QIXIANSUNJISUANGONGSHI：P=V×A  

P-XIANSUNGONGLV（WATE） V-YAJIANGZHI（FUTE） A-XIANDIANLIU（ANPEI）

2、TONGXINXIANDIANYUANXIANDIANLIUJISUANFA

1PINGFANGHAOMITONGDIANYUANXIANDEANQUANZAILIULIANG－－17A。 

1.5PINGFANGHAOMITONGDIANYUANXIANDEANQUANZAILIULIANG－－21A。 

2.5PINGFANGHAOMITONGDIANYUANXIANDEANQUANZAILIULIANG－－28A。 

4PINGFANGHAOMITONGDIANYUANXIANDEANQUANZAILIULIANG－－35A 

6PINGFANGHAOMITONGDIANYUANXIANDEANQUANZAILIULIANG－－48A   

10PINGFANGHAOMITONGDIANYUANXIANDEANQUANZAILIULIANG－－65A。 

16PINGFANGHAOMITONGDIANYUANXIANDEANQUANZAILIULIANG－－91A 

25PINGFANGHAOMITONGDIANYUANXIANDEANQUANZAILIULIANG－－120A。  

DANXIANGFUHEANMEIQIANWA4.5A（COS&=1），JISUANCHUDIANLIUHOUZAIXUANDAOXIAN。

3、TONGXINXIANYULVXINXIANDEDIANLIUDUIBIFA

2.5PINGFANGHAOMITONGXINXIANDENGYU4PINGFANGHAOMILVXINXIAN   

4PINGFANGHAOMITONGXINXIANDENGYU6PINGFANGHAOMILVXINXIAN   

6PINGFANGHAOMITONGXINXIANDENGYU10PINGFANGHAOMILVXINXIAN   

<10PINGFANGHAOMIYIXIACHENGYIWU>   

JI: 2.5PINGFANGHAOMITONGXINXIAN=<4PINGFANGHAOMILVXINXIAN×5>20ANPEI=4400 WA;   

4PINGFANGHAOMITONGXINXIAN=<6PINGFANGHAOMILVXINXIAN×5>30ANPEI=6600 WA;

6PINGFANGHAOMITONGXINXIAN=<10PINGFANGHAOMILVXINXIAN×5>50ANPEI=11000 WA 

TUFANGFASHITONGXINXIAN1GEPINGFANG1KW,LVXIN2GEPINGFANG1KW.DANWEISHIPINGFANGHAOMI

JIUSHIHENGJIEMIANJI（PINGFANGHAOMI）   

DIANLANZAILIULIANGGENJUTONGXIN/LVXINBUTONG，TONGXINNIYONG2.5（PINGFANGHAOMI）JIUKEYILE  QIBIAOZHUN:

0.75/1.0/1.5/2.5/4/6/10/16/25/35/50/70/95/120/150/185/240/300/400...  

HAIYOUFEIWOGUOBIAOZHUNRU：2.0   

LVXIN1PINGFANGZUIDAZAILIULIANG9A，TONGXIN1PINGFANGZUIDAZAILIULIANG13.5A

ERDIANWUXIACHENGYIJIU，WANGSHANGJIANYISHUNHAOZOU。

SANSHIWUCHENGSANDIANWU，SHUANGSHUANGCHENGZUJIANDIANWU。

TIAOJIANYOUBIANJIAZHESUAN，GAOWENJIUZHETONGSHENGJI。

CHUANGUANGENSHUERSANSI，BAQILIUZHEMANZAILIU。

1、“ERDIANWUXIACHENGYIJIU，WANGSHANGJIANYISHUNHAOZOU”SHUODESHI：

2．5mm’JIYIXIADEGEZHONGJIEMIANLVXINJUEYUANXIAN，QIZAILIULIANGYUEWEIJIEMIANSHUDE9BEI。RU2．5mm’DAOXIAN，ZAILIULIANGWEI2．5×9＝22．5(A)。CONG4mm’JIYISHANGDAOXIANDEZAILIULIANGHEJIEMIANSHUDEBEISHUGUANXISHISHUNZHEXIANHAOWANGSHANGPAI，BEISHUZHUCIJIANl，JI4×8、6×7、10×6、16×5、25×4。

