dlt 620-1997.html

电气专业设计规范

style='font-family:宋体;mso-hansi-font-family:"Times New Roman"'> </span>region</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"'>平均年雷暴日数超过</span>90<span lang=ZH-CN style='font-family:宋体;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>的地区及根据运行经验雷害特殊严重的地区。</span></p>

<p class=MsoNormal>&nbsp;</p>

<P class=MsoNormal><A NAME="A4"></A>3<span style='font-family:宋体;mso-hansi-font-family:"Times New Roman"'><span
style="mso-spacerun: yes"> </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"'>系统接地方式和运行中出现的各种电压</span></P>

<p class=MsoNormal>3.1<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"'>系统接地方式</span></p>

<p class=MsoNormal>3.1.1<span style='font-family:宋体;mso-hansi-font-family:"Times New Roman"'><span
style="mso-spacerun: yes">&nbsp; </span></span>110kV<span lang=ZH-CN
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>～</span>500kV<span lang=ZH-CN style='font-family:宋体;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>系统应该采用有效接地方式，即系统在各种条件下应该使零序与正序电抗之比</span>(<i
style='mso-bidi-font-style:normal'>X</i><sub>0</sub>/<i style='mso-bidi-font-style:
normal'>X</i><sub>1</sub>)<span lang=ZH-CN style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>为正值并且不大于</span>3<span
lang=ZH-CN style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>，而其零序电阻与正序电抗之比</span>(<i
style='mso-bidi-font-style:normal'>R</i><sub>0</sub>/<i style='mso-bidi-font-style:
normal'>X</i><sub>1</sub>)<span lang=ZH-CN style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>为正值并且不大于</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"'>。</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>110kV<span
lang=ZH-CN style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>及</span>220kV<span lang=ZH-CN
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>系统中变压器中性点直接或经低阻抗接地，部分变压器中性点也可不接地。</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>330kV<span
lang=ZH-CN style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>及</span>500kV<span lang=ZH-CN
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>系统中不允许变压器中性点不接地运行。</span></p>

<p class=MsoNormal>3.1.2<span style='font-family:宋体;mso-hansi-font-family:"Times New Roman"'><span
style="mso-spacerun: yes">&nbsp; </span></span>3kV<span lang=ZH-CN
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>～</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"'>不直接连接发电机的系统和</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"'>、</span>66kV<span lang=ZH-CN
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>系统，当单相接地故障电容电流不超过下列数值时，应采用不接地方式；当超过下列数值又需在接地故障条件下运行时，应采用消弧线圈接地方式：</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>a)3kV<span
lang=ZH-CN style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>～</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"'>钢筋混凝土或金属杆塔的架空线路构成的系统和所有</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"'>、</span>66kV<span lang=ZH-CN style='font-family:宋体;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>系统，</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"'>。</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)3kV<span
lang=ZH-CN style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>～</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"'>非钢筋混凝土或非金属杆塔的架空线路构成的系统，当电压为：</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>1)3kV<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>6kV<span lang=ZH-CN
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>时，</span>30A<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>2)10kV<span
lang=ZH-CN style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>时，</span>20A<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>c)3kV<span
lang=ZH-CN style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>～</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"'>电缆线路构成的系统，</span>30A<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>3.1.3<span style='font-family:宋体;mso-hansi-font-family:"Times New Roman"'><span
style="mso-spacerun: yes">&nbsp; </span></span>3kV<span lang=ZH-CN
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>～</span>20kV<span lang=ZH-CN style='font-family:宋体;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>具有发电机的系统，发电机内部发生单相接地故障不要求瞬时切机时，如单相接地故障电容电流不大于表</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"'>所示允许值时，应采用不接地方式；大</span>DL/T<span
style='font-family:宋体;mso-hansi-font-family:"Times New Roman"'> </span>620<span
lang=ZH-CN style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>—</span>1997<span lang=ZH-CN
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>于该允许值时，应采用消弧线圈接地方式，且故障点残余电流也不得大于该允许值。消弧线圈可装在厂用变压器中性点上，也可装在发电机中性点上。</span></p>

<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";color:red'>表</span><span style='color:red'>1</span><span
style='font-family:宋体;mso-hansi-font-family:"Times New Roman";color:red'><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";color:red'>发电机接地故障电流允许值</span><span style='color:red'><o:p></o:p></span></p>

<table border=1 cellspacing=0 cellpadding=0 style='border-collapse:collapse;
 border:none;mso-border-alt:solid windowtext .5pt;mso-padding-alt:0mm 5.4pt 0mm 5.4pt'>
 <tr style='height:11.0pt'>
  <td width=127 style='width:95.4pt;border:solid windowtext .5pt;padding:0mm 5.4pt 0mm 5.4pt;
  height:11.0pt'>
  <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"'>发电机额定电压</span></p>
  <p class=MsoNormal align=center style='text-align:center'>kV</p>
  </td>
  <td width=132 style='width:99.0pt;border:solid windowtext .5pt;border-left:
  none;mso-border-left-alt:solid windowtext .5pt;padding:0mm 5.4pt 0mm 5.4pt;
  height:11.0pt'>
  <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"'>发电机额定容量</span></p>
  <p class=MsoNormal align=center style='text-align:center'>MW</p>
  </td>
  <td width=108 style='width:81.0pt;border:solid windowtext .5pt;border-left:
  none;mso-border-left-alt:solid windowtext .5pt;padding:0mm 5.4pt 0mm 5.4pt;
  height:11.0pt'>
  <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>
  </td>
  <td width=142 style='width:106.4pt;border:solid windowtext .5pt;border-left:
  none;mso-border-left-alt:solid windowtext .5pt;padding:0mm 5.4pt 0mm 5.4pt;
  height:11.0pt'>
  <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"'>发电机额定电压</span></p>
  <p class=MsoNormal align=center style='text-align:center'>kV</p>
  </td>
  <td width=132 style='width:99.0pt;border:solid windowtext .5pt;border-left:
  none;mso-border-left-alt:solid windowtext .5pt;padding:0mm 5.4pt 0mm 5.4pt;
  height:11.0pt'>
  <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"'>发电机额定容量</span></p>
  <p class=MsoNormal align=center style='text-align:center'>MW</p>
  </td>
  <td width=107 style='width:80.6pt;border:solid windowtext .5pt;border-left: