重磅推出：全国注册电气案例题真题披露及解答过程

zyf6737 · 发表于 2008-2-29 08:31:45

把你复习的经验告诉我们！感激！

keast · 发表于 2008-2-29 15:58:45

12 低压配电线路其中电流最大一台电动机容量为55kW，电流<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="104" UnitName="a">104A</st1:chmetcnv>，起动倍数为6。 
(1) 选择线路保护断路器为CW1型则其框架额定电流及断路器额定电流应为 
A. <st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="200" UnitName="a">200A</st1:chmetcnv>，<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="160" UnitName="a">160A</st1:chmetcnv> B. <st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="180" UnitName="a">180A</st1:chmetcnv>，<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="160" UnitName="a">160A</st1:chmetcnv> C. <st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="160" UnitName="a">160A</st1:chmetcnv>，<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="160" UnitName="a">160A</st1:chmetcnv> D. <st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="200" UnitName="a">200A</st1:chmetcnv>，<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="144" UnitName="a">144A</st1:chmetcnv> 
根据<<通用用电设备配电设计规范(GB 50055-93)>> 第2．4．4条 “当交流电动机正常运行、正常起动或自起动时，短路保护器件不应误动作。为此，应符合下列规定：<o:p></o:p>
三、瞬动过电流脱扣器或过电流继电器瞬动元件的整定电流，应取电动机起动电流的2～2.5倍。”的规定，依据<<工业与民用配电设计手册（第三版）>>668页的计算公式Iset>114.4A

keast · 发表于 2008-2-29 16:05:11

13 住宅楼做总等电位联结，供电380/220V，TN-S系统，总箱到每户配电箱采用BV-3×<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="10" UnitName="mm">10mm</st1:chmetcnv>2线，长度<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="15" UnitName="米">15米</st1:chmetcnv>。每户配电箱配出线BV-3×<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="2.5" UnitName="mm">2.5mm</st1:chmetcnv>2。卫生间设有插座，插座接用电设备线3×<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="2.5" UnitName="mm">2.5mm</st1:chmetcnv>2，长<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="2" UnitName="米">2米</st1:chmetcnv>。卫生间做局部等电位联结。卫生间至每户配电箱电线长度<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="5" UnitName="米">5米</st1:chmetcnv>。 
（1）由每户配电箱PE线，接线BV<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="True" HasSpace="False" SourceValue="2.5" UnitName="mm">-2.5mm</st1:chmetcnv>2至卫生间LEB，作为PE线与卫生间LEB之间的等电位联结。当卫生间插座所接用电设备内的相线碰金属外壳时，该用电设备的金属外壳与卫生间地之间的电压是多少？ (图片粘贴不上，抱歉了)
答:2.5mm2导体的相线与保护线回路每米的电阻为R0(忽略线路电抗），则<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="10" UnitName="mm">10mm</st1:chmetcnv>2导体的相线与保护线回路每米的电阻为0.25R，忽略AP1配电箱与AP2配电箱及主等电位联结接地与电源系统中性点接地并联阻抗，接地故障电流Id=U0/10.75R0(V),其接触电压Uc=71.6V.

keast · 发表于 2008-2-29 16:06:18

（2）由卫生间插座PE线，接线<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="2" UnitName="米">2米</st1:chmetcnv>BV<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="True" HasSpace="False" SourceValue="2.5" UnitName="mm">-2.5mm</st1:chmetcnv>2至卫生间LEB，作为PE线与卫生间LEB之间的等电位联结。当卫生间插座所接用电设备内的相线碰金属外壳时，该用电设备的金属外壳与卫生间地之间的电压是多少？
答案：Uc=20.5V