2、“SANSHIWUCHENGSANDIANWU，SHUANGSHUANGCHENGZUJIANDIANWU”，SHUODESHI：

35mm”DEDAOXIANZAILIULIANGWEIJIEMIANSHUDE3．5BEI，JI35×3．5＝122．5(A)。CONG50mm’JIYISHANGDEDAOXIAN，QIZAILIULIANGYUJIEMIANSHUZHIJIANDEBEISHUGUANXIBIANWEILIANGGELIANGGEXIANHAOCHENGYIZU，BEISHUYICIJIAN0．5。JI50、70mm’DAOXIANDEZAILIULIANGWEIJIEMIANSHUDE3BEI；95、120mm”DAOXIANZAILIULIANGSHIQIJIEMIANJISHUDE2．5BEI，YICILEITUI。 

3、“TIAOJIANYOUBIANJIAZHESUAN，GAOWENJIUZHETONGSHENGJI”。

SHANGSHUKOUJUESHILVXINJUEYUANXIAN、MINGFUZAIHUANJINGWENDU25℃DETIAOJIANXIAERDINGDE。RUOLVXINJUEYUANXIANMINGFUZAIHUANJINGWENDUZHANGQIGAOYU25℃DEDIQU，DAOXIANZAILIULIANGKEANSHANGSHUKOUJUEJISUANFANGFASUANCHU，RANHOUZAIDAJIUZHEJIKE；DANGSHIYONGDEBUSHILVXIANERSHITONGXINJUEYUANXIAN，TADEZAILIULIANGYAOBITONGGUIGELVXIANLVEDAYIXIE，KEANSHANGSHUKOUJUEFANGFASUANCHUBILVXIANJIADAYIGEXIANHAODEZAILIULIANG。RU16mm’TONGXIANDEZAILIULIANG，KEAN25mm2LVXIANJISUAN。 

2.5PINGFANGHAOMITONGDIANYUANXIANDEANQUANZAILIULIANG－－28A。 

4PINGFANGHAOMITONGDIANYUANXIANDEANQUANZAILIULIANG－－35A 。 

6PINGFANGHAOMITONGDIANYUANXIANDEANQUANZAILIULIANG－－48A 。

10PINGFANGHAOMITONGDIANYUANXIANDEANQUANZAILIULIANG－－65A。 

16PINGFANGHAOMITONGDIANYUANXIANDEANQUANZAILIULIANG－－91A 。 

25PINGFANGHAOMITONGDIANYUANXIANDEANQUANZAILIULIANG－－120A。 

RUGUOSHILVXIAN，XIANJINGYAOQUTONGXIANDE1.5-2BEI。

RUGUOTONGXIANDIANLIUXIAOYU28A，ANMEIPINGFANGHAOMI10ALAIQUKENDINGANQUAN。

RUGUOTONGXIANDIANLIUDAYU120A，ANMEIPINGFANGHAOMI5ALAIQU。

DAOXIANDEJIEMIANJISUONENGZHENGCHANGTONGGUODEDIANLIUKEGENJUQISUOXUYAODAOTONGDEDIANLIUZONGSHUJINXINGXUANZE，YIBANKEANZHAORUXIASHUNKOULIUJINXINGQUEDING：

SHIXIAWU,BAISHANGER, 

ERWUSANWUSISANJIE,

QISHIJIUWULIANGBEIBAN,

TONGXIANSHENGJISUAN。

JINIJIESHIYIXIA：

JIUSHI10PINGFANGYIXIADELVXIAN，PINGFANGHAOMISHUCHENGYI5JIUKEYILE，YAOSHITONGXIANNI，JIUSHENGYIGEDANG，BIRU2.5PINGFANGDETONGXIAN，JIUAN4PINGFANGJISUAN.YIBAIYISHANGDEDOUSHIJIEMIANJICHENGYI2，ERSHIWUPINGFANGYIXIADECHENGYI4， SANSHIWUPINGFANGYISHANGDECHENGYI3， QISHIHE95PINGFANGDOUCHENGYI2.5，ZHEIMEJIJUKOUJUEYINGGAIHENHAOJIBA。 

SHIXIAWU，BAISHANGER ERWU，SANWU，SISANJIE QISHI，JIUWUERBEIBAN LUOXIANJIAYIBAN，TONGXIANSHENGJISUAN CHUANGUAN，GAOWENBA，JIUZHE SHUOMING：

