首页 › 防雷技术标准/政策/法规 › [转帖]《建筑物防雷设计规范》GB50057-94 2000 年局部修订 6.4

asp 发表于 2002-11-4 15:47:00

[转帖]《建筑物防雷设计规范》GB50057-94 2000 年局部修订 6.4

[这个贴子最后由ASP在 2003/04/29 11:41am 第 1 次编辑]<br><br>&lt;p align=&quot;center&quot;&gt;&lt;font size=&quot;3&quot;&gt;中华人民共和国国家标准 &lt;br&gt;&lt;br&gt;《建筑物防雷设计规范》GB50057-94 &lt;br&gt;&lt;br&gt;局部修订条文 &lt;/font&gt;&lt;/p&gt;&lt;table&gt;&lt;tr&gt;&lt;td&gt;&lt;p align=&quot;center&quot;&gt;&lt;font size=&quot;3&quot;&gt;工程建设标准局部修订公告 &lt;br&gt;&lt;/font&gt;&lt;font size=&quot;2&quot;&gt;&lt;br&gt;第24号 &lt;br&gt;&lt;br&gt;国家标准《建筑物防雷设计规范》GB50057-94，由国家机械工业局设计研究院会同有关单位进行了局部修订，已经有关部门会审，现批准局部修订的条文，自2000 年10月1日起施行，原规范中相应的条文同时废止。现予公告。 &lt;br&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;br&gt;&lt;/font&gt;&lt;font size=&quot;3&quot;&gt;中华人民共和国建设部 &lt;br&gt;　2000年8月24日&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;&lt;/table&gt;&lt;p align=&quot;left&quot;&gt;&lt;font size=&quot;2&quot;&gt;第四节 &nbsp;对电涌保护器和其它的要求 &lt;br&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;br&gt;第6.4.1条 &nbsp;当电源采用TN系统时，从建筑物内总配电盘（箱）开始引出的配电线路和分支线路必须采用TN-S系统。&lt;br&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 　　第6.4.2条 &nbsp;本章原则上规定要在各防雷区界面处做等电位连接，但由于工艺要求或其它原因，被保护设备的安装位置不会正好设在界面处而是设在其附近，在这种情况下，当线路能承受所发生的电涌电压时，电涌保护器可安装在被保护设备处，而线路的金属保护层或屏蔽层宜首先于界面处做一次等电位连接。&lt;br&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 　　第6.4.3条 &nbsp;在屏蔽线路从室外的 LPZ0A 或 LPZ0B 区进入 LPZ1 区的情况下，线路屏蔽层的截面 SC 应符合下式规定：&lt;br&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &lt;br&gt;　　　　　　SC ≥ iiρclc106/Ub（mm2） 　　　　　　（6.4.3-1）&lt;br&gt;&lt;br&gt;式中：ii──流入屏蔽层的雷电流（kA），按图6.3.4-1确定；&lt;br&gt;　　　　ρc──屏蔽层的电阻率(Ω·m)，20℃时铁为138×10-9Ω·m，铜为17.24×10-9Ω·m，铝为28.264×10-9Ω·m。&lt;br&gt;　　　　lc ──线路长度（m），按表6.4.3-1确定；&lt;br&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 　　　　Ub ──线路绝缘的耐冲击电压值（kV），电力线路按表6.4.3-2确定；通信线路，纸绝缘为1.5kV，塑料绝缘为5kV。&lt;br&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &lt;/font&gt;&lt;font face=&quot;宋体&quot; size=&quot;2&quot;&gt;&lt;b&gt;&lt;span lang=&quot;EN-US&quot;&gt; &lt;/O:P&gt; &nbsp; &nbsp;&lt;/span&gt;&lt;/b&gt;&lt;/font&gt;&lt;p align=&quot;center&quot;&gt;&lt;b&gt;&lt;font face=&quot;宋体&quot; size=&quot;2&quot;&gt;&lt;span&gt;按屏蔽层敷设条件确定的线路长度&lt;/span&gt;&lt;span lang=&quot;EN-US&quot; style=&quot;mso-spacerun: yes&quot;&gt; &nbsp; &nbsp; &nbsp; &lt;/span&gt;&lt;/font&gt;&lt;/b&gt;&lt;font face=&quot;宋体&quot; size=&quot;2&quot;&gt;&lt;b&gt;&lt;span&gt;表&lt;/span&gt;&lt;span lang=&quot;EN-US&quot;&gt;6.4.3-1&lt;O:P&gt;&lt;/span&gt;&lt;/b&gt;&lt;/font&gt;&lt;span lang=&quot;EN-US&quot;&gt;&lt;font face=&quot;宋体&quot; size=&quot;2&quot;&gt; &nbsp; &lt;/O:P&gt;&lt;/font&gt;&lt;/span&gt;&lt;/p&gt;&lt;center&gt;&lt;table&gt; &nbsp;&lt;col width=&quot;262&quot; style=&quot;mso-width-source:userset&#59;mso-width-alt:8384&#59;width:197pt&quot;&gt; &nbsp;&lt;col width=&quot;265&quot; style=&quot;mso-width-source:userset&#59;mso-width-alt:8480&#59;width:199pt&quot;&gt; &nbsp;&lt;tr height=&quot;20&quot; style=&quot;height:15.0pt&quot;&gt; &nbsp; &nbsp;&lt;td height=&quot;20&quot; class=&quot;xl30&quot; width=&quot;262&quot; style=&quot;height:15.0pt&#59;width:197pt&quot;&gt;&lt;font size=&quot;2&quot;&gt;屏蔽层敷设条件&lt;/font&gt;&lt;/td&gt; &nbsp; &nbsp;&lt;td class=&quot;xl31&quot; width=&quot;265&quot; style=&quot;width:199pt&quot;&gt;&lt;font size=&quot;2&quot;&gt;lc（m）&lt;/font&gt;&lt;/td&gt; &nbsp;&lt;/tr&gt; &nbsp;&lt;tr height=&quot;19&quot; style=&quot;height:14.25pt&quot;&gt; &nbsp; &nbsp;&lt;td height=&quot;19&quot; class=&quot;xl33&quot; width=&quot;262&quot; style=&quot;height:14.25pt&#59;width:197pt&quot;&gt;&lt;font size=&quot;2&quot;&gt;√ρ&lt;/font&gt;&lt;/td&gt; &nbsp; &nbsp;&lt;td class=&quot;xl25&quot; width=&quot;265&quot; style=&quot;width:199pt&quot;&gt;&lt;font size=&quot;2&quot;&gt;当实际长度＞8√ρ &nbsp; &nbsp; &nbsp; 时&lt;/font&gt;&lt;/td&gt; &nbsp;&lt;/tr&gt; &nbsp;&lt;tr height=&quot;19&quot; style=&quot;height:14.25pt&quot;&gt; &nbsp; &nbsp;&lt;td height=&quot;19&quot; class=&quot;xl33&quot; width=&quot;262&quot; style=&quot;height:14.25pt&#59;width:197pt&quot;&gt;&lt;/td&gt; &nbsp; &nbsp;&lt;td class=&quot;xl25&quot; width=&quot;265&quot; style=&quot;width:199pt&quot; x:str=&quot;取lc = 8√ρ ； &quot;&gt;&lt;font size=&quot;2&quot;&gt;取lc &nbsp; &nbsp; &nbsp; = 8√ρ ；&lt;span style=&quot;mso-spacerun: yes&quot;&gt; &lt;/span&gt;&lt;/font&gt;&lt;/td&gt; &nbsp;&lt;/tr&gt; &nbsp;&lt;tr height=&quot;19&quot; style=&quot;height:14.25pt&quot;&gt; &nbsp; &nbsp;&lt;td height=&quot;19&quot; class=&quot;xl33&quot; width=&quot;262&quot; style=&quot;height:14.25pt&#59;width:197pt&quot;&gt;&lt;/td&gt; &nbsp; &nbsp;&lt;td class=&quot;xl25&quot; width=&quot;265&quot; style=&quot;width:199pt&quot;&gt;&lt;font size=&quot;2&quot;&gt;当实际长度＜8√ρ &nbsp; &nbsp; &nbsp; 时&lt;/font&gt;&lt;/td&gt; &nbsp;&lt;/tr&gt; &nbsp;&lt;tr height=&quot;19&quot; style=&quot;height:14.25pt&quot;&gt; &nbsp; &nbsp;&lt;td height=&quot;19&quot; class=&quot;xl33&quot; width=&quot;262&quot; style=&quot;height:14.25pt&#59;width:197pt&quot;&gt;&lt;/td&gt; &nbsp; &nbsp;&lt;td class=&quot;xl25&quot; width=&quot;265&quot; style=&quot;width:199pt&quot;&gt;&lt;font size=&quot;2&quot;&gt;取lc = &nbsp; &nbsp; &nbsp; 线路实际长度&lt;/font&gt;&lt;/td&gt; &nbsp;&lt;/tr&gt; &nbsp;&lt;tr height=&quot;33&quot; style=&quot;mso-height-source:userset&#59;height:24.75pt&quot;&gt; &nbsp; &nbsp;&lt;td height=&quot;33&quot; class=&quot;xl32&quot; width=&quot;527&quot; style=&quot;height: 24.75pt&quot; colspan=&quot;2&quot;&gt;&lt;font size=&quot;2&quot;&gt;屏蔽层与电阻率ρ（Ω·m）的土壤直接接触　&lt;/font&gt;&lt;/td&gt; &nbsp;&lt;/tr&gt; &nbsp;&lt;tr height=&quot;19&quot; style=&quot;height:14.25pt&quot;&gt; &nbsp; &nbsp;&lt;td height=&quot;19&quot; class=&quot;xl34&quot; width=&quot;262&quot; style=&quot;height:14.25pt&#59;border-top:none&#59; &nbsp;width:197pt&quot;&gt;&lt;font size=&quot;2&quot;&gt;屏蔽层与土壤隔离或敷设在大气中&lt;/font&gt;&lt;/td&gt; &nbsp; &nbsp;&lt;td class=&quot;xl27&quot; width=&quot;265&quot; style=&quot;width:199pt&quot;&gt;&lt;font size=&quot;2&quot;&gt;lc = &nbsp; &nbsp; &nbsp; 建筑物与屏蔽层最近接地之间的距离&lt;span style=&quot;mso-spacerun: yes&quot;&gt; &nbsp;&lt;/span&gt;&lt;/font&gt;&lt;/td&gt; &nbsp;&lt;/tr&gt;&lt;/table&gt;&lt;/center&gt;&lt;p align=&quot;center&quot; style=&quot;LAYOUT-GRID-MODE: char&#59; LINE-HEIGHT: 110%&quot;&gt;&lt;b&gt;&lt;font face=&quot;宋体&quot; size=&quot;2&quot;&gt;&lt;span&gt;电缆绝缘的耐冲击电压值&lt;/span&gt;&lt;span lang=&quot;EN-US&quot; style=&quot;mso-spacerun: yes&quot;&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &lt;/span&gt;&lt;span&gt;表&lt;/span&gt;&lt;span lang=&quot;EN-US&quot;&gt;6.4.3-2&lt;O:P&gt; &lt;/O:P&gt; &nbsp; &nbsp; &nbsp;&lt;/span&gt;&lt;/font&gt;&lt;/b&gt;&lt;/p&gt;&lt;div align=&quot;center&quot;&gt; &nbsp;&lt;table border=&quot;1&quot; cellPadding=&quot;0&quot; cellSpacing=&quot;0&quot; &gt; &nbsp; &nbsp;&lt;tbody&gt; &nbsp; &nbsp; &nbsp;&lt;tr style=&quot;HEIGHT: 20pt&#59; mso-height-rule: exactly&quot;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&lt;td style=&quot;BORDER-BOTTOM: windowtext 1pt solid&#59; BORDER-LEFT: medium none&#59; BORDER-RIGHT: windowtext 1pt solid&#59; BORDER-TOP: windowtext 1pt solid&#59; 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style=&quot;LAYOUT-GRID-MODE: char&#59; LINE-HEIGHT: 110%&quot;&gt;&lt;font face=&quot;宋体&quot; size=&quot;2&quot;&gt;&lt;span&gt;绝缘的耐冲击电压&lt;/span&gt;&lt;span lang=&quot;EN-US&quot;&gt;&lt;i&gt;U&lt;/i&gt;&lt;sub&gt;b&lt;/sub&gt;&lt;/span&gt;&lt;span&gt;（&lt;/span&gt;&lt;span lang=&quot;EN-US&quot;&gt;kV&lt;/span&gt;&lt;span&gt;）&lt;/span&gt;&lt;/font&gt;&lt;/p&gt; &nbsp; &nbsp; &nbsp; &nbsp;&lt;/td&gt; &nbsp; &nbsp; &nbsp;&lt;/tr&gt; &nbsp; &nbsp; &nbsp;&lt;tr style=&quot;HEIGHT: 20pt&#59; mso-height-rule: exactly&quot;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&lt;td style=&quot;BORDER-BOTTOM: windowtext 1pt solid&#59; BORDER-LEFT: medium none&#59; BORDER-RIGHT: windowtext 1pt solid&#59; BORDER-TOP: medium none&#59; HEIGHT: 20pt&#59; PADDING-BOTTOM: 0cm&#59; PADDING-LEFT: 5.4pt&#59; PADDING-RIGHT: 5.4pt&#59; PADDING-TOP: 0cm&#59; WIDTH: 6cm&#59; mso-border-top-alt: solid windowtext 1.0pt&#59; mso-height-rule: exactly&quot; width=&quot;227&quot;&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;p align=&quot;center&quot; 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BORDER-LEFT: medium none&#59; BORDER-RIGHT: medium none&#59; BORDER-TOP: medium none&#59; HEIGHT: 