keast · 发表于 2008-2-29 16:07:07

14.某110kV变电所，采用图2所示的方孔接地网，其占地面积为<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="60" UnitName="m">60m</st1:chmetcnv>×<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="60" UnitName="m">60m</st1:chmetcnv>，材料为<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="40" UnitName="mm">40mm</st1:chmetcnv>×<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="4" UnitName="mm">4mm</st1:chmetcnv>扁纲，埋入深度为<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue=".8" UnitName="m">0.8m</st1:chmetcnv>，其接地电阻R=0.1Ω，计算用入地短路电流为20kA，那么该变电所接地网外的地表面最大跨步电压最接近的数值是： A 140V B 160V C 200V D 300V。 <o:p></o:p>
<v:shapetype id=_x0000_t75 stroked="f" filled="f" path="m@4@5l@4@11@9@11@9@5xe" o:preferrelative="t" o:spt="75" coordsize="21600,21600"><v:stroke joinstyle="miter"></v:stroke><v:formulas><v:f eqn="if lineDrawn pixelLineWidth 0"></v:f><v:f eqn="sum @0 1 0"></v:f><v:f eqn="sum 0 0 @1"></v:f><v:f eqn="prod @2 1 2"></v:f><v:f eqn="prod @3 21600 pixelWidth"></v:f><v:f eqn="prod @3 21600 pixelHeight"></v:f><v:f eqn="sum @0 0 1"></v:f><v:f eqn="prod @6 1 2"></v:f><v:f eqn="prod @7 21600 pixelWidth"></v:f><v:f eqn="sum @8 21600 0"></v:f><v:f eqn="prod @7 21600 pixelHeight"></v:f><v:f eqn="sum @10 21600 0"></v:f></v:formulas><v:path o:connecttype="rect" gradientshapeok="t" o:extrusionok="f"></v:path><o:lock aspectratio="t" v:ext="edit"></o:lock></v:shapetype><v:shape id=_x0000_i1025 style="WIDTH: 89.25pt; HEIGHT: 89.25pt" type="#_x0000_t75"><v:imagedata o:title="" src="file:///C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\msohtml1\01\clip_image001.emz"></v:imagedata></v:shape><o:p></o:p>
图2 方空接地网<o:p></o:p>
（等距圆角方格，n＝4）<o:p></o:p>
计算方法见《交流电气装置的接地》DL/T621-1997附录B发电厂、变电所经接地装置的入地短路电流及电位计算<o:p></o:p>
B2 发生接地故障时，接地装置的电位、接触电位差和跨步电位差的计算<o:p></o:p>
 2)接地网外的地表面最大跨步电位差可按下式计算<o:p></o:p>
Usmax = KsmaxUg<o:p></o:p>
式中：Usmax——最大跨步电位差，V；<o:p></o:p>
 Ksmax——最大跨步电位差系数。<o:p></o:p>
 正方形接地网的最大跨步电位差系数可按下式计算<o:p></o:p>
<v:shape id=_x0000_i1032 style="WIDTH: 227.25pt; HEIGHT: 54pt" type="#_x0000_t75" o:ole=""><v:imagedata o:title="" src="file:///C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\msohtml1\01\clip_image003.wmz"></v:imagedata></v:shape> <o:p></o:p>
<v:shape id=_x0000_i1026 style="WIDTH: 111pt; HEIGHT: 28.5pt" type="#_x0000_t75" o:ole=""><v:imagedata o:title="" src="file:///C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\msohtml1\01\clip_image005.wmz"></v:imagedata></v:shape><o:p></o:p>
<v:shape id=_x0000_i1027 style="WIDTH: 51.75pt; HEIGHT: 18.75pt" type="#_x0000_t75"><v:imagedata o:title="" src="file:///C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\msohtml1\01\clip_image007.wmz"></v:imagedata></v:shape><o:p></o:p>
 S——接地网的总面积，m2；<o:p></o:p>
 d——水平接地极的直径或等效直径，m；<o:p></o:p>
<o:p> </o:p>
 接地极用圆钢时，圆钢的直径，m［当用其他型式钢材时，其等效直径应按下式计算(图A2)：钢管，d=d1；扁钢，<v:shape id=_x0000_i1033 style="WIDTH: 38.25pt; HEIGHT: 32.25pt" type="#_x0000_t75" o:ole=""> <v:imagedata o:title="" src="file:///C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\msohtml1\01\clip_image009.wmz"></v:imagedata></v:shape>；等边角钢，d=0.84b；不等边角钢，<v:shape id=_x0000_i1034 style="WIDTH: 131.25pt; HEIGHT: 23.25pt" type="#_x0000_t75" o:ole=""> <v:imagedata o:title="" src="file:///C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\msohtml1\01\clip_image011.wmz"></v:imagedata></v:shape>］。<o:p></o:p>
<v:shape id=_x0000_i1035 style="WIDTH: 24pt; HEIGHT: 24pt" alt="" type="#_x0000_t75"></v:shape><v:shape id=_x0000_i1036 style="WIDTH: 210pt; HEIGHT: 163.5pt" type="#_x0000_t75"><v:imagedata o:title="imagee-038" src="file:///C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\msohtml1\01\clip_image014.png"></v:imagedata></v:shape><o:p></o:p>
图A2 几种型式钢材的计算用尺寸<o:p></o:p>
<o:p> </o:p>
 h——水平接地极的埋设深度，m；<o:p></o:p>
 L0——接地网的外缘边线总长度，m；<o:p></o:p>
 L——水平接地极的总长度，m。<o:p></o:p>
 对于矩形接地网，n值由下式计算<o:p></o:p>
<v:shape id=_x0000_i1028 style="WIDTH: 96.75pt; HEIGHT: 35.25pt" type="#_x0000_t75" o:ole=""><v:imagedata o:title="" src="file:///C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\msohtml1\01\clip_image016.wmz"></v:imagedata></v:shape><o:p></o:p>
<o:p> </o:p>
T=<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue=".8" UnitName="m">0.8m</st1:chmetcnv>，即跨步距离。<v:shape id=_x0000_i1037 style="WIDTH: 9.75pt; HEIGHT: 17.25pt" type="#_x0000_t75" o:ole=""> <v:imagedata o:title="" src="file:///C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\msohtml1\01\clip_image018.wmz"></v:imagedata></v:shape><o:p></o:p>
<v:shape id=_x0000_i1029 style="WIDTH: 149.25pt; HEIGHT: 20.25pt" type="#_x0000_t75" o:ole=""><v:imagedata o:title="" src="file:///C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\msohtml1\01\clip_image020.wmz"></v:imagedata></v:shape><o:p></o:p>
<v:shape id=_x0000_i1038 style="WIDTH: 416.25pt; HEIGHT: 33.75pt" type="#_x0000_t75" o:ole=""><v:imagedata o:title="" src="file:///C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\msohtml1\01\clip_image022.wmz"></v:imagedata></v:shape><v:shape id=_x0000_i1030 style="WIDTH: 330pt; HEIGHT: 105.75pt" type="#_x0000_t75" o:ole=""><v:imagedata o:title="" src="file:///C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\msohtml1\01\clip_image024.wmz"></v:imagedata></v:shape><o:p></o:p>
<o:p> </o:p>
<v:shape id=_x0000_i1031 style="WIDTH: 227.25pt; HEIGHT: 21pt" type="#_x0000_t75" o:ole=""><v:imagedata o:title="" src="file:///C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\msohtml1\01\clip_image026.wmz"></v:imagedata></v:shape>V<o:p></o:p>
<o:p> </o:p>
参考答案：B<o:p></o:p>
<o:p> </o:p>