1、“SHIXIAWU”ZHIDAOXIANJIEMIANZAI10PINGFANGHAOMIJIYIXIA，MEI1PINGFANGHAOMIANQUANDIANLIUWEI5ANPEI。 

2、“BAISHANGER”ZHIDAOXIANJIEMIANZAI100PINGFANGHAOMIYISHANG，MEI1PINGFANGHAOMIANQUANDIANLIUWEI2ANPEI。 

3、“ERWU，SANWU，SISANJIE”ZHIDAOXIANJIEMIANZAI25PINGFANGHAOMIJI16PINGFANGHAOMI，MEI1PINGFANGHAOMIANQUANDIANLIUWEI4ANPEI。DAOXIANJIEMIANZAI35PINGFANGHAOMIHE50PINGFANGHAOMI，MEI1PINGFANGHAOMIANQUANDIANLIUWEI3ANPEI。 

4、“QISHI，JIUWUERBEIBAN”ZHIDAOXIANJIEMIANZAI70PINGFANGHAOMIHE95PINGFANGHAOMI，MEI1PINGFANGHAOMIANQUANDIANLIUWEI2.5ANPEI。 

“LUOXIANJIAYIBAN，TONGXIANSHENGJISUAN”ZHITONGJIEMIANDELUOXIAN，KEANJUEYUANDAOXIANCHENGYI1.5BEIJISUANANQUANDIANLIU。TONGJIEMIANDETONGDAOXIANANLVDAOXIANDAYIXIANHAODENGJIJISUANANQUANDIANp=ui42000/220=191ACHUNDIANZUXINGYUANJIAN。JIANYIYONG150PINGFANGDIANLAN。

1PINGFANGSULIAOJUEYUANDAOXIANANQUANZAILIUZHI：

MINGXIAN──17AN，

CHUANGANGGUAN：ERGEN──12AN，SANGEN──11AN，SIGEN──10AN，

CHUANSULIAOGUAN：ERGEN──10AN，SANGEN──10AN，SIGEN──9AN。

HUTAOXIAN：ERXIN──13AN，SANXINSIXIN──9.6AN。

XIANGJIAOJUEYUANXIAN；MINGXIAN──18AN，CHUANGANGGUAN：ERGEN──13AN，SANGEN──12AN，SIGEN──11AN

SHUOMING：ZHINENGZUOWEIGUSUAN,BUSHIHENZHUNQUE。

LINGWAI，RUGUOANSHINEIJIZHUDIANXIAN6PINGFANGHAOMIYIXIADETONGXIAN，MEIPINGFANGDIANLIUBUCHAOGUO10AJIUSHIANQUANDE，CONGZHEIGEJIAODUJIANG，NIKEYIXUANZE1.5PINGFANGDETONGXIANHUO2.5PINGFANGDELVXIAN。

10MINEI，DAOXIANDIANLIUMIDU6A/PINGFANGHAOMIBIJIAOHESHI，10-50MI，3A/PINGFANGHAOMI,50-200MI，2A/PINGFANGHAOMI，500MIYISHANGYAOXIAOYU1A/PINGFANGHAOMI。CONGZHEIGEJIAODU，RUGUOBUSHIHENYUANDEQINGKUANGXIA，NIKEYIXUANZE4PINGFANGTONGXIANHUOZHE6PINGFANGLVXIAN。 

RUGUOZHENSHIJULI150MIGONGDIAN（BUSHUOGAOLOU），YIDINGCAIYONG4PINGFANGDETONGXIAN。

DAOXIANDEZUKANGYUQIZHANGDUCHENGZHENGBI，YUQIXIANJINGCHENGFANBI。QINGZAISHIYONGDIANYUANSHI，TEBIEZHUYISHURUYUSHUCHUDAOXIANDEXIANCAIYUXIANJINGWENTI。YIFANGZHIDIANLIUGUODASHIDAOXIANGUOREERZAOCHENGSHIGU。