20pt&#59; PADDING-BOTTOM: 0cm&#59; PADDING-LEFT: 5.4pt&#59; PADDING-RIGHT: 5.4pt&#59; PADDING-TOP: 0cm&#59; WIDTH: 6cm&#59; mso-border-left-alt: solid windowtext 1.0pt&#59; mso-border-top-alt: solid windowtext 1.0pt&#59; mso-height-rule: exactly&quot; width=&quot;227&quot;&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;p align=&quot;center&quot; style=&quot;LAYOUT-GRID-MODE: char&#59; LINE-HEIGHT: 110%&quot;&gt;&lt;span lang=&quot;EN-US&quot;&gt;&lt;font face=&quot;宋体&quot; size=&quot;2&quot;&gt;95&lt;/font&gt;&lt;/span&gt;&lt;/p&gt; &nbsp; &nbsp; &nbsp; &nbsp;&lt;/td&gt; &nbsp; &nbsp; &nbsp;&lt;/tr&gt; &nbsp; &nbsp; &nbsp;&lt;tr style=&quot;HEIGHT: 20pt&#59; mso-height-rule: exactly&quot;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&lt;td style=&quot;BORDER-BOTTOM: windowtext 1pt solid&#59; BORDER-LEFT: medium none&#59; BORDER-RIGHT: windowtext 1pt solid&#59; BORDER-TOP: medium none&#59; HEIGHT: 20pt&#59; 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&nbsp;&lt;p align=&quot;center&quot; style=&quot;LAYOUT-GRID-MODE: char&#59; LINE-HEIGHT: 110%&quot;&gt;&lt;span lang=&quot;EN-US&quot;&gt;&lt;font face=&quot;宋体&quot; size=&quot;2&quot;&gt;125&lt;/font&gt;&lt;/span&gt;&lt;/p&gt; &nbsp; &nbsp; &nbsp; &nbsp;&lt;/td&gt; &nbsp; &nbsp; &nbsp;&lt;/tr&gt; &nbsp; &nbsp;&lt;/tbody&gt; &nbsp;&lt;/table&gt;&lt;/div&gt;&lt;p align=&quot;left&quot;&gt;&lt;font size=&quot;2&quot;&gt;注：当流入线路的雷电流大于以下数值时，绝缘可能产生不可接受的温升；&lt;br&gt;　　对屏蔽线路 Ii = 8Sc；&lt;br&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;　　对无屏蔽的线路 I＇i = 8n＇S＇c&lt;br&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;　　式中 &nbsp;Ii──流入屏蔽层的雷电流（kA）；&lt;br&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;　　　　　Sc──屏蔽层的截面（mm2）；&lt;br&gt;　　　　　I＇i ──流入无屏蔽线路的总雷电流（kA）；&lt;br&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;　　　　　n＇ ──线路导线的根数；&lt;br&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;　　　　　S＇c ──每根导线的截面（mm2）。 &lt;br&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &lt;br&gt;第6.4.4条 &nbsp;电涌保护器必须能承受预期通过它们的雷电流，并应符合以下两个附加要求：通过电涌时的最大箝压，有能力熄灭在雷电流通过后产生的工频续流。&lt;br&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;　　在建筑物进线处和其它防雷区界面处的最大电涌电压，即电涌保护器的最大箝压加上其两端引线的感应电压应与所属系统的基本绝缘水平和设备允许的最大电涌电压协调一致。为使最大电涌电压足够低，其两端的引线应做到最短。&lt;br&gt;　　在不同界面上的各电涌保护器还应与其相应的能量承受能力相一致。&lt;br&gt;　　当无法获得设备的耐冲击电压时 220/380V 三相配电系统的设备可按表6.4.4选用。 &lt;br&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &lt;br&gt;&lt;/font&gt;&lt;p align=&quot;center&quot; style=&quot;LINE-HEIGHT: 110%&#59; TEXT-INDENT: 21pt&quot;&gt;&lt;b&gt;&lt;span lang=&quot;EN-US&quot;&gt;&lt;font face=&quot;宋体&quot; size=&quot;2&quot;&gt;220/380V&lt;/font&gt;&lt;/span&gt;&lt;font face=&quot;宋体&quot; size=&quot;2&quot;&gt;&lt;span&gt;三相系统各种设备耐冲击过电压额定值&lt;/span&gt;&lt;span lang=&quot;EN-US&quot; style=&quot;mso-spacerun: yes&quot;&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;/span&gt;&lt;span&gt;表&lt;/span&gt;&lt;span lang=&quot;EN-US&quot;&gt;6.4.4&lt;O:P&gt; &lt;/O:P&gt; &nbsp; &nbsp; &nbsp;&lt;/span&gt;&lt;/font&gt;&lt;/b&gt;&lt;/p&gt;&lt;div align=&quot;center&quot;&gt; &nbsp;&lt;table border=&quot;1&quot; cellPadding=&quot;0&quot; cellSpacing=&quot;0&quot; style=&quot;BORDER-BOTTOM: medium none&#59; BORDER-COLLAPSE: collapse&#59; BORDER-LEFT: medium none&#59; BORDER-RIGHT: medium none&#59; BORDER-TOP: medium none&#59; mso-table-layout-alt: fixed&#59; mso-padding-alt: 0cm 5.4pt 0cm 5.4pt&#59; mso-border-top-alt: solid windowtext 1.0pt&#59; mso-border-bottom-alt: solid windowtext 1.0pt&quot; width=&quot;624&quot;&gt; &nbsp; &nbsp;&lt;tbody&gt; &nbsp; &nbsp; &nbsp;&lt;tr style=&quot;HEIGHT: 20pt&quot;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&lt;td style=&quot;BORDER-BOTTOM: windowtext 1pt solid&#59; BORDER-LEFT: medium none&#59; BORDER-RIGHT: windowtext 1pt solid&#59; BORDER-TOP: windowtext 1pt solid&#59; HEIGHT: 20pt&#59; PADDING-BOTTOM: 0cm&#59; PADDING-LEFT: 5.4pt&#59; PADDING-RIGHT: 5.4pt&#59; PADDING-TOP: 0cm&quot; width=&quot;110&quot;&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;p align=&quot;center&quot; style=&quot;LINE-HEIGHT: 110%&quot;&gt;&lt;font face=&quot;宋体&quot; size=&quot;2&quot;&gt;&lt;span style=&quot;mso-bidi-font-size: 10.0pt&#59; mso-ascii-font-family: Times New Roman&#59; mso-hansi-font-family: Times New Roman&quot;&gt;设备的位置&lt;/span&gt;&lt;span lang=&quot;EN-US&quot; style=&quot;mso-bidi-font-size: 10.0pt&quot;&gt;&lt;O:P&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;/O:P&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;/span&gt;&lt;/font&gt;&lt;/p&gt; &nbsp; &nbsp; &nbsp; &nbsp;&lt;/td&gt; &nbsp; &nbsp; &nbsp; &nbsp;&lt;td style=&quot;BORDER-BOTTOM: windowtext 1pt solid&#59; BORDER-LEFT: medium none&#59; BORDER-RIGHT: windowtext 1pt solid&#59; BORDER-TOP: windowtext 1pt solid&#59; HEIGHT: 20pt&#59; PADDING-BOTTOM: 0cm&#59; PADDING-LEFT: 5.4pt&#59; PADDING-RIGHT: 5.4pt&#59; PADDING-TOP: 0cm&#59; mso-border-left-alt: solid windowtext 1.0pt&quot; width=&quot;110&quot;&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;p align=&quot;center&quot; style=&quot;LINE-HEIGHT: 110%&quot;&gt;&lt;font face=&quot;宋体&quot; size=&quot;2&quot;&gt;&lt;span style=&quot;mso-bidi-font-size: 10.0pt&#59; mso-ascii-font-family: Times New Roman&#59; mso-hansi-font-family: Times New Roman&quot;&gt;电源处的设备&lt;/span&gt;&lt;span lang=&quot;EN-US&quot; style=&quot;mso-bidi-font-size: 10.0pt&quot;&gt;&lt;O:P&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;/O:P&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;/span&gt;&lt;/font&gt;&lt;/p&gt; &nbsp; &nbsp; &nbsp; &nbsp;&lt;/td&gt; &nbsp; &nbsp; &nbsp; &nbsp;&lt;td style=&quot;BORDER-BOTTOM: windowtext 1pt solid&#59; BORDER-LEFT: medium none&#59; BORDER-RIGHT: windowtext 1pt solid&#59; BORDER-TOP: windowtext 1pt solid&#59; HEIGHT: 20pt&#59; PADDING-BOTTOM: 0cm&#59; PADDING-LEFT: 5.4pt&#59; PADDING-RIGHT: 5.4pt&#59; PADDING-TOP: 0cm&#59; mso-border-left-alt: solid windowtext 1.0pt&quot; width=&quot;110&quot;&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;p align=&quot;center&quot; style=&quot;LINE-HEIGHT: 110%&quot;&gt;&lt;font face=&quot;宋体&quot; size=&quot;2&quot;&gt;&lt;span style=&quot;mso-bidi-font-size: 10.0pt&#59; mso-ascii-font-family: Times New Roman&#59; mso-hansi-font-family: Times New Roman&quot;&gt;配电线路和最后分支线路的设备&lt;/span&gt;&lt;span lang=&quot;EN-US&quot; style=&quot;mso-bidi-font-size: 10.0pt&quot;&gt;&lt;O:P&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;/O:P&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;/span&gt;&lt;/font&gt;&lt;/p&gt; &nbsp; &nbsp; &nbsp; &nbsp;&lt;/td&gt; &nbsp; &nbsp; &nbsp; &nbsp;&lt;td style=&quot;BORDER-BOTTOM: windowtext 1pt solid&#59; BORDER-LEFT: medium none&#59; BORDER-RIGHT: windowtext 1pt solid&#59; BORDER-TOP: windowtext 1pt solid&#59; HEIGHT: 20pt&#59; PADDING-BOTTOM: 0cm&#59; PADDING-LEFT: 5.4pt&#59; PADDING-RIGHT: 5.4pt&#59; PADDING-TOP: 0cm&#59; mso-border-left-alt: solid windowtext 1.0pt&quot; width=&quot;94&quot;&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;p align=&quot;center&quot; style=&quot;LINE-HEIGHT: 110%&quot;&gt;&lt;font face=&quot;宋体&quot; size=&quot;2&quot;&gt;&lt;span style=&quot;mso-bidi-font-size: 10.0pt&#59; mso-ascii-font-family: Times New Roman&#59; mso-hansi-font-family: Times New Roman&quot;&gt;用电设备&lt;/span&gt;&lt;span lang=&quot;EN-US&quot; style=&quot;mso-bidi-font-size: 10.0pt&quot;&gt;&lt;O:P&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;/O:P&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;/span&gt;&lt;/font&gt;&lt;/p&gt; &nbsp; &nbsp; &nbsp; &nbsp;&lt;/td&gt; &nbsp; &nbsp; &nbsp; &nbsp;&lt;td style=&quot;BORDER-BOTTOM: windowtext 1pt solid&#59; BORDER-LEFT: medium none&#59; BORDER-RIGHT: medium none&#59; BORDER-TOP: windowtext 1pt solid&#59; HEIGHT: 20pt&#59; PADDING-BOTTOM: 0cm&#59; PADDING-LEFT: 5.4pt&#59; PADDING-RIGHT: 5.4pt&#59; PADDING-TOP: 0cm&#59; mso-border-left-alt: solid windowtext 1.0pt&quot; width=&quot;126&quot;&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;p align=&quot;center&quot; style=&quot;LINE-HEIGHT: 110%&quot;&gt;&lt;font face=&quot;宋体&quot; size=&quot;2&quot;&gt;&lt;span style=&quot;mso-bidi-font-size: 10.0pt&#59; mso-ascii-font-family: Times New Roman&#59; mso-hansi-font-family: Times New Roman&quot;&gt;特殊需要保护的设备&lt;/span&gt;&lt;span lang=&quot;EN-US&quot; style=&quot;mso-bidi-font-size: 