dlt 620-1997.html

电气专业设计规范

<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"'>本标准起草单位：电力工业部电力科学研究院高压研究所。</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><span lang=ZH-CN
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>本标准起草人：杜澍春、陈维江。</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><span lang=ZH-CN
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>本标准委托电力工业部电力科学研究院高压研究所负责解释。</span></p>

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

<P class=MsoNormal><A NAME="A2"></A>1<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"'>范围</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><span lang=ZH-CN
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>本标准规定了标称电压为</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>500kV<span
lang=ZH-CN style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>交流系统中电气装置过电压保护的方法和要求；提供了相对地、相间绝缘耐受电压或平均</span>(50%)<span
lang=ZH-CN style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>放电电压的选择程序，并给出了电气设备通常选用的耐受电压和架空送电线路与高压配电装置的绝缘子、空气间隙的推荐值。</span></p>

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

<P class=MsoNormal><A NAME="A3"></A>2<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"'>定义</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><span lang=ZH-CN
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>本标准采用下列定义。</span></p>

<p class=MsoNormal>2.1<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"'>电阻接地系统</span>Resistance<span style='font-family:宋体;
mso-hansi-font-family:"Times New Roman"'> </span>grounded<span
style='font-family:宋体;mso-hansi-font-family:"Times New Roman"'> </span>system</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"'>系统中至少有一根导线或一点</span>(<span lang=ZH-CN style='font-family:
宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>通常是变压器或发电机的中性线或中性点</span>)<span
lang=ZH-CN style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>经过电阻接地。</span></p>

<p class=MsoNormal><span style='font-family:宋体;mso-hansi-font-family:"Times New Roman";
color:fuchsia'><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";color:fuchsia'>注</span><span
style='color:fuchsia'><o:p></o:p></span></p>

<p class=MsoNormal><span style='font-family:宋体;mso-hansi-font-family:"Times New Roman";
color:fuchsia'><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </span></span><span
style='color:fuchsia'>1</span><span style='font-family:宋体;mso-hansi-font-family:
"Times New Roman";color:fuchsia'><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:fuchsia'>高电阻接地的系统设计应符合</span><i
style='mso-bidi-font-style:normal'><span style='color:fuchsia'>R</span></i><sub><span
style='color:fuchsia'>0</span></sub><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><i style='mso-bidi-font-style:normal'><span
style='color:fuchsia'>X</span></i><sub><span style='color:fuchsia'>C0</span></sub><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'>的准则，以限制由于电弧接地故障产生的瞬态过电压。一般采用接地故障电流小于</span><span
style='color:fuchsia'>10A</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><i style='mso-bidi-font-style:normal'><span
style='color:fuchsia'>R</span></i><sub><span style='color:fuchsia'>0</span></sub><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'>是系统等值零序电阻，</span><i
style='mso-bidi-font-style:normal'><span style='color:fuchsia'>X</span></i><sub><span
style='color:fuchsia'>C0</span></sub><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'>是系统每相的对地分布容抗。</span><span style='color:fuchsia'><o:p></o:p></span></p>

<p class=MsoNormal><span style='font-family:宋体;mso-hansi-font-family:"Times New Roman";
color:fuchsia'><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </span></span><span
style='color:fuchsia'>2</span><span style='font-family:宋体;mso-hansi-font-family:
"Times New Roman";color:fuchsia'><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:fuchsia'>低电阻接地的系统为获得快速选择性继电保护所需的足够电流，一般采用接地故障电流为</span><span
style='color:fuchsia'>100A</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'>1000A</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'>。对于一般系统，限制瞬态过电压的准则是</span><span
style='color:fuchsia'>(<i style='mso-bidi-font-style:normal'>R</i><sub>0</sub></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><i
style='mso-bidi-font-style:normal'><span style='color:fuchsia'>X</span></i><sub><span
style='color:fuchsia'>0</span></sub><span style='color:fuchsia'>)</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'>2</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'>。其中</span><i style='mso-bidi-font-style:normal'><span
style='color:fuchsia'>X</span></i><sub><span style='color:fuchsia'>0</span></sub><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'>是系统等值零序感抗。</span><span
style='color:fuchsia'><o:p></o:p></span></p>

<p class=MsoNormal>2.2<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"'>少雷区</span>less<span style='font-family:宋体;mso-hansi-font-family:
"Times New Roman"'> </span>thunderstorm<span 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"'>平均年雷暴日数不超过</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"'>的地区。</span></p>

<p class=MsoNormal>2.3<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"'>中雷区</span>middle<span style='font-family:宋体;mso-hansi-font-family:
"Times New Roman"'> </span>thunderstorm<span 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>15<span lang=ZH-CN style='font-family:宋体;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>但不超过</span>40<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。</span></p>

<p class=MsoNormal>2.4<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"'>多雷区</span>more<span style='font-family:宋体;mso-hansi-font-family:
"Times New Roman"'> </span>thunderstorm<span 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>40<span lang=ZH-CN style='font-family:宋体;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>但不超过</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。</span></p>

<p class=MsoNormal>2.5<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"'>雷电活动特殊强烈地区</span>Thunderstorm<span style='font-family:宋体;
mso-hansi-font-family:"Times New Roman"'> </span>activity<span
style='font-family:宋体;mso-hansi-font-family:"Times New Roman"'> </span>special<span
style='font-family:宋体;mso-hansi-font-family:"Times New Roman"'> </span>strong<span