XIAMIANSHITONGXIANZAIBUTONGWENDUXIADEXIANJINGHESUONENGCHENGSHOUDEZUIDADIANLIUBIAOGE。

XIANJING（DAYUEZHI）（mm2）

4、DAOXIANXIANJINGJISUAN   

DAOXIANXIANJINGYIBANANRUXIAGONGSHIJISUAN： 

TONGXIAN：S= IL / 54.4*U` 

LVXIAN：S= IL / 34*U`  

SHIZHONG：

I——DAOXIANZHONGTONGGUODEZUIDADIANLIU（A） 

L——DAOXIANDEZHANGDU（M） 

U`——CHONGXUDEDIANYUANJIANG（V） 

S——DAOXIANDEJIEMIANJI（MM2） 

SHUOMING： 

1、U`DIANYAJIANGKEYOUZHENGGEXITONGZHONGSUOYONGDESHEBEI（RUTANCEQI）FANWEIFENJIXITONGGONGDIANYONGDEDIANYUANDIANYAEDINGZHIZONGHEQILAIKAOLVXUANYONG。 

2、JISUANCHULAIDEJIEMIANJIWANGSHANGKAO.JUEYUANDAOXIANZAILIULIANGGUSUAN。

★LVXINJUEYUANDAOXIANZAILIULIANGYUJIEMIANDEBEISHUGUANXI（25DU）

★TONGXINJUEYUANDAOXIANZAILIULIANGYUJIEMIANDEBEISHUGUANXI（25DU）

5、ZAILIULIANG

GUSUANKOUJUE：

ERDIANWUXIACHENGYIJIU，WANGSHANGJIANYISHUNHAOZOU。

SANSHIWUCHENGSANDIANWU，SHUANGSHUANGCHENGZUJIANDIANWU。

TIAOJIANYOUBIANJIAZHESUAN，GAOWENJIUZHETONGSHENGJI。

CHUANGUANGENSHUERSANSI，BAQILIUZHEMANZAILIU。 

SHUOMING：

BENJIEKOUJUEDUIGEZHONGJUEYUANXIAN(XIANGPIHESULIAOJUEYUANXIAN)DEZAILIULIANG(ANQUANDIANLIU)BUSHIZHIJIEZHICHU，ERSHI“JIEMIANCHENGSHANGYIDINGDEBEISHU”LAIBIAOSHI，TONGGUOXINSUANERDE。YOUBIAO5 3KEYIKANCHU：BEISHUSUIJIEMIANDEZENGDAERJIANXIAO。

1、“ERDIANWUXIACHENGYIJIU，WANGSHANGJIANYISHUNHAOZOU”SHUODESHI：

2．5mm’JIYIXIADEGEZHONGJIEMIANLVXINJUEYUANXIAN，QIZAILIULIANGYUEWEIJIEMIANSHUDE9BEI。RU2．5mm’DAOXIAN，ZAILIULIANGWEI2．5×9＝22．5(A)。CONG4mm’JIYISHANGDAOXIANDEZAILIULIANGHEJIEMIANSHUDEBEISHUGUANXISHISHUNZHEXIANHAOWANGSHANGPAI，BEISHUZHUCIJIANl，JI4×8、6×7、10×6、16×5、25×4。

2、“SANSHIWUCHENGSANDIANWU，SHUANGSHUANGCHENGZUJIANDIANWU”SHUODESHI：

35mm”DEDAOXIANZAILIULIANGWEIJIEMIANSHUDE3．5BEI，JI35×3．5＝122．5(A)。CONG50mm’JIYISHANGDEDAOXIAN，QIZAILIULIANGYUJIEMIANSHUZHIJIANDEBEISHUGUANXIBIANWEILIANGGELIANGGEXIANHAOCHENGYIZU，BEISHUYICIJIAN0．5。JI50、70mm’DAOXIANDEZAILIULIANGWEIJIEMIANSHUDE3BEI；95、120mm”DAOXIANZAILIULIANGSHIQIJIEMIANJISHUDE2．5BEI，YICILEITUI。