10.0pt&quot;&gt;&lt;O:P&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;/O:P&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;/span&gt;&lt;/font&gt;&lt;/p&gt; &nbsp; &nbsp; &nbsp; &nbsp;&lt;/td&gt; &nbsp; &nbsp; &nbsp;&lt;/tr&gt; &nbsp; &nbsp; &nbsp;&lt;tr style=&quot;HEIGHT: 20pt&quot;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&lt;td style=&quot;BORDER-BOTTOM: windowtext 1pt solid&#59; BORDER-LEFT: medium none&#59; BORDER-RIGHT: windowtext 1pt solid&#59; BORDER-TOP: medium none&#59; HEIGHT: 20pt&#59; PADDING-BOTTOM: 0cm&#59; PADDING-LEFT: 5.4pt&#59; PADDING-RIGHT: 5.4pt&#59; PADDING-TOP: 0cm&#59; mso-border-top-alt: solid windowtext 1.0pt&quot; width=&quot;110&quot;&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;p align=&quot;center&quot; style=&quot;LINE-HEIGHT: 110%&quot;&gt;&lt;font face=&quot;宋体&quot; size=&quot;2&quot;&gt;&lt;span style=&quot;mso-bidi-font-size: 10.0pt&#59; mso-ascii-font-family: Times New Roman&#59; mso-hansi-font-family: Times New Roman&quot;&gt;耐冲击过&lt;/span&gt;&lt;span lang=&quot;EN-US&quot; style=&quot;mso-bidi-font-size: 10.0pt&quot;&gt;&lt;O:P&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;/O:P&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;/span&gt;&lt;/font&gt;&lt;/p&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;p align=&quot;center&quot; style=&quot;LINE-HEIGHT: 110%&quot;&gt;&lt;font face=&quot;宋体&quot; size=&quot;2&quot;&gt;&lt;span style=&quot;mso-bidi-font-size: 10.0pt&#59; mso-ascii-font-family: Times New Roman&#59; mso-hansi-font-family: Times New Roman&quot;&gt;电压类别&lt;/span&gt;&lt;span lang=&quot;EN-US&quot; style=&quot;mso-bidi-font-size: 10.0pt&quot;&gt;&lt;O:P&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;/O:P&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;/span&gt;&lt;/font&gt;&lt;/p&gt; &nbsp; &nbsp; &nbsp; &nbsp;&lt;/td&gt; &nbsp; &nbsp; &nbsp; &nbsp;&lt;td style=&quot;BORDER-BOTTOM: windowtext 1pt solid&#59; BORDER-LEFT: medium none&#59; BORDER-RIGHT: windowtext 1pt solid&#59; BORDER-TOP: medium none&#59; HEIGHT: 20pt&#59; PADDING-BOTTOM: 0cm&#59; PADDING-LEFT: 5.4pt&#59; PADDING-RIGHT: 5.4pt&#59; PADDING-TOP: 0cm&#59; mso-border-left-alt: solid windowtext 1.0pt&#59; mso-border-top-alt: solid windowtext 1.0pt&quot; width=&quot;110&quot;&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;p align=&quot;center&quot; style=&quot;LINE-HEIGHT: 110%&quot;&gt;&lt;font face=&quot;宋体&quot; size=&quot;2&quot;&gt;&lt;span style=&quot;mso-bidi-font-size: 10.0pt&#59; mso-ascii-font-family: Times New Roman&#59; mso-hansi-font-family: Times New Roman&quot;&gt;Ⅳ类&lt;/span&gt;&lt;span lang=&quot;EN-US&quot; style=&quot;mso-bidi-font-size: 10.0pt&quot;&gt;&lt;O:P&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;/O:P&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;/span&gt;&lt;/font&gt;&lt;/p&gt; &nbsp; &nbsp; &nbsp; &nbsp;&lt;/td&gt; &nbsp; &nbsp; &nbsp; &nbsp;&lt;td style=&quot;BORDER-BOTTOM: windowtext 1pt solid&#59; BORDER-LEFT: medium none&#59; BORDER-RIGHT: windowtext 1pt solid&#59; BORDER-TOP: medium none&#59; HEIGHT: 20pt&#59; PADDING-BOTTOM: 0cm&#59; PADDING-LEFT: 5.4pt&#59; PADDING-RIGHT: 5.4pt&#59; PADDING-TOP: 0cm&#59; mso-border-left-alt: solid windowtext 1.0pt&#59; mso-border-top-alt: solid windowtext 1.0pt&quot; width=&quot;110&quot;&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;p align=&quot;center&quot; style=&quot;LINE-HEIGHT: 110%&quot;&gt;&lt;font face=&quot;宋体&quot; size=&quot;2&quot;&gt;&lt;span style=&quot;mso-bidi-font-size: 10.0pt&#59; mso-ascii-font-family: Times New Roman&#59; mso-hansi-font-family: Times New Roman&quot;&gt;Ⅲ类&lt;/span&gt;&lt;span lang=&quot;EN-US&quot; style=&quot;mso-bidi-font-size: 10.0pt&quot;&gt;&lt;O:P&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;/O:P&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;/span&gt;&lt;/font&gt;&lt;/p&gt; &nbsp; &nbsp; &nbsp; &nbsp;&lt;/td&gt; &nbsp; &nbsp; &nbsp; &nbsp;&lt;td style=&quot;BORDER-BOTTOM: windowtext 1pt solid&#59; BORDER-LEFT: medium none&#59; BORDER-RIGHT: windowtext 1pt solid&#59; BORDER-TOP: medium none&#59; HEIGHT: 20pt&#59; PADDING-BOTTOM: 0cm&#59; PADDING-LEFT: 5.4pt&#59; PADDING-RIGHT: 5.4pt&#59; PADDING-TOP: 0cm&#59; mso-border-left-alt: solid windowtext 