ttxs 发表于 2008-10-10 16:59:20

电源线路SPD的选择要求

<p class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><font size=3><font color=#000000><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">电源线路</span><span lang=EN-US><font face="Times New Roman">SPD</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">的选择要求</span></font></font></p><p class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><span lang=EN-US><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p><font face="Times New Roman" color=#000000 size=3>&nbsp;</font></o:p></span></p><p class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><font size=3><font color=#000000><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">（一）</span><span lang=EN-US><font face="Times New Roman">SPD</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">的选择</span></font></font></p><p class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><span lang=EN-US><o:p><font face="Times New Roman" color=#000000 size=3>&nbsp;</font></o:p></span></p><p class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><font size=3><font color=#000000><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">　　</span><span lang=EN-US><font face="Times New Roman">1</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">、保护系统中安装</span><span lang=EN-US><font face="Times New Roman">SPD</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">的数量，依据雷电防护区概念的要求，被保护设备的抗扰能力和雷电防护分级而定。</span></font></font></p><p class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><span lang=EN-US><o:p><font face="Times New Roman" color=#000000 size=3>&nbsp;</font></o:p></span></p><p class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><font size=3><font color=#000000><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">　　</span><span lang=EN-US><font face="Times New Roman">2</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">、在</span><span lang=EN-US><font face="Times New Roman">LPZ0</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">区与</span><span lang=EN-US><font face="Times New Roman">LPZ1</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">区交界处应安装Ⅰ级分类实验的</span><span lang=EN-US><font face="Times New Roman">SPD</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">或限压型</span><span lang=EN-US><font face="Times New Roman">SPD</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">作为第一级保护；在</span><span lang=EN-US><font face="Times New Roman">LPZ1</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">区与</span><span lang=EN-US><font face="Times New Roman">LPZ2</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">区交界处应安装限压型</span><span lang=EN-US><font face="Times New Roman">SPD</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">作为第二级保护；在住宅配电箱输出端应安装限压型</span><span lang=EN-US><font face="Times New Roman">SPD</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">作为第三级保护。</span></font></font></p><p class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><span lang=EN-US><o:p><font face="Times New Roman" color=#000000 size=3>&nbsp;</font></o:p></span></p><p class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><font size=3><font color=#000000><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">　　</span><span lang=EN-US><font face="Times New Roman">3</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">、</span><span lang=EN-US><font face="Times New Roman">SPD</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">连接导线应短而直，其长度不宜大于</span><span lang=EN-US><font face="Times New Roman">0.5m</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">。如果电网中有几个浪涌保护器，它们将会互相影响，并联的保护器之间必须达到能量的配合才能确保被保护线路的安全。配合的效果是：当由雷电形成一个浪涌过电压时，电涌保护器（</span><span lang=EN-US><font face="Times New Roman">B</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">级）将可靠地响应，带走高能量的电流，以保护由于过载而损坏其它浪涌保护器（</span><span lang=EN-US><font face="Times New Roman">C</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">级或</span><span lang=EN-US><font face="Times New Roman">D</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">级）。当</span><span lang=EN-US><font face="Times New Roman">SPD</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">具有能量自动配合功能时，线路长度不受上述规定限制。为防止</span><span lang=EN-US><font face="Times New Roman">SPD</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">老化造成短路，</span><span lang=EN-US><font face="Times New Roman">SPD</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">安装线路上应有过电流保护装置，宜选用有劣化显示功能的</span><span lang=EN-US><font face="Times New Roman">SPD</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">。</span></font></font></p><p class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><span lang=EN-US><o:p><font face="Times New Roman" color=#000000 size=3>&nbsp;</font></o:p></span></p><p class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><font size=3><font color=#000000><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">　　4、</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">在电源总配电柜输出端应安装标称放电电流</span><span lang=EN-US><font face="Times New Roman">In</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">≥</span><span lang=EN-US><font face="Times New Roman">15KA</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">（</span><span lang=EN-US><font face="Times New Roman">10/350</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">μ</span><span lang=EN-US><font face="Times New Roman">s</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">波形）的开关型浪涌保护器；也可安装标称放电电流</span><span lang=EN-US><font face="Times New Roman">In</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">≥</span><span lang=EN-US><font face="Times New Roman">80KA</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">（</span><span lang=EN-US><font face="Times New Roman">8/20</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">μ</span><span lang=EN-US><font face="Times New Roman">s</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">波形）的限压型</span><span lang=EN-US><font face="Times New Roman">SPD</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">作为一级防护。</span></font></font></p><p class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><span lang=EN-US><o:p><font face="Times New Roman" color=#000000 size=3>&nbsp;</font></o:p></span></p><p class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><font size=3><font color=#000000><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">　<span style="COLOR: red">　<font color=#000000>5、</font></span></span></font><font color=#000000><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">在分配电柜输出端应安装标称放电电流</span><span lang=EN-US><font face="Times New Roman">In</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">≥</span><span lang=EN-US><font face="Times New Roman">40KA</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">（</span><span lang=EN-US><font face="Times New Roman">8/20</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">μ</span><span lang=EN-US><font face="Times New Roman">s</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">波形）的限压型</span><span lang=EN-US><font face="Times New Roman">SPD</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">作为二级防护。