keast · 发表于 2008-2-29 16:08:55

中间一些图形即使用CAD画了也没法粘贴出来，大家凑和着看看，当学习用了！

keast · 发表于 2008-2-29 16:12:59

15 10kV处，某用户5次谐波电流<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="17" UnitName="a">17A</st1:chmetcnv>，已知短路容量200MVA，求5次谐波电压含有率 
<o:p> </o:p>
根据<电能质量公用电网谐波(GB/T 14549-1993)>附录C谐波的基本计算式（补充件）C1 第h次谐波电压含有率HRUh与第h次谐波电流分量Ih的关系:
HRUh=1.732Un*h*Ih/10*Sk(%) (C2)<o:p></o:p>
式中 UN－电网的标称电压，kV；<o:p></o:p>
 Sk－公共连接点的三相短路容量，MVA；<o:p></o:p>
 Ih－第h次谐波电流，A；
可算出HRUh=0.74%
<o:p> </o:p><v:shape id=_x0000_i1026 style="WIDTH: 312pt; HEIGHT: 38.25pt" type="#_x0000_t75" o:ole=""><v:imagedata o:title="" src="file:///C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\msohtml1\01\clip_image003.wmz"></v:imagedata></v:shape>

keast · 发表于 2008-2-29 16:15:06

16．某10kV六相整流器，5次谐波电流17，求7次谐波电流<o:p></o:p>
<o:p> </o:p>
根据<<工业与民用配电设计手册（第三版）>>第282页常用整流器负荷电流的谐波次数、谐波电流及含量（理论最大值）见表（6-20）。<o:p></o:p>
<o:p> </o:p>
表（6-20） 常用整流器负荷电流的谐波次数、谐波电流及含量（理论最大值）单位：%<o:p></o:p>
<TABLE class=MsoNormalTable style="BORDER-RIGHT: medium none; BORDER-TOP: medium none; BORDER-LEFT: medium none; WIDTH: 437.6pt; BORDER-BOTTOM: medium none; BORDER-COLLAPSE: collapse; mso-padding-alt: 0cm 5.4pt 0cm 5.4pt; mso-border-top-alt: solid black 1.5pt; mso-border-bottom-alt: solid black 1.5pt; mso-yfti-tbllook: 191; mso-border-insideh: cell-none; mso-border-insidev: cell-none" cellSpacing=0 cellPadding=0 width=583 border=1>