SHANGSHUKOUJUESHILVXINJUEYUANXIAN、MINGFUZAIHUANJINGWENDU25℃DETIAOJIANXIAERDINGDE。RUOLVXINJUEYUANXIANMINGFUZAIHUANJINGWENDUZHANGQIGAOYU25℃DEDIQU，DAOXIANZAILIULIANGKEANSHANGSHUKOUJUEJISUANFANGFASUANCHU，RANHOUZAIDAJIUZHEJIKE；DANGSHIYONGDEBUSHILVXIANERSHITONGXINJUEYUANXIAN，TADEZAILIULIANGYAOBITONGGUIGELVXIANLVEDAYIXIE，KEANSHANGSHUKOUJUEFANGFASUANCHUBILVXIANJIADAYIGEXIANHAODEZAILIULIANG。RU16mm’TONGXIANDEZAILIULIANG， KEAN25mm2LVXIANJISUANHENGJIEMIANJIYUEDA，DIANZUYUEXIAO，XIANGTONGDIANYAXIATONGGUODEDIANLIUYUEDA。

JIATINGYONGDIANXIAN，YIBANDOUSHIYONGJIATINGDIANLUXITONGBUZHIFANGFALIDEJINGYANGONGSHIJISUAN。DAOXIANDEXUANZEYITONGXINDAOXIANWEILI，QIJINGYANGONGSHIWEI：DAOXIANJIEMIAN（DANWEIWEIPINGFANGHAOMI）≈I/4(A) 。  

YUE1PINGFANGHAOMIJIEMIANDETONGXINDAOXIANDEEDINGZAILIULIANG≈4A ，2.5PINGFANGHAOMIJIEMIANDETONGXINDAOXIANDEEDINGZAILIULIANGYUEWEI10AN。 

QISHIDAOXIANDEZAILIULIANGDUODAZHUYAOYAOKANDAOXIANSANRETIAOJIANHEBUXIANCHANGSUODEZHONGYAOXING。 

 JIAKONGFUSHEDAOXIANDESANRETIAOJIANJIUHAOXIE，CHUANGUAN、MAIQIANGDENGFENGBIANFUDAOXIANDESANRETIAOJIANJIUYAOCHAXIE；DUOGENDAOXIANBIDANGENDAOXIANSANRETIAOJIANCHAXIE，YIGENGUANLIDAOXIANYUEDUOSANREYUECHA。TONGYANGDAXIAODEDAOXIANZAISANRETIAOJIANHAODEQINGKUANGXIAZAILIULIANGKEYIDAXIE，ERSANRETIAOJIANCHADEQINGKUANGXIAZAILIULIANGJIUYAOXIAOXIE。  

BUXIANCHANGSUOHENZHONGYAO，ANQUANYAOQIUGAO，ZAILIULIANGJIUXIAO，BUSHIHENZHONGYAODECHANGSUOZAILIULIANGJIUDAXIE。SHANGMIANSHUODEJIATINGBUXIANDAOXIANZAILIULIANGJIUHENXIAO。

YANGEYAOQIUJIUYONGDAOXIANJIEMIANJICHENGYI4ZUOWEIZAILIULIANG。ZAILIULIANGXIAO，DAOXIANJIUYAODEDUO，CHENGBENJIUGAO。WEILEJIANGDICHENGBEN，YOUBAOZHENGANQUAN，HENDUOJIAZHUANGZAIBUSHIFENGBIBUXIANSHIJIUCAIYONGDAOXIANJIEMIANJICHENGYI5BEIHUOZHE6BEILAITIGAODAOXIANDEZAILIULIANG。

ZHEIYESHIJIATINGBUXIANDEZUIDAZAILIULIANG，ZAIDAJIUBUNENGBAOZHENGJIATINGDIANQIANQUANZHENGCHANGDESHIYONGLE。RUGUOSHIGONGYEYONGDIAN，SHIKEYIYONGDAODAOXIANJIEMIANJICHENGYI9BEIZUOYOUDEZAILIULIANG。

YONGJIATINGBUXIANJINGYANGONGSHILAIKAN2.5PINGFANGTONGXINDAOXIANZAILIULIANGJIUSHI2.5*4SHIDUIDE，2.5*5YEKEYI，YEYOUYONG2.5*6DE。DANSHIGONGCHANGDENGSANRETIAOJIANHAODEDIFANGYEKEYIYONG2.5*9SHENZHI2.5*10 

