dlt 620-1997.html

电气专业设计规范

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  <p class=MsoNormal align=center style='text-align:center'><span lang=ZH-CN
  style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
  "Times New Roman"'>电流允许值</span></p>
  <p class=MsoNormal align=center style='text-align:center'>A</p>
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  <p class=MsoNormal align=center style='text-align:center'>6.3</p>
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  <p class=MsoNormal align=center style='text-align:center'><span lang=ZH-CN
  style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
  "Times New Roman"'>≤</span>50</p>
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  <td width=108 style='width:81.0pt;border-top:none;border-left:none;
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  <p class=MsoNormal align=center style='text-align:center'>4</p>
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  <p class=MsoNormal align=center style='text-align:center'>13.8<span
  lang=ZH-CN style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
  mso-hansi-font-family:"Times New Roman"'>～</span>15.75</p>
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  <td width=132 style='width:99.0pt;border-top:none;border-left:none;
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  <p class=MsoNormal align=center style='text-align:center'>125<span
  lang=ZH-CN style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
  mso-hansi-font-family:"Times New Roman"'>～</span>200</p>
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  <td width=107 style='width:80.6pt;border-top:none;border-left:none;
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  <p class=MsoNormal align=center style='text-align:center'>2</p>
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  height:11.0pt'>
  <p class=MsoNormal align=center style='text-align:center'>10.5</p>
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  padding:0mm 5.4pt 0mm 5.4pt;height:11.0pt'>
  <p class=MsoNormal align=center style='text-align:center'>50<span lang=ZH-CN
  style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
  "Times New Roman"'>～</span>100</p>
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  <td width=108 style='width:81.0pt;border-top:none;border-left:none;
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  <p class=MsoNormal align=center style='text-align:center'>3</p>
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  <td width=142 style='width:106.4pt;border-top:none;border-left:none;
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  <p class=MsoNormal align=center style='text-align:center'>18<span lang=ZH-CN
  style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
  "Times New Roman"'>～</span>20</p>
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  <td width=132 style='width:99.0pt;border-top:none;border-left:none;
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  <p class=MsoNormal align=center style='text-align:center'><span lang=ZH-CN
  style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
  "Times New Roman"'>≥</span>300</p>
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  <td width=107 style='width:80.6pt;border-top:none;border-left:none;
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  <p class=MsoNormal align=center style='text-align:center'>1</p>
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  height:11.0pt'>
  <p class=MsoNormal><span lang=ZH-CN style='font-family:宋体;mso-ascii-font-family:
  "Times New Roman";mso-hansi-font-family:"Times New Roman";color:fuchsia'>注：对额定电压为</span><span
  style='color:fuchsia'>13.8kV</span><span lang=ZH-CN style='font-family:宋体;
  mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman";
  color:fuchsia'>～</span><span style='color:fuchsia'>15.75kV</span><span
  lang=ZH-CN style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
  mso-hansi-font-family:"Times New Roman";color:fuchsia'>的氢冷发电机为</span><span
  style='color:fuchsia'>2.5A</span><span lang=ZH-CN style='font-family:宋体;
  mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman";
  color:fuchsia'>。</span><span style='color:fuchsia'><o:p></o:p></span></p>
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</table>

<p class=MsoNormal align=center style='text-align:center'>&nbsp;</p>

<p class=MsoNormal><span style='font-family:宋体;mso-hansi-font-family:"Times New Roman"'><span
style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </span></span><span lang=ZH-CN
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>发电机内部发生单相接地故障要求瞬时切机时，宜采用高电阻接地方式。电阻器一般接在发电机中性点变压器的二次绕组上。</span></p>

<p class=MsoNormal>3.1.4<span style='font-family:宋体;mso-hansi-font-family:"Times New Roman"'><span
style="mso-spacerun: yes">&nbsp; </span></span>6kV<span lang=ZH-CN
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>～</span>35kV<span lang=ZH-CN style='font-family:宋体;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>主要由电缆线路构成的送、配电系统，单相接地故障电容电流较大时，可采用低电阻接地方式，但应考虑供电可靠性要求、故障时瞬态电压、瞬态电流对电气设备的影响、对通信的影响和继电保护技术要求以及本地的运行经验等。</span></p>

<p class=MsoNormal>3.1.5<span style='font-family:宋体;mso-hansi-font-family:"Times New Roman"'><span
style="mso-spacerun: yes">&nbsp; </span></span>6kV<span lang=ZH-CN
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>和</span>10kV<span lang=ZH-CN style='font-family:宋体;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>配电系统以及发电厂厂用电系统，单相接地故障电容电流较小时，为防止谐振、间歇性电弧接地过电压等对设备的损害，可采用高电阻接地方式。</span></p>

<p class=MsoNormal>3.1.6<span style='font-family:宋体;mso-hansi-font-family:"Times New Roman"'><span
style="mso-spacerun: yes">&nbsp; </span></span><span lang=ZH-CN
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>消弧线圈的应用</span></p>

<p class=MsoNormal><span style='font-family:宋体;mso-hansi-font-family:"Times New Roman"'><span
style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </span></span>a)<span lang=ZH-CN
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>消弧线圈接地系统，在正常运行情况下，中性点的长时间电压位移不应超过系统标称相电压的</span>15%<span
lang=ZH-CN style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>。</span></p>

<p class=MsoNormal><span style='font-family:宋体;mso-hansi-font-family:"Times New Roman"'><span
style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </span></span>b)<span lang=ZH-CN
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>消弧线圈接地系统故障点的残余电流不宜超过</span>10A<span lang=ZH-CN
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>，必要时可将系统分区运行。消弧线圈宜采用过补偿运行方式。</span></p>

<p class=MsoNormal><span style='font-family:宋体;mso-hansi-font-family:"Times New Roman"'><span
style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </span></span>c)<span lang=ZH-CN
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>消弧线圈的容量应根据系统</span>5<span lang=ZH-CN style='font-family:
宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>～</span>10<span
lang=ZH-CN style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>年的发展规划确定，并应按下式计算：</span></p>

<p class=MsoNormal align=right style='text-align:right'><sub><IMG SRC="./images/imageb-002.gif"></sub><span
style='font-family:宋体;mso-hansi-font-family:"Times New Roman"'><span
style="mso-spacerun:
yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span>(1)<span lang=ZH-CN style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>