<TR style="HEIGHT: 15.55pt; mso-yfti-irow: 0; mso-yfti-firstrow: yes; page-break-inside: avoid">
<TD style="BORDER-RIGHT: black 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 1pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 49.3pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid; HEIGHT: 15.55pt; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid windowtext .5pt; mso-border-bottom-alt: solid windowtext .5pt; mso-border-right-alt: solid black .75pt" vAlign=top width=66 rowSpan=2>
整流电路接线方式<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 1pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 52.8pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid; HEIGHT: 15.55pt; BACKGROUND-COLOR: transparent; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid black .75pt" vAlign=top width=70 rowSpan=2>
整流电路相数p<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 1pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 245.3pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 1pt solid; HEIGHT: 15.55pt; BACKGROUND-COLOR: transparent; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-bottom-alt: solid black .75pt" vAlign=top width=327 colSpan=9>
In/I1<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 1pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 45pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid; HEIGHT: 15.55pt; BACKGROUND-COLOR: transparent; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt" vAlign=top width=60 rowSpan=2>
<v:shapetype id=_x0000_t75 stroked="f" filled="f" path="m@4@5l@4@11@9@11@9@5xe" o:preferrelative="t" o:spt="75" coordsize="21600,21600"><v:stroke joinstyle="miter"></v:stroke><v:formulas><v:f eqn="if lineDrawn pixelLineWidth 0"></v:f><v:f eqn="sum @0 1 0"></v:f><v:f eqn="sum 0 0 @1"></v:f><v:f eqn="prod @2 1 2"></v:f><v:f eqn="prod @3 21600 pixelWidth"></v:f><v:f eqn="prod @3 21600 pixelHeight"></v:f><v:f eqn="sum @0 0 1"></v:f><v:f eqn="prod @6 1 2"></v:f><v:f eqn="prod @7 21600 pixelWidth"></v:f><v:f eqn="sum @8 21600 0"></v:f><v:f eqn="prod @7 21600 pixelHeight"></v:f><v:f eqn="sum @10 21600 0"></v:f></v:formulas><v:path o:connecttype="rect" gradientshapeok="t" o:extrusionok="f"></v:path><o:lock aspectratio="t" v:ext="edit"></o:lock></v:shapetype><v:shape id=_x0000_s1027 style="MARGIN-TOP: 7.3pt; Z-INDEX: -5; LEFT: 0px; MARGIN-LEFT: -5.4pt; WIDTH: 36.5pt; POSITION: absolute; HEIGHT: 15.75pt; TEXT-ALIGN: left; mso-wrap-edited: f; mso-position-horizontal-relative: text; mso-position-vertical-relative: text" type="#_x0000_t75" wrapcoords="-86 0 -86 21465 21600 21465 21600 0 -86 0"><v:imagedata o:title="A4" src="file:///C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\msohtml1\01\clip_image001.wmz"></v:imagedata></v:shape><v:shape id=_x0000_s1029 style="MARGIN-TOP: 23.15pt; Z-INDEX: -3; LEFT: 0px; MARGIN-LEFT: 11.15pt; WIDTH: 12.4pt; POSITION: absolute; HEIGHT: 7.9pt; TEXT-ALIGN: left; mso-wrap-edited: f; mso-position-horizontal-relative: text; mso-position-vertical-relative: text" type="#_x0000_t75" wrapcoords="-164 0 -164 21343 21600 21343 21600 0 -164 0"><v:imagedata o:title="A7" src="file:///C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\msohtml1\01\clip_image003.wmz"></v:imagedata></v:shape><o:p></o:p></TD>
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<TR style="HEIGHT: 7pt; mso-yfti-irow: 1; page-break-inside: avoid">
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 27pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid; HEIGHT: 7pt; BACKGROUND-COLOR: transparent; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid black .75pt" vAlign=top width=36>
<P class=MsoHeader style="BORDER-RIGHT: medium none; BORDER-TOP: medium none; MARGIN: 0cm 0cm 0pt; BORDER-LEFT: medium none; LAYOUT-GRID-MODE: both; BORDER-BOTTOM: medium none; tab-stops: 21.0pt; mso-padding-alt: 0cm 0cm 0cm 0cm">n=1<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 26.8pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid; HEIGHT: 7pt; BACKGROUND-COLOR: transparent; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid black .75pt" vAlign=top width=36>
5<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 26.8pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid; HEIGHT: 7pt; BACKGROUND-COLOR: transparent; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid black .75pt" vAlign=top width=36>
7<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 27pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid; HEIGHT: 7pt; BACKGROUND-COLOR: transparent; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid black .75pt" vAlign=top width=36>
11<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 27pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid; HEIGHT: 7pt; BACKGROUND-COLOR: transparent; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid black .75pt" vAlign=top width=36>
13<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 27pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid; HEIGHT: 7pt; BACKGROUND-COLOR: transparent; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid black .75pt" vAlign=top width=36>
