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电缆压降原因是什么?如何计算?

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阅读次数:54    2019-11-04 13:44:00

1

DIANLANDIANYAJIANGCHANSHENGDEYUANYIN

 

北京快乐8官网YINGYUZHONG“Voltagedrop”SHIDIANYAJIANG,“drop”SHI“WANGXIALA”DEYISI。DIANLIXIANLUDEDIANYAJIANGSHIYINWEIDAOTICUNZAIDIANZU。ZHENGYINWEICI,BUGUANDAOTICAIYONGNAZHONGCAILIAO(TONG/LV)DOUHUIZAOCHENGXIANLUYIDINGDEDIANYASUNHAO,ERZHEIZHONGSUNHAO(YAJIANG)BUDAYUBENSHENDIANYADE5%SHIYIBANSHIBUHUIDUIXIANLUDEDIANLIQUDONGCHANSHENGHOUGUODE。

 

LIRU380VDEXIANLU,RUGUODIANYAJIANGWEI19V,YEJIDIANLUDIANYABUDIYU361V,JIUBUHUIYOUHENDADEWENTI。DANGRANWOMENSHIXIWANGZHEIZHONGYALIJIANGYUEXIAOYUEHAO。YINWEIYALIJIANBENSHENSHIYIZHONGDIANLISUNHAO,SUIRANSHIBUKEBIMIAN,DANWOMENZONGXIWANGYALIJIANGSHICHUYUYIGEKEJIESHOUDEFANWEINEI。

 

2

XIANLUDIANYAJIANGDEJISUANGONGSHI

 

北京快乐8官网YIBANLAISHUO,JISUANXIANLUDEYAJIANGBINGBUFUZA,KEANYIXIABUZHOU:

 

1.JISUANXIANLUDIANLIUI

 I= P/1.732×U×cosθ

北京快乐8官网QIZHONG:P-GONGLV(QIANWA);U-DIANYA(kV);cosθ-GONGLVYINSU(0.8~0.85)

 

2.JISUANXIANLUDIANZUR

北京快乐8官网 R=ρ×L/S

QIZHONG:ρ-DAOTIDIANZULV(TONGXINDIANLANρ=0.01740,LVDAOTIρ=0.0283);L-XIANLUZHANGDU(MI);S-DIANLANDEBIAOCHENGJIEMIAN

 

北京快乐8官网3.JISUANXIANLUYAJIANG(ZUIJIANDANSHIYONG):

北京快乐8官网 ΔU=I×R

北京快乐8官网XIANLUYAJIANGJISUANGONGSHI:△U=2*I*R,I-XIANLUDIANLIU;L-XIANLUZHANGDU

3

DIANLANYAJIANGZENMESUAN?

 

XIANXUANQUDAOXIANZAIJISUANYAJIANG,XUANZEDAOXIANDEYUANZE:

 

JINJULIANFARETIAOJIANXIANZHIDAOXIANJIEMIAN(ANQUANZAILIULIANG);

北京快乐8官网YUANJULIZAIANQUANZAILIULIANGDEJICHUSHANG,ANDIANYASUNSHITIAOJIANXUANZEDAOXIANJIEMIAN,YAOBAOZHENGFUHEDIANDEGONGZUODIANYAZAIHEGEFANWEI;

北京快乐8官网DAFUHEANJINGJIDIANLIUMIDUXUANZE。

 

WEIBAOZHENGDAOXIANZHANGSHIJIANLIANXUYUNXING,SUOYUNXUDEDIANLIUMIDUCHENGANQUANZAILIULIANG。YIBANGUIDINGSHI:TONGXIANXUAN5~8A/mm2;LVXIANXUAN3~5A/mm2。ANQUANZAILIULIANGHAIYAOGENJUDAOXIANDEXINXIANSHIYONGHUANJINGDEJIXIANWENDU、LENGQUETIAOJIAN、FUSHETIAOJIANDENGZONGHEYINSUJUEDING。

 

YIBANQINGKUANGXIA,JULIDUAN、JIEMIANJIXIAO、SANREHAO、QIWENDIDENG,DAOXIANDEDAODIANNENGLIQIANGXIE,ANQUANZAILIUXUANSHANGXIAN;JULIZHANG、JIEMIANJIDA、SANREBUHAO、QIWENGAO、ZIRANHUANJINGCHADENG,DAOXIANDEDAODIANNENGLIRUOXIE,ANQUANZAILIUXUANXIAXIAN;

 

RUDAODIANNENGLI,LUODAOXIANQIANGYUJUEYUANXIAN,JIAKONGXIANQIANGYUDIANLAN,MAIYUDIXIADEDIANLANQIANGYUFUSHEZAIDIMIANDEDIANLANDENGDENG。

 

北京快乐8官网DIANYAJIANGGENJUXIALIETIAOJIANJISUAN:

 

HUANJINGWENDU40℃;DAOXIANWENDU70~90℃;DIANLANPAILIE:DANXIN,S=2D;GONGLVYINSHUcosθ=0.8;MODUANYUNXUJIANGYAJIANGBAIFENSHU≤5%。

 

北京快乐8官网QIZHONG:Vd-DIANYAJIANG,Vd=KxIxLxV0(v);I-GONGZUODIANLIUHUOJISUANDIANLIU(A);L-XIANLUZHANGDU(m);V0-BIAONEIDIANYA(V/A.m);K:SANXIANGSIXIAN K=√3 DANXIANGK=1

 

DANXIANGSHIYUNXUDIANYAJIANG:Vd=220Vx5%=11V

北京快乐8官网SANXIANGSHIYUNXUDIANYAJIANG:Vd=380Vx5%=19V

4

LITIJIEXI

 

北京快乐8官网TI1:50kw 300MI,CAIYONG25MM2XIANSHIFOUKEXING?