ZONGZHI，TONGYIDAOXIANZAIBUTONGDETIAOJIAN、BUTONGDEYAOQIUXIASHIYOUBUTONGDEZAILIULIANG。 

XIAMIANJIGEDAOXIANZHANGQIYUNXUZAILIULIANGBIAOJINICANKAO，TADEZAILIULIANGYESHIYOUTIAOJIANDE，ERQIESHIZUIDADE。

6、TONGLVXIANMEIQIANMIDUIYINGDIANZU  

1、BIAOCHENGJIEMIANJI/ (TONGXINXIAN）

2、BIAOCHENGJIEMIANJI/ (LVXINXIAN）

DIANZUGONGSHI：

YAJIANG=2XDIANZUXSHEBEIZONGDIANLIU－JIAOLIUDIANYA＝SHEBEIGONGDIANDIANYA

R=p*l/s

p—DIANZULVCHABIAOQIU；

l—DIANZUZHANGDU；

s—YUDIANLIUCHUIZHIDEDIANZUJIEMIANMIANJI 

LIANGGEDIANZURCHUANLIANHUIBIANDA,CHENGWEI2R，YIWEIZHEZHANGDUZENGJIA1BEI，DIANZUZHIZENGJIA1BEI,DIANZUYUZHANGDUCHENGZHENGBI。

LIANGGEDIANZURBINGLIAN,1/2R,HENGJIEMIANJIZENGJIA1BEI，DIANZUZHIBIANWEI1/2，DIANZUYUJIEMIANJICHENGFANBI。 

YINCI：

R=pl/S.  p=RS/l  

JINSHUSIJIUSHIYIGENSHUIGUAN，DIANLIUJIUSHISHUIGUANLIDEXIAOYU，DANGSHUIGUANZHANGSHIYUJIUGANJUECONGZHEIDUANDAONEIDUANZULIHENDAHENKUNNAN，DANGRANGUANZIYUEXI（JIEMIANXIAO）GANJUEYEYUEYUNDONGDAOLINGYIDUANGENGKUNNAN。DIANZULVJIUSHISHUIDUIYUDEZULIZHEIGEXINGZHIDECHANGSHU，WULUNNIGUANZIDUOZHANGHUOZHEDUOXI，SHUIDUIYU（DIANZI）DEZULITONGLEISHUIDEGUANZISHIYIYANGDE  TONGDEDIANZULV0.0175，LVDEDIANZULV0.026。CONGZAILIULIANGSHANGLAIJIANG，4PINGFANGTONGXIANGDANGYULVXIAN4*0.026/0.0175＝4*1.485＝5.94PINGFANG。 

DANYOUYULVDENAIREXINGBITONGCHA，SUOYI4PINGFANGTONGXIANKEYONGDIANLIUNENGCHAOGUO6PINGFANGLVXIAN。 

10PINGFANGLIANGXINDIANLAN，WENDU20SHIYUNXUZAILIULIANGWEI75A，DIANYAJIANGWEI4.67MV/MI ZAI220VDIANYAXIAKEYIDAIDONG16.5KWYINEIDEDIANQIJIEMIAN1PINGFANGHAOMIZHANGDU1MIDETONGXINXIANZAI20SHESHIDUSHIDIANZUWEI0.018OU,R=P*L/S(PDIANZUXISHU.LZHANGDUMI.SJIEMIANPINGFANGHAOMI)DIANZUWEI0.72OU。 

220VDIANYAXIAXIANSUNDEJISUANWEI：

P=I2R（pSUNSHIGONGLVW，iSHEBEIDIANLIU，rDIANLANDIANZU） 

SHEGONGZUOSHISHEBEIDIANLIUWEI50A，ZESUNSHIGONGLVWEI50*2*0.72=72W。

DIANZULVYINGWEI

p=0.0175OU.mm^2/m =1.75*10^-8OU.m  

L=6000mm=6m,S=6mm^2  

R=pL/S=0.0175*6/6=0.0175OU

R=PL/S   

RSHIDIANZU（DANWEISHIΩ），PSHIGAIZHONGCAILIAODEDIANZULV（TONGDEDIANZULVWEI0.0175 ），LSHIDAOTIZAIDIANLIUFANGXIANGSHANGDEZHANGDU（DANWEISHIMIm)，SSHIDAOTICHUIZHIYUDIANLIUFANGXIANGDEHENGJIEMIANJI（DANWEISHIPINGFANGMI）。