17<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 27pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid; HEIGHT: 7pt; BACKGROUND-COLOR: transparent; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid black .75pt" vAlign=top width=36>
19<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 27pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid; HEIGHT: 7pt; BACKGROUND-COLOR: transparent; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid black .75pt" vAlign=top width=36>
<P class=MsoHeader style="BORDER-RIGHT: medium none; BORDER-TOP: medium none; MARGIN: 0cm 0cm 0pt; BORDER-LEFT: medium none; LAYOUT-GRID-MODE: both; BORDER-BOTTOM: medium none; tab-stops: 21.0pt; mso-padding-alt: 0cm 0cm 0cm 0cm">23<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 29.7pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid; HEIGHT: 7pt; BACKGROUND-COLOR: transparent; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid black .75pt" vAlign=top width=40>
25<o:p></o:p></TD></TR>
<TR style="HEIGHT: 15.55pt; mso-yfti-irow: 2; page-break-inside: avoid">
<TD style="BORDER-RIGHT: black 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 49.3pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid; HEIGHT: 15.55pt; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid windowtext .5pt; mso-border-bottom-alt: solid windowtext .5pt; mso-border-right-alt: solid black .75pt" vAlign=top width=66 rowSpan=2>
三相桥式整流<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 52.8pt; PADDING-TOP: 0cm; BORDER-BOTTOM: #d4d0c8; HEIGHT: 15.55pt; BACKGROUND-COLOR: transparent; mso-border-left-alt: solid black .75pt; mso-border-top-alt: solid windowtext .5pt; mso-border-right-alt: solid windowtext .5pt" vAlign=top width=70>
<P class=MsoHeader style="BORDER-RIGHT: medium none; BORDER-TOP: medium none; MARGIN: 0cm 0cm 0pt; BORDER-LEFT: medium none; LAYOUT-GRID-MODE: both; BORDER-BOTTOM: medium none; tab-stops: 21.0pt; mso-padding-alt: 0cm 0cm 0cm 0cm">6<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 27pt; PADDING-TOP: 0cm; BORDER-BOTTOM: #d4d0c8; HEIGHT: 15.55pt; BACKGROUND-COLOR: transparent; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt; mso-border-right-alt: solid windowtext .5pt" vAlign=top width=36>
100<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 26.8pt; PADDING-TOP: 0cm; BORDER-BOTTOM: #d4d0c8; HEIGHT: 15.55pt; BACKGROUND-COLOR: transparent; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt; mso-border-right-alt: solid windowtext .5pt" vAlign=top width=36>
20<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 26.8pt; PADDING-TOP: 0cm; BORDER-BOTTOM: #d4d0c8; HEIGHT: 15.55pt; BACKGROUND-COLOR: transparent; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt; mso-border-right-alt: solid windowtext .5pt" vAlign=top width=36>
14<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 27pt; PADDING-TOP: 0cm; BORDER-BOTTOM: #d4d0c8; HEIGHT: 15.55pt; BACKGROUND-COLOR: transparent; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt; mso-border-right-alt: solid windowtext .5pt" vAlign=top width=36>
9.1<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 27pt; PADDING-TOP: 0cm; BORDER-BOTTOM: #d4d0c8; HEIGHT: 15.55pt; BACKGROUND-COLOR: transparent; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt; mso-border-right-alt: solid windowtext .5pt" vAlign=top width=36>
7.7<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 27pt; PADDING-TOP: 0cm; BORDER-BOTTOM: #d4d0c8; HEIGHT: 15.55pt; BACKGROUND-COLOR: transparent; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt; mso-border-right-alt: solid windowtext .5pt" vAlign=top width=36>
5.9<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 27pt; PADDING-TOP: 0cm; BORDER-BOTTOM: #d4d0c8; HEIGHT: 15.55pt; BACKGROUND-COLOR: transparent; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt; mso-border-right-alt: solid windowtext .5pt" vAlign=top width=36>
5.3<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 27pt; PADDING-TOP: 0cm; BORDER-BOTTOM: #d4d0c8; HEIGHT: 15.55pt; BACKGROUND-COLOR: transparent; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt; mso-border-right-alt: solid windowtext .5pt" vAlign=top width=36>
4.3<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 29.7pt; PADDING-TOP: 0cm; BORDER-BOTTOM: #d4d0c8; HEIGHT: 15.55pt; BACKGROUND-COLOR: transparent; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt; mso-border-right-alt: solid windowtext .5pt" vAlign=top width=40>
4<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 45pt; PADDING-TOP: 0cm; BORDER-BOTTOM: #d4d0c8; HEIGHT: 15.55pt; BACKGROUND-COLOR: transparent; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt; mso-border-right-alt: solid windowtext .5pt" vAlign=top width=60>
28.9<o:p></o:p></TD>
<TD style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 45.2pt; PADDING-TOP: 0cm; BORDER-BOTTOM: #d4d0c8; HEIGHT: 15.55pt; BACKGROUND-COLOR: transparent; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" vAlign=top width=60>
104.1<o:p></o:p></TD></TR>
<TR style="HEIGHT: 7pt; mso-yfti-irow: 3; mso-yfti-lastrow: yes; page-break-inside: avoid">
