急！！！！！！！！1

一直很安静

<P>最近在画一个图 但是老师给的参考图里有电涌保护器 是SPD吧 不知道是怎么回事 哪位高手能解释一下？</P>
<P>在系统图的进线处画的 分别标的63\4P 40/4P</P>

东海龙王

YES,THEY ARE SPDs. 63KA &amp; 40 KA ARE THEIR FAULT CAPACITY. AND 4P MEAS 4 POLES. PLEASE REFER TO RELEVANT NATIONAL CODE <FONT color=#dd226d>GB50057-94.</FONT>

东海龙王

<P>SPD MEANS SURGE PROTECTIVE DEVICE. IT CAN PROTECT ELECTRICAL EQUIPMENT IN CASE OF OVERVOLTAGE IN THE CIRCUIT.</P>
<P>IF YOU HAVE SOME PROBLEMS, YOU CAN  TURN TO SUPPLIER FOR HELP.</P>

一直很安静

<P>[em34]看见您的留言我都哭了 从毕业以后还没有见过如此多的英语[em34]</P>

一直很安静

那这个大小有规定吗？还是要refer to relevant national code GB50057-94?

houxuejing

龙王好厉害，佩服佩服！现在我的英语都忘得差不多了，呵呵！

东海龙王

<DIV class=quote>以下是引用 <B>一直很安静</B></FONT> 在(<I>2008-10-1 16:47:06</I>)的发言<BR>那这个大小有规定吗？还是要refer to relevant national code GB50057-94?</DIV>
<P><BR>DON'T WORRY ABOUT THIS, MY FRIEND.</P>
<P>FIRST OF ALL, YOU SHOULD READ CHAPTER 6 OF GB50057-94. IT CAN TELL YOU SOME BASIC KNOWLEDGE.</P>
<P>THEN YOU CAN REFER TO GB18802.1-2002,(I.E. SURGE PRECTIVE DEVICES CONNECTED TO LV POWER DISTRIBUTION SYSTEM-PART 1). YOU CAN UNLOAD THE CODE FROM THIS BBS.</P>
<P>MOREOVER, YOU CAN FIND ALL PARAMETERS IN THE DESIGN HANDBOOK FOR INDUSTRIAL &amp; CIVIL POWER DISTRIBUTION. YOU CAN BUY IT FROM BOOKSTORE.</P>
<P>ALL SPD SUPPLIERS CAN GIVE YOU THEIR CATALOGS. THAT WILL HELP YOU WITH DESIGN.<BR></P>

东海龙王

<P>DESIGN HANDBOOK FOR INDUSTRIAL &amp; CIVIL POWER DISTRIBUTION</P>
<P><a href="http://www.jzdq.net.cn/bbs/Show.asp?id=2890&amp;BoardID=16&amp;TB=1" target="_blank" >http://www.jzdq.net.cn/bbs/Show.asp?id=2890&amp;BoardID=16&amp;TB=1</A></P>

东海龙王

<a href="http://www.jzdq.net.cn/bbs/Show.asp?id=2450&amp;BoardID=16&amp;TB=1" target="_blank" >http://www.jzdq.net.cn/bbs/Show.asp?id=2450&amp;BoardID=16&amp;TB=1</A>

东海龙王

<P>GB18802.1-2002</P>
<P><a href="http://www.jzdq.net.cn/bbs/Show.asp?id=1359&amp;BoardID=16&amp;TB=1" target="_blank" >http://www.jzdq.net.cn/bbs/Show.asp?id=1359&amp;BoardID=16&amp;TB=1</A></P>

mzlele

龙王疯了，鉴定完毕！

关东武夫

有这种型号的SPD吗？按最大涌流，ABB的OVRBT23N－70－440SP是70kA啊，63的是国产的？进线处N和PE还是相当的靠近的话应该用3P的吧。楼主的那2个是断路器吧。我糊涂了