</span></font></font></p><p class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><span lang=EN-US><o:p><font face="Times New Roman" color=#000000 size=3>&nbsp;</font></o:p></span></p><p class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><font size=3><font color=#000000><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">　　<font color=#000000>6、</font></span></font><font color=#000000><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">在住宅终端配电箱输出端应安装标称放电电流</span><span lang=EN-US><font face="Times New Roman">In</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">≥</span><span lang=EN-US><font face="Times New Roman">20KA</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">（</span><span lang=EN-US><font face="Times New Roman">8/20</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">μ</span><span lang=EN-US><font face="Times New Roman">s</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">波形）限压型</span><span lang=EN-US><font face="Times New Roman">SPD</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">作为三级防护。</span></font></font></p><p class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><span lang=EN-US><o:p><font face="Times New Roman" color=#000000 size=3>&nbsp;</font></o:p></span></p><p class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><font size=3><font color=#000000><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">　&nbsp; 7、</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">在配电箱输出端也可安装混合型或串联型</span><span lang=EN-US><font face="Times New Roman">SPD</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">，其技术指标应满足设备要求。</span></font></font></p><p class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><span lang=EN-US><o:p><font face="Times New Roman" color=#000000 size=3>&nbsp;</font></o:p></span></p><p class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><font size=3><font color=#000000><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">（二）</span><span lang=EN-US><font face="Times New Roman">SPD</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">后备保护元件的选择。</span></font></font></p><p class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><span lang=EN-US><o:p><font face="Times New Roman" color=#000000 size=3>&nbsp;</font></o:p></span></p><p class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><font size=3><font color=#000000><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">　　基于电气安全原因，并联安装在市电电源的</span><span lang=EN-US><font face="Times New Roman">SPD</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">，为防止其失效后造成故障短路，必需在</span><span lang=EN-US><font face="Times New Roman">SDP</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">前安装短路保护器件。</span><span lang=EN-US><font face="Times New Roman">SPD</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">的后备保护有熔断器、断路器和漏电断路器三种。</span></font></font></p><p class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><span lang=EN-US><o:p><font face="Times New Roman" color=#000000 size=3>&nbsp;</font></o:p></span></p><p class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><font size=3><font color=#000000><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">　　在国内外公司</span><span lang=EN-US><font face="Times New Roman">SPD</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">的样本中，对</span><span lang=EN-US><font face="Times New Roman">SPD</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">后备保护的推荐方案比较乱，没有统一的标准可遵循。国内某公司使用手册中推荐的熔断器规格如下：</span></font></font></p><p class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><span lang=EN-US><o:p><font face="Times New Roman" color=#000000 size=3>&nbsp;</font></o:p></span></p><p class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><font size=3><font color=#000000><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">　　第一级</span><span lang=EN-US><font face="Times New Roman">SPD</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">为开关型</span><span lang=EN-US><font face="Times New Roman">15kA</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">，</span><span lang=EN-US><font face="Times New Roman">10/350</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">，断路器为</span><span lang=EN-US><font face="Times New Roman">63A</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">；</span></font></font></p><p class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><span lang=EN-US><o:p><font face="Times New Roman" color=#000000 size=3>&nbsp;</font></o:p></span></p><p class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><font size=3><font color=#000000><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">　　第二级</span><span lang=EN-US><font face="Times New Roman">SPD</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">为限压型</span><span lang=EN-US><font face="Times New Roman">40kA</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">，</span><span lang=EN-US><font face="Times New Roman">8/20</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">，断路器为</span><span lang=EN-US><font face="Times New Roman">32A</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">；</span></font></font></p><p class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><span lang=EN-US><o:p><font face="Times New Roman" color=#000000 size=3>&nbsp;</font></o:p></span></p><p class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><font size=3><font color=#000000><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">　　第三级</span><span lang=EN-US><font face="Times New Roman">SPD</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">为限压型</span><span lang=EN-US><font face="Times New Roman">10kA</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">，</span><span lang=EN-US><font face="Times New Roman">8/20</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">，断路器为</span><span lang=EN-US><font face="Times New Roman">16A</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">。</span></font></font></p><p class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><span lang=EN-US><o:p><font face="Times New Roman" color=#000000 size=3>&nbsp;</font></o:p></span></p><p class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><font size=3><font color=#000000><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">　　断路器选择</span><span lang=EN-US><font face="Times New Roman">C</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">脱扣曲线</span></font></font></p>
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查看完整版本: 电源线路SPD的选择要求