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 52.8pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid; HEIGHT: 7pt; BACKGROUND-COLOR: transparent; mso-border-left-alt: solid black .75pt; mso-border-bottom-alt: solid windowtext .5pt; mso-border-right-alt: solid windowtext .5pt" vAlign=top width=70>
12<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 27pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid; HEIGHT: 7pt; BACKGROUND-COLOR: transparent; mso-border-left-alt: solid windowtext .5pt; mso-border-bottom-alt: solid windowtext .5pt; mso-border-right-alt: solid windowtext .5pt" vAlign=top width=36>
100<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 26.8pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid; HEIGHT: 7pt; BACKGROUND-COLOR: transparent; mso-border-left-alt: solid windowtext .5pt; mso-border-bottom-alt: solid windowtext .5pt; mso-border-right-alt: solid windowtext .5pt" vAlign=top width=36>
0<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 26.8pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid; HEIGHT: 7pt; BACKGROUND-COLOR: transparent; mso-border-left-alt: solid windowtext .5pt; mso-border-bottom-alt: solid windowtext .5pt; mso-border-right-alt: solid windowtext .5pt" vAlign=top width=36>
0<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 27pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid; HEIGHT: 7pt; BACKGROUND-COLOR: transparent; mso-border-left-alt: solid windowtext .5pt; mso-border-bottom-alt: solid windowtext .5pt; mso-border-right-alt: solid windowtext .5pt" vAlign=top width=36>
9.1<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 27pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid; HEIGHT: 7pt; BACKGROUND-COLOR: transparent; mso-border-left-alt: solid windowtext .5pt; mso-border-bottom-alt: solid windowtext .5pt; mso-border-right-alt: solid windowtext .5pt" vAlign=top width=36>
7.7<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 27pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid; HEIGHT: 7pt; BACKGROUND-COLOR: transparent; mso-border-left-alt: solid windowtext .5pt; mso-border-bottom-alt: solid windowtext .5pt; mso-border-right-alt: solid windowtext .5pt" vAlign=top width=36>
0<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 27pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid; HEIGHT: 7pt; BACKGROUND-COLOR: transparent; mso-border-left-alt: solid windowtext .5pt; mso-border-bottom-alt: solid windowtext .5pt; mso-border-right-alt: solid windowtext .5pt" vAlign=top width=36>
0<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 27pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid; HEIGHT: 7pt; BACKGROUND-COLOR: transparent; mso-border-left-alt: solid windowtext .5pt; mso-border-bottom-alt: solid windowtext .5pt; mso-border-right-alt: solid windowtext .5pt" vAlign=top width=36>
4.3<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 29.7pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid; HEIGHT: 7pt; BACKGROUND-COLOR: transparent; mso-border-left-alt: solid windowtext .5pt; mso-border-bottom-alt: solid windowtext .5pt; mso-border-right-alt: solid windowtext .5pt" vAlign=top width=40>
4<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 45pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid; HEIGHT: 7pt; BACKGROUND-COLOR: transparent; mso-border-left-alt: solid windowtext .5pt; mso-border-bottom-alt: solid windowtext .5pt; mso-border-right-alt: solid windowtext .5pt" vAlign=top width=60>
<P class=MsoHeader style="BORDER-RIGHT: medium none; BORDER-TOP: medium none; MARGIN: 0cm 0cm 0pt; BORDER-LEFT: medium none; LAYOUT-GRID-MODE: both; BORDER-BOTTOM: medium none; tab-stops: 21.0pt; mso-padding-alt: 0cm 0cm 0cm 0cm">13.3<o:p></o:p></TD>
<TD style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 45.2pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid; HEIGHT: 7pt; BACKGROUND-COLOR: transparent; mso-border-left-alt: solid windowtext .5pt; mso-border-bottom-alt: solid windowtext .5pt" vAlign=top width=60>
100.9<o:p></o:p></TD></TR></TABLE>
<v:shape id=_x0000_s1031 style="MARGIN-TOP: 5.55pt; Z-INDEX: -1; LEFT: 0px; MARGIN-LEFT: 117pt; WIDTH: 27pt; POSITION: absolute; HEIGHT: 15.6pt; TEXT-ALIGN: left; mso-wrap-edited: f; mso-position-horizontal-relative: text; mso-position-vertical-relative: text" type="#_x0000_t75" wrapcoords="-38 0 -38 21540 21600 21540 21600 0 -38 0"><v:imagedata o:title="A7" src="file:///C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\msohtml1\01\clip_image009.wmz"></v:imagedata></v:shape>①六相及十二相时的谐波含量 分别为29.9%和14.2%。<o:p></o:p>
<v:shape id=_x0000_s1026 style="MARGIN-TOP: 5.55pt; Z-INDEX: -6; LEFT: 0px; MARGIN-LEFT: 117pt; WIDTH: 27pt; POSITION: absolute; HEIGHT: 15.6pt; TEXT-ALIGN: left; mso-wrap-edited: f" type="#_x0000_t75" wrapcoords="-38 0 -38 21540 21600 21540 21600 0 -38 0"><v:imagedata o:title="A6" src="file:///C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\msohtml1\01\clip_image011.wmz"></v:imagedata></v:shape>②六相及十二相时的负荷电流 分别为104.4%和101.0%。<o:p></o:p>
<o:p> </o:p>
基波电流方均根值I1=I5*N=75A<o:p></o:p>
7次谐波电流方均根值I7=I1/7=12.1A<o:p></o:p>
<o:p> </o:p>