ZHONGLIANGYONGM=PVLAIJISUAN，MSHIZHONGLIANG（DANWEISHIkgQIANKE)PSHIMIDU（TONGDEMIDU=8.9×103QIANKE/LIFANGMI）VSHITIJI（DANWEISHILIFANGMI）。

7、JULISHUOMING   

RUO500WDEGONGLVYONGDUOSHAOPINGFANGDEXIANLANLE？？ZHEIGEJISUANGONGSHISHISHENME？

ZHEIYAOKANNIYONGSANXIANGHAISHIDANXIANG。

DANXIANGANP=UI 

SANXIANGANP=1.732*UI  

JIASHENISHIDANXIANG：P=UI  I=P/U=500/220=2.27  AN 

JIASHENISHISANXIANG ：P=1.732UI   I=P/1.732U=500/1.732*380=0.75AN

YAJIANG=DIANLIU*DAOXIANDIANZU    

DAOXIANDIANZU=(DAOXIANZHANGDU*DIANZULV)/DAOXIANJIEMIANJI  

DIANLIU=YONGDIANGONGLV/YONGDIANDIANYA 

TONGDEDIANZULV=1.75*10-8CIFANGOU.MI

1.5PINGFANGDETONGXIANJIUSHI1.5mm2JIEMIANJIDETONGXIAN,ZHEIYANG2000mZHANGDETONGXIANDIANZU(CHANGWEN)WEI:  

(2000m*1.75*10-8CIFANGOU.m)/1.5*10-6CIFANGm2 =23.33OUMU  

ZHEIYANGRUGUONIDAOXIANSHANGTONGGUO1ADEDIANLIU,ZEYAJIANGWEI23.3V。 YEJIUMEIPINGFANGMIDUIDIANYAYAJIANGWEI0.0024mv。   

JIARUNIYONGDIANDIANQIEDINGGONGLVWEI1QIANWA,EDUGONGZUODIANYAWEI220V,ZEYONGZHEIYANGDEDAOXIANDEHUA,YAJIANGWEI:71.5V (YUEYOUSANFENZHIYIDEDIANNENGDOULANGFEIDAODAOXIANSHANGLE)  JIARUNIJIELEGE100WADEGONGLV,ZEYAJIANGWEI:10.1V (JIBENKEYIHULVELE,BUYINGXIANGDIANQIZHENGCHANGGONGZUO)    

SUOYIJIANYISHIYONGGONGLVBUYAOCHAOGUO200WWEIHAO,CHAOGUO200WLE,NIYONGDIANDIANQISHANGDESHIJIDIANYAJIANGDIYU200V。 

FEN3DANGJISUAN，SHUOMINGFUZAIQINGKUANG，YIDIANJIWEIFUZAIXINGSUAN。 

1、 DIANXIANZHANGDU：L＝400MI，

DIANJIGONGLV：15kw＋12kw＋18kw＝45KW，

DIANLIU：I≈90A，TONGXIANJIEMIAN：S＝25PINGFANG，

TONGXIANDIANZULV：ρ＝0.0172

QIU400MIJULIXIANZU(DANXIAN)： 

R＝ρ×(L/S)＝0.0172×(400/25)≈0.275(Ω) 

QIU400MIJULIDIANYAJIANG(DANXIAN)：U＝RI＝0.275×90≈25(V) 

GAIDUANXIANDIANYAWEI： 

380－25×2(SHUANGXIAN)＝330(V) 

2、 DIANXIANZHANGDU：L＝600－400＝200MI，

DIANJIGONGLV：12kw＋18kw＝30KW，I≈60A

QIU200MIJULIXIANZU(DANXIAN)： 

R＝ρ×(L/S)＝0.0172×(200/25)≈0.138(Ω) 

QIU200MIJULIDIANYAJIANG(DANXIAN)： 

U＝RI＝0.138×60≈8(V) 

GAIDUANXIANDIANYAWEI：

380－(25＋8)×2＝314(V) 

3、DIANXIANZHANGDU：L＝700－600－400＝100MI，

DIANJIGONGLV：18KW，

I≈36A 

QIU100MIJULIXIANZU(DANXIAN)： 

R＝ρ×(L/S)＝0.0172×(100/25)≈0.069(Ω) 

QIU100MIJULIDIANYAJIANG(DANXIAN)： 

U＝RI＝0.069×36≈2.5(V) 

MODUANDIANYAWEI： 

380－(25＋8＋2.5)×2＝309(V) 

JULI：RUGUOYONG4PINGFANG(mm)TONGXIAN,XIANZHANG:200m.（SANXIANGSIXIAN）。NEIME30RIXIANDEHAODIANYOUDUOSHAO?  6PINGFANG(mm)DEXIANYOUSHIDUOSHAO?  