1.0pt&#59; mso-border-top-alt: solid windowtext 1.0pt&quot; width=&quot;94&quot;&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;p align=&quot;center&quot; style=&quot;LINE-HEIGHT: 110%&quot;&gt;&lt;font face=&quot;宋体&quot; size=&quot;2&quot;&gt;&lt;span style=&quot;mso-bidi-font-size: 10.0pt&#59; mso-ascii-font-family: Times New Roman&#59; mso-hansi-font-family: Times New Roman&quot;&gt;Ⅱ类&lt;/span&gt;&lt;span lang=&quot;EN-US&quot; style=&quot;mso-bidi-font-size: 10.0pt&quot;&gt;&lt;O:P&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;/O:P&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;/span&gt;&lt;/font&gt;&lt;/p&gt; &nbsp; &nbsp; &nbsp; &nbsp;&lt;/td&gt; &nbsp; &nbsp; &nbsp; &nbsp;&lt;td style=&quot;BORDER-BOTTOM: windowtext 1pt solid&#59; BORDER-LEFT: medium none&#59; BORDER-RIGHT: medium none&#59; BORDER-TOP: medium none&#59; HEIGHT: 20pt&#59; PADDING-BOTTOM: 0cm&#59; PADDING-LEFT: 5.4pt&#59; PADDING-RIGHT: 5.4pt&#59; PADDING-TOP: 0cm&#59; mso-border-left-alt: solid windowtext 1.0pt&#59; mso-border-top-alt: solid windowtext 1.0pt&quot; width=&quot;126&quot;&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;p align=&quot;center&quot; style=&quot;LINE-HEIGHT: 110%&quot;&gt;&lt;font face=&quot;宋体&quot; size=&quot;2&quot;&gt;&lt;span style=&quot;mso-bidi-font-size: 10.0pt&#59; mso-ascii-font-family: Times New Roman&#59; mso-hansi-font-family: Times New Roman&quot;&gt;Ⅰ类&lt;/span&gt;&lt;span lang=&quot;EN-US&quot; style=&quot;mso-bidi-font-size: 10.0pt&quot;&gt;&lt;O:P&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;/O:P&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;/span&gt;&lt;/font&gt;&lt;/p&gt; &nbsp; &nbsp; &nbsp; &nbsp;&lt;/td&gt; &nbsp; &nbsp; &nbsp;&lt;/tr&gt; &nbsp; &nbsp; &nbsp;&lt;tr style=&quot;HEIGHT: 20pt&quot;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&lt;td style=&quot;BORDER-BOTTOM: windowtext 1pt solid&#59; BORDER-LEFT: medium none&#59; BORDER-RIGHT: windowtext 1pt solid&#59; BORDER-TOP: medium none&#59; HEIGHT: 20pt&#59; PADDING-BOTTOM: 0cm&#59; PADDING-LEFT: 5.4pt&#59; PADDING-RIGHT: 5.4pt&#59; PADDING-TOP: 0cm&#59; mso-border-top-alt: solid windowtext 1.0pt&quot; width=&quot;110&quot;&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;p align=&quot;center&quot; style=&quot;LINE-HEIGHT: 110%&quot;&gt;&lt;font face=&quot;宋体&quot; size=&quot;2&quot;&gt;&lt;span style=&quot;mso-bidi-font-size: 10.0pt&#59; mso-ascii-font-family: Times New Roman&#59; mso-hansi-font-family: Times New Roman&quot;&gt;耐冲击电压额定值（&lt;/span&gt;&lt;span lang=&quot;EN-US&quot; style=&quot;mso-bidi-font-size: 10.0pt&quot;&gt;kV&lt;/span&gt;&lt;span style=&quot;mso-bidi-font-size: 10.0pt&#59; mso-ascii-font-family: Times New Roman&#59; mso-hansi-font-family: Times New Roman&quot;&gt;）&lt;/span&gt;&lt;span lang=&quot;EN-US&quot; style=&quot;mso-bidi-font-size: 10.0pt&quot;&gt;&lt;O:P&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;/O:P&gt; &nbsp; &nbsp; &nbsp; &nbsp; 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BORDER-LEFT: medium none&#59; BORDER-RIGHT: windowtext 1pt solid&#59; BORDER-TOP: medium none&#59; HEIGHT: 20pt&#59; PADDING-BOTTOM: 0cm&#59; PADDING-LEFT: 5.4pt&#59; PADDING-RIGHT: 5.4pt&#59; PADDING-TOP: 0cm&#59; mso-border-left-alt: solid windowtext 1.0pt&#59; mso-border-top-alt: solid windowtext 1.0pt&quot; width=&quot;110&quot;&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;p align=&quot;center&quot; style=&quot;LINE-HEIGHT: 110%&quot;&gt;&lt;font face=&quot;宋体&quot; size=&quot;2&quot;&gt;&lt;span lang=&quot;EN-US&quot; style=&quot;mso-bidi-font-size: 10.0pt&quot;&gt;4&lt;O:P&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;/O:P&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;/span&gt;&lt;/font&gt;&lt;/p&gt; &nbsp; &nbsp; &nbsp; &nbsp;&lt;/td&gt; &nbsp; &nbsp; &nbsp; &nbsp;&lt;td style=&quot;BORDER-BOTTOM: windowtext 1pt solid&#59; BORDER-LEFT: medium none&#59; BORDER-RIGHT: windowtext 1pt solid&#59; BORDER-TOP: medium none&#59; HEIGHT: 20pt&#59; PADDING-BOTTOM: 0cm&#59; PADDING-LEFT: 5.4pt&#59; PADDING-RIGHT: 5.4pt&#59; PADDING-TOP: 0cm&#59; mso-border-left-alt: solid windowtext 1.0pt&#59; mso-border-top-alt: solid windowtext 