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回复:重磅推出:全国注册电气案例题真题披露及解答过程
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; LAYOUT-GRID-MODE: char; mso-layout-grid-align: none">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></P>
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<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0">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></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><o:p> </o:p></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt">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></P>
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<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt">整流电路接线方式<o:p></o:p></P></TD>
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<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt">整流电路相数<I>p</I><o:p></o:p></P></TD>
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<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center" align=center><B><I>I<SUB>n</SUB>/I<SUB>1</SUB></I></B><o:p></o:p></P></TD>
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<TR style="HEIGHT: 7pt; mso-yfti-irow: 1; page-break-inside: avoid">
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<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></P></TD>
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<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center" align=center>5<o:p></o:p></P></TD>
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<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center" align=center>7<o:p></o:p></P></TD>
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<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center" align=center>11<o:p></o:p></P></TD>
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<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center" align=center>13<o:p></o:p></P></TD>
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<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center" align=center>17<o:p></o:p></P></TD>
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<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center" align=center>19<o:p></o:p></P></TD>
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<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></P></TD>
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<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center" align=center>25<o:p></o:p></P></TD></TR>
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<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt">三相桥式整流<o:p></o:p></P></TD>
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<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></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>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center" align=center>100<o:p></o:p></P></TD>
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<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center" align=center>20<o:p></o:p></P></TD>
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<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center" align=center>14<o:p></o:p></P></TD>
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<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center" align=center>9.1<o:p></o:p></P></TD>
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<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center" align=center>7.7<o:p></o:p></P></TD>
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<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center" align=center>5.9<o:p></o:p></P></TD>
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<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center" align=center>5.3<o:p></o:p></P></TD>
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<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center" align=center>4.3<o:p></o:p></P></TD>
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<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center" align=center>4<o:p></o:p></P></TD>
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<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center" align=center>28.9<o:p></o:p></P></TD>
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<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center" align=center>104.1<o:p></o:p></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>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center" align=center>12<o:p></o:p></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>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center" align=center>100<o:p></o:p></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>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center" align=center>0<o:p></o:p></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>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center" align=center>0<o:p></o:p></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>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center" align=center>9.1<o:p></o:p></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>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center" align=center>7.7<o:p></o:p></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>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center" align=center>0<o:p></o:p></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>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center" align=center>0<o:p></o:p></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>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center" align=center>4.3<o:p></o:p></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>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center" align=center>4<o:p></o:p></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></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>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center" align=center>100.9<o:p></o:p></P></TD></TR></TABLE>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><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"><FONT size=3></FONT></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></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><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></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; LAYOUT-GRID-MODE: char; mso-layout-grid-align: none"><B><o:p> </o:p></B></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; LAYOUT-GRID-MODE: char; mso-layout-grid-align: none">基波电流方均根值I1=I5*N=75A<o:p></o:p></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; LAYOUT-GRID-MODE: char; mso-layout-grid-align: none">7次谐波电流方均根值I7=I1/7=12.1A<o:p></o:p></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; LAYOUT-GRID-MODE: char; mso-layout-grid-align: none"><o:p> </o:p></P> |
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