收藏 分享(赏)

IEC_60287-1-1_2001_PARTE_2.pdf

上传人:益****师 文档编号:231756 上传时间:2023-03-14 格式:PDF 页数:36 大小:1.80MB
下载 相关 举报
IEC_60287-1-1_2001_PARTE_2.pdf_第1页
第1页 / 共36页
IEC_60287-1-1_2001_PARTE_2.pdf_第2页
第2页 / 共36页
IEC_60287-1-1_2001_PARTE_2.pdf_第3页
第3页 / 共36页
IEC_60287-1-1_2001_PARTE_2.pdf_第4页
第4页 / 共36页
IEC_60287-1-1_2001_PARTE_2.pdf_第5页
第5页 / 共36页
IEC_60287-1-1_2001_PARTE_2.pdf_第6页
第6页 / 共36页
亲,该文档总共36页,到这儿已超出免费预览范围,如果喜欢就下载吧!
资源描述

1、60287-1-11EC:1994+A1:1995-41-+A2:20012.3.5 Effect of large segmental type conductorsWhere the conductors are subject to a reduced proximity effect,as with large conductors ofinsulated segmental construction,the sheath loss factor of 2.3.1,2.3.2 and 2.3.3 cannotbe ignored,but shall be obtained by mul

2、tiplying the value of obtained from 2.3.6 for thesame cable configuration,by the factor F given by the formula:F=4M22+M+N24(M2+1)(N2+1)whoreM=N=Rs for cables in tretoil formationandM=RsX+XmFor cables in flat formation with equidistant spacingN=RsX-Xm3Where the spacing along a section is not constant

3、 the value of X shall be calculated asin2.3.4a).2.3.6 Single-core cables,with sheaths bonded at a single point or cross-bonded2.3.6.1Eddy-current lossesFor single-core cables with sheaths bonded at a single point or cross-bonded the eddy-current loss factor is given by:R9s01+41+42)+B121012where1,74g

4、s=1+(1Ds103-1,6)Ds40B=107PsPs is the electrical resistivity of sheath material at operating temperature(see table 1)(2.m);Ds is the external diameter of cable sheath(mm);NOTE For coresath ma outsld diametershall busd.2fs is the thickness of sheath(mm):0=2NOTE For lead-sheathed cables.gs can be taken as unity and-(B)12xcab noglected.For aluminium-sheathed cables both terms may need to be evaluated when sheath diameter is greater thanabout 70 mm or the sheath is thicker than usual.Copyright por International Electrotechnical CommissionTue Sep0915:14:412003

展开阅读全文
相关资源
猜你喜欢
相关搜索

当前位置:首页 > 专业资料 > 国外标准

copyright@ 2008-2023 wnwk.com网站版权所有

经营许可证编号:浙ICP备2024059924号-2