keast · 发表于 2008-2-29 16:17:09

发到这里,我们可以得出第一个结论: <<工业与民用配电设计手册（第三版）>>很重要!!!大家要好好学习!

keast · 发表于 2008-2-29 16:19:36

我认为：只要把<<工业与民用配电设计手册（第三版）>>学习完，通过第二天专业案例考试基本没有问题的！！！至于第一天的考试，大家对各种电气有关设计规范熟悉即可，通过也是问题不大的！这就是我的经验。

keast · 发表于 2008-3-3 09:34:18

17．220/380V供电系统，室外金属栏栅处发生单相接地，变压器中性点接地电阻Rb=4Ω，金属栏栅接地电阻Rd=10Ω，问 
1)接地故障电流 
2)建筑物内用电设备金属外壳的接触电压 
3)户外用电设备金属外壳的接触电压 
4)如果要将户外用电设备金属外壳的接触电压降低到50V以下，Rb应不大于多少欧姆 
此题涉及到图形及公式，留待大家解答

keast · 发表于 2008-3-3 09:34:56

18.室内变电所的变压器，油量为多少及以上时，应设置单独的变压器室： 
A 60 B <st1:chmetcnv UnitName="C" SourceValue="80" HasSpace="True" Negative="False" NumberType="1" TCSC="0" w:st="on">80 C</st1:chmetcnv> 100 D 120
 