1.0pt&quot; width=&quot;94&quot;&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;p align=&quot;center&quot; style=&quot;LINE-HEIGHT: 110%&quot;&gt;&lt;font face=&quot;宋体&quot; size=&quot;2&quot;&gt;&lt;span lang=&quot;EN-US&quot; style=&quot;mso-bidi-font-size: 10.0pt&quot;&gt;2.5&lt;O:P&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;/O:P&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;/span&gt;&lt;/font&gt;&lt;/p&gt; &nbsp; &nbsp; &nbsp; &nbsp;&lt;/td&gt; &nbsp; &nbsp; &nbsp; &nbsp;&lt;td style=&quot;BORDER-BOTTOM: windowtext 1pt solid&#59; BORDER-LEFT: medium none&#59; BORDER-RIGHT: medium none&#59; BORDER-TOP: medium none&#59; HEIGHT: 20pt&#59; PADDING-BOTTOM: 0cm&#59; PADDING-LEFT: 5.4pt&#59; PADDING-RIGHT: 5.4pt&#59; PADDING-TOP: 0cm&#59; mso-border-left-alt: solid windowtext 1.0pt&#59; mso-border-top-alt: solid windowtext 1.0pt&quot; width=&quot;126&quot;&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;p align=&quot;center&quot; style=&quot;LINE-HEIGHT: 110%&quot;&gt;&lt;font face=&quot;宋体&quot; size=&quot;2&quot;&gt;&lt;span lang=&quot;EN-US&quot; style=&quot;mso-bidi-font-size: 10.0pt&quot;&gt;1.5&lt;O:P&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;/O:P&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;/span&gt;&lt;/font&gt;&lt;/p&gt; &nbsp; &nbsp; &nbsp; &nbsp;&lt;/td&gt; &nbsp; &nbsp; &nbsp;&lt;/tr&gt; &nbsp; &nbsp;&lt;/tbody&gt; &nbsp;&lt;/table&gt;&lt;/div&gt;&lt;p align=&quot;left&quot;&gt;&lt;font size=&quot;2&quot;&gt;注：Ⅰ类──需要将瞬态过电压限制到特定水平的设备；&lt;br&gt;　　Ⅱ类──如家用电器、手提工具和类似负荷；&lt;br&gt;　　Ⅲ类──如配电盘，断路器，包括电缆、母线、分线盒、开关、插座的布线系统，以及应用于工业的设备和永久接至固定装置的固定安装的电动机等一些其他设备；&lt;br&gt;　　Ⅳ类──如电气计量仪表、一次线过流保护设备、波纹控制设备。&lt;br&gt;&lt;br&gt;　　[说明] &nbsp;在第二段中“为使最大电涌电压足够低，其两端的引线应做到最短”。见图6.6中的a、b图所示。当引线长，产生的电压大，可能时，也可采用图中的c、d图接线。 &lt;br&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &lt;br&gt;&lt;img src=&quot;http://asp.cn/img/50057/gb50057-94_t644-1.jpg&quot; width=&quot;492&quot; height=&quot;309&quot;&gt;&lt;br&gt;&lt;br&gt;图6.4.4-1 &nbsp; &nbsp;SPD连接引线的影响 &lt;br&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &lt;br&gt;第6.4.5条 &nbsp;选择 220/380V 三相系统中的电涌保护器时，其最大持续运行电压 Uc 应符合下列规定。&lt;br&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;　　一、按图6.4.5-1接线的 TT 系统中，Uc 不应小于 1.55Uo。&lt;br&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;　　二、按图6.4.5-2和图6.4.5-3接线的 TN 和 TT 系统中，Uc 不应小于 1.15Uo。&lt;br&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;　　三、按图6.4.5-4接线的 IT 系统中 Uc 不应小于1.15U（U 为线间电压）。&lt;br&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;br&gt;注：Uo是低压系统相线对中性线的标称电压，在 220/380V 三相系统中，Uo=220V。 &lt;br&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &lt;br&gt;&lt;img src=&quot;http://asp.cn/img/50057/gb50057-94_t645-1.jpg&quot; width=&quot;425&quot; height=&quot;376&quot;&gt;&lt;br&gt;1──装置的电源；&lt;br&gt;　　　　　2──配电盘；&lt;br&gt;　　　　　3──总接地端或总接地连接带；&lt;br&gt;　　　　　4──电涌保护器（SPD）；&lt;br&gt;　　　　　5──电涌保护器的接地连接，5a 或5 b；&lt;br&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;　　　　　6──需要保护的设备；&lt;br&gt;　　　　　7──剩余电流保护器，应考虑通雷电流的能力；&lt;br&gt;　　　　　F──保护电涌保护器推荐的熔丝、断路器或剩余电流保护器；&lt;br&gt;　　　　　RA──本装置的接地电阻；&lt;br&gt;　　　　　RB──供电系统的接地电阻； &lt;br&gt;&lt;br&gt;&lt;img src=&quot;http://asp.cn/img/50057/gb50057-94_t645-2.jpg&quot; width=&quot;497&quot; height=&quot;364&quot;&gt;&lt;br&gt;&lt;br&gt;1──装置的电源；&lt;br&gt;　　　　　2──配电盘；&lt;br&gt;　　　　　3──总接地端或总接地连接带；&lt;br&gt;　　　　　4──电涌保护器（SPD）；&lt;br&gt;　　　　　5──电涌保护器的接地连接，5a 或 5b；&lt;br&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;　　　　　6──需要保护的设备；&lt;br&gt;　　　　　7──PE与N线的连接带；&lt;br&gt;　　　　　F──保护电涌保护器推荐的熔丝、断路器或剩余电流保护器；&lt;br&gt;　　　　　RA──本装置的接地电阻；&lt;br&gt;　　　　　RB──供电系统的接地电阻； &lt;br&gt;&lt;br&gt;注：当采用 TN-C-S 或 TN-S 系统时，在 N 与 PE 线连接处电涌保护器用三个，在其以后 N 与 PE 线分开处安装电涌保护器时用四个，即在N与PE线间增加一个，类似于图6.4.5-1。 &lt;br&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &lt;img src=&quot;http://asp.cn/img/50057/gb50057-94_t645-3.jpg&quot; width=&quot;481&quot; height=&quot;360&quot;&gt;&lt;br&gt;1──装置的电源；&lt;br&gt;　　　　　2──配电盘；&lt;br&gt;　　　　　3──总接地端或总接地连接带；&lt;br&gt;　　　　　4──电涌保护器（SPD）；&lt;br&gt;　　　　　4a──电涌保护器或放电间隙；&lt;br&gt;　　　　　5──电涌保护器的接地连接，5a或5b；&lt;br&gt;　　　　　6──需要保护的设备； &lt;br&gt;　　　　　7──剩余电流保护器，可位于母线的上方或下方；&lt;br&gt;　　　　　F──保护电涌保护器推荐的熔丝、断路器或剩余电流保护器；&lt;br&gt;　　　　　RA──本装置的接地电阻；&lt;br&gt;　　　　　RB──供电系统的接地电阻； &lt;br&gt;&lt;br&gt;注：当电源变压器高压侧碰外壳短路产生的过电压加于 4a 设备时不应动作。