1PINGFANGHAOMIDENGYU1/1000000 PINGFANGMI

（1PINGFANGHAOMI=0.01PINGFANGLIMI=0.0001PINGFANGFENMI=0.0000 01PINGFANGMI，1HAOMI=1/1000MI  

1PINGFANGHAOMI=1/(1000*1000)PINGFANGMI ） 

WUTIDIANZUGONGSHI：

R=ρL/S  

SHIZHONG： 

RWEIWUTIDEDIANZU（OUMU）；  

ρWEIWUZHIDEDIANZULV，DANWEIWEIOUMUMI（Ω. mm2/m)。  

LWEIZHANGDU，DANWEIWEIMI（m）  

SWEIJIEMIANJI，DANWEIWEIPINGFANGMI（mm2） 

OUMUDINGLV(I=U/R) 

DIANXIANSHANGDEDIANYAJIANGDENGYUDIANXIANZHONGDEDIANLIUYUDIANXIANDIANZUDECHENGJI（U=I*R） 

GONGLVJISUANGONGSHIP=U2/R（UDAIBIAODIANYA、RDAIBIAODIANZU） 

CHUNYINXIANZAI0℃DEDIANZULVSHI0.016 Ω.mm2/m（OUMUMI ），  CHUNTONGXIANZAI0℃SHIDEDIANZULVSHI0.0175 Ω.mm2/m（OUMUMI），DIANZUWENDUXISHUSHI0.00393/℃。 CHUNLVXIANZAI0℃DEDIANZULVSHI0.0283 Ω.mm2/m（OUMUMI）， 

ρ=ρo(1+a*t)

SHIZHONG 

ρ——ZAItSHESHIDUSHIDEDIANZULV  

ρo——ZAI0℃SHIDEDIANZULV  

t——WENDU   

CHUNTONGXIANZAI21℃DUSHIDEDIANZULV =0.0175(1+0.00393*21)=0.0189 Ω.mm2/m） R=0.0175X200/4=0.875OUMU  

30RIDEHAODIANLIANG，RUGUOSHI220VDEDIANYA，NEIMEXIANYAOQIUCHUGONGLV   P=U2/R=2202/0.875=55.314W 

（ZHEIZHONGZHUANGTAISHIDIANXIANZHIJIEGOUCHENGHUILU，YEJIUSHISHUOBUJIERENHEJIAYONGDIANQI。RUGUOZHENZHEIMEZUOKONGKAIHUIZHIJIETIAOZHA!）  

55.314X30X24÷1000=39.826DU （1DUDIAN=1QIANWASHI）  

DIANYASUNSHI=∑(P*L)/(C*S) 

P:DIANLUZONGGONGLV(KW) L:DIANYUANJUFUHEDEJULI(m)  C:CAILIAOXISHU (380VSHI,TONGQU77,LV46.3;220VSHI,TONGQU12.8,LVQU7.75)  S:DAOXIANJIEMIANJI(mm)

8 、BUTONGJINSHUDAOTIDIANZULV  

JIZHONGJINSHUDAOTIZAI20℃SHIDEDIANZULV

(1)YIN 1.65（OU） × 10-8（MI）

(2)TONG 1.75 × 10-8    

(3)LV 2.83 × 10-8    

(4)WU 5.48 × 10-8    

(5)TIE 9.78 × 10-8    

(6)BO 2.22 × 10-7    

(7)MENGTONG 4.4 × 10-7    

(8)GONG 9.6 × 10-7    

(9)KANGTONG 5.0 × 10-7    

(10)NIEGEHEJIN 1.0 × 10-6    

(11)TIEGELVHEJIN1.4 × 10-6     

(12)LVNIETIEHEJIN1.6 × 10-6   

(13)SHIMO(8～13)×10-6