<10kV 及以下变电所设计规范(GB50053-94)>第<st1:chsdate w:st="on" IsROCDate="False" IsLunarDate="False" Day="30" Month="12" Year="1899">4.1.4</st1:chsdate>条室内变电所的每台油量为<st1:chmetcnv UnitName="kg" SourceValue="100" HasSpace="False" Negative="False" NumberType="1" TCSC="0" w:st="on">100kg</st1:chmetcnv>及以上的三相变压器，应设在单独的变压器室内。<o:p></o:p>
<o:p> </o:p>
参考答案：C<o:p></o:p>

keast · 发表于 2008-3-3 09:35:24

19. 正常运行情况下,用电设备端子处电压偏差允许值: 
A、电动机为±5%；照明在一般工作场所为±5%；无特殊要求时为±5%。 
B、电动机为±5%；照明在一般工作场所为＋5%、－10%；无特殊要求时为±5%。 
C、电动机为±5%；照明在一般工作场所为＋5%、－10%；无特殊要求时为＋5%、－10%。 
D、电动机为±5%；照明在一般工作场所为±5%；无特殊要求时为＋5%、－10%。 
<o:p> </o:p>
 <供配电系统设计规范（GB50052-95）>第<st1:chsdate w:st="on" IsROCDate="False" IsLunarDate="False" Day="30" Month="12" Year="1899">4.0.4</st1:chsdate>条正常运行情况下，用电设备端子处电压偏差允许值(以额定电压的百分数表示)宜符合下列要求：<o:p></o:p>
 一、电动机为±5%。<o:p></o:p>
 二、照明：在一般工作场所为±5%；对于远离变电所的小面积一般工作场所，难以满足上述要求时，可为+5%，-10%；应急照明、道路照明和警卫照明等为+5%、-10%。<o:p></o:p>
 三、其它用电设备当无特殊规定时为±5%。<o:p></o:p>
<o:p> </o:p>
参考答案：A

keast · 发表于 2008-3-3 09:36:07

20.环境允许的中小城镇居民区，变压器容量在多少时，宜设杆上式或高台式变电所： 
A 630 B <st1:chmetcnv UnitName="C" SourceValue="500" HasSpace="True" Negative="False" NumberType="1" TCSC="0" w:st="on"><st1:chmetcnv UnitName="C" SourceValue="500" HasSpace="False" Negative="False" NumberType="1" TCSC="0" w:st="on">500 </st1:chmetcnv> C</st1:chmetcnv> 200 D 315 
<o:p> </o:p>
<民用电气设计规范(JGJ?T16-92)><st1:chsdate w:st="on" IsROCDate="False" IsLunarDate="False" Day="30" Month="12" Year="1899">4.5.1</st1:chsdate> 配变电所的形式应根据用电负荷的状况和周围环境情况综合确定。<o:p></o:p>
 <st1:chsdate w:st="on" IsROCDate="False" IsLunarDate="False" Day="30" Month="12" Year="1899">4.5.1</st1:chsdate>.1 高层或大型民用建筑内，宜设室内变电所或户内成套变电所。<o:p></o:p>
 <st1:chsdate w:st="on" IsROCDate="False" IsLunarDate="False" Day="30" Month="12" Year="1899">4.5.1</st1:chsdate>.2 大中城市的居民区，宜设独立变电所或内外附变电所，有条件时也可设户外成套变电所。<o:p></o:p>
 <st1:chsdate w:st="on" IsROCDate="False" IsLunarDate="False" Day="30" Month="12" Year="1899">4.5.1</st1:chsdate>.3 环境允许的中小城镇居民区和工厂的生活区，其变压器容量在315kV·A以下时，宜设杆上式和高台式变电所。<o:p></o:p>
<o:p> </o:p>
参考答案：D<o:p></o:p>

keast · 发表于 2008-3-3 09:36:23

21. 低压配电宜用放射式配电的为： 
A用电设备容量较大； B用电负荷性质重要； 
C有特殊要求的车间、建筑物内； D用电设备彼此靠近。 
<o:p> </o:p>
 <供配电系统设计规范（GB50052-95）> 第<st1:chsdate w:st="on" IsROCDate="False" IsLunarDate="False" Day="30" Month="12" Year="1899">6.0.3</st1:chsdate>条当用电设备为大容量，或负荷性质重要，或在有特殊要求的车间、建筑物内，宜采用放射式配电。<o:p></o:p>
<o:p> </o:p>
参考答案：ABC<o:p></o:p>

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