 

北京快乐8官网CAIYONGvvDIANLAN25TONGXIN:

北京快乐8官网QUXIANZUWEIR=0.01(300/25)=0.2,QIYAJIANGWEIU=0.2*100=20

北京快乐8官网DANXIANYAJIANGWEI20V,2XIANGWEI40V,BIANYAQIDIYADUANDIANYAWEI400V

400-40=360V

 

LVXIANR=0.0283(300/35)=0.25,QIYAJIANGWEIU=0.25*100=25,MODUANWEI350V

 

LIANXUZHANGSHIJIANYUNXINGDUIDIANJIYOUYINGXIANG,JIANYISHIYONG35TONGXINHUOZHE50LVXIAN。

 

25TONGXINQIYAJIANGU=0.0172(300/35)=0.147(≈15V)15*2=30,

MODUANWEI370V

北京快乐8官网LVXIANU=0.0283(300/50)=0.17,17*2=34,MODUANWEI366V

 

北京快乐8官网KEYIZHENGCHANGSHIYONG(BIANYAQIDIANYADUANDIANYAWEI400V)

 

50kwFUHEEDINGDIANLIU

北京快乐8官网I=P/1.732UcosΦ=50/1.732/0.38/0.8=50/0.53=94A

 

北京快乐8官网ANANQUANZAILIULIANGKECAIYONG25mm2DETONGDIANLANSUANDIANYASUNSHI:

北京快乐8官网R=ρ(L/S)=0.017X300/25=0.2Ω

DIANYASUNSHIU=IR=94X0.2=18V

 

北京快乐8官网RUGUOYONG35mm2DETONGDIANLAN,SUANDIANYASUNSHI:

R=ρ(L/S)=0.017X300/35=0.15OU

DIANYASUNSHIU=IR=94X1.15=14V

 

TI2:55BIANYAQI,DIYAJUZAIJULIBIANYAQI200MICHU。WENBIANYAQIDAODIYAJUDIANYAXUDADAO390V,XUDUOCUDIANLAN?

 

55KVABIANYAQIEDINGSHUCHUDIANLIU(DUANDIANYA400V):

I=P/1.732/U=55/1.732/0.4≈80(A)

 

JULIL=200MI,200MICHUYUNXUDIANYAWEI380VSHI,XIANYUXIANDIANYAJIANGWEI20V,DANGENDAOXIANDIANYAJIANGU=10V,TONGXINDIANXIANZULVρ=0.0172,

 

DANGENXIANZUR=U/I=10/80=0.125(Ω)

DANGENDAOXIANJIEMIAN:S=ρ×L/R=0.0172×200/0.125≈32(PINGFANG)

 

QU35PINGFANGTONGXINDIANXIAN

 

北京快乐8官网55KVADEBIANYAQI,ZUIDAGONGZUODIANLIUYUE80A,SHUCHUDIANYA400V。

 

RUGUODAODAPEIDIANJUDEDIANYAYAOQIUBUDIYU380VDEHUA,KEYONG35PINGFANGTONGDIANLANHUO50PINGFANGLVDIANLAN。

RUGUODAODAPEIDIANJUDEDIANYAYAOQIUBUDIYU390VDEHUA,KEYONG70PINGFANGTONGDIANLANHUO95PINGFANGLVDIANLAN。

北京快乐8官网RUGUODAODAPEIDIANJUDEDIANYAYAOQIUBUDIYU370VDEHUA,KEYONG25PINGFANGTONGDIANLANHUO35PINGFANGLVDIANLAN。

SANXIANGJIAOLIUXIANLUDIANYAJIANGJISUANFANGFA:DIANLIU*MEIGENDAOXIANZUKANG*1.732

DAOXIANDEZUKANGFENWEIRONGKANG、GANKANGHEDIANZU。YIBANDIYADAOXIANJIEMIANJIXIANLUZHIJISUANDIANZU,YONGDAOTIDIANZULV*DAOXIANJIEMIANJI*DAOXIANZHANGDU。ZAIZHEILI,TONGSHI0.0175*JIEMIANJI*230,LVSHI 0.029*JIEMIANJI*230。

 

北京快乐8官网YIBANQINGKUANGXIALIANXUZHANGSHIJIANYUNXINGDESHEBEIDIANLANGUIGEXUANDAYIJI。QUEBAODIANYABODONGDEQINGKUANGXIA,SHEBEIWENDINGYUNXING。

北京快乐8官网(HONGSE:WEIYAJIANGBUFUHEYAOQIU;BAISE:WEIYAJIANGFUHESHEBEISHIJIGONGZUOYAJIANGYAOQIU)

(LAIYUAN:WANGLUO,BANQUANGUIYUANZUOZHE)

 

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