在高压系统采用低电阻接地和供电变压器外壳、低压系统中性点合用同一接地装置以及切断短路的时间小于或等于 5s 时，该过电压可按 1200V 考虑。 &lt;br&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &lt;img src=&quot;http://asp.cn/img/50057/gb50057-94_t645-4.jpg&quot; width=&quot;511&quot; height=&quot;347&quot;&gt;&lt;br&gt;1──装置的电源；&lt;br&gt;　　　　　2──配电盘；&lt;br&gt;　　　　　3──总接地端或总接地连接带；&lt;br&gt;　　　　　4──电涌保护器（SPD）；&lt;br&gt;　　　　　5──电涌保护器的接地连接，5a 或 5b；&lt;br&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;　　　　　6──需要保护的设备；&lt;br&gt;　　　　　7──剩余电流保护器；&lt;br&gt;　　　　　F──保护电涌保护器推荐的熔丝、断路器或剩余电流保护器；&lt;br&gt;　　　　　RA──本装置的接地电阻；&lt;br&gt;　　　　　RB──供电系统的接地电阻； &lt;br&gt;&lt;br&gt;[说明] &nbsp;系数 1.15 中 0.1 考虑系统的电压偏差，0.05 考虑电涌保护器的老化。 &lt;br&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &lt;br&gt;第6.4.6条 &nbsp;在供电的电压偏差超过所规定的 10% 以及谐波使电压幅值加大的场所，应根据具体情况对氧化锌压敏电阻 SPD 提高本章第6.4.5条所规定的 Uc 值。&lt;br&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;　　[说明] &nbsp;Uc 值与产品的使用寿命、电压保护水平有关。Uc 选高了，寿命长了，但电压保护水平，即 SPD 的残压也相应提高。要综合考虑。&lt;br&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;　　第6.4.7条 &nbsp;在 LPZ0A 或 LPZ0B 区与 LPZ1 区交界处，在从室外引来的线路上安装的 SPD，应选用符合 I 级分类试验的产品。&lt;br&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;　　应按本章第6.3.4条的规定确定通过 SPD 的 10/350μs 雷电流幅值。当线路有屏蔽时，通过每个 SPD 的雷电流可按上述确定的雷电流的 30% 考虑。SPD 宜靠近屏蔽线路末端安装。以上述得出的雷电流作为 Ipeak 来选用 SPD。&lt;br&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;　　当按上述要求选用配电线路上的 SPD 时，其标称放电电流 In 不宜小于 15kA。&lt;br&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;　　[说明] &nbsp;现举一例说明如何在 LPZ0A 或 LPZ0B 区与 LPZ1 区交界处选用所安装的 SPD。&lt;br&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;　　一建筑物属于第二类防雷建筑物，从室外引入水管、电力线、信息线。电力线为 TN-C-S，在入口于界面处在电力线路的总配电箱上装设三台 SPD，在此以后改为 TN-S 系统。&lt;br&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;　　因为是第二类防雷建筑物，按附表6.1 和附表6.2，雷电流幅值分别为 150kA 和 37.5kA，波头时间分别为 10μs 和 0.25μs。&lt;br&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;　　按图6.3.4-1得 ii1 = 150/2/3 = 25kA 和 ii2 = 37.5/2/3 = 6.25kA。&lt;br&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;　　每个 SPD 通过得电流为 iV1 = 25/3=8.3kA 和 iV2 = 6.25/3 =2.1kA。&lt;br&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;　　所以，选用I级分类试验的 SPD 时，其 Ipeak＞8.3kA（10/350μs）。&lt;br&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;　　当电力线有屏蔽层时，所选用的I级分类试验的 SPD，其 Ipeak＞0.3×8.3kA = 2.5kA。&lt;br&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;　　对 I 级分类试验的 SPD，在其电压保护水平为4kV的情况下，当 SPD 上、下引线长度为 1m 时（电感为1μH/m），电流最大平均陡度为 iV2 /T1= 2.1×0.25 = 8.4kA/μs（线路无屏蔽层）和 iV2 /T1=0.3×2.1/0.25=2.52kA/μs（线路有屏蔽层）。&lt;br&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;　　因此，最大电涌电压（图6.6中a图A、B之间的电压）为 UAB=4kV+8.4×1=12.4kV（无屏蔽层）和 U＇AB = 4kV+2.52×1 = 6.52kV（有屏蔽层）。 &lt;br&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 　　第6.4.8条 &nbsp;在按本章第6.4.7条要求安装的 SPD 所得到的电压保护水平加上其两端引线的感应电压以及反射波效应不足以保护距其较远处的被保护设备的情况下，尚应在被保护设备处装设 SPD，其标称放电电流 In 不宜小于 8/20μs3kA。&lt;br&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;　　当被保护设备沿线路距本章第6.4.7条要求安装的 SPD 不大于 10m 时，若该 SPD 的电压保护水平加上其两端引线的感应电压小于被保护设备耐压水平的 80%，一般情况在被保护设备处可不装 SPD。&lt;br&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;　　[说明] &nbsp;SPD两端引线的电压见第6.4.7条说明。根据被保护设备的特性（如高电阻型、电容型）或开路时，反射波效应最大可将侵入的电涌电压加倍。&lt;br&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;　　80%是考虑多种安全因素的系数。&lt;br&gt;　　第6.4.9条 &nbsp;当本章第6.4.7条和第6.4.8条要求安装的 SPD 之间设有配电盘时，若第一级 SPD 的电压保护水平加上其两端引线的感应电压保护不了该配电盘内的设备，应在该盘内安装第二级SPD，其标称放电电流不宜小于 8/20μs，5kA。&lt;br&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;　　第6.4.10条 &nbsp;在考虑各设备之间的电压保护水平时，若线路无屏蔽尚应计及线路的感应电压，应按附录七计算，雷电流参量应按附表6.2 选取。在考虑被保护设备的耐压水平时宜按其值的 80% 考虑。&lt;br&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;　　第6.4.11条 &nbsp;在一般情况下，当在线路上多处安装 SPD 且无准确数据时，电压开关型 SPD 与限压型 SPD 之间的线路长度不宜小于 10m，限压型 SPD 之间的线路长度不宜小于 5m。&lt;br&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;　　第6.4.12条 &nbsp;在一般情况下，仅对表6.4.4中的 I、II 类设备宜考虑采取防操作过电压的措施。&lt;br&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;　　[说明] &nbsp;根据 IEC60364-4-443：1995（防大气和操作过电压）的以下内容编写的。其443.3条注2：“在大多数情况下，不需要考虑控制操作过电压，因为统计所测量的数值得出的评价是，操作过电压高于表6.4.4II类耐压水平的危险度是低的”。&lt;br&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;　　注：保护信息线路和设备的 SPD 另按国家有关规定确定。

查看完整版本: [转帖]《建筑物防雷设计规范》GB50057-94 2000 年局部修订 6.4